A/O-embedded nitrobacteria carrier combined-application biological treatment system

Abstract

The invention discloses an A / O-embedded nitrobacteria carrier combined-application biological treatment system including an anoxic tank and an aerobic tank; water passing holes are respectively formed at positions between the anoxic tank and the aerobic tank and close to two sides of tank bodies, and each water passing hole is provided with a water inlet gate; two sides of the tank body of the aerobic tank are each provided with a water outlet channel, and a water outlet blocking net and a water outlet gate are arranged at the front of each water outlet channel; the aerobic tank is internally provided with a liquid level meter and an aeration device. The two water inlet gates and the two water outlet gates are opened and closed in turn; when the water inlet gate at one side is opened, the water outlet gate at the same side is closed and the water outlet gate at the opposite side is opened; when the water inlet gate at one side is closed, the water outlet gate at the same side is opened and the water outlet gate at the opposite side is closed. With periodic switching of water inlet and outlet positions, various problems, such as the problems that a medium is unevenly distributed in the tank body, congestion easily happens at the water outlet end and the water outlet blocking nets are easy to plug, generated in the technology in engineering application can be solved. The system is simple to apply, prone to automation control and stable in operation.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to an A / O-embedded nitrifying bacteria carrier combined application biological treatment system. Background technique [0002] In recent years, with the intensification of environmental pollution in our country and the country's continuous emphasis on environmental protection, the discharge standards of urban sewage treatment plants have become more and more stringent. Most sewage plants must implement the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918 -2002) level A standard, some areas even require to meet the fourth type of water discharge standard. [0003] Judging from the treatment processes commonly used in existing sewage treatment plants, COD, BOD 5 , pH, SS and other indicators are not difficult to reach the first-level A standard, which can be achieved by optimizing and adjusting process parameters. TP can basically reach the standard through b...

AI Technical Summary

Problems solved by technology

For the first type of spherical filler, due to its large volume, in order to prevent it from being lost with the effluent, it is common practice to add front, rear and top barriers to a certain section of the biochemical tank along the length of the tank. The pores of the barriers should be smaller than the diameter of the filler. Fix all the fillers in the block, and when the water flows through, rely on the combined action of the activated sludge in the pool and the biofilm attached to the surface and inside of the filler to remove the pollutants in the sewage; for the second type of cylindrical filler, its characteristics Because the density is close to that of water, it is completely mixed with the sewage in the biochemical tank, and it is completely fluidized with the water flow and aeration. To prevent the loss of filler, a self-cleaning system should be installed at the water outlet block to prevent the block from being blocked by filler or other impurities. At the same time, it is necessary to optimize the structure of the tank body or the aeration method and intensity to ensure that the distribution of the filler in the entire tank is relatively uniform; and Compared with the relatively mature application technologies of the first two types of fillers, embedding carriers are quite different in terms of material, production process, appearance, size, etc. Lag, most of them still use the application method of filler, and only set a block at the water outlet to prevent the loss of the carrier, but because the volume of the carrier is very small, the hole diameter of the block is generally less than 2mm, resulting in frequent blockage of the block, making it difficult to operate normally and stably

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