New insights into the effects of support matrix on the removal of organic micro-pollutants and the microbial community in constructed wetlands

Zhang, L., Lyu, T. ORCID: 0000-0001-5162-8103, Ramírez Vargas, C.A., Arias, C.A., Carvalho, P.N. and Brix, H., 2018. New insights into the effects of support matrix on the removal of organic micro-pollutants and the microbial community in constructed wetlands. Environmental Pollution, 240, pp. 699-708. ISSN 0269-7491

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Abstract

Constructed wetlands (CWs) are an eco-friendly and cost-effective technology to remove organic micro-pollutants (OMPs) from wastewater. The support matrix is an important component in CWs as it has a primary role in the growth and development of plants and microbes. However, the roles of the support matrix in CWs in removing OMPs have not been systematically studied. Therefore, in this study, six common materials (sand, zeolite, blast iron slag, petcoke, polonite and crushed autoclaved aerated concrete (CAAC)) as support matrixes were firstly investigated by batch tests to explore their adsorption capacities to selected OMPs (ibuprofen, iohexol, tebuconazole and imazalil). Results showed that the adsorption capacities of the materials were low (at the level of μg/g) compared to well-known sorbents (at the level of mg/g), such as activated carbon and carbon nanotubes. Columns packed with the six materials, respectively, were then built up to study the effects of different materials on microbial community. In the medium-term study (66 days), the removal of four OMPs in all the columns increased by 2–58% from day 25 to day 66, and was mainly attributed to microbial degradation. Furthermore, Community-level physiological profiling (CLPP) analysis indicates that material presence shaped the microbial community metabolic function not only in the interstitial water but also in the biofilm. Overall, all the findings demonstrate that although the adsorption capacities of the common materials are low, they may be a driver to improve the removal of OMPs by altering microbial community function in CWs.

Item Type: Journal article
Publication Title: Environmental Pollution
Creators: Zhang, L., Lyu, T., Ramírez Vargas, C.A., Arias, C.A., Carvalho, P.N. and Brix, H.
Publisher: Pergamon Press
Date: September 2018
Volume: 240
ISSN: 0269-7491
Identifiers:
NumberType
10.1016/j.envpol.2018.05.028DOI
S0269749118307632Publisher Item Identifier
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Jonathan Gallacher
Date Added: 18 May 2018 08:54
Last Modified: 18 May 2018 09:00
URI: http://irep.ntu.ac.uk/id/eprint/33618

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