Integrated biological denitrification sewage treatment device

Abstract

The present invention is an improvement to the biological denitrification (concurrent) oxygen-aerobic water treatment device, which is characterized in that the adjacent partitions forming the internal circulation are set so that the anoxic zone is set on the outer periphery of the aerobic zone, and the upper part of the aerobic zone overflows the periphery There is a gas-liquid separation guide inclined plate above; the water inlet and distribution area is set above the anoxic area, and the water is distributed by the water distribution pipe extending into the anoxic area below the liquid surface. This structure effectively overcomes or reduces the shortcomings of the existing technology of water inflow and backflow to the anoxic zone, which leads to oxygen increase, reduces or limits the oxygen increase in the water inflow to the anoxic zone, and is conducive to controlling the dissolved oxygen in the anoxic zone within a lower required range. It meets the anoxic requirements of denitrifying bacteria, thereby improving the effect of denitrification and denitrification. In addition, it is possible to omit the need to set up another power boosting reflux, and an anoxic zone stirring device, which reduces the operating energy consumption.

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