磷
污水污泥
浸出(土壤学)
废物管理
环境科学
污水处理
制浆造纸工业
环境工程
化学
工程类
土壤水分
土壤科学
有机化学
作者
Yuxiang Zhong,Guanting Liu,Xiao Yang
标识
DOI:10.1016/j.resconrec.2022.106815
摘要
Natural phosphorus resources are depleting. Phosphorus recovery from waste has become a strategic issue to address the potential threat of phosphorus shortage. Technologies to recycle phosphorus as fertilizers remain in limited applications due to cost and quality reasons. Here, we demonstrate sewage sludge ash as an appropriate resource to prepare elemental phosphorus. By leaching in molten CaCl2, PO43- in the ash can be set free and electrochemically split into elemental phosphorus and O2−. We identify two technical advantages of using sewage sludge ash. Metal cations released from the ash boost the leaching rate of PO43−, while SiO2 in the ash prevents the accumulation of O2- in the melt. Electrochemical isolation can keep most impurities in phosphorus within 1.00 ppm, far better than the industrialgrade commercial product. The estimated cost is less than 2 USD (kg-P)−1. This facile technology may contribute to closing the phosphorus loop for sustainable utilization.
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