期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 205, 期 -, 页码 201-208出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.09.066
关键词
Multi-zone constructed wetland; Nutrients; Urban runoff; Water quality; Stormwater; Sediments
资金
- European Union from the European Fund of Regional Development based on the Operational Program of the Innovative Economy [POIG.01.01.02-10-106/09]
- EU Project SWITCH (IP 6 PR UE) [GOCE 018530 2006-2011]
The study analyses the efficiency of a Sequentional Sedimentation-Biofiltration System (SSBS) built on the Sokolowka river in Lodz (Poland). It was constructed to purify a small urban river whose hydrological regime is dominated by stormwater and meltwater. The SSBS was constructed on a limited area as multi zone constructed wetlands. The SSBS consists of three zones: sedimentation zone with structures added to improve sedimentation, a geochemical barrier made of limestone deposit and biofiltration zone. The purification processes of total suspended solids (TSS), total phosphorus (TP), total nitrogen (TP) and other nutrients: phosphates (PO43-), ammonium (NH4+) and nitrates (Noy) of the SSBS were analyzed. Chloride (Cl)- reduction was investigated. Monitoring conducted in the first two hydrological years after construction indicated that the SSBS removed 61.4% of TSS, 37.3% of TP, 30.4% of PO34-, 46.1% of TN, 2.8% of NH4+, 44.8% of NO and 64.0% of Cl-. The sedimentation zone played a key role in removing TSS and nutrients. The geochemical barrier and biofiltration zone each significantly improved overall efficiency by 4-10% for TSS, POI-, TN, NOT and Cr. Although the system reduced the concentration of chloride, further studies are needed to determine the circulation of Cl- in constructed wetlands (CWs), and to assess its impact on purification processes. (C) 2017 Elsevier Ltd. All rights reserved.
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