Highly-efficient stable bio-doubling sewage treatment device

Abstract

The invention discloses a highly-efficient stable bio-doubling process sewage treatment device, which is improvement of a bio-doubling process sewage treatment device. The highly-efficient stable bio-doubling process sewage treatment device is characterized in that: an aerobic aeration area is an annular channel, a water propulsion device is arranged in the annular channel, a water-feeding mix reaction area, a water lifting area and a settlement area are internally arranged at the inner side of the annular channel, and the annular channel is respectively communicated with the settlement area and the water-feeding mix reaction area. According to the pool-type structure, the contradiction between low dissolved oxygen amount and high sludge content required by the bio-doubling process is greatly solved, the requirements on a bio-doubling process for low dissolved oxygen amount and high sludge content can be ensured, thus the practical effect and advantage representation of the bio-doubling process are ensured; two or more loops are formed through treatment, thus the involved devices are conveniently overhauled without running stop, and the reflux ratio is adjustable and high; in addition, a controllable gate or valve is additionally arranged between the lifting area and the annular channel, thus practical running adjustability is improved; and after construction or construction finish of the controllable gate or valve, an aeration device is flexibly added, or started / stopped according to water quality, thus the application expandability of the highly-efficient stable bio-doubling process sewage treatment device is good, and adaptability of the highly-efficient stable bio-doubling process sewage treatment device is strong.

Description

technical field [0001] The present invention is an improvement to the biological multiplication process water treatment device, in particular to a highly efficient and stable biological multiplication process sewage treatment device which changes the layout of the treatment pool and can form two or more treatment cycles (a co-built biological multiplication treatment device built in an annular ditch) ). Background technique [0002] The biological doubling process (Bio-dopp) is a novel sewage treatment process invented in Germany, which combines all single processes (biological nitrification, denitrification, phosphorus release, phosphorus absorption, organic matter oxidation, precipitation, etc.) In a rectangular tank with several different treatment units adjacent to each other, low dissolved oxygen (usually 0.3-0.5mg / l) is used to achieve vertical short-range nitrification / denitrification denitrification, and high sludge concentration (usually 5-8g / l) ensures The treatme...

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Problems solved by technology

However, in the actual engineering operation, due to the defects in the layout of the process treatment tank, it is difficult to achieve the required low dissolved oxygen (such as 0.3-0.5mg / l) and high-active sludge (such as 5-8g / l) in actual operation. Ideal state, so the actual project operation is difficult to achieve the design effect, the reason:

[0004] In a single cycle of treatment, the mixing and flow of mud and water mainly depends on the hydrodynamic force generated by the bottom aeration hose and air lift, and the contradiction between low dissolved oxygen aeration and high sludge concentration is difficult to coordinate, such as satisfying low dissolved oxygen and low power generated by aeration , high sludge content is prone to sludge precipitation, which not only reduces the concentration of operating sludge and affects the treatment effect, but also affects the normal operation of the bottom aeration equipment; in order to prevent sludge settlement, increase the amount of aeration, and Because the dissolved oxygen is too large and it is difficult to achieve efficient short-range nitrification / denitrification, the dissolved oxygen in actual projects usually reaches about 2mg / l, resulting in short-range nitrification / denitrification effects that cannot meet the design requirements, resulting in low denitrification efficiency and easy The effluent nitrogen does not meet the standard

Secondly, the power of mud-water mixed circulation mainly depends on the liquid level difference formed by air lift. The relatively low flow rate and the long distance of the treated water circulation flow also limit the increase of sludge concentration, and it is difficult to achieve the high sludge concentration required by biological multiplication.

The reduction of sludge concentration will in turn affect the short-range nitrification / denitrification. At the same time, only relying on the circulation power provided by the liquid level difference generated by the air lift, and the circulating liquid passing through the sedimentation tank, resulting in a small circulation of the mixed liquid, poor adjustability of the reflux ratio, and load resistance. Poor shock and rain exposure shock ability, for example, in the event of abnormal influent water quality or heavy rain, the sludge activity and concentration cannot be maintained stably

Furthermore, the sedimentation zone and the aeration and aerobic zone are arranged side by side, and the sedimentation zone is responsible for the circulation flow, which not only makes it difficult to ensure the static flow required for clarification, which affects the clarification effect, but also tends to cause sludge sedimentation in the flowing mud water due to dead ends in the circulation. It causes the concentration of sludge in the circulating sewage to decrease; when the inflow of heavy rain suddenly increases, it is easy to cause a large flow of water to cause sludge loss, which also causes the concentration of circulating sludge to decrease after the rain. If the air lift is turned off, although the sludge can be reduced However, due to the lack of sludge renewal cycle, the nutrients required to maintain microbial metabolism are not enough, resulting in insufficient nutrients for microbial metabolism and "starvation death" without nutrient sources for microorganisms, resulting in a long recovery time for the system after rain, affecting normal water discharge , so the ability to resist the impact of heavy rain is poor

In addition, due to the layout of the pool-type treatment unit, there is only one cycle of mud-water mixture in the treatment process, and the pools are operated in series to form a closed single cycle. In this way, the maintenance of any pool will affect the operation of other pools

The above-mentioned defects caused by the structure of the treatment pool seriously affect the advantages and treatment effects of the biological multiplication process, which makes it difficult to achieve the design effect in actual engineering operation and limits the advantages of the biological multiplication process.

[0005] Furthermore, the low dissolved oxygen in the biological doubling process can treat waste water with low ammonia nitrogen content up to the standard and save energy consumption, but when treating sewage ammonia nitrogen (NH 3 -N) has a high concentration, such as tannery wastewater, alcohol wastewater, etc. (NH 3 -N≥100mg / l), low dissolved oxygen will lead to insufficient oxygen supply in the aerobic zone, it is difficult to achieve complete oxidation of nitrogen and nitrogen, and affect the removal effect of ammonia nitrogen, thus limiting its application in high ammonia nitrogen wastewater, resulting in process limitations sex

[0006] Chinese patent CN101602541 biological sewage treatment process and device, its treatment pool type is still the same as the typical biological multiplier, and its above-mentioned shortcomings brought by the pool type structure have not been overcome

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