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Bioresour Technol

Title:		Optimization of struvite crystallization protocol for pretreating the swine wastewater and its impact on subsequent anaerobic biodegradation of pollutants
Author(s):		Zhang DM; Chen YX; Jilani G; Wu WX; Liu WL; Han ZY;
Address:		"Ministry of Agriculture Key Laboratory of Non-point Source Pollution Control, Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310058, PR China"
Journal Title:		Bioresour Technol
Year:		2012
Volume:		20120406
Issue:
Page Number:		386 - 395
DOI:		10.1016/j.biortech.2012.03.107
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"Higher contents of NH(4)(+) and SS in wastewater hamper the anaerobic digestion; necessitating its pretreatment to reduce them. This study reveals optimization of struvite/MAP precipitation protocol followed by anaerobic digestion of pretreated swine wastewater for pollutants removal. Levels of different treatments: stirring speeds, 400 and 160 rpm; pH values, 9.0, 9.5, 10.0, 10.5, 11.0 and 11.5; and P:Mg:N ratios, 1:1:1.2, 1:1:1.7, 1:1:2.2, 1:1:2.7, 1:1:4.0 and 1:1:5.0 were evaluated for MAP crystallization. Among various combinations, protocol comprising of initial 10 min stirring at 400 rpm followed by 160 rpm for 30 min, pH 10.0, and P:Mg:N ratio 1:1:1.2 rendered the best removal efficiency for NH(4)(+), PO(4)(3-), COD, TC and TOC. Subsequent anaerobic biodegradation revealed superiority of MAP supernatant over raw swine wastewater for methane yield and NH(4)(+)-N, PO(4)(3-)-P, COD, TC and TOC removals. It suggests that struvite precipitation as pretreatment to anaerobic digestion is highly effective and advantageous in wastewater treatment"
Keywords:		"Ammonia/analysis Anaerobiosis Animals Biodegradation, Environmental Biofuels/analysis Biological Oxygen Demand Analysis Carbon/isolation & purification Chemical Precipitation Crystallization Hydrogen-Ion Concentration Magnesium/analysis Magnesium Compound;"
Notes:		"MedlineZhang, Dong-mei Chen, Ying-xu Jilani, Ghulam Wu, Wei-xiang Liu, Wen-li Han, Zhi-ying eng Research Support, Non-U.S. Gov't England 2012/04/28 Bioresour Technol. 2012 Jul; 116:386-95. doi: 10.1016/j.biortech.2012.03.107. Epub 2012 Apr 6"