Relevant bibliographies by topics / Water - Purification - Dissolved air flotation

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Academic literature on the topic 'Water - Purification - Dissolved air flotation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Water - Purification - Dissolved air flotation"

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Es'kin, Anton Andreevich, Nadezhda Sergeevna Tkach, and Marina Sergeevna Lyagusha. "PURIFICATION OF OILY WATER BY DISSOLVED AIR FLOTATION WITH SPRAYING OF LIQUID." NEWS OF HIGHER EDUCATIONAL INSTITUTIONS. CONSTRUCTION 709, no. 1 (2018): 47–56. http://dx.doi.org/10.32683/0556-1052-2018-709-1-47-56.

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Tian, Zhuang, Can Wang, and Min Ji. "Full-scale dissolved air flotation (DAF) equipment for emergency treatment of eutrophic water." Water Science and Technology 77, no. 7 (February 23, 2018): 1802–9. http://dx.doi.org/10.2166/wst.2018.046.

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Abstract Eutrophication of urban rivers has caused severe environmental problems due to the pollution from point and diffuse sources. Although eutrophication can be alleviated by reducing the input to the river system, fast-treating terminal control technologies, especially under emergent situations, should be developed to reduce risks induced by eutrophication. The present study developed an emergency purification device based on dissolved air flotation (DAF) technology. After equipment commissioning and parameter optimization for applications in the field of engineering, the device was found to effectively remove total phosphorus, chlorophyll a, chemical oxygen demand, and turbidity in water by controlling the coagulant dosage and adjusting the gas-liquid mixing pump parameters. Dissolved air in water could enhance dissolved oxygen, and dissolved oxygen in polluted rivers could be raised from 0.2–2 mg/L to 3–3.5 mg/L. Removal of total nitrogen was poor because the majority of nitrogen contents were dissolved. Finally, DAF has been proven to be a promising technology due to its ease of implementation, low equipment investment requirement, and low operation cost.
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Mohd Arif Zainol, Mohd Remy Rozainy, Hasif Mokhtar, Syafalni Sutan, Khairy Abdul Wahab, and Mohd Mustafa Al Bakri Abdullah. "Chitosan and Bentonite as Coagulant in Dissolved Air Flotation Tank." Applied Mechanics and Materials 754-755 (April 2015): 728–32. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.728.

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The use of monocoagulants, such as Chitosan, may not be a good solution for highly turbid water purification because of its high cost. The possibility to reduce the amount of the primary coagulant at the same time keeping the removal to be in optimum may be a good strategy to reduce the operation cost. There might be another coagulant aid for example the natural clay of Bentonite to reduce the cost. The initial stage is to determine the Bentonite dosage and mixture ratio to be used with Chitosan. Coagulation of Chitosan-Bentonite had successfully removed the turbidity with the efficiency of 97%. The coagulants performed well when Chitosan-Bentonite ratio is 30:70 at concentration of 1000mg/l
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Zasadowski, Dariusz, Anders Strand, Anna Sundberg, Håkan Edlund, and Magnus Norgren. "Selective purification of bleached spruce TMP process water by induced air flotation (IAF)." Holzforschung 68, no. 2 (February 1, 2014): 157–65. http://dx.doi.org/10.1515/hf-2013-0045.

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Abstract The environmentally benign closure of water systems in paper mills leads to the problem of accumulation of dissolved and colloidal wood substances (DCS) in process water. Notably, pitch affects the pulp and paper production negatively and increases the demand for additional treatment of the process water. In the present article, the purification of thermomechanical pulping process water from the alkaline peroxide bleaching stage has been investigated, with the induced air flotation (IAF) in focus. The following parameters were considered concerning the IAF efficiency to remove detrimental substances: concentration of cationic foaming agent, pH value, calcium concentration, and temperature. The amounts and characteristics of residual DCS were determined by gas chromatography and turbidity measurements. Residual concentrations of the foaming agent dodecyltrimetylammonium chloride were determined by electrospray ionization mass spectrometry. Up to 90% of pitch was removed, whereas hemicelluloses, which are important in preventing pitch problems, remained in the waters. Up to 70% of the pectic acids accounted for the high cationic demand of the process waters were removed by optimization of the IAF parameters. The presented separation process gives new opportunities to a selective purification of the process waters.
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Wang, Yong Lei, Jun Li, Ke Feng Zhang, Rui Bao Jia, Mei Li, Wu Chang Song, An Shuang Wang, and Lin Wang. "The Optimization Design and Operating Characteristics of Vertical Flow Dissolved Air Flotation Carbon-Sand Dual Media Filter Flofilter." Advanced Materials Research 864-867 (December 2013): 2031–34. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.2031.

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Aimed at the raw water quality characterized by low temperature and low turbidity in winter,high algae and organic matters in summer, the vertical flow-carbon sand dual media filter flofilter was developed to research water purification effect.In the meantime,the pressurized dissolved air system and the filter unit were optimized.Air flotation and filtration were integrated in a structure,which could effectively save land area, and the device had advantages of operation mode flexible and purifying water collaboratively,etc..The results showed that the device could reach better results when the dissolved air pressure was 0.4 Mpa,the reflux ratio was 8% and the filter speed was 8 m/h. The averaged removal efficiency of turbidity,CODMn,the total number of algae and chlorophyll a were 86.49%,43.46%,76.30% and 71.26% by combination process respectively, so water purification effect was significant.
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Wang, Yong Lei, Ning Wang, Ruibao Jia, Kefeng Zhang, Baozhen Liu, Wuchang Song, and Junqi Jia. "Research on CFD numerical simulation and flow field characteristics of countercurrent–cocurrent dissolved air flotation." Water Science and Technology 77, no. 5 (January 2, 2018): 1280–92. http://dx.doi.org/10.2166/wst.2018.006.

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Abstract Countercurrent–cocurrent dissolved air flotation (CCDAF), the popular water purification device, which consists of collision and adhesion contact zones, showed favorable flotation conditions for micro-bubble adhesion and stability. In this study, computational fluid dynamics (CFD) numerical simulation was employed to confirm that the unique CCDAF configuration create reasonable and that the flow field characteristics were good no matter for single phase or gas–liquid two-phase conditions. In addition, the turbulence of the flow field was enhanced with the increasing influent load; the swirling was remarkably reduced with the increase of gas holdup. Meanwhile, a thick micro-bubble filter layer was formed in the separation zone, which favored bubble-flocs agglomerating and rising. The force analysis also showed that the cross section within the tank contribute to the uniformity of the bottom water collection as well as enlargement of the bottom outflow area, therefore improving the overall flotation performance. The simulation results revealed for the CCDAF process can provide technical guidance for engineering design and application.
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Misković, D., B. Dalmacija, Ž. Živanov, E. Karlović, Z. Hain, and S. Marić. "An Investigation of the Treatment and Recycling of Oil Refinery Wastewater." Water Science and Technology 18, no. 9 (September 1, 1986): 105–14. http://dx.doi.org/10.2166/wst.1986.0083.

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The objective of the present investigation was a high level of purification of the wastewater from an oil refinery achieved by using some improved methods yielding an effluent suitable for recycling into the process. All the investigations were carried out on a continuous laboratory pilot system consisting of the following units: dissolved air flotation (DAF), sedimentation, double-stage microbiological reactor, and adsorption columns filled with granular biologically activated carbon (GBAC). A high degree of COD reduction close to 100% (precisely, 99.95 %), as well as removal of nitrogen compounds of 72% was achieved during a relatively short retention time within the range of 15-16.5 hrs. The DAF technique combined with gravitational separation was used to achieve the recovery of free oil matter up to 98%, without any preliminary conditioning. After the sedimentation of coagulated and flocculated dispersed oils, the microbiological oxidation of dissolved matter was accomplished by using two kinds of activated sludge for easy and hard degradable organics. Using the continuously bioregenerating GBAC, an effluent having a lowered COD value to about 9 was obtained. At the same time, the denitrification process took place. According to the obtained results the treated oil refinery wastewater can be recycled into the process, or discharged into a water recipient of a low self-purifying capacity.
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Sarja, T., M. Zabihian, P. Kourunen, and J. Niinimäki. "New method for measuring potential secondary stickies in deinked pulp filtrates." Water Science and Technology 50, no. 3 (August 1, 2004): 207–15. http://dx.doi.org/10.2166/wst.2004.0197.

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Secondary stickies refer to sticky material in recycled fiber process streams, which has been dissolved in one part of process, but turned to solid phase due to changes in process conditions. The material that can later form secondary stickies is called potential secondary stickies. A new, fast, and simple method for measuring the amount of potential secondary stickies was developed to measure the purification result in the deinked pulp (DIP) filtrates. The new method, now called potential secondary stickies method, was tested with process waters from a recycled fiber (RCF) plant. The method was found to be reliable. Several chemicals and chemical combinations were tested in laboratory scale and compared as coagulation-flocculation agents in two dissolved air flotations (DAF) used as internal water treatment units at the RCF plant. With potential secondary stickies method, significant differences between the effectiveness of the chemicals were found, whereas no difference was seen in the quality of purified process water with traditional measuring methods. The measurement method was also used in mill during a two-week measuring period. As a conclusion, it can be said that this method can be used to monitor the quality and to predict the changes in DIP process water.
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Mohammadi, Leili, Abbas Rahdar, Edris Bazrafshan, Hamid Dahmardeh, Md Abu Bin Hasan Susan, and George Z. Kyzas. "Petroleum Hydrocarbon Removal from Wastewaters: A Review." Processes 8, no. 4 (April 10, 2020): 447. http://dx.doi.org/10.3390/pr8040447.

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Oil pollutants, due to their toxicity, mutagenicity, and carcinogenicity, are considered a serious threat to human health and the environment. Petroleum hydrocarbons compounds, for instance, benzene, toluene, ethylbenzene, xylene, are among the natural compounds of crude oil and petrol and are often found in surface and underground water as a result of industrial activities, especially the handling of petrochemicals, reservoir leakage or inappropriate waste disposal processes. Methods based on the conventional wastewater treatment processes are not able to effectively eliminate oil compounds, and the high concentrations of these pollutants, as well as active sludge, may affect the activities and normal efficiency of the refinery. The methods of removal should not involve the production of harmful secondary pollutants in addition to wastewater at the level allowed for discharge into the environment. The output of sewage filtration by coagulation and dissolved air flotation (DAF) flocculation can be transferred to a biological reactor for further purification. Advanced coagulation methods such as electrocoagulation and flocculation are more advanced than conventional physical and chemical methods, but the major disadvantages are the production of large quantities of dangerous sludge that is unrecoverable and often repelled. Physical separation methods can be used to isolate large quantities of petroleum compounds, and, in some cases, these compounds can be recycled with a number of processes. The great disadvantage of these methods is the high demand for energy and the high number of blockages and clogging of a number of tools and equipment used in this process. Third-party refinement can further meet the objective of water reuse using methods such as nano-filtration, reverse osmosis, and advanced oxidation. Adsorption is an emergency technology that can be applied using minerals and excellent materials using low-cost materials and adsorbents. By combining the adsorption process with one of the advanced methods, in addition to lower sludge production, the process cost can also be reduced.
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Baeyens, J., I. Y. Mochtar, S. Liers, and H. De Wit. "Plugflow dissolved air flotation." Water Environment Research 67, no. 7 (November 1995): 1027–35. http://dx.doi.org/10.2175/106143095x133266.

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Dissertations / Theses on the topic "Water - Purification - Dissolved air flotation"

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Löf, Ludwig. "Evaluation of Dissolved Air Flotation for Water Purification: With Focus on Floc Characteristics and PFAS." Thesis, KTH, Kemiteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298378.

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I detta projekt har experiment utförts med mål att förse kommunalförbundet Norrvatten med data som kan användas som underlag för beslutsfattande angående om deras fällningslinjer i vattenreningsprocessen ska köras i flotation eller sedimentering. För detta ändamål har koncentrationen av poly- och perfluorerade alkylsubstanser (PFAS) samt karaktär av agglomererade partiklar (flockar) undersökts och jämförts mellan fällningslinjer som körs i olika konfigurationer. För flockkaraktär har skapandet och stabiliteten av flockar varit av intresse, eftersom flotation har ett mer turbulent flöde där flockarna riskerar att brista. Partikelstorlek, storleksfördelning och zeta potential identifierades som egenskaper som reflekterar flockarnas karaktär, dessa analyserades i en zetasizer. Koncentrationen av elva vanligt förekommande PFAS ämnen analyserades i projektet. Resultatet av flockkaraktär tyder på att det ej fanns någon större skillnad i skapandet av flockar samt deras stabilitet mellan de olika fällningslinjerna som undersökts. Detta eftersom zeta potentialen var identisk (-6.45 mV) för de analyserade proverna från respektive process. Analyserna och provberedningen bedömdes ha en hög mätosäkerhet, och några förbättringar som föreslås för att öka säkerheten är genomförande av komplementerande fotoanalys för att bekräfta likheter i utseende mellan flockar, samt att genomföra mer analyser så att en statistisk giltighet av analysen kan kvantifieras. För PFAS koncentrationen så var koncentrationen av PFAS lägre i utgående vatten från fällningslinje som körs i sedimentation (7.5 ng/l), jämfört med prov från linje som körs i flotation (9.2 ng/l). För fällningslinjen som kördes i flotation så skapades skum med höga koncentrationer av PFAS (3800 ng/l) jämfört med analyserade vattenprover (5.5–9.2 ng/l), detta identifierades som en potentiell källa för PFAS-avlägsning. Resultaten av PFAS baserades endast på en provtagningsserie, och förbättringar av validitet kan åstadkommas genom samling av mer analysdata för samma processer, och genom att analysera ett av proverna i två olika instrument, som båda analyserar PFAS koncentration.
In this project, attempts have been made to collect data that allows the municipal association Norrvatten in the decision-making process on the  flotation/ sedimentation step of their water treatment process. In this sense, poly- and perfluorinated alkyl substances (PFAS) concentration and the characteristics of agglomerated particles (flocs) have been investigated and compared between the two modes that the process can be operated. For the floc characteristics, the creation and stability of the flocs were investigated, and the particle size, size distribution and zeta potential was identified as important properties and thereafter analysed using the instrument zetasizer. The concentration of eleven different PFAS compounds were analysed. The results of floc characteristics show that there is no major difference in creation and breakage of flocs in the two investigated modes, since the analysed samples had the same zeta potential, -6.45 mV. The results were deemed uncertain because of varying results, and improvement suggestions include using photoanalysis to confirm similar floc appearances and to produce more data so a statistical validity can be quantified. As for the PFAS concentration, the concentration of PFAS were slightly lower in the treatment step in which sedimentation was utilized (7.5 ng/l) compared to when flotation was utilized (9.2 ng/l). The flotation mode did, however, create foam with a high PFAS concentration (3800 ng/l) compared to the liquid samples (5.5-9.2 ng/l), so a potential PFAS removal source was identified. The results were based on one sample series, so improvements of validity can be achieved by gathering more data, analysing more samples, and analysing the same sample in two different instruments measuring PFAS concentrations.
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Dlangamandla, Cynthia. "Bioflocculant dissolved air flotation system for the reduction of suspended solids-lipids-Proteinaceous matter from poultry slaughterhouse wastewater." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2485.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2016.
Poultry slaughterhouse wastewater (PSW) contains organic matter that can be degraded by microorganisms. Such matter can further be used by the microbial community as a nutrient source for growth. Moreover, this type of wastewater also contains a high quantity of particulate matter, lipids and proteins, including antimicrobial compounds such as triclosan (TCS) and trichlorocarbanilide (TCC) used during cleaning and sanitising of processing facilities. Lipids and particulate matter lead to clogging of pipes and fouling of diffusers in the wastewater treatment plants (WWTPs). To overcome this problem, a pre-treatment system such as a dissolved air flotation system (DAFs) in which synthetic flocculants are used, is commonly used prior to the biological treatment of the wastewater. Synthetic flocculants add to the environmental burden associated with the use of synthetic compounds, particularly when these compounds are used in WWTPs. This study focused on the reduction of suspended solids, lipids and proteinaceous matter using a bioflocculant- supported DAF for the treatment of PSW.
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Mukandi, Melody. "Modelling of a bioflocculant supported dissolved air flotation system for fats oil and grease laden wastewater pretreatment." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2637.

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Thesis (MTech (Chemical Engineering))--Cape Peninsula University of Technology, 2017.
In the recent past, the poultry industry in South Africa has grown due to an increased demand of poultry products as a result of population growth and improved living standards. Furthermore, this has led to poultry slaughterhouses generating high strength wastewater which is laden with a high concentration of organic and inorganic pollutants from the slaughtering process and sanitation of equipment and facilities. As a result, South Africa has promulgated restrictions and a set of quality standards for effluent discharged into the environment to minimize ecological degradation and human health impact. Hence, there is a need for improved Poultry Slaughterhouse Wastewater (PSW) pre-treatment prior to either discharge into municipal wastewater treatment plants (WWTP) or on-site secondary treatment processes such as anaerobic digesters. Additionally, amongst the pre-treatment methods for Fats, Oil and Grease (FOG) laden wastewater, flotation remains the most popular with Dissolved Air Flotation (DAF) system being the most applied. However, modelling and optimization of a biological DAF system has never been attempted before in particular for a bioflocculant supported DAF (BioDAF) for PSW pre-treatment. Process modelling and optimization involves process adjustment to optimize influential parameters. In this study, Response Surface Methodology (RSM) was used to develop an empirical model of a BioDAF for pre-treatment of PSW, for which a bioflocculant producer including production conditions, flocculant type and its floc formation mechanism, were identified. Twenty-one (n = 21) microbial strains were isolated from the PSW and their flocculation activity using kaolin clay suspension (4g/L) was quantified, with a mutated Escherichia coli (mE.coli) [accession number LT906474.1], having the highest flocculation activity even in limited nutrient conditions; hence, it was used for further analysis in other experiments. Furthermore, the optimum conditions for bioflocculant production achieved using RSM were pH of 6.5 and 36°C conditions which induced instantaneous bioflocculant production with the highest flocculation activity. The bioflocculant produced by the mE.coli showed the presence of carboxyl/amine, alkyne and hydroxyl functional groups, which was indicative that the bioflocculant contained both polysaccharides and some amino acids.
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Magalhães, Aléx Fabiano Ribeiro de. "Proposição, implantação, partida e ajustes de reatores biologicos e fisico-quimicos para tratamento e reciclagem de efluentes de lavadores de veiculos em escala real." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258217.

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Orientador: Carlos Gomes da Nave Mendes
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
Made available in DSpace on 2018-08-04T11:01:23Z (GMT). No. of bitstreams: 1 Magalhaes_AlexFabianoRibeirode_M.pdf: 2242026 bytes, checksum: b4ae2e107eb7317d892ade5a7815f862 (MD5) Previous issue date: 2005
Resumo:Com a intenção de preencher a lacuna decorrente de poucos estudos sobre o tratamento de efluentes da lavagem de veículos, na presente pesquisa, propõe-se um sistema de tratamento composto de biofiltros aerados submersos seguidos por flotação por ar dissolvido na remoção dos principais contaminantes contidos nos mesmos. Para isso, foi concebida, instalada e operada uma instalação protótipo em escala real, visando possibilitar a reutilização do efluente tratado. O sistema foi montado em uma transportadora e destinado ao tratamento dos efluentes de lavagens de caminhões tipo baú através de lavador tipo ¿rollover¿. Apesar de terem sido previstos três meses para a operação do sistema, vários problemas de origem operacional do próprio lavador de veículos impediram a realização dos testes de longa duração. Mesmo assim, o período de testes foi útil para estabelecer-se quais alterações físicas deveriam ser incorporadas à instalação proposta para a solução de diversos problemas específicos relativos à concepção original do sistema, subsidiando dados para a otimização de futuros sistemas a serem implantados em escala real. Concluiu-se que, após as modificações introduzidas, tais como a alteração de dispositivos de entrada e saída dos reatores, substituição de acessórios de controle de pressão e vazão, entre outros, a alternativa proposta para tratamento e reúso deste tipo de efluente é plenamente viável
Abstract: With the intention to contribute for aim of filling out the emptiness provoked by few studies on the treatment of carwash affluent, in this research, it intends to create a treatment system composed of aerated submerged biological filter (BAS) following for the dissolved air flotation (FAD) on the removal of the main pollutants present in this effluent type. For that, it was become designed, installed and operated an installation prototype in real scale, seeking the water recycling. The system was installed at cargo transport interprise and destined to the treatment of the carwash effluent type "rollover". In spite of it have been preview three months for the operation time of the system, several operational problems of the washer accomplish of the long time tests. Even so, the time of tests was useful to establish which physical alterations should be incorporate in the installation proposed for the solution of problems to the original conception of the system, subsidizing data for the otimization of the future systems to be implanted in real scale. This research was finish, after the modifications, such as the alteration of inlet and outlet devices of the reactors, pressure and flow control, among other, the proposal alternative for treatment and reuse of rollover type carwash effluent type is fully viable
Mestrado
Saneamento e Ambiente
Mestre em Engenharia Civil
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Vašalovská, Petra. "Modelový výzkum účinnosti separačních technologií úpravy vody." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225461.

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Goal of this research was to recognize dissolved air flotation efficiency by the help of turbidity and UV absorbance removal for different conditions. As different conditions are meant the efficiency for different baffle position, different detention time in separation zone and checking results with adding chemicals compared to results without adding chemicals.
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Petiraksakul, Anurak. "The efficiency of particle removal by dissolved air flotation." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/11168.

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The efficiency of flotation processes may be improved through an understanding of the flotation models. Two mathematical models, particle trajectory and mixing zone models, have been modified and used to describe flotation results obtained from a semi-continuous flotation rig. Two types of clay suspensions, kaolin and Wyoming bentonite, were used as representative raw materials treated with a cationic surfactant, hexadecyltrimethylammonium bromide (HT AB), and/or coagulants i.e. alum, ferric chloride and polyaluminium chloride (PAC). HT AB concentrations were varied in the range of I x 10-6 to 3 x 10-5 mol/L. Alum at a concentration of 40 mg/L, ferric chloride at 40 mg/L and PAC at 10 mg/L were the selected coagulant dosages to be used in flotation tests. For the clay-HT AB-coagulant system, a HT AB concentration of I x 10-s mol/L was used in the flotation tests. Suspension flow rate was chosen at 2 Llmin and recycle ratios were varied in the range of 6-40% at room temperature. Two categories, suspensions with and without flocs, have been considered. The trajectory model gave a good match even taking account of the decreases In flotation efficiency at high recycle ratios where flocs had been broken by shear gradients. This model included hydrodynamic and surface forces i.e. electrostatic, van der Waals and hydrophobic forces and was calculated by a Runge Kutta technique. The effect of the shear force on a size reduction was determined from particle size measurements (Lasentec apparatus) in a mixing tank and the results showed a decrease of floc sizes with increasing agitator speeds. Bubble zeta potentials obtained using a modified rectangular cell in a Rank Brothers' apparatus gave points of zero charge at concentrations of 1.61 x 10-9 mollL for HTAB, 1.69 x 10-8 mol/L for tetradecyltrimethylammonium (TTAB) and 2.37 x 10-7 mol/L for dodecyltrimethylammonium bromide (DTAB) at 2SoC respectively. Van der Waals and hydrophobic or hydration forces were obtained from contact angle measurements on solid surfaces. The hydrophobic forces were increased by increasing HT AB concentrations while the hydration effects occurred upon the addition of coagulants to the suspensions. A flocculation model using the extended-DLVO theory showed a good correlation when compared to experimental results. For the mixing zone model, an attachment efficiency for the aggregation of a particle and a bubble was proposed from a ratio between the energy barrier (E1) and the maximum free energy at equilibrium. When particle size is constant, the attachment efficiency values rise with increasing hydrophobic force levels. On the other hand, when floc sizes are increased, the attachment efficiencies are decreased due to the increase in the repulsive long range van der Waals force.
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Al-Shamrani, Abdullah A. M. "Destabilisation of oil-water emulsions and separation using dissolved air flotation." Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488142.

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McLoughlin, Liam. "A comparative study of flocculative water treatment by dissolved air flotation and sedimentation." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284679.

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Sjölander, Anna. "The effect of water chemistry and fibre-size distribution on dissolved air flotation efficiency." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19306.

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The purpose of this diploma work was to investigate the problem of insufficient fibre recovery in the dissolved air flotation-cell at the new thermomechanical pulping-line at Braviken Paper Mill. An investigation of the effect of process parameters on the removal efficiency in the micro-flotation process was undertaken.

The experiments were carried out for two setups at the Noss pilot plant with a small-scale flotation unit. Factorial design helped plan the experiments and four factors were controlled; temperature, fibre-size distribution, water quality and feed concentration. Three samples, feed, overflow and filtrate, were taken from each experiment and concentration measurements were made. The results were analyzed using the software MODDE.

The results from showed an influence from the fibre-size distribution. To see if the fibre-size distribution really had an effect on the results, follow-up experiments were carried out. These experiments showed no influence from temperature, fibre-size distribution or water quality. This concludes that none of those three factors influenced the results significantly.

Additional experiments were done to examine the influence from concentration and fibre-size distribution on the flotation efficiency and these showed an influence from the feed concentration. When increasing the feed concentration the efficiency of the flotation process decreased.

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Mohamad, Radzi Aliff R. "Removal of oil droplets from oil-in-water mixtures by dissolved air flotation (DAF)." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813553/.

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Dissolved air flotation (DAF) is a separation technique, often used after a primary gravity separator to enhance the quality of the wastewater, so it can be released to streams, rivers, and the sea in a manner not to violate the environment. DAF works by removing oil droplets from oil-in-water mixtures by air bubbles of an average diameter of 50 μm with a standard deviation of 5.5 μm. The air bubbles used in these experiments were generated as a result of rapid pressure reduction of water saturated with air when it released from the bottom of the DAF tank. The main aim of the DAF experiments reported here was to measure the removal efficiency of oil droplet mostly in a diameter range between 15 and 80 μm that were created using a static mixer. The DAF tank located at the University of Surrey was a scale model of existing DAF unit used by Thames Water plc. The effects of seven operating parameters that are believed to affect the performance of DAF were investigated. The operating parameters consist of inlet oil concentration, air saturator pressure, temperature, the salinity of continuous phase, type of oil, flow rate of the mixture and coagulant dosage. Two independent analysis methods were used to estimate the removal efficiency of oil droplet. They are a droplet counting and an oil-in-water measuring methods. The droplet counting method used a Coulter Counter that provided numbers of oil droplet passed through the aperture based on the selected size range. The oil-in-water measuring method used an ultraviolet and visible spectroscopy (UV-Vis), which the removal efficiencies were estimated from the absorbance values that were measured at the optimum wavelength of 400 nm. The analyses done with these two methods found that the inlet oil concentration and flow rate of the mixture into DAF tank were inversely proportional to the oil droplet removal efficiency. The other parameters such as saturator pressure, temperature, water salinity and alum dosage were directly proportional to the oil droplet removal efficiency. Vegetable oil, which has larger spreading coefficient than lamp oil obtained a better oil droplet removal efficiency. Coulter Counter showed that a better removal efficiency for vegetable oil obtained at larger oil droplet ranges size, 50μm and above. This was because the oil droplets were removed by gravity and enhanced by air bubbles. Contrary to lamp oil, which the worst removal efficiency was obtained at larger size ranges due to the coalescence of oil droplets. Results from these experiments were used to obtain a correlation that can predict removal efficiency. This was done by performing dimensional analysis. It was carried out using Buckingham Pi and scaling methods. It involved with the identification of two non-dimension and nine dimensional parameters. The dimensional analysis concluded that the removal efficiency is a function of eight other dimensionless groups, which are ratio of inlet oil and mixture flow rate.
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Books on the topic "Water - Purification - Dissolved air flotation"

1

Johannes, Haarhoff, and American Water Works Association, eds. Dissolved air flotation for water clarification. Denver, CO: American Water Works Association, 2012.

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Edzwald, James K. Dissolved air flotation: Field investigations. Denver, CO: AWWA Research Foundation and American Water Works Association, 1994.

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Hubáčková, Jana. Využití flotace při procesu úpravy vody =: Ispolʹzovanie flotat͡s︡ii v prot͡s︡esse obrabotki vody = Use of flotation in water treatment process. Praha: Výzkumný ústav vodohospodářský ve Státním zemědělském nakl., 1989.

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Edzwald, James K. Dissolved air flotation: Laboratory and pilot plant investigations. Denver, CO: AWWA Research Foundation and American Water Works Association, 1992.

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Edzwald, James K. Impacts of Filter Backwash Recycle on Clarification and Filtration. Amer Water Works Assn, 2001.

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(Editor), H. Kiuru, and R. Vahala (Editor), eds. Dissolved Air Flotation in Water and Wastewater Treatment: Selected Proceedings of the 4th International Conference on Daf in Water and Wastewater Treatment, ... in Helsinki, Finland 11-14 September 2000. IWA Publishing (Intl Water Assoc), 2001.

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Book chapters on the topic "Water - Purification - Dissolved air flotation"

1

Schers, G. J., and J. C. van Dijk. "Dissolved-Air Flotation: Theory and Practice." In Chemical Water and Wastewater Treatment II, 223–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77827-8_15.

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Edzwald, James K., Donald Q. Bunker, Jan Dahlquist, Lars Gillberg, and Torsten Hedberg. "Dissolved Air Flotation: Pretreatment and Comparisons to Sedimentation." In Chemical Water and Wastewater Treatment III, 3–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79110-9_1.

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Wang, Lawrence K., Mu-Hao Sung Wang, and Edward M. Fahey. "Innovative Dissolved Air Flotation Potable Water Filtration Plant in Lee, Massachusetts, USA." In Environmental Flotation Engineering, 73–93. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54642-7_2.

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Pfeifer, Rüdiger, and Hermann H. Hahn. "Dissolved Air Flotation: Efficient Removal of Micropollutants from Stormwater Runoff." In Chemical Water and Wastewater Treatment III, 297–306. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79110-9_22.

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Mayer, Jürgen, Linsheng Zhang, and Hermann H. Hahn. "Liquid-Solid Separation by Electroflotation: An Attractive Alternative to Dissolved Air-Flotation." In Chemical Water and Wastewater Treatment, 151–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76093-8_12.

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Liu, Xiao-yu, Peng Zhang, Jia-jun Hong, and Zhi-hua Wang. "Numerical Simulation of Dissolved-Air Flotation Process and Its Operation Parameters for Polymer-Flooding-Produced-Water Treatment." In Proceedings of the International Petroleum and Petrochemical Technology Conference 2020, 674–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1123-0_62.

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"DISSOLVED AIR FLOTATION." In Water Treatment Unit Processes, 163–88. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 1997. http://dx.doi.org/10.1142/9781848160798_0012.

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"Dissolved Air Flotation." In Introduction to Potable Water Treatment Processes, 58–71. Oxford, UK: Blackwell Publishing Ltd., 2009. http://dx.doi.org/10.1002/9781444305470.ch5.

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"Dissolved Air Flotation and Techniques." In Practical Waste water Treatment, 409–17. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2019. http://dx.doi.org/10.1002/9781119527114.ch19.

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Edzwald, James K. "Dissolved air flotation in drinking water treatment." In Interface Science and Technology, 89–107. Elsevier, 2006. http://dx.doi.org/10.1016/s1573-4285(06)80075-x.

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Conference papers on the topic "Water - Purification - Dissolved air flotation"

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Liu, Fang, Jun Ma, and Weichao Ma. "Removal of Particles from Water Using Dissolved Air Flotation." In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5163313.

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Lee, B. H., and W. C. Song. "High concentration of ozone application by the DAF (Dissolved Air Flotation) system to treat livestock wastewater." In WATER POLLUTION 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/wp060551.

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Hao, Sujuan, Yigao Song, Qian Huang, Bo Xie, and Mizhou Hui. "Notice of Retraction: A Novel Air-Purification Method for Making Dissolved Gases in Water." In 2011 5th International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2011. http://dx.doi.org/10.1109/icbbe.2011.5781195.

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Lertrojanachusit, Nattapong, Urisa Thunmasarnrit, Ratipat Techasuwanna, Phansak Linjongsubongkoch, Ittiwat Sa-Nguanwong, Parntip Kiravanich, Pongsak Metheethara, and Saran Umpuch. "1st Development of Advanced Purification of Produced Water Technology at Greater Sirikit Oil Field by Dissolved Gas Flotation Technique." In Offshore Technology Conference Brasil. Offshore Technology Conference, 2019. http://dx.doi.org/10.4043/29791-ms.

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Thyagarajan, Ashok, Debjyoti Banerjee, and Vijay Dhir. "Experimental Study of a Novel Hydro-Cyclone Apparatus (HCA) Using Flash Evaporation for Desalination and Water Remediation/Purification." In ASME 2020 Heat Transfer Summer Conference collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ht2020-8932.

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Abstract A novel apparatus that is capable of dynamic flash evaporation and phase separation using centrifugal flow (i.e., using a Hydro-Cyclone Apparatus/HCA) is explored in this study. The objective of this study is to demonstrate the segregation of phases using the novel apparatus that forms a stable air core at the center from a premixed air-water mixture. The stable air core is then retrieved using an air retrieval tube that is strategically placed in the test section for maximum retrieval of air. For the purpose of this study, a prototype of the apparatus was fabricated using rapid prototyping (3D Printing). Experiments were performed on the flow separator apparatus (HCA) by varying the ratio of the air and water flow rates. A high-speed digital image acquisition apparatus was used in this study for flow visualization in the HCA. Flow maps were generated based on the measurements for flow rates and pressure drops obtained from the experiments conducted in this study. This enabled the measurement of several parameters, which include: the dimensions and morphology of the stable air core, entrainment of the water from the air retrieval tube, etc. The data obtained from this study will be used in the design of experiments for the novel apparatus to demonstrate the feasibility of a compact dynamic flash evaporator and separator system that can be used for various water conservation applications, which include: desalination (e.g., seawater, brackish water, as well as total dissolved solids/ TDS from produced water in oil and gas industries), water remediation (e.g., suspended solids) and purification (e.g., urine purification apparatus/ UPA).
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Iwai, Manabu, Ryouta Yamashita, Satoshi Anzai, and Shinichi Ninomiya. "Removal Machining Performances by Using Inert Gas Filled Micro Bubble Coolant." In JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/lemp2020-8558.

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Abstract The authors have proposed a micro bubble coolant in which micro bubbles (20∼50μm in diameter) are included in water soluble coolant. In the previous study, it was confirmed that the tool life was improved by applying the micro bubble coolant to various machining operations such as drilling, turning and grinding. Also, purification effects of the micro bubble coolant were found. In this study, micro bubble coolant in which inert gases (N2 and CO2) were mixed was proposed to be applied to grinding processes for further improvement in grinding performances. When nitrogen gas (2L/min) was mixed with the micro bubble in the water soluble coolant (70L), amount of the dissolved oxygen in coolant decreased to 0.5mg/L. And concentration of the carbon dioxide gas in the coolant increased to 100mg/L when carbon dioxide gas (2L/min) was mixed in. From the result of grinding test on high speed steel, it was found that grinding performances improved when the micro bubble coolant with any of air, N2 and CO2 gases was used. The grinding force decreased by a factor of about 15% and the tool life increased by 20∼30%. When nitrogen gas was mixed in, the surface roughness improved by about 15%. In grinding stainless steels, performances such as grinding force, tool life and surface roughness improved by 10% when nitrogen gas was mixed in. In addition, a tendency of flank wear reduction and improvement in the surface roughness were observed when air micro bubble was mixed into the coolant in the turning of high carbon steel and Inconel 718 as well. When N2 micro bubble was generated in the coolant, a flank wear was reduced by 20% and surface roughness was improved by 30 to 40%. These effects were higher than the coolant with air micro bubble.
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