Treatment of Agate Dyeing Wastewater Using an Immobilized Gel Mixture with Nano-Fe_(3)O_(4) Sulfate-Reducing Bacteria  

作　　者：Xuying Guo Guoliang Jiang Saiou Fu Zhiyong Hu Junzhen Di Yanrong Dong Ying Li 

机构地区：[1]College of Science,Liaoning Technical University,Fuxin,123000,China [2]College of Construction Engineering,Liaoning Technical University,Fuxin,123000,China [3]College of Mining Engineering,Liaoning Technical University,Fuxin,123000,China [4]Liaoning Fourth Geological Team Limited Liability Company,Fuxin,123000,China

出　　处：《Journal of Renewable Materials》2021年第11期2015-2032,共18页可再生材料杂志（英文）

基　　金：funded by the National Natural Science Foundation of China(41672247,41102157,51304114);Liaoning Provincial Natural Science Foundation of China(2015020619);and Liaoning Provincial Department of Education(LJYL031,LJ2017FAL016);the project was supported by the discipline innovation team of Liaoning Technical University(LNTU20TD-21).

摘　　要：To solve the problems of high Cr^(6+),Cr^(3+),SO_(4)^(2-)and H+concentrations,pollution and processing costs associated with agate dyeing industrial drainage,we prepared an immobilized gel mixture for the treatment of such drainage on the basis of microbial immobilization technology.The immobilized gel mixture was composed of sulfate-reducing bacteria(SRB),corn cob,and nano-Fe_(3)O_(4)(nFe_(3)O_(4)).We used a single-factor experiment to determine the optimal dose of each matrix component.We analyzed the mechanism underlying the treatment of agate dyeing wastewater with an immobilized gel mixture by X-ray diffraction and scanning electron microscopy detection.The results of the single-factor test showed that the best treatment was obtained under the following conditions for each matrix component:SRB mass percentage of 30%,nFe_(3)O_(4) dose of 3%,and corn cob mesh size of 100 and dose of 3%.On this basis,we conducted an L9(34)orthogonal experiment to determine the optimal proportion of each matrix component.The results showed that the best treatment was obtained when the gel mixture met the following conditions:SRB mass percentage of 40%,nFe_(3)O_(4) dose of 4%,and corn cob dose of 1%and mesh size of 100.Accordingly,the SO_(4)^(2-),Cr^(6+)and Cr^(3+)removal rates from the agate dyeing drainage were 70.54%,84.75%,and 73.80%,respectively;the total Fe and chemical oxygen demand releases were 1.086 mg·L^(-1)and 1104 mg·L^(-1),respectively;and the pH was 6.27.The gel mixture had the best treatment effect on agate dyeing wastewater under this composition ratio.

关 键 词：Agate dyeing drainage corn cob immobilized gel mixture nano-Fe_(3)O_(4) orthogonal test sulfate-reducing bacteria 

分 类 号：X70[环境科学与工程—环境工程]