Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China.
J Hazard Mater. 2010 Apr 15;176(1-3):1083-8. doi: 10.1016/j.jhazmat.2009.10.129. Epub 2009 Nov 10.
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.
采用合成猪废水，利用响应面法中的中心复合设计研究了 pH 值以及铵、磷、镁和钙浓度对磷回收的影响。在实验过程中观察到磷的回收率在 53-99%的范围内。结果表明，沉淀物中只有磷酸镁铵盐与无定形的钙沉淀物混合。根据回归二次模型，PO(4)(3-)-P 和 Mg 的线性和二次项对磷回收量有显著影响。就相互作用项而言，pH x NH(4)(+)-N、PO(4)(3-)-P x Mg、PO(4)(3-)-P x Ca 和 Mg x Ca 有显著影响。在优化条件下，当 pH 值为 9.7、NH(4)(+)-N 为 456 mg/L、PO(4)(3-)-P 为 300 mg/L、Mg(2+)为 264 mg/L、Ca(2+)为 59 mg/L 时，可实现最大的磷回收量 299.25 mg/L。
