Heterotrophic microorganism Rhodotorula mucilaginosa R30 improves tannery sludge bioleaching through elevating dissolved CO2 and extracellular polymeric substances levels in bioleach solution as well as scavenging toxic DOM to Acidithiobacillus species

Water Research
Shi-mei WangLixiang Zhou

Abstract

The introduction of acid-tolerant heterotrophic microorganisms into sludge bioleaching systems has been proven effective in improving sludge bioleaching processes, and such positive effect is mainly attributed to the biodegradation of low molecular weight organic acids or sludge dissolved organic matter (DOM) toxic to Acidithiobacillus species by the heterotrophic microorganisms introduced. Here we report that elevated dissolved CO(2) concentration and resulting extracellular polymeric substances (EPS) in bioleach solution due to the incorporation of heterotrophic microorganisms also play important roles in improving sludge bioleaching. It was found that in tannery sludge bioleaching system coinoculated with Rhodotorula mucilaginosa R30 and Acidithiobacillus species, dissolved CO(2) concentration in bioleach solution can be elevated from 0.23-0.54 mg/L to 0.76-1.01 mg/L compared to the control inoculated only with Acidithiobacillus species. Correspondingly, the distinct degradation of sludge DOM was also observed in this experiment. It was experimentally demonstrated that the accumulation of CO(2) did greatly enhance the growth of Acidithiobacillus thiooxidans and the decrease rate of pH in the medium. In addition, EPS derived ...Continue Reading

Citations

Aug 25, 2015·Applied Microbiology and Biotechnology·Linshuai LiRuiqin Zhang
Apr 3, 2016·Applied Microbiology and Biotechnology·Shiladitya GhoshPinaki Bhattacharya
Jul 18, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Qingfang ZhangZengye Yang
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Oct 30, 2019·The Journal of Microbiology·Rajendra SinghSi Wouk Kim
Oct 3, 2021·Environmental Science and Pollution Research International·Yulan LuYu Dai

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