Integrated biological denitrification sewage treatment device

Abstract

The invention relates to improvement on a biological denitrification anoxic (facultative)-aerobic water treatment device. The improvement of the biological denitrification anoxic (facultative)-aerobic water treatment device is characterized in that anoxic and aerobic reaction zones which form internal circulation are adjacently and separately arranged in a way that an anoxic zone is arranged at the periphery of an aerobic zone, and gas-liquid separation flow diversion sloping plate is arranged above the overflow periphery of the upper part of the aerobic zone; a water inlet water distribution zone is arranged above the anoxic zone, and water distribution is carried out by a water distribution pipe stretching into the liquid level of the anoxic zone. Through the structure, the disadvantage of oxygenation caused by feeding water in the anoxic zone and reflux in the prior art can be effectively overcome or reduced, water feeding oxygenation to the anoxic zone can be reduced or limited, dissolved oxygen in the anoxic zone is favorably controlled within a lower requirement range, the anoxia requirements of denitrifying bacteria can be met, and the denitrificaiton effect is further increased; additionally-set power for lifting reflux and a stirring device in the anoxic zone can be omitted, so that the running consumption is reduced.

Description

technical field [0001] The present invention is an improvement to the anaerobic (concurrently) oxygen-aerobic water treatment device mainly used for biological denitrification, especially relates to an internal circulation type, which does not need to increase the power additionally, and the power consumption is small. The anoxic pool has less oxygen increase, which is beneficial to maintain the low DO in the anoxic pool and the integrated biological denitrification sewage treatment device. Background technique [0002] The eutrophication of water body has attracted more and more people's attention, and the sewage treatment standard has also been improved. The purpose of sewage treatment is no longer just to remove BOD and SS. The removal of nutrients such as nitrogen and phosphorus has become an important control target of sewage treatment. The anoxic-aerobic (A / O) biological denitrification technology developed based on traditional nitrification-denitrification has been ap...

AI Technical Summary

Problems solved by technology

This structure is anoxic / aerobic biological denitrification, and the actual denitrification effect is not very high, so that the superiority of anoxic / aerobic biological denitrification cannot be fully exerted. The main disadvantages are: the construction of a sub-pool, which occupies a large area , the investment cost is high; the backflow of the second aerobic pool to the anoxic pool needs to increase the backflow boost power, and the return flow of the backflow liquid is usually large, for example, the backflow ratio is up to about 200%, and in order to make the backflow liquid and the influent water and anoxic The sewage in the pool is fully mixed, and it is necessary to add a stirring device in the anoxic pool, so the auxiliary power consumption is relatively large; the three-anoxic denitrification effect must be carried out at a low dissolved oxygen (DO) such as DO ≤ 0.5mg / l, and the objective For aerobic nitrification, higher DO (2.0-4.0 mg / l) is required, and a large amount of reflux liquid from the aerobic tank directly enters the anoxic tank, and the anoxic tank is stirred and mixed, and the water in the anoxic tank adopts a drop type , the three factors will lead to an increase in DO in the anoxic tank (the last two are air), so it is difficult to maintain the low DO required in the anoxic tank, thereby reducing the denitrification and denitrification capacity, which is the cause of denitrification The main reason for the unsatisfactory effect; four nitrification-denitrification mainly adopts the sludge method of activated sludge, which produces a large amount of excess sludge, and sludge treatment is required, which increases the operating cost

Although the Chinese patent CN201313854 uses the water inlet to be set at the bottom of the aerobic zone to reduce the aeration caused by the influent, it cannot allow the denitrifying bacteria in the anoxic zone to preferentially obtain high carbon sources in the influent, which also affects the performance of biological denitrification; The water flows directly to the aerobic zone, which will easily cause the treated sewage to directly enter the sedimentation tank short-circuit flow during the air lifting process; at the same time, the sedimentation tank is set above the aerobic zone, which complicates the overall structure of the equipment and is not conducive to management and maintenance