Experimental Study On Technology In Anhui TypicaL RuraL Sewage Treatment

Rural sewage effluent including Manure, Laundry waste water, bathing water and kitchen waste, containing a variety of organic contaminants, synthetic detergents, grease, suspended solids and bacteria and so on. With the constant improvement of urban sewage facilities, direct discharge of sewage in rural areas, although a small amount every emissions, but the total emissions from large rural areas, is one of the main causes of water pollution and eutrophication. To make the water pollution situation in Anhui fundamentally improve, strengthen rural sewage treatment increasingly important.Currently sewage treatment in rural Anhui province, there are certain problems in both cost and environmental, policy, management, etc., but it is due to problems in the final analysis, the choice of improper treatment process produces. This paper summarizes the main mode of domestic and rural sewage treatment, combined with local conditions in Anhui, Anhui Province raised the difficulties rural sewage treatment, sewage treatment and recommend suitable combination of two processes in most areas of Anhui Province. At the same time through a combination of relevant experimental study major pilot project (1) is suitable for most areas of Anhui two rural sewage treatment process for the objectives to be achieved, "urban sewage treatment plant emission standards" (GB18918-2002), an A standard analysis of solar micro power A2O+constructed wetland combined process, high load percolation field+ denitrification tank combined process of processing parameters; (2) for solar micro power A2O+subsurface flow constructed wetland sewage treatment process, were tested in the sunny, cloudy relationship with the production capacity, aeration, aerobic wastewater treatment pond DO concentration and effect under rainy conditions. (3) For high load percolation field+denitrification tank combined process, without changing the structure, without increasing investment conditions, adjusting the mix of raw water tank to the denitrification tank test results and determine the optimum mixing ratio of the raw water.The results showed that (1) solar micro power A2O+constructed wetland sewage, high load percolation field+denitrification tank effluent combined process can achieve "urban sewage treatment plant emission standards" (GB18918-2002) A standard one (2) trial found that solar aerators, sunny with cloudy weather conditions, adequate aeration; under rainy weather conditions, the aeration does not meet the conditions required for stable operation of the system, increase the rectification conventional power conversion system interfaces (mains and solar controller), the aeration meet the requirements. (3) The test data can not analyze the reasons TN compliance after sewage infiltration fields, C/N decreased denitrification tank can not give adequate C source. For denitrification tank influent Low C/N, the water quality characteristics of Low B/N, in which no additional carbon and alkalinity conditions, select Add to adjust the raw water tank to the denitrification tank approach. Without prejudice to other water indicators premise optimum mixing ratio of the raw water, for in this case is 10%, TN enhance the overall removalefficiency of about 10%, reaching 77.5%.