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The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects
Jing, Lian Dong1,2; Wu, Chen Xi1; Liu, Jian Tong1; Wang, Hua Guang1,2; Ao, Hong Yi1; Liu, JT (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.
2013-03-01
Source PublicationECOLOGICAL ENGINEERING
ISSN0925-8574
Volume52Pages:167-174
AbstractSediment dredging is a controversial technology for eutrophication control. It is necessary to understand its environmental effectiveness and mechanisms. In this study, sediments from un-dredged (UDR), fresh-dredged (FOR) and post-dredged (PDR, 3 years later) regions of Dongqian Lake were collected to compose sediment-water microcosms for evaluating the effects of dredging on nitrogen cycling. From 0 to 19 days, ammonia in the overlying Water greatly increased in UDR (603.1%) and FOR (269.3%), but slightly in PDR (88.7%). The increase of ammonia concentration in water was negatively correlated with DO which was higher in two dredged groups than that in un-dredged groups. These results suggest that dredging could lead to ammonia release to water column in a short term, while ammonia release risk is low few years after dredging. In addition to high DO content, high Eh values, low pH and sediment porosity in two dredged groups may weaken the attenuation of nitrate. TN contents in both sediment and overlying water indicate that nitrogen lost in un-dredged group while had no significantly change in two dredged groups, indicating the ability of nitrogen removal in dredged groups was weakened. Our study suggests that dredging may have potentials to weaken nitrate and/or nitrogen removal from lake systems over years. For this, we should pay more attention on dredging area in dredging projects. Moreover, dredging is better to be conducted in low temperature seasons after blocking external nutrient loadings. (C) 2013 Elsevier B.V. All rights reserved.; Sediment dredging is a controversial technology for eutrophication control. It is necessary to understand its environmental effectiveness and mechanisms. In this study, sediments from un-dredged (UDR), fresh-dredged (FOR) and post-dredged (PDR, 3 years later) regions of Dongqian Lake were collected to compose sediment-water microcosms for evaluating the effects of dredging on nitrogen cycling. From 0 to 19 days, ammonia in the overlying Water greatly increased in UDR (603.1%) and FOR (269.3%), but slightly in PDR (88.7%). The increase of ammonia concentration in water was negatively correlated with DO which was higher in two dredged groups than that in un-dredged groups. These results suggest that dredging could lead to ammonia release to water column in a short term, while ammonia release risk is low few years after dredging. In addition to high DO content, high Eh values, low pH and sediment porosity in two dredged groups may weaken the attenuation of nitrate. TN contents in both sediment and overlying water indicate that nitrogen lost in un-dredged group while had no significantly change in two dredged groups, indicating the ability of nitrogen removal in dredged groups was weakened. Our study suggests that dredging may have potentials to weaken nitrate and/or nitrogen removal from lake systems over years. For this, we should pay more attention on dredging area in dredging projects. Moreover, dredging is better to be conducted in low temperature seasons after blocking external nutrient loadings. (C) 2013 Elsevier B.V. All rights reserved.
SubtypeArticle
KeywordSediment Dredging Nitrogen Balance Dredging Projects Environmental Effectiveness
Department[Jing, Lian Dong ; Wu, Chen Xi ; Liu, Jian Tong ; Wang, Hua Guang ; Ao, Hong Yi] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China ; [Jing, Lian Dong ; Wang, Hua Guang] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
DOI10.1016/j.ecoleng.2012.12.109
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Technology
Funding OrganizationState Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007]
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Engineering
WOS SubjectEcology ; Engineering, Environmental ; Environmental Sciences
WOS IDWOS:000316827200021
WOS KeywordCOMMUNITY STRUCTURE ; NITRATE REMOVAL ; LAKE ; PHOSPHORUS ; DENITRIFICATION ; PHYTOPLANKTON ; EUTROPHICATION ; RELEASE ; SHALLOW ; QUALITY
Funding OrganizationState Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] ; State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007]
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/19328
Collection水环境工程研究中心_期刊论文
Corresponding AuthorLiu, JT (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.
Affiliation1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Jing, Lian Dong,Wu, Chen Xi,Liu, Jian Tong,et al. The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects[J]. ECOLOGICAL ENGINEERING,2013,52:167-174.
APA Jing, Lian Dong,Wu, Chen Xi,Liu, Jian Tong,Wang, Hua Guang,Ao, Hong Yi,&Liu, JT .(2013).The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects.ECOLOGICAL ENGINEERING,52,167-174.
MLA Jing, Lian Dong,et al."The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects".ECOLOGICAL ENGINEERING 52(2013):167-174.
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