海藻酸钠固定硫酸盐还原菌、镍-铁纳米粒子生物微球对污水中Cd2+的去除  

Removal of Cd^(2+) in sewage by sodium alginate immobilized sulfate-reducing bacteria and nickel-iron nanoparticle biological microspheres

作　　者：何蕊 康志超 朱国鹏 王琪荣 于洪文 HE Rui;KANG Zhichao;ZHU Guopeng;WANG Qirong;YU Hongwen(College of Life Science and Technology,Changchun University of Science and Technology,Changchun 130022,China;Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun 130102,China)

机构地区：[1]长春理工大学生命科学技术学院,长春130022 [2]中国科学院东北地理与农业生态研究所,长春130102

出　　处：《环境工程学报》2022年第5期1480-1489,共10页Chinese Journal of Environmental Engineering

基　　金：黑土地保护与利用科技创新工程专项资助(XDA28010502);中国科学院科研仪器设备研制项目资助(YJKYYQ20200013);吉林省科技发展计划项目(20210203007SF)。

摘　　要：为寻求一种高效去除高浓度含Cd^(2+)废水的方法,本研究以海藻酸钠为载体固定硫酸盐还原菌(SRB)和镍铁双金属纳米粒子,制备了高效去除Cd^(2+)的活性生物微球(SSNF),并通过对比不同的固定化材料来探讨其对废水中高浓度Cd^(2+)的去除效果。通过改变镍-铁添加量,pH,反应时间,初始Cd^(2+)浓度探讨了SSNF去除Cd^(2+)的能力,并结合吸附动力学探究了SSNF对Cd^(2+)的去除过程及相关机制。结果表明,当镍-铁添加量为0.3 g、pH为7、反应时间5 d、Cd^(2+)初始浓度为400 mg·L^(−1)时,SSNF去除率可达到100%,吸附量为103.86 mg·g^(−1)。镍-铁对SRB去除Cd^(2+)具有明显的协同促进作用,且符合准二级动力学模型,以化学吸附作用为主,物理吸附为辅。离子交换或共价电子作用可能是SSNF吸附Cd^(2+)的主要机制。利用无菌生理盐水对活性生物微球进行洗涤,重复使用3次后,微球仍能保持较高的去除能力。该研究结果可为解决含有高浓度Cd^(2+)污染的废水问题提供技术参考。In order to find an efficient method to remove high-concentration Cd^(2+) contained in wastewater,sodium alginate was used as a carrier to immobilize sulfate-reducing bacteria(SRB)and nickel-iron bimetallic nanoparticles,and a type of active biological microspheres(SSNF)that can efficiently remove Cd^(2+) was prepared.Through the comparison of different immobilized materials,its effect on high-concentration Cd^(2+) removal from wastewater was explored.The Cd^(2+) removal ability by SSNF was discussed with the variations of the amount of ferronickel,pH,reaction time,and initial Cd^(2+) concentration,and the adsorption kinetics was combined to study the Cd^(2+) removal process and related mechanisms by SSNF.The results showed that when ferronickel addition was 0.3 g,pH=7,reaction time was 5 d,and Cd^(2+) initial concentration was 400 mg·L^(−1),Cd^(2+) removal rate by SSNF reached 100%with the adsorption capacity of 103.86 mg·g^(−1).Ferronickel has an obvious synergistic promotion effect on Cd^(2+) removal by SRB,and it conforms to the quasi-second-order kinetic model,and was dominated by chemical adsorption with physical adsorption as supplement.Ion exchange or covalent electron interaction may be the main mechanism for Cd^(2+) adsorption onto SSNF.The research results can provide a technical reference for solving the problem of high concentration-Cd^(2+) wastewater treatment.

关 键 词：固定化 硫酸盐还原菌 镍铁双金属纳米粒子 生物微球 Cd^(2+)废水 

分 类 号：X703.1[环境科学与工程—环境工程]