Effect of H2S gaseous substrate on sludge bioleaching treatment efficiency

被引：0

作者：

Chang Z. ^{[1
,2
]}

Zhang C. ^{[1
]}

Su B. ^{[1
,2
]}

Zhang C. ^{[1
]}

Wang J. ^{[1
,2
]}

Quan X. ^{[1
,2
]}

机构：

[1] School of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi, Taiyuan

[2] Municipal Engineering Graduate Education Innovation Center of Shanxi Province, Shanxi, Taiyuan

[3] Shanxi Province Installation Group Co., Ltd., Shanxi, Taiyuan

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 05期

关键词：

bioleaching; community diversity; dewaterability; heavy metal; hydrogen sulfide; sludge treatment;

D O I：

10.16085/j.issn.1000-6613.2022-1348

中图分类号：

学科分类号：

摘要：

H2S was used as the partially alternative nutrient substrate for sludge bioleaching, and the effects of H2S load on bioleaching treatment efficiency and community diversity were studied. The changes of pH, ORP, heavy metal removal rate and CST were examined, and the community diversity was analyzed. The results showed that H2S load of 50mL/L with gas flow of 2mL/min could significantly accelerate the bioleaching process, improve the decline rate of pH and maintain a higher oxidation-reduction potential in the sludge system. The addition of H2S improved dewaterability with CST shortened by 35.8s, had significant effects on heavy metal leaching with the removal rate of Ni, Pb, and Cr increasing by 18.35%, 21.22%, and 13.07% respectively, and promoted the conversion of various heavy metal forms to the easily soluble state. The SEM results showed that H2S promoted the reproduction of dominant microflora and made the sludge particles larger and compact. High-throughput sequencing showed that the addition of H2S gaseous substrate strengthened the efficiency of sludge bioleaching treatment, accelerated the trend reducing the number of species, microflora abundance and community diversity in the sludge system, and promoted Proteobacteria as the dominant phylum and Acidithiobacillu as the dominant genus. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：2733 / 2743

页数：10

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