复合改性污泥生物炭对Mn^(2+)的吸附研究  

Adsorption of Mn^(2+)by composite modified sludge biochar

作　　者：鲍福星 岳正波[1,2] 高义军 王绍平 揣新 吴文涛 BAO Fuxing;YUE Zhengbo;GAO Yijun;WANG Shaoping;CHUAI Xin;WU Wentao(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes,Hefei 230009,China;Nanshan Mining Co.,Ltd.,Anhui Masteel Mining Resources Group,Ma’anshan 243000,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]纳米矿物与污染控制安徽普通高校重点实验室,安徽合肥230009 [3]安徽马钢矿业资源集团南山矿业有限责任公司,安徽马鞍山243000

出　　处：《合肥工业大学学报（自然科学版）》2023年第10期1322-1330,共9页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金区域创新发展联合基金资助项目(U19A20108)。

摘　　要：针对含锰(Mn^(2+))废水处理与城市污水处理厂污泥的安全处理处置问题,文章将合肥市某污水处理厂污泥在CO_(2)气氛和550℃条件下进行热解,并用3 mol/L KOH进行改性,制备得到复合改性污泥生物炭(composite modified sludge biochar,CMSB),并将其用于含Mn^(2+)废水处理。实验结果表明,CMSB在pH=4、投加量为1.0 g/L时,对Mn^(2+)的吸附量可达37.63 mg/g。CMSB对Mn^(2+)的吸附行为可以很好地通过准二级动力学模型和Langmuir等温线模型拟合,热力学分析结果表明吸附过程是自发、吸热、熵增的,主要吸附机制包括含氧官能团络合、π键作用、静电吸引及阳离子交换。研究结果可为城市污水处理厂污泥的安全处置和含Mn^(2+)废水处理提供技术支持和理论基础。Aiming at the problem of the manganese(Mn^(2+))-containing wastewater treatment and the safe treatment and disposal of sludge in municipal sewage treatment plants,the sludge of a sewage treatment plant in Hefei City was pyrolyzed under CO_(2) atmosphere and 550℃,and modified with 3 mol/L KOH.Composite modified sludge biochar(CMSB)was prepared and used for the treatment of Mn^(2+)-containing wastewater.The experimental results show that the adsorption capacity of Mn^(2+)can reach 37.63 mg/g at a pH value of 4 and a dosage of 1.0 g/L of CMSB.The adsorption behavior of Mn^(2+)by CMSB can be well fitted by the quasi-second-order kinetic model and the Langmuir isotherm model.The thermodynamic analysis results show that the adsorption process is spontaneous,endothermic and entropic.The main adsorption mechanisms include the complexation of oxygen-containing functional groups,π-bond,electrostatic attraction and cation exchange.The research results can provide technical support and theoretical basis for the safe disposal of sludge and the treatment of wastewater containing Mn^(2+)in municipal sewage treatment plants.

关 键 词：污泥生物炭 复合改性 热解 吸附 含锰废水 

分 类 号：X705[环境科学与工程—环境工程] X703.1