Campus sewage treatment in multilayer horizontal subsurface flow constructed wetlands: nitrogen removal and microbial community distribution

Bai, S., Lyu, T. ORCID: 0000-0001-5162-8103, Ding, Y., Li, Z., Wang, D., You, S. and Xie, Q., 2017. Campus sewage treatment in multilayer horizontal subsurface flow constructed wetlands: nitrogen removal and microbial community distribution. CLEAN - Soil, Air, Water. ISSN 1863-0650

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Abstract

Horizontal subsurface flow constructed wetlands (HSCWs) are widely used for wastewater treatment. The objective of this study was to assess the effects of substrate size selection and layout optimisation on pollutant removal and microbial community distribution responses in HSCWs. Three pilot-scale constructed wetlands (CWs) were established at Guilin University of Technology, China, to treat campus sewage. The three CWs included monolayer (CW1), three-layer (CW2), and six-layer (CW3) substrate structures with the hydraulic conductivity of the substrate increasing from the surface to the bottom in the multilayer CWs. Under an aerial influent loading rate of 0.38 m per day (volumetric loading rate of 0.63 per day), CW3 exhibited the highest removal performance for chemical oxygen demand (COD), NH4+-N, and total nitrogen (TN), with mean values of 81, 81, and 74%, respectively, followed by CW2 (68, 71, and 60%, respectively) and CW1 (56, 46, and 41%, respectively). Nitrification was demonstrated to be the limiting factor of TN removal, and higher TN removal performance in the multilayer CWs was attributed to the higher proportions of nitrifiers, including ammonia-oxidising bacteria (AOB) and nitrite-oxidising bacteria (NOB). Moreover, 454-pyrosequencing showed a significantly different spatial distribution of the N-transforming microbial community in multilayer HSCWs with substrate layout optimisation.

Item Type: Journal article
Publication Title: CLEAN - Soil, Air, Water
Creators: Bai, S., Lyu, T., Ding, Y., Li, Z., Wang, D., You, S. and Xie, Q.
Publisher: Wiley-VCH Verlag GmbH & Co. KGaA
Date: 25 September 2017
ISSN: 1863-0650
Identifiers:
NumberType
10.1002/clen.201700254DOI
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Jonathan Gallacher
Date Added: 03 Oct 2017 09:32
Last Modified: 03 Oct 2017 09:32
URI: http://irep.ntu.ac.uk/id/eprint/31778

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