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Dissertations / Theses on the topic 'Phosphate precipitation'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Ramaru, Rendani. "Phosphate precipitation as struvite from municipality wastewater." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5412.

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Tshwane Municipality produces approximately 4Ml/day of dewatering liquors arising from municipal sludge from a wastewater treatment plant. The sludge being dewatered is a combination of an anaerobically digested primary sludge and an undigested waste activated sludge. High phosphate and nitrogen are released into water during the anaerobic treatment process. High concentrations of these nutrients in the wastewater lead to eutrophication, which is a major environmental problem (Doyle et al., 2000). In view of the above problem, the aim of this project was to investigate the feasibility of preci

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2

Van, der Houwen Jacqueline A. M. "Chemical principles of calcium phosphate dissolution and precipitation." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272517.

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3

Ezquerro, Ander. "Struvite Precipitation and Biological Dissolutions." Thesis, KTH, Mark- och vattenteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-31451.

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Struvite is a salt that is formed out of Mg2+,NH4+ and PO43- and it crystallizes in form of MgNH4PO4.6H2O. Struvite‟s (magnesium ammonium phosphate or MAP) precipitation has recently been regarded as an interesting technique to remove phosphate and ammonium from waste water. The high elimination rates and the possibility of recycling the struvite as a direct slow release fertilizer make this process feasible and appealing. However, the costs due to the raw chemicals needed are drawbacks that leave aside the application of the process in some facilities. The MAP biological dissolution makes po

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4

Plant, Lorraine Jean. "The recovery of phosphorus from wastewaters using calcium phosphate precipitation." Thesis, University of Reading, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288730.

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5

Robson, P. "Structural studies of phosphates and molybdophosphates formed in nitric acid : Vibrational spectroscopic, isotopic-tracer and plutonium/americium absorption studies on zirconium phosphate and ammonium/caesium/rubidium molybdophosphates formed in nitric ac." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379904.

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6

Thammakan, Nirawan. "Synthesis and characterisation of calcium phosphate compositions by precipitation and 'biomimetic methods'." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230656.

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Calcium phosphate compounds have been widely utilised in the interdisciplinary field of biomaterials research and are used clinically in a number of medical devices. In the present work, calcium phosphate compositions were prepared by two precipitation methods: a classic aqueous precipitation method and a novel biomimetic precipitation method. The aqueous precipitation method was used to produce a range of hydroxyapatite and carbonate-substituted hydroxyapatite compositions that would act as reference materials, but more importantly to allow a method of determining the Ca/P molar ratio of thes

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7

Wong, Alfred T. C. "Precipitation behaviour of calcium phosphate : a model for hard tissue mineralisation." Thesis, University of Oxford, 1993. http://ora.ox.ac.uk/objects/uuid:1d2e879d-0972-40ee-a931-664f5f043667.

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Various aspects of the precipitation behaviour of calcium phosphate in aqueous media have been investigated using seeded growth in conjuction with constant-volume and constant-composition techniques under different physical and chemical conditions. In each case, precipitation was allowed to proceed for up to seven days. The solid precipitates thus obtained were characterised by means of scanning electron microscopy, powder X-ray diffractometry and wavelength dispersive spectroscopy. During these precipitation experiments, the formation of the thermodynamically most stable and most supersaturat

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8

Lin, Alex Y. "Precipitation of Phosphate Minerals from Effluent of Anaerobically Digested Swine Manure." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4359.

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Swine production represents approximately 40% of the world's meat production, and its wastes contain high concentrations of organic carbon, nitrogen (N), and phosphorus (P). Anaerobic digestion is an increasingly popular technology for treating animal wastes while simultaneously generating energy. Its propagation and ability to solubilize organic N and P make adding a struvite recovery process attractive. Recovering struvite (MgNH4PO4) from anaerobically digested swine waste can address global P shortages, meet P discharge guidelines, and produce slow-release fertilizer, which can be sold fo

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9

Webb, Kelvin March. "Chemical modelling for the precipitation of metal ammonium phosphate salts from wastewater solutions." Thesis, Webb, Kelvin March (1996) Chemical modelling for the precipitation of metal ammonium phosphate salts from wastewater solutions. PhD thesis, Murdoch University, 1996. https://researchrepository.murdoch.edu.au/id/eprint/52402/.

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The precipitation of struvite (MgNH4PO46H2O) in a variety of wastewaters and other environmental sources has been described by a number of authors. This technique offers the opportunity of simultaneous removal of soluble nitrogen (in the form of ammonia) and phosphorus (as ortho-phosphate) from wastewaters, thus moderating their impact in natural receiving waters, as well as producing a slow release fertilizer of considerable agronomic value. The solution chemistry of struvite precipitation is not well described, despite a number of pilot scale investigations having been mounted. A mod

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10

De, Haas David Walter. "The use of simultaneous chemical precipitation in modified activated sludge systems exhibiting biological enhanced phosphate removal." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/16090.

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Includes bibliographies.<br>Since its first full-scale implementation in the late 1970s, considerable practical experience has been gained with biological enhanced phosphate removal (BEPR) in activated sludge systems for treating wastewater. However, BEPR tends to be sensitive and subject to many fluctuations, making it difficult to achieve full compliance with discharge standards. Simultaneous chemical addition in the activated sludge systems is a practical and economically attractive means of increasing the phosphate (P) removal capacity of these systems. However, it is also clear that the e

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11

Barca, Cristian. "Steel slag filters to upgrade phosphorus removal in small wastewater treatment plants." Thesis, Nantes, Ecole des Mines, 2012. http://www.theses.fr/2012EMNA0045/document.

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L’objectif de ce travail est la mise au point de filtres garnis de laitiers d’aciéries destinés au traitement du phosphore (P) des eaux usées au sein de petites installations. Deux types de laitiers on été testés: laitiers de four à arc électrique (EAF), et laitiers d'aciérie de conversion (BOF). Une approche intégrée a été suivie, avec investigations à différentes échelles: (i) Des expériences en flacons ont été réalisées pour établir les capacités de rétention du P de laitiers produits en Europe, et ainsi sélectionner les échantillons les plus adaptés pour l’élimination du P; (ii)Des expérie

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12

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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13

Kočicová, Pavla. "Syntéza biokeramických materiálů na bázi hydroxyapatitu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230738.

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The thesis deals with the precipitation synthesis of nanoparticle hydroxyapatite with goal to study the influence of reaction conditions on the morphology of the particles. The theoretical part is focused on biomaterials, bioceramics and phosphates characterization. Further the work is focused on hydroxyapatite, its characteristics and possible synthesis in particular. The synthesis of hydroxyapatite precipitation is described in the experimental part. Syntheses were performed at a reaction temperature of 0-80 °C at pH = 8-11, at the aging time of 0-24 h, in the presence of surfactant and the

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14

Bydell, Sofie. "Extension of the Benchmark Simulation Model no. 2 with a model for chemical precipitation of phosphorus." Thesis, Uppsala universitet, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-203454.

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At present, there are more than 2000 wastewater treatments plants (WWTPs) in Sweden. Emissions of nitrogen and phosphorus from these, do contribute to the eutrophication of the Baltic Sea and watercourses on a daily basis. To reduce emissions of phosphorus, the Swedish approach has for the last 50 years been to use chemical precipitation. Today, software is used to test and evaluate different strategies in WWTPs, this in order to improve the operation and get a holistic view over the process. One model that can be used to achieve a holistic view is the Benchmark Simulation Model No. 2 (BSM2).

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15

Naduvath, Anu Paul. "Removal and recovery of phosphorus from side-stream hydrolysis." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210715.

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The report formulates the experiments conducted to remove phosphorus from the return sludge wastewater subjected to side-stream hydrolysis. The experiments are conducted using the wastewater from the outlet of side-stream hydrolysis and is tested in a laboratory at the Duvbackens wastewater treatment plant in Gävle. Chemical precipitation is used in the experiments and displays remarkable results using magnesium chloride and calcium chloride as the precipitants. A successful removal rate of 79-99% is achieved through this method. The phosphate phosphorus content is chosen to be the criterion f

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16

Jones, Robert Garret. "Adsorption of As(V), As(III) and methyl arsenic by calcite and the impact of some groundwater species." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1674.

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17

Nugroho, Fadjari Lucia. "Contribution à l'étude de l'élimination des pollutions phosphorées dans les eaux résiduaires." Toulouse, INSA, 1990. http://www.theses.fr/1990ISAT0003.

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Le point de depart de cette etude est une analyse des mecanismes biologiques qui sont a la base des techniques de dephosphoration biologique. Cette 1ere phase debouche sur l'idee qu'il devrait etre interessant pour ameliorer la stabilite de ces procedes de passer par la formation d'un phosphate insoluble parmi lesquels nous avons selectionne la struvite nh#4mgpo#4. Ce schema semble realisable en utilisant une biomasse fixee sur un support capable de relarguer des ions mg#+#+ dans l'effluent a traiter. La 2eme partie de notre travail a consiste a rechercher un support convenable. Nous avons fin

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18

Sugano, Laura Sugano. "Comparing bioretention cell and green roof performance in Parma, OH." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1524338535227738.

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19

Zhao, Zhitong. "Effect of doping ions and organic molecules on the precipitation and biological interactions of nanostructured calcium phosphates." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/328719.

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From a chemical and structural point of view, hydroxyapatite (HA) is a strong candidate in biomedical applications owing to its similarity to the inorganic components of bones and teeth. HA nanoparticles (NPs) as colloidal suspensions are becoming a popular tool in biomedical applications such as gene/drug delivery, bio-imaging etc. Although it is widely acknowledged that ionic substitutions on bulk HA substrates have a strong impact on their biological performance, little is known of their effect on NPs with potential use in gene transfection or drug delivery. In the third chapter carbonate

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20

Esalah, Jamaleddin. "Removal of heavy metals from aqueous solutions by precipitation with sodium di-(n-octyl) phosphinate." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=37715.

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Two organophosphorus compounds: sodium di-(n-octyl) phosphinate and sodium di-(n-dodecyl) phosphinate, were synthesized and purified. Sodium di-(n-octyl) phosphinate was used both as a surfactant to form reverse micelles and as a precipitating agent to remove heavy metals from aqueous nitrate and chloride solutions.<br>The heavy metals lead, cadmium, and zinc were precipitated from aqueous solutions with sodium di-(n-octyl) phosphinate (NaL) in the form of PbL 2(s), CdL2(s), and ZnL2(s). The mole ratio of NaL to lead in the feed was varied from 0.1 to 6.5, depending on the acidity of the feed.

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21

Groleau, Alexis. "Precipitation de calcite, sedimentation et cycle du phosphore dans un lac alpin. Etude du lac du bourget." Marne-la-vallée, ENPC, 2000. http://www.theses.fr/2000ENPC0012.

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Cette these etudie l'interaction entre la formation et la sedimentation de la calcite authigene avec le cycle du phosphore dans la colonne d'eau du lac du bourget (france). Des campagnes de mesures ont ete menees pendant 2 ans sur le lac de maniere a decrire la dynamique biogeochimique spatio-temporelle de la phase particulaire et de la phase dissoute, integree dans le contexte physique du lac. Une nouvelle methode de quantification de la precipitation de calcite authigene basee sur la mesure in situ de la conductivite specifique a ete developpee. Elle permet : de detecter le demarrage d'une p

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22

VALENTE, MAGALI de C. "Sintese de hidroxiapatita e sua aplicacao como biomaterial." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10768.

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Made available in DSpace on 2014-10-09T12:43:48Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:09Z (GMT). No. of bitstreams: 1 06773.pdf: 7313261 bytes, checksum: afb0bc00fde188a0f75b9462245bb12d (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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23

Manas, Llamas Angela. "Immobilisation du phosphore par précipitation induite dans un procédé aérobie à biomasse granulaire." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0122/document.

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Depuis une dizaine d'années, les procédés de granulation aérobie sont apparus comme une technologie prometteuse pour le traitement des effluents fortement chargés en azote, phosphore et carbone, tels que ceux issus de l'agro-industrie. La complexité microbienne de ces granules et les mécanismes qui leur donnent des propriétés exceptionnelles de décantation et de cohésion, constituent encore des axes de recherche importants. Dans cette thèse, le travail s'est axé sur un mécanisme encore non étudié : les processus de précipitation des phosphates au cœur des granules microbiennes. Différentes tec

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24

Lescuyer, Hervé. "Genèse et dissolution d'inclusions non métalliques dans un métal liquide solvant de leurs constituants." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0044.

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Le diagramme de phase du systheme (al, si, alp) est determine experimentalement du cote riche en aluminium par filtration d'alliages liquides al-si contenant 0%, 13%, et 18% poids de silicium. La position du liquidus (al, alp) reste inchangee avec la teneur en silicium. La courbe de solubilite experimentale est validee en la reproduisant a l'aide de melanges (al, alp) purs. De plus, des valeurs identiques de solubilite du phosphore sont obtenues apres precipitation de l'alp ou apres dissolution de l'alp, ce qui montre la reversibilite de ces deux processus. Le calcul du coefficient d'activite

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25

Hanhoun, Mary. "Analyse et modélisation de la précipitation de struvite : vers le traitement d'effluents aqueux industriels." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0037/document.

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La réduction des apports phosphorés des eaux usées régie par la Directive Européenne de 1991 (91/271/EEC) est considérée comme le facteur clé de la lutte contre la pollution des rivières et des lacs. Ces travaux concernent exclusivement l'étude de la formation maîtrisée de struvite (MgNH4PO4.6H2O) par précipitation comme alternative originale de récupération du phosphore et, par voie de conséquence, de l'ammonium à partir d'eaux usées. Un atout de ce procédé concerne la valorisation du précipité en tant que fertilisant. Dans ce contexte général, l'objectif consiste à développer une démarche co

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26

Geraldes, Ana Maria. "Efeitos da ocupação do solo, do uso da água e da idade das albufeiras nos parâmetros ambientais e na estrutura das comunidades zooplanctónicas." Doctoral thesis, Universidade de Lisboa, Faculdade de Ciências, 2004. http://hdl.handle.net/10198/770.

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O presente trabalho decorreu em três albufeiras de idades distintas e sujeitas a diferentes tipos de perturbações de origem antropogénica. Estes sistemas aquáticos localizam-se na parte portuguesa da Bacia Hidrográfica do Rio Douro, na região de Trás-os-Montes. A albufeira da Serra Serrada foi criada em 1995 com o objectivo de abastecer de água a cidade de Bragança, actualmente com 34.750 habitantes. Como consequência do intenso consumo de água ocorrem flutuações de grande amplitude no seu nível. Por outro lado, na bacia de drenagem desta albufeira a pastorícia é particularmente intensa durant

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27

He, Jiun-mimg, and 何俊明. "Precipitation Removal of Phosphate from TFT-LCD Manufacturing Wastewater." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65599865910674242149.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>96<br>e etching wastewater from thin film transistor liquid crystal display (TFT-LCD) manufacturers contains high concentration of phosphate. The aim of this thesis was to investigate the feasibility of phosphate removal from TFT-LCD wastewater by precipitation with calcium and magnesium salts. Optimal operating conditions were determined. Besides , field-emission scanning electron microscope (FE-SEM) and X-ray diffraction (X-RD) were used in characterization of precipitates. Both pH value and molar ratio of metal to phosphate play important roles in precipitation of

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28

Vathakanon, Chuleeporn. "Pelletal phosphorite precipitation in Peru shelf mud." 1985. http://catalog.hathitrust.org/api/volumes/oclc/13957963.html.

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29

Olatuyi, Solomon Olalekan. "Chemical characterization of phosphate diffusion in a multi-ionic environment." Thesis, 2006. http://hdl.handle.net/1993/277.

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Low phosphate fertilizer efficiency in high pH soils is primarily due to the retardation of P movement in the soil-P fertilizer reaction zone. The objective of this study was to obtain fundamental information on the influence of multi-ionic interactions on the solubility and diffusion of P in columns containing a model soil system and two soil types. The study also aimed to identify the salt combinations and factors that have the potential to enhance the solubility and movement of P in calcareous soil condition. The results showed that the interaction of NH4+ and SO42- was consistent at enhan

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30

Lu, Chia-chen, and 呂佳成. "Phosphate Recovery from TFT-LCD Manufacturing Wastewater by a Hybrid Precipitation-Microfiltration." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/46852735522357681665.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>97<br>The etching wastewater from thin film transistor liquid crystal display (TFT-LCD) manufacturers contains high concentration of phosphate. The aim of this investigate was to study the feasibility of phosphate removal and recovery by a hybrid precipitation-microfiltration process. This study investigates phosphate removal efficiency and composition of precipitates using precipitation by calcium salts under optimum values of pH and Ca/PO4 molar ratios, followed by crossflow microfiltration (MF) for solid-liquid separation. The effects of operation conditions, such

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31

Lin, Bo-Guang, and 林柏光. "Characteristics of collagen-chitosan-calcium phosphate composite scaffolds by high efficiency perfusion co-precipitation process." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/18477228084413159781.

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碩士<br>國立陽明大學<br>口腔生物研究所<br>103<br>Collagen is the most abundant protein in mammals. It can promote cellular pro-liferation, differentiation, and appropriate biodegradability for new tissue regeneration. Collagen has amounts of advantages as a scaffold for tissue repair, however, the poor mechanical property of collagen jeopardizes its application for bone tissue engineering. Chitosan is widely used in tissue engineering due to antibacterial properties, low anti-genicity, good biocompatibility and controllable biodegradability. It can increase the amount of amine reaction sites and strengthen a

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32

Agyei, Nana Mensah. "The removal of phosphate ions from aqueous solution by fly ash, slag, ordinary Portland cement and related blends." Thesis, 2004. http://hdl.handle.net/2263/29682.

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33

Singh, Atmajeet. "Heat exchanger fouling by precipitation of calcium phosphates." Thesis, 1992. http://hdl.handle.net/2429/3057.

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The fouling characteristics of artificially hardened waters containing calcium and orthophosphate ions were investigated. The water was circulated through a steam heated double pipe heat exchanger under turbulent flow conditions. Inlet water temperatures were about 20 to 25°C and the phosphate content about 100 ppm. Experiments were carried out to ascertain the effects of pH, velocity, surface temperature and concentrations of the calcium and the orthophosphate on the fouling process. The fouling behaviour was recorded in terms of the fouling resistance-time curve which was calculated fr

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34

Martin, Grace Marion. "Nutrient sources for excessive growth of benthic algae in Lake Ontario as inferred by the distribution of SRP." Thesis, 2010. http://hdl.handle.net/10012/5640.

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Total phosphorus concentrations in the open waters of the Laurentian Great Lakes are currently at or beneath target concentrations set by international agreement. Despite the success of phosphorus loading controls in remediating nearshore eutrophication problems in the past, nuisance growth of Cladophora has recently returned to the lower Great Lakes. This thesis examines soluble reactive phosphorus (SRP) in a northwestern segment of Lake Ontario to assess whether allochthonous or autochthonous sources of phosphate lead to localized areas of PO43- enrichment that may help to explain the seem

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Hsiao, He-Hsuan. "Mass Spectrometric Analyses of Post-Translationally Modified Proteins." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-ADDD-D.

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