污水处理领域磷回收技术及其应用

介绍了国内外从污水中磷回收研究与应用现状,多以含磷丰富的污泥脱水上清液、厌氧污泥消化液以及富磷废水为磷源,鸟粪石、磷酸钙等沉淀是目前广泛采用的回收形式。简述污水处理领域的磷回收技术有沉淀法,结晶法,电渗析法、离子交换等。沉淀法中鸟粪石、磷酸钙等的研究相对较为成熟,应用较多。最后展望了我国污水处理领域磷回收前景,2005年我国污水中的磷量相当于2000年全国磷矿开采量的42.7%,具有广泛的回收前景和环境经济效益。

Phosphorus recovery techniques and their applications in wastewater treatment

Research and applications of the phosphorus recovery techniques at home and abroad were reviewed.The supernate of sludge dewatering which has abundant phosphorus,the digested liquid of anaerobic sludge and other wastewater of phosphorus are the main sources of phosphorus,and the struvite and calcium phosphate sedimentation are the main recovery matters.The phosphorus recovery techniques,such as sedimentation,crystallization,electrodialysis,ion exchange were presented.The study on struvite and calcium phosphate,which has been applied extensively,is thorough as compared with studies on other sedimentation methods.The phosphorus recovery techniques in wastewater treatment in China were prospected.The quantity of phosphorus in wastewater in 2005 corresponds to 42.7% of the total phosphorus output in 2000,so it is potential to recover phosphorus from wastewater with environmental and ecological benefits in China.