Study On Eutrophication Control Measures Of Urban Ecological Village Landscape Water

Urban Ecological village landscape water is easy to appear the phenomenon of eutrophication, which causes water black and stinking. Moreover, it conflicts with the concept of construction ecological city. In this paper, three different methods were used to treat the landscape water of the different water quality. Biologic chain control technology can reduce the nitrogen and the phosphorus in the water and prevent the occurrence of eutrophication. Compound technology of flocculant can kill algae timely and quickly. And this method was used to treat eutrophication water that had high aledge content effectively. Landscape water treatment equipment that the process was membrane bioreactor of the combination of biological technology and membrane separation was used to treat the landscape water of the urban ecological village has been eutrophication. The equipment can remove the pollutants quickly and effectively, and recover the landscape fuctions of the water.(1) The Xinhe East Canal was treated by biologic chain control technology which was composed of photosynthetic bacteria and aquatic plants to repair the water. The results showed that the removal rates of chemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus were58%,93%,89%and86%below respectively. And chlorophyll a can drop to3mg/m3below, the removal rate reached more than96%. The water index met the standard of the reuse of urban recycling water-water quality standard for scenic environment use (GB/T18921-2002).(2) The channel water which is around Bihai Environmental Protection Service Center was treated by compound technology of flocculant.Through the test, the optimum dosage of polyaluminium chloride was0.64g/L, and the optimum dosage of polyferric chloride sulfate was0.4g/L. In the best dosing quantity, the water index met the standard of the reuse of urban recycling water-water quality standard for scenic environment use (GB/T18921-2002).(3) The Xinhe East Canal was treated by the landscape water treatment equipment that the process was membrane bioreactor. Through the treatment of the membrane bioreactor, water was transparent and colorless insipidity. Moreover, the sensory character was good. In addition, average water turbidity was0.23NTU. Chemical oxygen demand was30mg/L below, and the removal rate reached about70%. Ammonia nitrogen was mostly2mg/L below, and the removal rate reached more than90%. Total nitrogen was15mg/L below, and the removal rate reached about50%. Total phosphorus was0.5mg/L below, and the removal rate reached50%. The water index met the standard of the reuse of urban recycling water-water quality standard for scenic environment use (GB/T18921-2002).