Composite rural sewage treatment device

Abstract

The invention relates to a sewage treatment device, in particular to a composite rural sewage treatment device for rural domestic sewage. The composite rural sewage treatment device comprises a grid,an oil separation tank, a first-stage constructed wetland and a second-stage constructed wetland, which are communicated in sequence. Large-size floating objects in sewage are removed through the grid, and water treated by the grid enters the oil separation tank to remove most of oil stains in the sewage and then flows into the first-stage constructed wetland and the second-stage constructed wetland. Oil stains possibly existed in rural sewage are basically removed, the problem that the sewage treatment efficiency is low due to grease blockage and other reasons in the later period is effectively solved; and the composite rural sewage treatment device is high in sewage purification efficiency.

Description

technical field [0001] The invention relates to a sewage treatment device, in particular to a composite rural sewage treatment device used for rural domestic sewage. Background technique [0002] Rural domestic sewage mainly includes: toilet sewage, kitchen sewage, domestic washing sewage and other sewage. Generally, rural sewage has the characteristics of uneven water volume and large changes in water volume. With the improvement of rural living standards and the increase in the availability of meat and oil, kitchen sewage has a tendency to become more polluted. In rural sewage discharge, kitchen sewage accounts for one-fifth of the total. Due to the imperfection of the sewage treatment project, most of them use mixed water channels to carry out the scattered discharge of sewage, which causes the surrounding environment to be polluted to varying degrees. The water quality of rural sewage is relatively average, mainly containing COD, N, P, SS and bacteria, and some oil, b...

AI Technical Summary

Problems solved by technology

[0004] In addition, because the artificial wetland is prone to blockage, and it is an open-air sewage treatment facility, the sewage treatment speed is relatively slow. After the wetland is full, it is easy to cause the surface sewage to stink and easily produce mosquitoes because it is too late to process the incoming water.

[0005] The existing technology generally does not include the treatment of kitchen sewage into the scope of rural sewage treatment, because it does not treat oil, it is easy to affect the treatment efficiency of the subsequent treatment process

Rural sewage is prone to produce foul-smelling gas during the treatment process, resulting in poor surrounding environment and affecting the environment of villagers

In addition, most systems tend to ignore problems such as blockage, rainfall, etc., when sewage treatment is completed, and sewage is directly discharged into rivers or nearby ditches without treatment, resulting in problems such as unpleasant gas and poor water quality in constructed wetlands.

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