Effects of sulfate on simultaneous nitrate and selenate removal in a hydrogen-based membrane biofilm reactor for groundwater treatment: Performance and biofilm microbial ecology

被引：38

作者：

Zhou, Lijie ^{[1
]}

Xu, Xiaoyin ^{[2
]}

Xia, Siqing ^{[2
]}

机构：

[1] Shenzhen Univ, Coll Chem & Environm Engn, Shenzhen 518060, Peoples R China

[2] Tongji Univ, Coll Environm Sci & Engn, Shanghai Inst Pollut Control & Ecol Secur, State Key Lab Pollut Control & Resource Reuse, 1239 Siping Rd, Shanghai 200092, Peoples R China

来源：

CHEMOSPHERE | 2018年 / 211卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen-based membrane biofilm reactor; Sulfate; Simultaneous nitrate and selenate degradation; Desulfovibrionaceae; Hydrogen oxidation; OXIDIZED CONTAMINANTS; AQUEOUS-SOLUTIONS; BIO-REDUCTION; SELENIUM; WATER; BIOREDUCTION; PERCHLORATE; DENITRIFICATION; SEQUESTRATION; HYDROXIDE;

D O I：

10.1016/j.chemosphere.2018.07.092

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Effects of sulfate on simultaneous nitrate and selenate removal in a hydrogen-based membrane biofilm reactor (MBfR) for groundwater treatment was identified with performance and biofilm microbial ecology. In whole operation, MBfR had almost 100% removal of nitration even with 50 mg mL(-1) sulfate. Moreover, selenate degradation increased from 95% to approximate 100% with sulfate addition, indicating that sulfate had no obvious effects on nitrate degradation, and even partly promoted selenate removal. Short-term sulfate effect experiment further showed that Gibbs free energy of reduction (majority) and abiotic sulfide oxidation (especially between sulfate and selenate) contributed to degradable performance with sulfate. Microbial ecology showed that high percentage of Hydrogenophaga (>= 75%) was one of the contributors for the stable and efficient nitrate degradation. Chemoheterotrophy (ratio>0.3) and dark hydrogen oxidation (ratio>0.3) were the majority of functional profile for biofilm in MBfR, and sulfate led to profiles of sulfate respiration and respiration of sulfur compounds in biofilm. Additionally, no special bacteria for selenate degradation was identified in biofilm microbial ecology, and selenate degradation was relied on Hydrogenophaga (75% of ecology percentage with sulfate addition) and Desulfovibrionaceae (4% of ecology percentage with sulfate addition). But with overloading sulfate, Desulfovibrionaceae was prior to sulfate degradation for energy supply and thus inhibited selenate removal. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：254 / 260

页数：7

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