DOI: 10.1016/j.watres.2018.10.083
Scopus记录号: 2-s2.0-85055969944
论文题名: Capping with activated carbon reduces nutrient fluxes, denitrification and meiofauna in contaminated sediments
作者: Bonaglia S. ; Rämö R. ; Marzocchi U. ; Le Bouille L. ; Leermakers M. ; Nascimento F.J.A. ; Gunnarsson J.S.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 515
结束页码: 525
语种: 英语
英文关键词: Microbial activity
; Nitrogen
; pH
; Phosphorus
; Restoration
; Sediment remediation
Scopus关键词: Activated carbon
; Aluminum oxide
; Biogeochemistry
; Bituminous coal
; Denitrification
; Ecosystems
; Image reconstruction
; Nitrates
; Nitrification
; Nitrogen
; Organic carbon
; pH
; pH effects
; Phosphorus
; Pollution
; Biogeochemical fluxes
; Biogeochemical process
; Dissimilatory nitrate reduction
; Meiofauna communities
; Microbial activities
; Nitrification activity
; Sediment remediation
; Sedimentary organic matter
; Sediments
; activated carbon
; aluminum oxide
; ammonia
; nitrate
; nitrite
; organic carbon
; oxygen
; phosphate
; silicon dioxide
; abundance
; activated carbon
; benthos
; denitrification
; flux measurement
; meiofauna
; metabolism
; microbial activity
; nitrification
; nitrogen
; organic matter
; pH
; phosphorus
; porewater
; sediment pollution
; Article
; biomass
; coconut
; copepod
; denitrification
; foraminifer
; geochemistry
; meiofauna
; nauplius (larva)
; nematode
; nitrification
; nutrient
; Oligochaeta
; ostracod
; oxygen concentration
; oxygen consumption
; pH
; priority journal
; Rotifera
; sediment
; Turbellaria
; water content
英文摘要: Sediment capping with activated carbon (AC) is an effective technique used in remediation of contaminated sediments, but the ecological effects on benthic microbial activity and meiofauna communities have been largely neglected. This study presents results from a 4-week experiment investigating the influence of two powdered AC materials (bituminous coal-based and coconut shell-derived) and one control material (clay) on biogeochemical processes and meiofauna in contaminated sediments. Capping with AC induced a 62–63% decrease in denitrification and a 66–87% decrease in dissimilatory nitrate reduction to ammonium (DNRA). Sediment porewater pH increased from 7.1 to 9.0 and 9.7 after addition of bituminous AC and biomass-derived AC, respectively. High pH (>8) persisted for at least two weeks in the bituminous AC and for at least 24 days in the coconut based AC, while capping with clay had no effect on pH. We observed a strong impact (nitrate fluxes being halved in presence of AC) on nitrification activity as nitrifiers are sensitive to high pH. This partly explains the significant decrease in nitrate reduction rates since denitrification was almost entirely coupled to nitrification. Total benthic metabolism estimated by sediment oxygen uptake was reduced by 30 and 43% in presence of bituminous coal-based AC and coconut shell-derived AC, respectively. Meiofauna abundances decreased by 60–62% in the AC treatments. Taken together, these observations suggest that AC amendments deplete natural organic carbon, intended as food, to heterotrophic benthic communities. Phosphate efflux was 91% lower in presence of bituminous AC compared to untreated sediment probably due to its content of aluminum (Al) oxides, which have high affinity for phosphate. This study demonstrates that capping with powdered AC produces significant effects on benthic biogeochemical fluxes, microbial processes and meiofauna abundances, which are likely due to an increase in porewater pH and to the sequestration of natural, sedimentary organic matter by AC particles. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122189
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Ecology, Environment and Plant Sciences, Stockholm University, Sweden; Center for Electromicrobiology, Department of Biosciences, Aarhus University, Denmark; Analytical, Environmental and Geo- Chemistry, Vrije Universiteit Brussel, Belgium
Recommended Citation:
Bonaglia S.,Rämö R.,Marzocchi U.,et al. Capping with activated carbon reduces nutrient fluxes, denitrification and meiofauna in contaminated sediments[J]. Water Research,2019-01-01