Integrated device and method for A/O tower biological treatment of organic sewage containing COD and nitrogen

Abstract

The invention provides an integrated device for biological treatment of organic sewage containing COD and nitrogen through an A / O tower. The integrated device comprises a cylinder; a water distribution zone, a filtering zone, a three-phase contact aerobic zone, a nitrification liquid reflux discharge zone and an anoxic zone are sequentially arranged in the cylinder body from top to bottom; the three-phase contact aerobic zone is a normal-pressure high-oxygen biological membrane filler zone in a non-water-accumulation zone; the sewage inlet is formed in the anoxic zone; and a water outlet of the anoxic zone is communicated with a water inlet of the water distribution zone. The device integrates water distribution, filtration, aerobic treatment and anoxic treatment, and the occupied area issaved. The device is high in pollutant removal load per unit volume. The aerobic zone can cooperatively treat odor generated in the anoxic zone; and the removal rate of COD, ammonia nitrogen and totalnitrogen batteries is relatively high.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to an integrated device and method for the biological treatment of organic sewage containing COD and nitrogen by an A / O tower. Background technique [0002] At present, the sewage biological treatment processes and devices widely used at home and abroad all use the cultivation of biological strains in sewage, including anaerobic, anoxic, and aerobic. On the surface of various fillers are contact oxidation, biological turntable method, etc. The above process and devices have their advantages, and are currently widely used in the fields of urban sewage treatment, rural domestic sewage, and industrial organic sewage treatment. However, due to the characteristics of the existing process: (1) Liquid and solid two-phase contact oxygen supply, its capacity is the largest , The aerobic activated sludge or contact oxidation process with the most important fun...

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Problems solved by technology

[0003] However, the existing technology also has the following disadvantages: (1) microorganisms can only absorb dissolved oxygen in sewage, because the solubility of oxygen in water is only 6.84ml / l, it cannot provide the oxygen demand of high-density biological flora, and cannot cultivate high-consumption Oxygen, high activity, and high degradation performance are aerobic biological strains; (2) The walls and bottom of the sewage treatment pool need to withstand high pressure and need to be anti-leakage; the high-pressure fan needs to be installed independently, and the construction cost of the fan room should be high; (3) The high-pressure fan continuously supplies air to the aeration head or aeration pipe combination at the bottom of the sewage tank, and the high-pressure fan, aeration head or aeration pipe combination equipment is expensive; (4) The high-pressure fan has high energy consumption; (5) For optimization The construction cost and gas supply cost of the aerobic biochemical pool, the pool depth is usually controlled at 3-5m, and due to the large operating weight, it can only be arranged independently on the plane, resulting in a large area of ​​the aerobic pool; (6) The anoxic pool produces odor , hydrogen sulfide, and ammonia pollute the environment, and need to be covered to collect and build waste gas treatment facilities, and the noise of high-pressure fans pollutes the environment

[0004] Therefore, the existing technology has the problems of large land occupation, high investment, high energy consumption of fans, high operating costs, severe odor of exhaust gas from anoxic pools, and high noise of high-pressure fans for new sewage treatment plants. Disadvantages such as treatment facilities that cannot meet the standard requirements for discharge water quality, inability to implement on-site upgrading and reconstruction projects, etc.

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