Sewage treatment system

Abstract

The invention provides a sewage treatment system. The system comprises a pretreatment pond, an anaerobic hydrolysis pond and a compound biological filter pond. The pretreatment pond is provided with a sewage inlet and internally provided with a grid. The anaerobic hydrolysis pond is used for treating sewage treated by the pretreatment pond and is communicated with the compound biological filter pond through a water outlet pipe. The compound biological filter pond comprises a filter pond body, and an aeration machine and an aeration pipe. The filter pond body is filled with a first filter material layer and a second filter material layer from top to bottom, a drainage chamber is arranged between the second filter material layer and the bottom of the filter pond, and biological membranes are fixedly arranged on the first filter material layer and the second filter material layer respectively. The filter pond body is provided with a drainage port corresponding to the drainage chamber in position. The aeration pipe is connected with the aeration machine. Part of pipe section of the aeration pipe extends into the middle of the second filter material layer. Part of pipe section of the water outlet pipe extends into the first filter material layer. The sewage treatment system can adapt to rural sewage treatment and has the advantages of being stable in treatment effect, small in occupied area and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment equipment, in particular to a sewage treatment system. Background technique [0002] my country has always attached great importance to the prevention and control of water pollution. In recent years, great achievements have been made. The quality of the water environment has improved, but the existing problems are still serious. The main manifestations are that the centralized pollution sources in cities have been paid attention to and treated, and the water environment in the concentrated urban built-up areas has been improved to a certain extent. At present, the main pollution of water bodies has changed from point source pollution to initial rainwater pollution, agricultural non-point source pollution and rural scattered pollution of domestic sewage. [0003] The discharge of rural water pollutants remains high, accounting for more than 50% of the national water pollutant discharge, a...

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Problems solved by technology

[0003] The discharge of rural water pollutants remains high, accounting for more than 50% of the national water pollutant discharge, and because rural domestic sewage is far away from the urban pipe network, the cost performance of collecting sewage pipes is low, and the treatment rate is low due to the impact of funds. Decentralized sewage treatment plant treatment

[0004] At present, most of the distributed domestic sewage treatment devices use activated sludge treatment devices, and some biofilm treatment devices are also used. Generally speaking, the operation effect is not good

In addition to inadequate management and other reasons, there are also problems in technology selection

[0005] The biggest difficulty in sewage treatment in some rural areas is that the amount of sewage is unstable. On the one hand, the reason is that due to factors such as scattered rural residences and undulating terrain, the cost-effectiveness of sewage collection system construction is low, and it is difficult to collect all the sewage; Influenced by the rural population going out to work, etc., the population fluctuates greatly, the population is large during holidays, and the resident population is small at ordinary times. The treatment device must adapt to different water volume requirements, and its anti-fluctuation requirements are high.

[0006] If the activated sludge treatment process (such as A / O method, A / A / O method, biological contact oxidation method, MBR method, etc.) is adopted, due to the unstable amount of sewage, the design load is usually low, and it is difficult to form a sufficient concentration of biological Sludge, the treatment effect cannot be guaranteed, and some devices are idle after being put into use

[0007] Although the biofilm treatment process (biological filter, land infiltration, etc.) has improved the adaptability to the amount of sewage, it usually occupies a large area, and there are problems such as easy blockage of the system, which affects the application

[0008] Constructed wetlands, oxidation ponds and other technologies are used, and the impact load resistance is poor. The treatment effect is affected by factors such as temperature and rainfall, and the effect is unstable. It occupies a large area and is poor in implementability.

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