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Rozprawy doktorskie na temat „Phosphoric sludges”

Autor: Grafiati

Data publikacji: 23 listopada 2024

Data aktualizacji: 31 lipca 2025

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1

Chanouri, Hamza. "Valorisation des terres rares à partir du phosphogypse et boues phosphoriques : cas d'utilisation de la lixiviation basique." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5029.

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Les approches hydrométallurgiques dévouées à l'extraction et la séparation des éléments de terres rares (TRs) ont devenus des thématiques de recherche d'actualité à l'échelle internationale en raison des propriétés physico-chimiques cruciales des TRs dans la technologie de pointe. Par conséquent, la dernière décennie a connu une forte préoccupation focalisée sur le développement des méthodes durables pour valoriser les TRs à partir des ressources de faible concentration, afin de remédier au problème de la dynamique croissante du marché de TRs issue du déséquilibre entre l'approvisionnement et

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2

Burke, Russell Armstrong. "Biological excess phosphorus removal in short sludge age activated sludge systems." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/7582.

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Includes bibliography.<br>The objective of this investigation was to test, at laboratory-scale, the behaviour of short sludge age biological excess P removal systems, to assess the response of the systems under non-nitrifying and nitrifying conditions, to determine the optimal system configuration(s) and operational parameters, and to check the settling characteristics of the mixed liquor produced in the systems. A secondary objective was to use the observed response data to test the predictive qualities of both the general activated sludge model of Dold, Ekama. and Marais (1985) and the semi-

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3

Bhasin, Aditi. "Recovery of Phosphorus from Incineration of Sewage Sludge." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214991.

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The primary source of phosphorus, phosphate rock, is a non-renewable resource which is expected to get exhausted in the next 50 – 100 years. Sewage sludge in Sweden constitutes 25% of the annual phosphorus in the country, making it a potentially significant source for phosphorus recovery. The aim of this project was to identify the potential for phosphorus recovery from incineration of dewatered and digested sewage sludge in Fortum Värme’s power plants in Stockholm. The study was limited to two boilers located at Bristaverket, Stockholm - boiler B1, a bio-fired fluidized bed boiler and boiler

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4

Stark, Kristina. "Phosphorus release and recovery from treated sewage sludge." Doctoral thesis, Stockholm : KTH Architecture and the Built Environment, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-402.

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5

Wentzel, Mark Charles. "Biological excess phosphorus removal in activated sludge systems." Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/8309.

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Includes bibliographies.<br>When this investigation was commenced in 1983 two activated sludge systems had been developed in South Africa that accomplish biological excess phosphorus (P) removal, the UCT and modified Bardenpho systems. To predict the P removal in these systems, an empirical model had been developed. In the empirical model, P removal was formulated in terms of some of the system parameters, such as anaerobic mass fraction, available readily biodegradable COD and active mass concentration. Organisms directly implicated in biological excess P removal (poly P organisms) did not fe

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6

Hoffman, Victor, and Anton Marmsjö. "Combustion of sludge in Fortum’s plants with possible phosphorus recycling." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146974.

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The management of waste is by all means a great challenge to any society. In Sweden, the past decades has seen legislation progressing in congruence with concerns over environmental stress from inefficient waste management. The legislative changes aim primarily to promote waste reduction and better waste utilization. Sludge is a waste-type from different industrial processes and is unfortunately of limited reuse and recycling-value, but sludge combustion for energy recovery appears promising. Also, the oftentimes high phosphorus content in sludge strengthens the potential of extracting phospho

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7

Gao, Lu. "Phosphorus Reclamation from Municipal Wastewater Sludge for Fertilizer Production." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36712.

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The increasing population with its associated rising food demand requires more agricultural fertilizers to maintain the harvest for food security. However, the natural calcium carbonate phosphate mineral (carbonate apatite) used to produce phosphorus (P) fertilizer is a non- renewable ore. Therefore, in this study, the objective is to extract the inorganic polymeric phosphate (polyphosphate: polyP) P-component in waste activated sewage sludge (WAS) from Ottawa’s municipal wastewater plant (ROPEC). Once extracted, the goal was to break down the polyP to inorganic phosphate (Pi) to produce carbo

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8

Sirén, Ehrnström Matilda. "Recovery of Phosphorus from HTC Converted Municipal Sewage Sludge." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-290.

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With a growing population but scarce primary phosphorus sources, recycling of the vital element has become an important research area throughout the last decades. Several streams in society are potential resources for recirculation but municipal sewage is considered one of the most available materials. With current technologies in wastewater treatment, over 95 % of the influent phosphorus is captured in the sludge along with a variety of other nutrients. However, due to increasing fractions of pharmaceutical residues and heavy metals also following the sludge, direct use as fertiliser is being

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9

Hannl, Thomas Karl. "Phosphorus recovery from sewage sludge fluidized bed gasification processes." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81024.

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One of the most sustainable pathways of sewage sludge treatment in recent years has been thermal conversion. The benefits of thermal treatment of sewage sludge are the recovery of energy or valuable chemical products, the destruction of harmful organic compounds, the separation of heavy metals from the P-rich coarse ash fraction, and the decreased and sanitized ash volume. The ashes created by these thermal conversion processes of sewage sludge are often rich in P that is mostly present in minerals with low plant-availability such as apatite. Due to the enrichment of P in the created ashes, a

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10

Van, der Merwe Petrus. "Phosphorus phyto-availability and fertilizer value of petrochemical and municipal wastewater sludges." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46060.

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A growing population, urbanization and an increase in the number of industries is causing an increase in sewage sludge (SS) that needs to be either beneficially used or disposed of. Application of SS to agricultural lands is a well-known practice but the plant available phosphate and phosphate fertilizer value of SS has been of concern. This is especially due to the wide variety of soils that SS is applied to and the different phosphate removal processes that sewage waste water undergoes at the water care works and the source used to produce SS. Phosphate phyto-availability and phospha

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11

Sen, Dipankar. "Kinetics of the release and precipitation of phosphorus in anaerobic digesters sequencing biological phosphorus removal systems." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91075.

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The extent of release and precipitation of phosphorus stored in the poly-phosphate granules of microorganisms present in anaerobic digesters sequencing a biological phosphorus removal (BPR) activated sludge system was examined. The research was conducted at the York River Wastewaster Treatment plant which was converted from a conventional system to a A/O process for biological phosphorus removal. The primary and secondary anaerobic digesters each had a solids retention time of approximately 120 days. The results indicated that at least 60 percent of the phosphorus in the poly-phosphate granu

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12

Carliell-Marquet, Cynthia. "The effect of phosphorus enrichment on fractionation of metals and phosphorus in anaerobically digested sludge." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/17074.

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In designated nutrient-sensitive areas, phosphorus must be removed from sewage before it is discharged to the receiving water body. Phosphorus-rich sludge is generated, which is usually digested anaerobically prior to disposal. This research investigated the effect of phosphorus enrichment on metal and phosphorus fractionation in anaerobically digested sludge. The use of two complementary sequential chemical extraction procedures to measure phosphorus and metal fractionation, was a key focus of the research. The fractionation procedures were tested by sequentially extracting inorganic compound

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13

Siddique, Muhammad Tariq. "Phosphorus reactions and leaching potential in soils amended with organic wastes." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269959.

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14

Wilmes, Paul. "Metaproteomic investigations of enhanced biological phosphorus removal in activated sludge." Thesis, University of East Anglia, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426993.

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15

Keeley, James. "Coagulant recovery from waterworks sludge." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9218.

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Coagulation is a ubiquitous process in the treatment of raw surface water for eventual potable use. Despite its capabilities, the sheer scale of its use is manifested in the volumes of chemicals it demands and waste sludge it produces. Recovering and reusing the chemical activity of the coagulant sludge in water treatment is a logical solution but this practice has been restricted by the presence of contaminants within the sludge. This thesis has investigated methods that can separate the coagulant metals from these primarily natural organic contaminants, with an aim of producing a sufficientl

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16

Al, Tahmazi Talib. "Characteristics and mechanisms of phosphorus removal by dewatered water treatment sludges and the recovery." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/105255/.

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The use of novel industrial by-products (IBPs) to remove phosphorus (P), instead of high-cost P removal techniques, is one of the sustainable solutions to protect aquatic life from excessive P discharges. One of such IBPs is dewatered drinking water treatment works sludges generating from using aluminium or iron salts as coagulant during the drinking water treatment process. Previous studies have shown that the sludges hold promise as a novel adsorbent for the removal of P from wastewaters; however, comprehensive investigation into factors affecting the P removal and the recovery is lacking. T

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17

Johannesson, Gudmundur Hrafn. "Sewage sludge characterization and evaluation of phosphorus availability under greenhouse conditions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0020/MQ47334.pdf.

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18

Clayton, John Andrew. "Denitrification kinetics in biological nitrogen and phosphorus removal activated sludge systems." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/21139.

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In order to size the anoxic reactors in nutrient (N and P) removal activated sludge plants, it is essential to know the denitrification kinetics that are operative in such systems. To date, denitrification kinetics have been accurately defined only for systems that remove N alone; little research has been performed on denitrification in N and P removal plants.

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19

Sui, Peng Zhe. "Behavior of Metals in the Advanced Sewage Treatment Process with Excess Sludge Reduction and Phosphorus Recovery." 京都大学 (Kyoto University), 2010. http://hdl.handle.net/2433/131884.

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20

Wable, Milind Vishnd. "Investigation of hypothesized anaerobic stabilization mechanisms in biological phosphorus removal systems /." This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-05042006-164504/.

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21

Power, Sean P. B. "Chemical phosphorus removal from municipal wastewater by the addition of waste alum sludge to the activated sludge system." Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/8299.

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Includes bibliography.<br>In many cases, waterworks waste alum sludge is disposed of by discharging it into a stream. In this investigation the disposal of alum sludge to activated sludge systems treating municipal sewage is investigated. The advantage is that it is a better method of alum sludge disposal, and moreover the addition of alum sludge removes phosphorus from the wastewater through chemical precipitation. Two long sludge age (20 days) Modified Ludzack Ettinger (MLE) predenitrification systems receiving unsettled municipal wastewater at a controlled concentration of 500mg COD/l as in

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22

Shober, Amy L. "Chemical speciation and redox effects on phosphorus release from biosolids and manure amended soils." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.99 Mb., 179 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3221058.

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23

Chauke, Rhandu. "Mineralisation and bioavailability of phosphorus from poultry manure and sewage sludge-based phospho-composts for maize production." Thesis, University of Limpopo (Turfloop Campus), 2014. http://hdl.handle.net/10386/1171.

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Thesis (MSc. Agriculture (Soil Science)) -- University of Limpopo, 2014<br>Phospho-composts of different mix ratios (5:5, 7:3, 8:2 and 9:1) were produced through thermophilic co-composting of poultry manure (PM) and sewage sludge (SS) with ground phosphate rock (GPR). Composted PM and SS without GPR addition were included as control. Cured phospho-composts were chemically characterised and used for both laboratory incubation and greenhouse studies, respectively for phosphorus (P) mineralisation and bioavailability, over a period of 42 days. Results revealed that Bray-P1 concentr

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24

Carlborg, Ylva. "Ash transformation during combustion of phosphorus-rich industrial sludge : Investigation of phosphorus recovery potential, and effects on emissions and deposit formation." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-103834.

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Effective use of resources is essential in the development towards a sustainable industry. Waste products, such as sludge from industrial waste water treatment, often contain valuable reserves of plant nutrients but this resource is nonetheless commonly disposed of as contaminated waste. Approximately 1 500 ton phosphorus per year is added in biological waste water treatment at the Swedish pulp and paper industries and this non-renewable resource thereby ends up in their so called biosludge. The most common way to discard the sludge is by incineration. Besides the high levels of phosphorus, t

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25

Unal, Eda. "Investigation Of Magnesium Ions Effect On Sludge Properties In Phosphorus Deficient Bioreactors." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612620/index.pdf.

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The activated sludge process efficiency depends on separation of microbial cells from treated wastewater. Separation can fail due to a number of problems. One of these problems is sludge bulking which is non-settling situation of biomass. Former studies showed that phosphorus deficiency caused filamentous sludge bulking with increasing magnesium ion concentrations. The main objectives of this study are to find out the effect of magnesium ions on sludge properties in phosphorus deficient medium and to determine if there is any bulking. Three different concentrations of magnesium (0.5, 5, 15 meq

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26

Copp, John B. "COD balances in biological nutrient (nitrogen and phosphorus) removal activated sludge systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0022/NQ50987.pdf.

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Copp, John B. "COD balances in biological nutrient (nitrogen and phosphorus) removal activated sludge systems /." *McMaster only, 1998.

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Clark, T. "The impact of chemical addition for phosphorus removal on activated sludge treatment." Thesis, Cranfield University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268135.

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Rowley, Maxine Joy. "Spatial distribution of phosphorus in the sediments of a constructed wetland receiving treated sewage effluent /." [Richmond, N.S.W.] : Centre for Water and Environmental Technology, Water Research Laboratory, University of Western Sydney, Hawkesbury, 1998. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030806.121149/index.html.

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Thesis (M.Sc. Hons.) -- University of Western Sydney, Hawkesbury, 1998.<br>Thesis submitted for the degree of Master of Science (Hons.). Spine title: Phosphorus in constructed wetland sediments. Includes bibliographical references (leaves 114-123).

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Ryan, Gregory Lawrence. "Mechanisms of phosphorus removal by constructed wetland systems /." View thesis, 2003. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20031003.141904/index.html.

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Thesis (PhD) -- University of Western Sydney, 2003.<br>"Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Western Sydney, Hawkesbury." "April 2003" Bibliography: leaves 287 - 302.

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Scott, James D. "Availability and distribution of nitrogen and phosphorus from sewage sludge in the plant-soil-water continuum." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/43892.

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Research was conducted in 1984 and 1985 to determine N and P availabilities for barley (Hordeum vulgare L.) and com ( Zea mays L.) grown on four sludge-amended soils. Tests were conducted on the Acredale silt loam (Typic Ochraquall), Bojac loamy sand (Typic Hapludult), Davidson clay loam (Rhodic Paleudult), and Groseclose silt loam (Typic Hapludult) soils. An aerobicallyÂ·digested sewage sludge from a sewage treatment plant with major industrial irrputs was applied at rates of 0, 42, and 84 dry Mg ha' 1 on the poorly-drained Acredale soil. Rates of 0, 42, 84, 126, 168, and 210 dry Mg ha'1 were

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32

Haile, Henok Debessai. "Sustainable Phosphorus Management in Sweden : A study of phosphorus recycling from wastewater sludge in several municipalities of the Östergötland County." Thesis, Linköpings universitet, Tema Miljöförändring, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122365.

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The Swedish Environmental Agency (SEPA) proposed a national target to increase the rate of phosphorus recycling from wastewater sludge in 2013. Reusing phosphorus from wastewater sludge by spreading it on arable lands raises the risk of contamination and substance deposition in soils. In addition to quantifying the targeted rate of recycling, the proposal has also introduced new thresholds that limit the concentrations of undesired substances in wastewater sludge. This thesis assesses the potential challenges and opportunities in implementing the proposed measure in the Swedish municipality se

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Boontian, Nittaya. "Using the activated sludge model 2d (ASM2d) to understand and predict the phosphorus accumulating organisms mechanism in enhanced biological phosphorus removal in relation to disintegrated sludge as a carbon source." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7864.

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Carbon sources are considered as one of the most important factors in the performance of enhanced biological phosphorus removal (EBPR). Disintegrated sludge (DS) can act as carbon source to increase the efficiency of EBPR. This research explores the influence of DS upon phosphorus removal efficiency using mathematical simulation modeling. Activated Sludge Model No. 2d (ASM2d) is one of the most useful of activated sludge (AS) models. This is because ASM2d can express the integrated mechanisms of phosphorus accumulating organisms (PAOs) under aerobic, anaerobic and anoxic conditions. Cont/d.

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Belia, Evangelia. "Phosphorus release during treatment of sludge derived from a bench-scale EBPR plant." Thesis, University of Strathclyde, 2002. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28864.

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This thesis describes the development of enhanced biological phosphorus removal (EBPR) in a lab-scale sequencing batch reactor (SBR) and the release of phosphorus during the storage and thickening of sludge produced in this reactor. In the first phase of the experimental work a fast start-up method for EBPR development was established by the addition of a pure culture of Acinetobacter lwoffi to a conventional activated sludge. Investigations revealed that the performance EBPR depended on the combination of influent COD and phosphorus values and that in the investigated range, EBPR functioned i

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Knight, Jonathan James. "Chemical phosphorus removal and its influence on sewage sludge particulates and metal availability." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324631.

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Nash, Jeffrey William. "Characteristics and conditioning of anaerobically digested sludge from a biological phosphorus removal plant." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44128.

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A study of the anaerobically digested sludge form a full-scale biological phosphorus removal (BPR) plant (York River Wastewater Treatment Plant, York River, Va.) was conducted to determine the effects of BPR on sludge characteristics and conditioning requirements. Data collected from the plant indicated that both the total and soluble phosphorus (P) concentrations in the anaerobically digested sludge increased dramatically with the initiation of BPR. Accompanying this increase in total P was an increase in the total concentrations of magnesium and potassium content of the sludge, sup

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Saktaywin, Wilasinee. "Development of advanced sewage treatment process with excess sludge reduction and phosphorus recovery." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144545.

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Grey, Mark Alan. "The mobility and fate of phosphorus following municipal biosolids application to forest soils /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/5554.

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Van, Lierde Patrick G. "Nucleation, milk and membranes as modifications to enhance biological phosphorus removal in activated sludge." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/16784.

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Enhanced biological phosphorus removal (EBPR) was researched from the performance of a modified University of Cape Town (UCT), anaerobic-anoxic/nitrifying-aerobic process. The work focussed on high P influent where milk was compared to carbohydrates as exogenous added carbon and typical settled sewage. The results confirmed that at equal COD load in the influent (minimum COD:P (250:5) ratio for EBPR), milk always provided sufficient soluble substrate than the carbohydrate mix, but also improved the EBPR performance. The laboratory scale treated 10L/day where 2 parallel treatment trains for mil

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Aksu, Ceren. "The Role Of Calcium Ion On Activated Sludge Biochemical And Physical Properties In Phosphorus Deficient Growth Medium." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612580/index.pdf.

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Nutrients and cations have significant effect on activated sludge characteristics and therefore effect the efficiency of whole processes. To determine the properties in phosphorus deficient medium and the effect of calcium ions two reactor sets with two different phosphorus concentration (C/N/P=100/5/0.05 and C/N/P=100/5/1), three different concentrations of calcium (0.5, 5, 15 meq/L) were operated with 8 days of sludge residence time and an effective volume of 2 L. Results showed amount and composition of EPS was dependent on calcium and phosphorus concentrations. Except for the highest calc

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41

Wable, Milind Vishnu. "Investigation of hypothesized anaerobic stabilization mechanisms in biological phosphorus removal systems." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/27531.

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Balaguer-Barbosa, Maraida. "Recovery of Nutrients from Anaerobically Digested Enhanced Biological Phosphorus Removal (EBPR) Sludge through Struvite Precipitation." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7471.

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Water resources in Florida have been severely degraded by eutrophic conditions, resulting toxic algae blooms, which negatively affect health and tourism. Eutrophication, or excessive amount of phosphorus (P) and nitrogen (N) in water, overstimulates the production of aquatic plants, depletes dissolved oxygen, and deteriorates the aquatic environment. However, phosphorus is a non-renewable resource essential for all living organisms. In fact, more than half of the total demand for P globally is to supply the food industry, which has concerningly accelerated the depletion rates of phosphate rese

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Turtin, Ipek. "Investigation Of Activated Sludge Bioflocculation: Influence Of Magnesium Ions." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606605/index.pdf.

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Activated sludge systems are the most widely used biological wastewater treatment processes all over the world. The main working principles of an activated sludge system are the oxidation of biologically degradable wastes by microorganisms and the subsequent separation of the newly formed biomass from the treated effluent. Separation by settling is the most troublesome stage of an activated sludge process. A decrease in the efficiency of the separation of microbial biomass from the treated effluent causes a decrease in the overall efficiency of the treatment plant. The efficiency of the separa

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44

Besancon, Axelle. "Technologies and multi-barrier systems for sustainable groundwater recharge and irrigation." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5726.

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Managed aquifer recharge (MAR) consists of artificially replenishing groundwater to facilitate reuse and/or the associated environmental benefits. Meanwhile, soil aquifer treatment (SAT) is a process of geo-purification designed and operated to improve the quality of the infiltrating water and is thus a type of MAR. SAT consists of a basin operating under rotation of drying and wetting periods. Often, SAT involves water of impaired quality applied onto soil and consequently it implies various risks of health, geochemical and physical nature with difficult or irreversible remediation. To study

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Mbwele, Lydia Ambakisye. "Microbial Phosphorus Removal in Waste Stabilisation Pond Wastewater Treatment Systems." Licentiate thesis, KTH, School of Biotechnology (BIO), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3876.

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<p>Waste Stabilisation Ponds (WSPs) are characterised by low phosphorus (P) removal capacity. Heterotrophic bacteria are principal microbial agents in WSPs in addition to algae. As treatment proceeds in WSPs, algal growth increases and pH rises, this has lead to believe that P removal is mainly through sedimentation as organic P algal biomass and precipitation as inorganic P. In activated sludge treatment plants (AS), microbial P removal has been improved and is termed as enhanced biological phosphorus removal. There was a need to establish whether it was possible to enhance P removal in WSPs.

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Nordin, Andreas. "Heavy metal removal from sewage sludge by pyrolysis treatment." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-8807.

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Sewage sludge is the product from wastewater treatment that mostly is considered as a waste material. However, it contains several nutrients, especially phosphorus, potassium and nitrogen which are excellent fertilizers. The downside is the harmful content it also carries with pathogens, heavy metals and a variety of organic pollutants that in many cases have unknown effects on the ecosystem. A possible solution to this problem could be to pyrolyse the sewage sludge and by that decrease the levels of heavy metals and also render both pathogens and organic pollutants harmless. In this thesis pr

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Erdal, Zeynep Kisoglu. "An Investigation of the Biochemistry of Biological Phosphorus Removal." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26383.

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Although enhanced biological phosphorus removal (EBPR) and complete biological nutrient removal (BNR) systems can be operated successfully by experienced operators, the accuracy of design and strength of the scientific background need to be reinforced to enable accurate modeling and economically optimal design. One way to accomplish this would be through a better understanding of the biochemical mechanisms and microbial population dynamics that determine the reliability and efficiency of EBPR, and the utilization of this information to improve the design and operation of BNR plants. Such know

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Häggström, Gustav. "Experimental studies of ash transformation processes in thermochemical conversion of P-rich biomass and sludge." Licentiate thesis, Luleå tekniska universitet, Energivetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-78593.

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The efficient use of resources and sustainable recovery of various materials are important to minimize the anthropogenic impact on the climate and environment. One such resource is the phosphorus present in manure and sewage sludge. Various technologies are currently being developed to recover the phosphorus for the use of fertilizers in agricultural applications. Thermochemical conversion presents an opportunity to recover energy from these materials. At the same time, elements can be recovered in ash fractions, potentially harmful organic substances can be destroyed and heavy metals fraction

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Hassan, Parssa. "Simultaneous management of nitrogen and phosphorus in dewatered sludge liquor by combining ANAMMOX process with struvite crystallization." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45119.

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A process combination of anaerobic ammonium oxidation (ANAMMOX), followed by struvite crystallization, was examined for simultaneous removal of nutrients (nitrogen and phosphorus) from dewatered sludge liquor or centrate. Phosphorus recovery as struvite can recover more than 90% P from centrate; however, the effluent after struvite crystallization still contains high concentrations of ammonium nitrogen (NH₄-N). ANAMMOX is a cost effective alternative process for NH₄-N removal and this process can remove 85% - 90% of NH₄-N from centrate, but leaves high concentration of phosphorus phosphate (PO

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Harding, TH. "A steady state stoichiometric model describing the anaerobic digestion of biological excess phosphorus removal waste activate sludge." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5042.

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A. Background, Principle Objectives and Scope Until the mid-1990's model-based studies on wastewater treatment plants (WWTPs) focussed on the development of models describing a single unit operation within the WWTP i.e. an activated sludge system, an anaerobic digester or some other WWTP unit operation. The focus of these model-based studies changed in the late 1990's due to limitations in linking different models in applications for multi unit operation or full scale plant-wide designs or process evaluations. The boundaries related to the focus of these model-based studies within the WWTP, wa

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