Combined filter material biological aerated filter system

Abstract

The invention relates to the field of sewage treatment, in particular to a combined filter material biological aerated filter system, which comprises a filter body, an aeration system and a carbon source storage tank, and is characterized in that the filter body internally comprises a non-aeration area and an aeration area, and a retaining wall is arranged between the aeration area and the non-aeration area; a plurality of layers of filter material frames are fixed in the aeration area and the non-aeration area, and filter materials are filled in the filter material frames to form a filler layer; one side, close to the non-aeration area, of the filter tank body is communicated with a water inlet pipe, and one side, close to the aeration area, of the filter tank body is communicated with awater outlet pipe; the aeration system comprises air supply equipment and an aeration pipe arranged in the aeration area, and the air supply equipment is communicated with the aeration pipe through anair guide pipe; and a carbon source storage tank is communicated with the water inlet pipe through a carbon source feeding pipe. The system can improve the water quality treatment efficiency and effect, reduce the operation management difficulty, reduce the operation cost, simplify the structure in the pool and improve the maintenance efficiency, and has lower requirements on water inlet SS.

Description

【Technical field】 [0001] The invention relates to the field of sewage treatment, in particular to a combined filter material aerated biological filter system. 【Background technique】 [0002] Compared with the ordinary activated sludge method, the biological aerated filter has high organic load, small footprint (1 / 3 of the ordinary activated sludge method), less investment (saving about 30%), and no sludge bulking , High oxygen transmission efficiency, good effluent water quality, etc., but it has strict requirements on the SS of the influent (generally SS≤100mg / L, preferably SS≤60mg / L), so pretreatment is required for the influent. It is precisely because of the many advantages of the biological aerated filter that it has been widely used and promoted in the field of sewage treatment, especially the continuous improvement of the current sewage discharge standards, the application of the biological aerated filter in the field of advanced treatment is increasing universal. ...

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Problems solved by technology

[0003] In terms of water flow direction, there are two types of biological aerated filter: upflow type and downflow type. From the form of filter material, it can be divided into light filter material and heavy filter material, and it can be divided into nitrification filter material in terms of function. pool and denitrification filter, and each form of filter has its own advantages and disadvantages, such as the upflow denitrification filter with heavy filter material, the effluent SS effect of this form of filter is better, and the removal efficiency of nitrate nitrogen Generally, the backwashing effect is not ideal and it is easy to block, and the filter material will harden after a long service life; for example, the upflow light filter material nitrification filter has better water quality treatment effect, good backwashing effect, and the filter material is not easy to block , but the water SS is not stable enough, and often exceeds the standard

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