科研之友
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摘要
Many urban landscape water bodies have been undergoing accelerated eutrophication due to high anthropogenic pressure and low water environment capacity, especially in developing countries, so it is indispensible to develop and apply an ecologically sustainable approach to restore the unhealthy water bodies. In this study, a demonstration project of ecological restoration for improving and maintaining water quality was conducted in a hypertrophic lake at Kuangou Hostel, Beijing, China, by a combination of hydraulic cycle, reconstruction of lake bed and shoreline and constructed wetland. Two principles of design based on total water volume balance and total phosphorus (TP) balance were innovatively applied to guiding ecological restoration. By constructed wetland, the removal of TP was up to 9.13-13.65 kg/y (year).
Water quality of the lake was improved significantly after ecological restoration. Although concentrations of TP (0.067 +/- 0.008-0.081 +/- 0.012 mg/L) in the lake remained at eutrophic level, chlorophyll-a concentration was effectively controlled below 15 mu g/L, Secchi depth increased from less than 0.45 m to more than 0.88m and algal bloom had never occurred which had been a commonplace before the project. The proposed approach using hydraulic process and artificial ecological measurements such as constructed wetland based on balance of water volume and main pollutant such as phosphorus could be effectively used for restoration and maintenance of urban landscape water bodies.
- 出版日期2012-10
- 单位北京市环境保护科学研究院
