{"title":"Cadmium removal by constructed wetlands containing different substrates: performance, microorganisms and mechanisms.","authors":"Yuannan Long, Guanlong Yu, Jianwu Wang, Dian Zheng","doi":"10.1016/j.biortech.2024.131561","DOIUrl":null,"url":null,"abstract":"<p><p>This study compared the cadmium (Cd) removal performance of constructed wetlands (CWs), including gravel (G-CW), magnetite (M-CW), coconut shell (C-CW) and biochar (B-CW). C-CW exhibited superior removal efficiencies for Cd compared to other CWs, with efficiencies of 93.18 %.C-CW benefited from the rich organic matter of coconut shells and enhanced DO consumption levels, which facilitated microbial and plant removal of Cd. The total accumulation of Cd in the substrate increased from 9.16 mg/kg to 30.66 mg/kg. Concurrently, the percentage of Cd in the organic matter-bound and residue states increased from 20.52 % to 37.56 %, which effectively reduced the bioavailability of Cd. All CWs can ensure that the plant antioxidant system is not subjected to Cd stress. Saccharimonadales and Micropruina became the dominant genera in all CWs, exhibiting a high tolerance to Cd. This study provides new understanding and theoretical support for selecting substrates to effectively treat heavy metals wastewater with CWs.</p>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":null,"pages":null},"PeriodicalIF":9.7000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bioresource Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.biortech.2024.131561","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
This study compared the cadmium (Cd) removal performance of constructed wetlands (CWs), including gravel (G-CW), magnetite (M-CW), coconut shell (C-CW) and biochar (B-CW). C-CW exhibited superior removal efficiencies for Cd compared to other CWs, with efficiencies of 93.18 %.C-CW benefited from the rich organic matter of coconut shells and enhanced DO consumption levels, which facilitated microbial and plant removal of Cd. The total accumulation of Cd in the substrate increased from 9.16 mg/kg to 30.66 mg/kg. Concurrently, the percentage of Cd in the organic matter-bound and residue states increased from 20.52 % to 37.56 %, which effectively reduced the bioavailability of Cd. All CWs can ensure that the plant antioxidant system is not subjected to Cd stress. Saccharimonadales and Micropruina became the dominant genera in all CWs, exhibiting a high tolerance to Cd. This study provides new understanding and theoretical support for selecting substrates to effectively treat heavy metals wastewater with CWs.
期刊介绍:
Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies.
Topics include:
• Biofuels: liquid and gaseous biofuels production, modeling and economics
• Bioprocesses and bioproducts: biocatalysis and fermentations
• Biomass and feedstocks utilization: bioconversion of agro-industrial residues
• Environmental protection: biological waste treatment
• Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.