| Landscape water account for a growing proportion of the people living and working, eutrophication problem of landscape water has been the focus gradually. However, due to the special nature of landscape water, causing it difficult to maintain a stable and good water quality.In this study, starting from the periphery of the campus, based on rivers and lakes are two types of water features in the landscape, we proposed the subregional restoration measures of the landscape water.And because of the landscape water pollution, it is in a high state of eutrophication all year round, and the current restoration measures are inefficient in the cold winter months. Therefore, in addition to subregional restoration measures, the study also proposed by points of the season to repair landscape water countermeasures. On the basis, the article focuses on the repair for the winter, aims to propose more effective winter landscape water rehabilitation program.Sampling was between November 2014 to January 2015, to analyze the quality conditions of landscape water in the winter. The results showed that the landscape water temperature was between 13.5-20.4 ℃, TN concentration was 2-13.56 mg/L, TP concentration was 0.11-0.56 mg/L and the ratio of nitrogen and phosphorus in water bodies was 8-81. Landscape water quality was Grade V poor, nutrient limitation type of water bodies was phosphorus-limited. According to the results of score, overall state index and algae pollution index, showed that in winter the landscape water eutrophication reached, water was severely polluted. In addition, correlation analysis and canonical correspondence analysis obtained that it is not significant (p> 0.05) between algae population structure and the number of each section of the algal population and environmental factors.In laboratory, we simulated the purification process of algae turf scrubber (ATS) on the winter landscape water, to analyze removal efficiency of different materials, operating parameters and algae of group structure on landscape water bodies. It was found that N and P removal efficiency of algae bamboo floor unit was running up to 70% during 45 days, while the N and P removal rate of plastic material algae floor unit reached 70-80% at the same time, compared to bamboo, plastic material removal device was slightly higher. By changing the operating parameters, removal rate of N and P of the device increased to 50-60% within 30 days. Based on these, by adding Melosira, and optimizing algae group structure of ATS, it was found that removal device of N and P could be increased to over 70% within 30 days. It proved that the optimization of ATS can improve its operating efficiency in the winter.According to the monitoring results, TN load in the winter landscape water river reached 413.21 kg, TP reached 11.72 kg, TN load of the winter lake reached 366.47 kg, TP load was 9.38 kg. Assuming set a wild ATS with 160 m length, width of 1.5 m, flow of 8.4 m3/h, according to the results of small scale experiments, we can estimate the device can be removed N 1.6 g/m2 and P 0.31 g/m2 every day, then it can be removed the nitrogen is 384 g, phosphorus is 74.4 g by ATS in the winter, and it will greatly reduce landscape water load of nitrogen and phosphorus nutrients in winter.The study providing a scientific reference for exploration of enhancing the winter landscape water restoration efficiency. |
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