Microbial community responses to agricultural biomass addition in aerated constructed wetlands treating low carbon wastewater. (15th September 2020)

• Record Type: Journal Article
• Authors: Jia, Lixia; Li, Cong; Zhang, Yan; Chen, Yingrun; Li, Mengqi; Wu, Shubiao; Wu, Haiming
• Is Part Of: Journal of environmental management. Volume 270(2020)
• Publication Date: 2020-09-15
• Subjects: Constructed wetlands -- Agricultural biomass -- Microbial community -- Nitrogen removal -- Low carbon wastewater; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2020.110912
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: 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. Graphical abstract: Image 1 Highlights: Agricultural biomass promoted the diversity of the microbial community in CWs. The structure of bacteria in CWs with apricot pit differed from other biomass. Specific bacteria acclimated in CWs was positively correlated to nitrogen removal.