Abstract
Abstract. Lakes play important roles in the economic-social sustainable development. However, due to unreasonable development and urbanization in recent years, lake water pollution and ecological degradation have occurred in China. The improvement of the lake inflow water quality is very important. A filtration system includes Gravel filtering system, Aquatic plant area and Ecological bag area was established. The test river is one of the typical lake inflow river and located in the river network in the Chang Dang lake, China. Water quality, zooplankton and phytoplankton in the inflow river were observed form July to mid-August in order to analyze the general process. The average removal rate of NH3-N (ammonia nitrogen) TN (total nitrogen) and TP (total phosphorus) is 28.33, 25.76 and 24.43 %, respectively. The Pantle-Buck method was used to evaluate the water quality and the B∕T index was used to evaluate the nutrition situation. The B∕T values were reduced by 20 % and the SI pollution index was reduced by 11.8 %. Therefore, a positive effect on the water's ecological restoration was achieved by the filtration system.
Highlights
Lakes play important roles in the nature material circulation and economic-social sustainable development (Jun et al, 2006; Wei et al, 2006; Yang et al, 2008)
A peak was reached on 5 September, and the ecological filtering system was considered to be stable during this period
As viewed from the perspective of the change laws of the ammonia nitrogen between the points after the stability of ecological filtering system was achieved, the changes between Point 1, and Point 2 were found to be larger than the other points. These results indicated that the gravel ecological filtering system had the most obvious incept effect on the ammonia nitrogen in the entire system
Summary
Lakes play important roles in the nature material circulation and economic-social sustainable development (Jun et al, 2006; Wei et al, 2006; Yang et al, 2008). Due to unreasonable development of natural resources and urbanization in recent years, lake water pollution and ecological degradation have occurred (Wei and Chuan, 2003). These factors have even affected the drinking water safety, causing a threat to the sustainable use of lake water resources (Hesheng, 2001; Huixia and Jibo, 2011). Lake eutrophication has become the most serious problem of the water environments in economically developed areas. Effectively governing lake eutrophication has become the focus of the current water environment governance (Cohen et al, 2016; Li et al, 2006; Tian et al, 2006; Wang and Li, 2003)
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