Eutrophication control using modified local soil/sand induced ecological restoration technology; I, Effect and mechanism on short and long term improvement of water quality

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Authors:Pan Gang; Dai Lichun; Li Liang; Shang Yuanyuan; Li Hong; Bi Lei; He Linchen; Wang Lijing; Wang Dan; Li Qiaoxia; Li Liwen; Gu Xiaozhi; Zhong Jicheng; Yu Yuhe; Yan Qingyun
Author Affiliations:Primary:
Chinese Academy of Sciences, Research Center for Eco-environmental Sciences, Beijing, China
Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, China
Chinese Academy of Sciences, Institute of Hydrobiology, China
Volume Title:Hupo Kexue Journal of Lake Sciences
Source:Hupo Kexue = Journal of Lake Sciences, 24(6), p.801-810. Publisher: Science Press, Beijing, China. ISSN: 1003-5427
Publication Date:2012
Note:In Chinese with English summary. 41 refs.; illus., incl. 1 table
Summary:The authors studied the effect of algal bloom control and water quality improvement using modified local soil/sand induced ecological restoration technology (MLS-IER) in an enclosure in Meiliang Bay of northern Lake Taihu from October 2010 to September 2011. Lab experiments were used to study the mechanism of long-term water quality improvement, including resuspension and internal load control at water-sediment interfaces. The field monitoring results indicated that TN, NO-3-N, NH+4-N, TP, and PO3-4-P were reduced by 66%, 57%, 60%, 93%, 92%, and 98%, respectively, 30min after treatment using MLS. The average concentrations were reduced by 39.83%, 48.53%, 52.30%, 18.75%, and 60.00%, respectively, within the following 11 months compared to the control area. The resuspension experiment showed that the anti-resuspension ability of the modified soil and sand increased by a factor of 3 and 5 compared to unmodified soil. The sediment-water incubation experiment showed that algae flocculation followed by MLS capping remarkably increased the ORP and DO at the sediment-water interface, which reversed the source of the sediment-water flux of TP and TN into a sink and remarkably reduced the flux of PO3-4-P and NH+4-N from sediment to water column. The results suggested that, after the nutrients were quickly removed from the water by flocculating the algal blooms, it is possible to physically reduce the resuspension of the algae flocs and chemically block the release of nutrients from the sediment by MLS capping. Sustainable water quality improvement and reduction of algal bloom recruitment can be achieved when the buried algae banks are decomposed and absorbed when restoring submerged vegetation in shallow waters, which is triggered by MLS-IER technology.
Subjects:Clastic sediments; Controls; Ecology; Environmental effects; Eutrophication; Pollution; Remediation; Sand; Sediments; Soils; Technology; Water pollution; Water quality; Asia; China; Far East; Jiangsu China; Taihu Lake
Coordinates:N305500 N313500 E1203500 E1195500
Record ID:2018063215
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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