Control Strategies In Ningbo City Of River Water Pollution

Ningbo, the City which is the harbor through the world,, has an innate affinity of water. These Waters including two lakes, three rivers and six brooks have already deeply combined with the development of the whole city since the founding of Ningbo. There are 164 river courses in the main city at presents, and the total length of these watercourses is 196,134 meters. The total area of the water is 3.65 million square meters. In this paper, we studied the ecological management techniques of river courses from domestic to foreign in these thesis, to understand the ecology technology of urban river courses water treatment and its application instances. By learning all kinds of domestic and foreign advanced experience of the water environment governance, we selected governance methods for the geographical features of Ningbo city.The main contents and achieved results are as follows:1. in the case of Di Yang Cao river course integrated ecological management,as an example, we studied the feasibility of ecological restoration techniques which is combined with beneficial bacteria and aquatic plants biological purification in the urban semi-enclosed river basin. Through this method, the water quality main index CODMn of the Di Yang Cao fell from 8.28 to 5.27; PH value decreased from 7.47 to 7.44; total phosphorus decreased from 1.26 to 0.28; ammonia decreased from 4.27 to 0.93, water quality has been greatly improved.2. in the case of Cai Jia He river courese self-purification ecological restoration technology, as an example, we study the urban river basin area in antifouling curtain, blocking fish electric gate, lock phosphorus compounds, submerged plant breeding and cuttings and other technology which to improve river water quality, effectively reduce water eutrophication degree, restore the river self-purification ecosystem, improve river "metabolism" and vitality.