An in-situ combined gravel bed sewage treatment facility

Abstract

The invention discloses an in-situ combined gravel bed type device for wastewater treatment. The device is provided with an adjusting pool and a gravel bed, wherein the gravel bed is divided into an anaerobic gravel bed and an aerobic gravel bed which are used for treating the wastewater by steps; in particular, an aerating pipeline directly passes through the gravel in the aerobic gravel bed, andeach gaps attacked through the gravels is used as a single wastewater treatment micro-unit; and meanwhile, the diameter of aerating holes is strictly limited and fits that of a clearance in the gravel bed where the aerating pipe is positioned; the small-diameter aerating holes are capable of obviously treating nitrogen ammonia within the limited clearance range. The device has a good applicationprospect in treatment of water blackening and stink of rivers; the device is generally arranged in the river and close to river bank and is of a shape of a cylinder body with a semicircular cross section, and the radius of the cross section is generally less than one third of the width of the river, so that water in the river can run normally.

Description

technical field [0001] The invention relates to the field of river sewage purification, in particular to an in-situ combined gravel bed sewage treatment facility. Background technique [0002] In recent years, with the development of the economy, the urbanization process has been accelerating, and the urban population has increased rapidly. The backward urban sewage pipe network has caused a large amount of domestic sewage to be directly discharged into urban rivers, resulting in a gradual increase in the concentration of pollutants in the river water, and dissolved oxygen in the water. Constantly falling, black and smelly, seriously affecting the normal physical and mental health of urban residents. It is imminent to remediate the pollution of polluted urban river water bodies. A large number of research and engineering technologies have been applied to river sewage treatment, such as: ecological floating bed, aeration, in-situ dosing of microbial agents, etc. Due to the ...

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Problems solved by technology

Due to the limitation of various reasons, these measures lead to extremely low efficiency of removing pollutants and cannot meet the actual needs.

Moreover, some measures, such as installing a large number of white artificial membrane systems in the river, not only have low purification efficiency, but also seriously damage the landscape function of the river.

[0003] The reason why rivers are black and smelly is that the concentration of ammonia nitrogen in the water is too high. Now the treatment of black and smelly rivers generally mainly removes ammonia nitrogen in the water. Although the method of aeration is beneficial to the removal of ammonia nitrogen, it is only in the river. Into the aeration pipe, the water lacks the carrier for microorganisms to attach, and it is difficult for aerobic microorganisms to carry out the aerobic nitrification reaction of microorganisms together with oxygen, resulting in low removal efficiency of ammonia nitrogen

In addition, although the existing ecological gravel bed technology can effectively remove ammonia nitrogen in the water body and alleviate the black and odor problem, its application requires the excavation of a large area of ​​land, and the available land area of ​​the city is very limited, resulting in the existing ecological gravel bed. Technology is strictly limited in solving the problem of black and smelly rivers in cities

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