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.
Results
Showing 1 to 20 of 24 for “"struvite precipitation"”.
-
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
-
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 …
-
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 …
-
Natural zeolitites in combination with struvite precipitation technology for the recovery of nutrients from agricultural wastewaters
… A promising 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 …
-
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 …
-
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. …
-
Microwave-based Pretreatment, Pathogen Fate and Microbial Population in a Dairy Manure Treatment System
Anaerobic digestion and struvite precipitation are two effective ways of treating dairy manure for recovering biogas and phosphorus. Anaerobic digestion of dairy manure is commonly limited by slow fiber degradation, while one of the limitations to struvite precipitation is the availability of …
-
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, …
-
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 …
-
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 …
-
Simplification of Complex WWTP Models into Simple Design and Evaluative WRRF Tool
… The bio-augmentation batch enhanced (BABE) and struvite precipitation SSTPs, and plant performance indices i.e., effluent quality and operational cost indices, EQI and OCI, respectively, were incorporated into PPET to analyse case studies on South African plants. It was found that there are …
-
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 …
-
Electrochemical water technologies for resource recovery using polymer electrolytes
… and nitrogen, 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 …
-
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 …
-
Evaluation of cost effective approaches for nutrient removal in urban stormwater and wastewater: City of Fort Collins case study
… ($/lb. removal) than the stormwater scenarios. Struvite precipitation in all MCDA scenarios is the most advantageous alternative, followed by ammonia stripping and extended detention basin (EDB) retrofits.
-
Rare Earth Elements (REEs) Recovery and Hydrochar Production from Hyperaccumulators
… A process that combines solvent extraction and struvite precipitation was developed for the treatment of biocrudes containing REEs and other elements. In the extraction step, 95.6% of REEs were extracted using 0.05 mol/L di(2-ethylhexyl)phosphoric acid (D2EHPA) with an aqueous to organic (A/O) …
-
Opportunities for Nutrient Recovery from Post-Digestion Sludge Handling: Analysis and Feasibility Study Using Municipal Scale Aerobic and Anaerobic Digesters
… of dissolved ammonia. The feasibility of struvite precipitation by addition of phosphate and magnesium compounds is evaluated through batch reaction using anaerobic sludge filtrate. Aerobic sludge contains most of the nutrient resources in the solid phase, ready for recovery if handled …
-
Anaerobic Digestion Steady State model parameter estimation for determination of waste activated sludge characteristics
… the ADL was not fully saturated, resulting in no struvite precipitation taking place. This was accurately modelled for both Maake & Ikumi, (2021) and Ikumi, Harding & Ekama, (2013) modelling scenarios.
-
Optimization of Phosphorus Removal and Mineral Characterization in Aerated Anaerobic Digestate with Divalent Cation Addition
Struvite and other minerals often form at WRRFs when phosphorus-rich activated sludge from EBPR processes undergo anaerobic digestion. Without proper control, these minerals can cause scale deposits that clog pipes and damage dewatering equipment. However, managing when and where these minerals …
-
Quantifying magnitude of potential phosphorus removal and recovery using plant-wide modeling
… in P removal and potential recovery as struvite. Full-scale WRRFs are modeled and simulated using hydromantis GPS-X software. The nutrient removal configurations considered are activated sludge (AS), activated sludge with ferric chloride chemical precipitation (AS_CP), modified Bardenpho …
Page 1 of 2