Denitrification deep bed filter with water-gas combined back flushing function

Abstract

The invention discloses a denitrification deep bed filter with a water-gas combined backwashing function, the denitrification deep bed filter comprises a tank body, a water washing assembly, a gas washing assembly, a carbon source filling assembly and a control box, a water distribution weir plate, a quartz packing layer and a filter brick layer are s arranged in the tank body from top to bottom,the water washing assembly comprises a water washing pump, a water distribution main pipe and a water washing branch pipe, the water washing pump is connected with the water distribution main pipe, the water washing branch pipe is connected with the water distribution main pipe, the gas washing assembly comprises a roots blower, a gas distribution main pipe, a gas distribution branch pipe and an adjusting sleeve, the roots blower is connected with the gas distribution main pipe, the gas distribution branch pipe is connected with the gas distribution main pipe, the adjusting sleeve is movably arranged outside the gas distribution branch pipe in a sleeved mode, the carbon source filling assembly comprises a carbon source storage tank and a carbon source filling pipe, the carbon source filling pipe is used for being connected with the tank body and the carbon source storage tank, and the control box is respectively connected with the water washing pump and the roots blower; the structureis simple, the design is reasonable, and the filter tank can be subjected to water-gas combined backwashing, so that the filter material is prevented from being blocked, and the denitrification deep bed filter is suitable for large-scale popularization.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a denitrification deep bed filter with water-gas linkage backwashing function. Background technique [0002] With the rapid development of the economy, the continuous leakage of nitrogen and organic matter has caused the water bodies of lakes and reservoirs to deteriorate day by day, and the problem of eutrophication of water bodies is quite prominent. More and more attention has been paid to the control of nitrogen pollution, and it has become an important task of water pollution control at present and in the future. Phosphorus and nitrogen removal and advanced treatment of suspended solids are the main body of upgrading and upgrading of all sewage treatment plants. Since the phosphorus removal process mainly uses chemical In addition, civilian detergents use phosphorus-free formulations, and low phosphorus discharge in sewage is relatively easy to achieve and relativel...

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Problems solved by technology

[0003] However, during the operation of the traditional denitrification biological filter, microorganisms will grow between the fillers, which will cause the filter resistance of the filler layer to increase, the water flow rate to decrease, and even the filter layer to be completely blocked and the water to flow out. In order to solve this problem, usually Arrange gas distribution pipes or water washing pipes at the bottom of the filter, use the scouring effect of gas or water to drive the packing movement, wash down the excess microbial film in the packing layer, and restore the flux of the filter material layer. However, due to the denitrification biological filter. Water enters the bottom, and the chemical oxygen demand added from the outside is also added at the bottom, which makes the bottom of the filter rich in nutrients, and the growth of microorganisms is much lower than that in the middle and upper parts. When backwashing, airflow or water flow should be used to flush the microorganisms from the bottom to the bottom. On the other hand, backwashing with air flow or water flow alone will affect the survival and reproduction of denitrifying organisms and cause Loss of filter material

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