Biochar-amended constructed wetlands for eutrophication control and microcystin (MC-LR) removal

Article

Cheng, R., Hou, S., Wang, J., Zhu, H., Shutes, B. and Yan, B. 2022. Biochar-amended constructed wetlands for eutrophication control and microcystin (MC-LR) removal. Chemosphere. 295, pp. 1-11. https://doi.org/10.1016/j.chemosphere.2022.133830
TypeArticle
TitleBiochar-amended constructed wetlands for eutrophication control and microcystin (MC-LR) removal
AuthorsCheng, R., Hou, S., Wang, J., Zhu, H., Shutes, B. and Yan, B.
Abstract

Microcystins (MCs) pollution caused by eutrophication and climate change has posed a serious threat to ecosystems and human health. Constructed wetlands (CWs) with biochar addition volume ratios of 0% (BC0-CWs), 10% (BC10-CWs), 20% (BC20-CWs) and 50% (BC50-CWs) were set up to evaluate the efficiency of biochar-amended CWs for eutrophication and MCs pollution control. The results illustrated that removal efficiencies of both NH -N and NO -N were enhanced by biochar addition to varying degrees. The average TP and MC-LR removal efficiencies increased with increasing biochar addition ratios, and the average TP and MC-LR removal efficiencies in biochar-amended CWs were significantly (p < 0.05) improved by 5.64-9.58% and 10.74-14.52%, respectively, compared to that of BC0-CWs. Biochar addition changed the microbial community diversity and structure of CWs. The relative abundance of functional microorganisms such as Burkholderiaceae, Nitrospiraceae, Micrococcaceae, Sphingomonadaceae and Xanthomonadaceae was promoted by biochar addition regardless of addition ratios. The higher relative abundance of the above microorganisms in BC20-CWs and BC50-CWs may contribute to their better removal performance compared to other CWs. The concentrations of extracellular polymeric substance (EPS) in biochar-amended CWs were significantly (p < 0.05) lower than that in BC0-CWs, which can reduce the risk of system clogging. This study demonstrated that biochar addition may be a potential intensification strategy for eutrophication and MCs pollution control by CWs. Considering both the removal performance and economic cost, a biochar addition ratio of 20% was recommended as an optimal addition ratio in practical application. [Abstract copyright: Copyright © 2022. Published by Elsevier Ltd.]

KeywordsConstructed wetlands, Eutrophication, Biochar, Microbial community, Microcystin-LR
PublisherElsevier
JournalChemosphere
ISSN0045-6535
Electronic1879-1298
Publication dates
Online08 Feb 2022
Print01 May 2022
Publication process dates
Deposited28 Feb 2022
Accepted30 Jan 2022
Output statusPublished
Digital Object Identifier (DOI)https://doi.org/10.1016/j.chemosphere.2022.133830
LanguageEnglish
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