School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, People's Republic of China.
School of Environment, Nanjing Normal University, Nanjing, Jiangsu 210023, People's Republic of China; Jiangsu Engineering Lab of Water and Soil Eco-remediation, Nanjing Normal University, Nanjing, Jiangsu 210023, People's Republic of China.
Bioresour Technol. 2019 Apr;278:266-271. doi: 10.1016/j.biortech.2019.01.094. Epub 2019 Jan 23.
Phosphorus release and recovery from Fe-based chemically enhanced primary sedimentation (CEPS) sludge via alkaline fermentation was investigated. The coagulation results showed that 78% of organic matter and 95% of phosphorus were concentrated from sewage into sludge with the optimum dosages of 25 mg/L FeCl. The batch fermentation results revealed that 69.35% of the phosphorus in the Fe-sludge can be released and the maximum phosphorus concentration was 20.57 mg/L at pH 11. In the recovery stage, 90% of the P released in the fermented sludge supernatant was precipitated at a 2:1 ratio of magnesium to phosphorus and pH 11. The result of X-ray diffraction indicated that magnesium ammonium phosphate (MAP) was the major component of the precipitated solids. Thus, the present study provides an alternative option for phosphorus release and recovery as MAP from CEPS sludge via alkaline fermentation.
通过碱性发酵从基于铁的化学增强一级沉淀（CEPS）污泥中释放和回收磷的研究。混凝结果表明，在最佳剂量 25mg/LFeCl 的条件下，污水中有 78%的有机物和 95%的磷被浓缩到污泥中。分批发酵结果表明，铁污泥中 69.35%的磷可以被释放出来，在 pH 值为 11 时磷的最大浓度为 20.57mg/L。在回收阶段，在发酵污泥上清液中释放的磷以镁磷比为 2:1 和 pH 值为 11 的条件下沉淀，有 90%被沉淀出来。X 射线衍射的结果表明，沉淀固体的主要成分是磷酸铵镁（MAP）。因此，本研究为通过碱性发酵从 CEPS 污泥中以 MAP 的形式释放和回收磷提供了一种替代选择。
