Sewage treatment method

Abstract

The invention provides a sewage treatment method, comprising the following steps: S1: sewage enters a pretreatment pool, and a grid is arranged in the pretreatment pool, and the sewage flows through the grid to remove some sundries in the sewage; S2: the sewage passes through the pretreatment pool After treatment, it enters the anaerobic hydrolysis tank for treatment; S3: After being treated by the anaerobic hydrolysis tank, the sewage enters the composite biological filter, and flows through the first filter layer of the composite biological filter, the aerobic zone of the second filter layer and the The anoxic zone of the second filter material layer; biofilms are attached to the first filter material layer and the second filter material layer; S4: The sewage is directly discharged or returned to the pretreatment tank after being treated by the composite biological filter Continue processing. The sewage treatment method provided by the invention can adapt to rural sewage treatment and has the characteristics of stable treatment effect and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a sewage treatment method. 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, and because...

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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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