Phosphorus recovery from synthetic swine wastewater by chemical precipitation using response surface methodology.
With synthetic swine wastewater, central composite design using response surface methodology was employed to investigate the effects of pH value and concentrations of ammonium, phosphate, magnesium and calcium on phosphorous recovery. P recovery efficiency with the range of 53-99% was observed in the experimental runs. Results showed that magnesium ammonium phosphate were the only crystals, mixed with amorphous calcium precipitates, in the deposits. According to the regression quadratic model, the linear and quadratic terms of PO(4)(3-)-P and Mg had significant effects on the P recovery amount. With regard to the interaction terms, pH x NH(4)(+)-N, PO(4)(3-)-P x Mg, PO(4)(3-)-P x Ca and Mg x Ca showed significant influences. A maximum P recovery amount of 299.25 mg/L was achieved at optimized conditions with pH 9.7, NH(4)(+)-N 456 mg/L, PO(4)(3-)-P 300 mg/L, Mg(2+) 264 mg/L and Ca(2+) 59 mg/L, respectively.
Ye
Zhi-Long
ZL
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China.
Chen
Shao-Hua
SH
Wang
Shu-Mei
SM
Lin
Li-Feng
LF
Yan
Yi-Jun
YJ
Zhang
Zhao-Ji
ZJ
Chen
Jin-Sheng
JS
D000818:Animals; D000829:Animals, Domestic; D017610:Calcium Compounds; D011232:Chemical Precipitation; D007220:Industrial Waste / Q000517:prevention & control*; D017616:Magnesium Compounds; D010710:Phosphates; D010758:Phosphorus / Q000302:isolation & purification*; D000069877:Struvite; D013552:Swine; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D017610:Calcium Compounds; D007220:Industrial Waste; D017616:Magnesium Compounds; D010710:Phosphates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D000069877:Struvite