Struvite Precipitation From Source Separated Urine

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Nutrient recovery from Urine is an effective strategy for resource recovery and to addressrnenvironmental problems, such as environmental eutrophication in surface waters, caused by nitrogenrnand phosphorus contained in wastewater. The aim of this study was to recover nutrients (NPK) byrnstudy addresses/optimizing the above mentioned factors affecting struvite (MgNH4PO4•6H2O)rnprecipitation from source separated human urine. The recommended set of factors and theirrninteractions were optimized. There were about 41 experiments taken place to optimize thernrecommended set of factors affecting the precipitation of struvite, which include: pH (8,9,10,11,12,13),rnstorage period 1,2,3,4,5 week), precipitation period (1,2,3,4,5,6 hrs), stirring speed (60 RPM to 210rnRPM in 30 RPM interval) and stirring period (0,5,10,15 minutes), were done. All these factors werernoptimized in order to precipitate struvite with high quality and quantity. The result showed thatrnprecipitation of struvite from source separated urine is affected by many factors. The optimumrncondition for higher quality of struvite production were obtained at pH of 10, storage period of 4rnweeks, M of MgCl2 with 400 ml volume, stirring speed of 165 RPM, stirring period of 10 min., andrnprecipitation period of 4 hours are optimum according to this study. The factors; pH, MgCl-PO4rnration, and urine storage time are key factors for struvite precipitation. The study conclude thatrnfacilitates Struvite formation in urine is a fast and relatively easy process: the addition of magnesiumrnactivates the precipitation without any noticeable lag phase that can be applied as a slow releasernfertilizer.

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Struvite Precipitation From Source Separated Urine

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