Sulfate removal and sulfur transformation in constructed wetlands: The roles of filling material and plant biomass

WATER RESEARCH

卷:102

Article

Chen, Yi^1,2  Wen, Yue¹  Zhou, Qi¹  Huang, Jingang³  Vymazal, Jan²  Kuschk, Peter⁴ 

[1] Tongji Univ, Coll Environm Sci & Engn, Key Lab Yangtze Water Environm, Minist State Educ, Shanghai 200092, Peoples R China

[2] Czech Univ Life Sci, Fac Environm Sci, Dept Appl Ecol, Prague 16521, Czech Republic

[3] Hangzhou Dianzi Univ, Inst Environm Sci & Engn, Hangzhou 310018, Zhejiang, Peoples R China

[4] UFZ Helmholtz Ctr Environm Res, Dept Environm Biotechnol, Permoserstr 15, D-04318 Leipzig, Germany

关键词: Constructed wetlands;    Bacterial sulfate reduction;    Sulfur oxidation;    Denitrification;    Plant litter;   

DOI  :  10.1016/j.watres.2016.07.001

来源: Elsevier

【 摘 要 】

Sulfate in effluent is a challenging issue for wastewater reuse around the world. In this study, sulfur (S) removal and transformation in five batch constructed wetlands (CWs) treating secondary effluent were investigated. The results showed that the presence of the plant cattail (Typha latifolia) had little effect on sulfate removal, while the carbon-rich litter it generated greatly improved sulfate removal, but with limited sulfide accumulation in the pore-water. After sulfate removal, most of the S was deposited with the valence states S (-II) and S (0) on the iron-rich gravel surface, and acid volatile sulfide was the main S sink in the litter-added CWs. High-throughput pyrosequencing revealed that sulfate-reducing bacteria (i.e. Desulfobacter) and sulfide-oxidizing bacteria (i.e. Thiobacillus) were dominant in the litter-added CWs, which led to a sustainable S cycle between sulfate and sulfide. Overall, this study suggests that recycling plant litter and iron-rich filling material in CWs gives an opportunity to utilize the S in the wastewater as both an electron acceptor for sulfate reduction and as an electron donor for nitrate reduction coupled with sulfide oxidation. This leads to the simultaneous removal of sulfate, nitrate, and organics without discharging toxic sulfide into the receiving water body. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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