Buried sewage ecological treatment system

Abstract

The invention belongs to the technical field of sewage treatment of environmental engineering, and particularly relates to a device for sewage treatment. The technical scheme of the invention is as follows: a buried sewage ecological treatment system is characterized by comprising a relatively closed box body which is internally provided with a water distributing device, a macroporous high-permeability filter material layer, a denitrification anaerobic layer, a percolation layer, a drainage device and a water receiving gravel layer, wherein the macroporous high-permeability filter material layer, the denitrification anaerobic layer, the percolation layer and the water receiving gravel layer are sequentially paved in the box body from top to bottom. An air inlet is formed in a position corresponding to the macroporous high-permeability filter material layer of the box body located at the gap or on the box body. A sprinkler head of the water distributing device is arranged above the macroporous high-permeability filter material layer, and a water conveyer pipe of the drainage pipe is arranged below the percolation layer. By adopting the technical scheme, the invention provides a power-free novel buried sewage ecological treatment system which is efficiently rich in oxygen and realizes full and direct contact of sewage and air.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, in particular to a device for sewage treatment. technical background [0002] With the rapid development of my country's economy, the situation of water pollution is becoming more and more serious, especially in areas such as the Huaihe River Basin, the Yangtze River Basin, Taihu Lake, Chaohu Lake and other areas where water eutrophication caused by water pollution occurs from time to time. "863 plans have invested a lot of money to develop non-point source pollution prevention and control technologies suitable for my country's national conditions. On the other hand, since my country's overall development level is still at a relatively low level, in cities, the infrastructure costs and operating costs of sewage plants are often a major problem restricting sewage treatment. In rural areas that account for the vast majority of my country's population, sewage Basica...

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Problems solved by technology

[0005] Rapid infiltration process, slow infiltration process, artificial wetland and other treatment technologies require a large area of ​​treatment site, which consumes valuable land resources; and the treatment site cannot be restored to its original appearance at the same time; it is easy to generate odor and breed mosquitoes to pollute the surrounding environment; Moreover, the process is greatly affected by the climate, and the treatment performance often drops greatly in winter; at the same time, these three processes have problems such as insufficient reoxygenation and insufficient carbon source during denitrification.

[0006] The shortcomings of the underground infiltration process currently used in China are: with the operation of the treatment system, the system is prone to clogging, and the oxygen supply of the soil infiltration layer is insufficient, resulting in a reduction in the activity of aerobic microorganisms that remove organic matter and nitrifying bacteria that perform nitrification reactions. , the nitrification rate is very low, NH 4 + -N to NO 3 － - The conversion rate of N decreases, and the ammonia nitrogen in the process effluent often does not meet the standard

Moreover, the Nimi-type underground infiltration process that is widely used at present is equipped with an anaerobic tank under the water distribution point of the system for the purpose of preventing clogging and improving the anaerobic degree, which intercepts most of the organic matter. This process characteristic makes system even with good reoxygenation, NH 4 + -N is converting to NO 3 － After -N, due to the interception of organic matter mainly SS and the separation of sewage, the NO in sewage 3 － -N often lacks carbon source during denitrification, which leads to low denitrification efficiency. Therefore, how to improve reoxygenation and increase carbon source in the denitrification process for Nimi-type underground infiltration systems has attracted people's attention.

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