Investigation on mechanism of phosphate removal on carbonized sludge adsorbent

查看全文 作　　者：Lei [1,2]Zhang;Junxin [1,2]Liu;Xuesong [1]Guo

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;[2]University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Environmental Sciences》索引2018年第30卷第2期,共10页

基　　金：financially supported by the National Key R&D Program of China(No.2016YFC0400804) 摘　　要：For the removal of phosphate(PO_4^(3-)) from water, an adsorbent was prepared via carbonization of sewage sludge from a wastewater treatment plant: carbonized sludge adsorbent(CSA). The mechanism of phosphate removal was determined after studying the structure and chemical properties of the CSA and its influence on phosphate removal. The results demonstrate that phosphate adsorption by the CSA can be fitted with the pseudo second-order kinetics and Langmuir isotherm models, indicating that the adsorption is single molecular layer adsorption dominated by chemical reaction. The active sites binding phosphate on the surface are composed of mineral particles containing Si/Ca/Al/Fe. The mineral containing Ca, calcite, is the main factor responsible for phosphate removal. The phosphate removal mechanism is a complex process including crystallization via the interaction between Ca^(2+) and PO_4^(3-); formation of precipitates of Ca^(2+), Al^(3+), and PO_4^(3-); and adsorption of PO_4^(3-)on some recalcitrant oxides composed of Si/Al/Fe. 关键词：污水污泥磷酸盐吸附物移动机制碳化 CA2+ 等温线模型

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Investigation on mechanism of phosphate removal on carbonized sludge adsorbent

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