Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 50 for “"Struvite"”.
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Kinetics based characterization of struvite dissolution
… technology well known in the field of struvite precipitation for plants equipped with enhanced biological phosphorus removal (EBPR). By feeding anaerobically digested EBPR sludge to the Pearl and dosing Mg, struvite precipitation is induced for high rates of P removal. However, one …
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Phosphate precipitation as struvite from municipality wastewater
… of precipitating phosphate in the form of struvite (MgNH4PO4.6H2O) from the Tshwane Municipality dewatering liquors and consequently recovering it as a valuable and marketable product. The project was investigated in three sequential stages consisting of: 1. An aqueous thermodynamic …
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Optimization of Struvite Recovery Utilizing Magnesium Oxide
… and sodium hydroxide (NaOH) used for sidestream struvite recovery from anaerobically digested supernatant (centrate) through the Pearl® process. MgO is produced from magnesite (MgCO3) calcination, and different calcination conditions can alter the quality and characteristics of the MgO product. …
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Understanding the impact of chemical additives on struvite precipitation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Investigating pretreatment methods for struvite precipitation in liquid dairy manure
… wastewater treatment regulations. P recovery as struvite (MgNH4PO4·6H2O) is a promising technology because it can be used as a slow-release fertilizer. The objective of this study was to investigate different pretreatment methods to enhance struvite precipitation in dairy manure. Generally there …
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Struvite Recovery From Source-Separated Urine Utilizing Fluidized Bed Technology
… recovery, in the form of 99.9% pure struvite (MgNH4PO4•6H2O), has been demonstrated successfully in full-scale sidestream treatment using dewatering liquor from anaerobically digested solids (centrate) processed through upflow fluidized bed reactor technologies (Britton et al. 2005). …
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Bench-scale two-dimensional fluidized bed hydrodynamics and struvite growth studies
… of hydrodynamic behavior of fluidization of struvite pellets were performed. Also size growth distribution tests were analyzed qualitatively. The study validated a previously-proposed theory, concerning the relationship between dynamic pressure drop and upflow velocity as well the …
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Concentration and extraction of phosphorus from swine manure slurries as struvite
… was to address the application of dedicated struvite reactors for full-scale pork production operations by: (1) Investigating a method that quickly identifies maximum struvite precipitation, accounting for real-time variations of magnesium demand within the manure slurries. (2) Developing and …
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An investigation of improvements to electrochemical precipitation of struvite from source separated urine
… from urine or water-borne sewage is through struvite precipitation. Struvite (MgNH₄PO₄. 6H₂O) is a mineral that can be used as a slowrelease magnesium, ammonium and phosphate based fertilizer and can be produced from urine by adding magnesium to the ammonium and phosphate rich urine. Usually, …
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Evaluation of struvite leaching potential relative to monoammonium phosphate through field and soil column trials
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Evaluation of the Feasibility of Struvite Precipitation from Domestic Wastewater as an Alternative Phosphorus Fertilizer Resource
… Recovering phosphorus from wastewater with struvite precipitation systems at wastewater treatment plants can alleviate future phosphorus scarcities. Evaluation of phosphorus recovery through struvite precipitation at wastewater treatment plants and a determination of the ability for the …
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Natural zeolitites in combination with struvite precipitation technology for the recovery of nutrients from agricultural wastewaters
… technology consists in the precipitation of struvite crystals for the recovery of both nitrogen (N) and phosphorous (P). But, even if these processes are starting to scale up at industrial levels, the unbalance between the struvite components in wastewaters, as Mg2+, NH4+ and PO43-, remains …
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Understanding the limits of struvite based phosphorus recovery through mechanistic modelling and data-driven performance evaluations
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Understanding the impacts of supersaturation and seed crystal loading on struvite precipitation kinetics and collection efficiency
… of full-scale phosphorus removal with struvite precipitation processes is increasing. Utilities are increasingly understanding the necessity for higher levels of nutrient removal due to the regulatory pressures and the up and coming stringent discharge limits. To subsidize some of the …
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Exploring Forward Osmosis Systems for Recovery of Nutrients and Water
… and investigated for in-situ formation of struvite from digested swine wastewater. This FO system took advantage of a drawback reverse solute flux (RSF) and used the reversed-fluxed Mg^{2+} for struvite precipitation, thereby accomplishing recovery of both water and nutrient. With 0.5 M …
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The role of struvite crystals and the necrobiome in estimating the postmortem interval for forensic investigations in the UK
… Kingdom (UK). Research in the UK has highlighted struvite crystal precipitation as a potential preliminary method for estimating the postmortem interval (PMI). The aim of this research was to investigate the use of struvite crystals and the microbial communities that precipitate them in estimating …
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Prediction of struvite formation potential in Ebpr digested sludge using mass balances, batch precipitation tests, and chemical equilibrium modeling
… treatment process have the potential to form struvite (MgNH4PO4·6H 2O). The potential can be determined by the concentrations of struvite constituents including phosphorus, ammonium, and magnesium. Phosphorus concentration of digested sludge liquors is expected to increase when EBPR is …
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Electrochemical water technologies for resource recovery using polymer electrolytes
… which can be separated by precipitation as struvite. However, work is needed to transition from chemical precipitation of nutrients to electrochemical precipitation, especially at a wide range of pH values. For water electrolysis, new anion exchange materials need to be developed with both …
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A technological, economic and social exploration of phosphate recovery from centralised sewage treatment in a transitioning economy context
… recovery technologies that produce high quality struvite for use in food production do exist. However, there is little evidence to indicate that similar phosphate recovery techniques would be economically viable or socially accepted in South Africa. Therefore, this dissertation sets out to …
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Introducing loop-closure for phosphates into a provincial development strategy: An analysis of overlaps of primary and secondary phosphate processing technologies
… was introduced into the processes in the form of struvite recovered from sanitation infrastructure. Secondly, a socio-economic assessment was carried out. This involved a cost analysis of implementing a reverse logistics network that collects urine from non-sewer-served areas, processes it into …
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