混凝污泥的资源化回收及其电化学性能  

Recovery of coagulated sludge and its electrochemical performance

作　　者：侯蓉 曹志钦 赵赫[2] 宁静恒 孟晓飞 孙姗姗 Rong HOU;Zhiqin CAO;He ZHAO;Jingheng NING;Xiaofei MENG;Shanshan SUN(School of Chemistry and Food Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China;Beijing Engineering Research Center of Process Pollution Control,Key Laboratory of Green Process and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical&Environment Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]长沙理工大学化学与食品工程学院,湖南长沙410114 [2]中国科学院过程工程研究所绿色过程与工程院重点实验室,北京市过程污染控制中心,北京100190 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《过程工程学报》2019年第6期1234-1241,共8页The Chinese Journal of Process Engineering

基　　金：国家水体污染控制与治理科技重大专项资助项目(编号：2015ZX07202-013);中国科学院青年创新促进会资助项目(编号：CAS 2014037)

摘　　要：将混凝污泥碳化后制成电极材料,通过红外光谱和X射线衍射对污泥的官能团结构与晶型进行表征,采用循环伏安和线性扫描伏安法研究不同碳化温度下所制电极材料的电化学性能,并应用于电芬顿体系催化降解双酚A。结果表明,混凝污泥的主要成分为含碳和铁元素的复合物,高温碳化后污泥的结晶度增强。所制电极在电芬顿体系中显示出良好的电催化活性。外部投加Fe2+条件下,经900℃碳化的电极材料为阴极对双酚A的去除率最高,电解130 min后去除率高达99.2%。表明在电化学芬顿法废水处理中有一定的应用前景。The resource utilization of coagulated sludge has a strong application potential. In this work, the actual coagulated sludge was recycled and carbonized at different temperatures to prepare electrode materials. The functional group structure and crystal form of sludge materials were characterized by Fourier transform infrared spectroscopy(FT-IR) and X-ray diffraction(XRD). The electrochemical properties of sludge electrode materials carbonized at different temperatures were studied by cyclic voltammetry(CV) and linear sweep voltammetry(LSV), and their electrocatalytic activities were evaluated and compared. Coagulated sludge treated by carbonization at high temperature was efficiently recovered and reused as high-performance cathode in electrochemical field, which was applied to the catalytic degradation of bisphenol A(BPA) in the Electro-Fenton system. The results showed that the main composition of coagulated sludge was carbon-iron complex, the crystallinity of sludge increased after carbonization at high temperature. According to evaluation by electrochemical characterization, the sludge treated by carbonization had a good hydrogen peroxide(H2 O2) selectivity and yield. The selectivity of sludge electrodes carbonized at different temperatures for hydrogen peroxide in oxygen reduction reaction(ORR) process was more than 38%, the carbonized sludge presented a more rigorous two-electron transfer pathway and increased H2O2 selectivity. The removal rate of BPA increased by carbonized sludge material. Especially, coagulated sludge carbonized at 900 ℃ achieved 99.2% BPA removal in 130 min under the condition of adding Fe2+, due to its highly active two-electron reduction of oxygen(O2). The kinetics of BPA degradation by sludge material electrode was fitted, it was found that the kinetics of pollutant removal accorded with the first-order kinetics. The electrochemical characteristics of carbonized sludge electrode materials showed the possibility of their application in wastewater treatment by Electro-Fenton process

关 键 词：混凝污泥 回收 电芬顿体系 

分 类 号：X751[环境科学与工程—环境工程]