Ceramsite Facilitated Microbial Degradation of Pollutants in Domestic Wastewater

Although constructed wetlands (CWs) are widely used around the world with various substrates, the mechanisms of how these modified substrates affect wastewater treatment are still unknown. In this study, CW microcosms were established with and without ceramsite as a substrate, and the wastewater tre...

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Bibliographic Details
Published in:International journal of environmental research and public health 2020-07, Vol.17 (13), p.4692
Main Authors: Wan, Qiong, Han, Qingji, Luo, Hailin, He, Tao, Xue, Feng, Ye, Zihuizhong, Chen, Chen, Huang, Shan
Format: Article
Language:English
Subjects:
Artificial wetlands
Biodegradation
Chemical properties
China
Domestic wastewater
Efficiency
Environmental aspects
Environmental degradation
Heavy metals
Microbial degradation
Microcosms
Microorganisms
Nitrates
Nitrification
Nutrient concentrations
Nutrient cycles
Pollutant removal
Pollutants
Principal components analysis
Retention time
rRNA 16S
Sludge
Substrates
Sulfur
Taxonomy
Wastewater pollution
Wastewater treatment
Water pollution
Water treatment
Wetlands
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Summary:Although constructed wetlands (CWs) are widely used around the world with various substrates, the mechanisms of how these modified substrates affect wastewater treatment are still unknown. In this study, CW microcosms were established with and without ceramsite as a substrate, and the wastewater treatment efficiencies were evaluated during 71 days of incubation. Using the 16S rRNA high-through sequencing, the mechanisms of how CW substrate changed the microbial community was quantified. The results showed that compared to soil as substrate, the use of ceramsite as substrate material enhanced the removal of pollutants from CW systems, particularly under a short retention time (1.5-day) condition. There were more beneficial microorganism groups (nitrogen, sulfur, phosphate) in the ceramsite CW system than the non-ceramsite CW system, particularly in the bottom layers. Moreover, the CW with ceramsite substrate had more nitrification function. All of these results suggested that the ceramsite CW system enhanced the removal of pollutants because it increased the concentration of key microbes that are necessarily for nutrient cycles.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph17134692