铝牺牲电极改性污泥生物炭吸附废水中磷酸盐机理研究  

Adsorption mechanism of phosphate from wastewater by aluminum-sacrificial electrode modified sludge biochar

作　　者：祝采莹 黄海明 欧阳铸 陶乐瑶 曹露 丁丽 李林隆 ZHU Caiying;HUANG Haiming;OUYANG Zhu;TAO Leyao;CAO Lu;DING Li;LI Linlong(School of Environmental and Civil Engineering,Dongguan University of Technology,Dongguan 523808;Shenzhen Qinglan Engineering Consulting Co.,Ltd.,Shenzhen 518000)

机构地区：[1]东莞理工学院生态环境与建筑工程学院,东莞523808 [2]深圳市清蓝工程咨询有限公司,深圳518000

出　　处：《环境科学学报》2024年第6期51-60,共10页Acta Scientiae Circumstantiae

基　　金：广东省基础与应用基础研究基金杰出青年项目(No.2021B1515020099);国家自然科学基金项目(No.42277233)。

摘　　要：采用3种不同Al牺牲电极改性方法,以市政剩余污泥为基质制备可用于磷酸盐吸附的污泥生物炭.研究结果表明,Al牺牲电极改性污泥生物炭对磷酸盐的吸附容量依次为:碱活化Al牺牲电极改性污泥基生物炭(KEAC600)> Al牺牲电极改性污泥基生物炭(EAC600)>酸活化Al牺牲电极改性污泥基生物炭(SEAC600).KEAC600最大磷酸盐吸附容量为213.42 mg·g^(-1),是EAC600(96.70 mg·g^(-1))的2.21倍和SEAC600(86.30 mg·g^(-1))的2.47倍.FTIR、XRD、BET、SEM及零点电位等表征分析表明,Al牺牲电极改性污泥生物炭对磷酸盐的吸附机理主要包括静电吸附、配体交换和化学沉淀.该研究结果可为剩余污泥的处置和磷回收提供技术和理论参考.This study used three different methods of modifying sludge biochar composite using Al sacrificial electrode,aiming to enhance phosphate adsorption capacity while using municipal surplus sludge as the substrate.The research results indicate that the phosphate adsorption capacity of the composite material follows the order:alkali activated Al sacrificial electrode modified sludge-based biochar(KEAC600)>Al sacrificial electrode modified sludge-based biochar(EAC600)>acidified Al sacrificial electrode modified sludge based biochar(SEAC600).The maximum phosphate adsorption capacity of KEAC600 is 213.42 mg·g^(-1),which is 2.21 times higher than EAC600(96.70 mg·g^(-1))and 2.47 times higher than SEAC600(86.30 mg·g^(-1)).FTIR,XRD,BET,SEM,and zero potential characterization analysis indicate that the adsorption mechanism of Al sacrificial electrode modified sludge biochar composite material for phosphate mainly includes electrostatic adsorption,ligand exchange,and chemical precipitation.The research results can provide technical and theoretical references for both the disposal of excess sludge and phosphorus recovery.

关 键 词：污泥生物炭 Al牺牲电极 吸附 磷酸盐 

分 类 号：X703.1[环境科学与工程—环境工程]