Improved intensive aeration and venous biofilter

Abstract

The invention discloses a modified intensive aeration and vein type biofilter. The modified intensive aeration and vein type biofilter comprises a biofilter body (1). A water distribution region (6), a supporting layer (5), a biological filler region (3) and a coping water layer region (4) are arranged in the biofilter body. An intensive aeration and cyclic guiding device (2) is arranged in the biofilter body. The intensive aeration and cyclic guiding device comprises an inner guiding barrel (2-1), an outer guiding barrel (2-3) is arranged outside the inner guiding barrel, a breather pipe (13) is arranged at the upper end of the outer guiding barrel, and a water suction guide pipe (2-2) is arranged between the outer guiding barrel and the inner guiding barrel. The problems caused by the fact that the sewage flowing direction and the gravity direction of a traditional biofilter are the same are solved; low-concentration sewage cyclically treated once or more times can be fully mixed with original sewage, then the mixture is subjected to biological oxidation, the treatment effect is improved, and the biolfilter body has high adaptability to sewage with higher concentration and toxicity.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to an improved intensive aeration and venous biofilter technology capable of simultaneously realizing high-efficiency biological decarburization and denitrification and excellent filtering effect. Background technique [0002] Biological aerated filter (BAF for short) is an aerobic wastewater treatment process based on the biological contact oxidation process by introducing the idea of ​​filtration in drinking water treatment. It appeared in the late 1970s and early 1980s. In Europe, its outstanding feature is the combination of biological oxidation and filtration based on the first-level intensive treatment. There is no sedimentation tank at the rear of the filter, and the periodic operation of the filter is realized by backwashing to remove the intercepted matter and excess biomass. . This process not only has good performance in removing SS, COD, BOD, nitrification, phosphorus re...

AI Technical Summary

Problems solved by technology

[0006] ①The traditional biological aerated filter is aerated and oxygenated directly from the bottom of the tank, so the whole biological filter bed is basically in an aerobic state during normal operation, so the main body of the bed is aerobic bacteria, and the removal effect on organic matter Better, but lack of anaerobic and anoxic environment, the denitrification and removal of nitrogen in sewage is extremely limited; and after adopting the operation mode of intensive aeration, because the main flow direction of the water body is in the form of top-down, so in the biological filtration The upper layer of the bed is mainly composed of aerobic bacteria, while the middle and lower part of the packing layer is mainly composed of anaerobic or anaerobic bacteria because oxygen is difficult to reach, so that the entire biological filter bed has the ability to degrade organic matter and at the same time The function of nitrification and denitrification denitrification;

[0007] ②The traditional biological aerated filter mostly adopts the support plate with filter head and filter cap. During the long-term operation, due to the continuous increase of the suspended solids, the large-scale reproduction of microorganisms and the shedding biofilm, the support plate The filter cap on the top of the filter head is easy to block, which often leads to uneven water distribution and gas distribution, which affects the treatment effect; because the water distribution and supporting device at the bottom of the device adopts a grid plate or a strip-shaped hole supporting layer, it has a relatively The larger flow area will not cause blockage, and the effect of internal circulation makes the flow rate several times or even dozens of times that of the normal water inflow, and the relatively uniform water distribution of the supporting layer can be ensured through large flow water distribution

[0012] In summary, the traditional biological aerated filter and the later improved internal circulation biological aerated filter have obvious defects in the actual application process, which affects the promotion and application of this type of technology

Its main manifestations are: either it has a certain decarburization effect (except CODcr), but its denitrification effect is poor, and the suspended solids (SS) in the effluent are high; or it has a certain denitrification effect and the suspended solids (SS) in the effluent ) content can be controlled at a low level, but the function of removing organic matter is not ideal

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