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Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater

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  • Lixia Jia, Liaocheng University, Northwest Agriculture and Forestry University
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  • Cong Li, Liaocheng University, Shandong Liaohe Environmental Protection Technology Co., Ltd.
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  • Yan Zhang, College of Resources and Environment, Northwest Agriculture and Forestry University
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  • Yingrun Chen, Northwest Agriculture and Forestry University
  • ,
  • Mengqi Li, Northwest Agriculture and Forestry University
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  • Shubiao Wu
  • Haiming Wu, Northwest Agriculture and Forestry University

Using agricultural biomasses as solid carbon substrates in constructed wetlands (CWs) could be an effective way to achieve sustainable nitrogen removal for carbon-limited wastewater treatments. This study investigated the response of bacteria community in CWs to the addition of agricultural biomasses (wheat straw, walnut shell and apricot pit). Results indicated that the addition of different agricultural biomasses had distinct influence on bacterial communities in CWs. Both wheat straw and walnut shell increased the diversity of microbial communities and optimized the structure of microorganisms. The effect of apricot pit on the richness and evenness of microbial communities was not significant, but the composition of microorganisms was significantly affected at the phylum level, especially the relative abundance of phylum Saccharibacteria. Moreover, the addition of agricultural biomasses in CWs acclimatized more functional bacteria including nitrifier and denitrifier, which were proved to be positively correlated with the high-rate denitrification performance. The obtained results would be beneficial to understand the underlying microbial mechanism of nitrogen removal in CWs with agricultural biomass and provide some guidance on the practical application of CWs.

TidsskriftJournal of Environmental Management
StatusUdgivet - sep. 2020

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