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Short-cut denitrification system and method combining coal chemical industry wastewater outside loop moving bed reactor and biological aerated filter

A technology of moving bed biofilm and aerated biological filter is applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problems of poor removal of total nitrogen in water, etc. Achieve the effect of excellent removal effect and excellent total nitrogen removal effect

Inactive Publication Date: 2014-09-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing low C / N ratio industrial wastewater denitrification process has a poor removal effect on total nitrogen in water, and to provide a coal chemical wastewater external circulation moving bed biofilm reactor and aerated biological filter Combined short-range denitrification system and method

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  • Short-cut denitrification system and method combining coal chemical industry wastewater outside loop moving bed reactor and biological aerated filter

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specific Embodiment approach 1

[0019] Specific implementation mode 1: In this embodiment, the combined short-range denitrification system of coal chemical wastewater external circulation moving bed reactor and biological aerated filter consists of moving bed biofilm reactor 1, sedimentation tank 2, biological aerated filter 3, air Compressor 4, clear water tank 5, sludge return pump 6, nitrifying liquid return pump 7, water inlet pipe 8, moving bed biofilm reactor outlet pipe 9, sludge return pipe 10, sedimentation tank outlet pipe 11, outlet pipe 12, The nitrifying liquid return pipe 13, the compressed air pipe 14 and the clean water pipe 15 are composed;

[0020]The carrier 1-1 is filled in the moving bed biofilm reactor 1, the water inlet pipe 8 communicates with the water inlet at the bottom of the moving bed biofilm reactor 1, and the moving bed biofilm reactor 1 passes through the moving bed biofilm reactor outlet pipe 9 and The central pipe 2-2 in the sedimentation tank 2 is connected to each other, ...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the carrier 1-1 is a polyethylene disc in the moving bed biofilm reactor 1, the diameter of the disc is 22mm, the thickness is 1mm, and the density is 0.8g / cm 3 , The carrier filling rate is 35%. Other devices are the same as in the first embodiment.

[0023] In this embodiment, before the operation of the moving bed biofilm reactor, the carrier needs to undergo 30 days of film-hanging acclimation. The process of film-hanging domestication is to put the disc-shaped carrier into the anoxic sludge for intermittent cultivation. The initial concentration of the inoculated sludge is 3000mgVSS / L, after 30 days of film-hanging, a uniform and stable biofilm is formed on the surface of the carrier, and the biomass on the carrier is 0.28g / g.

specific Embodiment approach 3

[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the filter material 3-1 in the biological aerated filter 3 is a ceramsite homogeneous filter material, with an average diameter of 2 mm, a shape factor of 0.63, and a true density 1.5g / cm 3 , bulk density 0.86g / cm 3 , porosity 42.5%. Other devices are the same as those in Embodiment 1 or 2.

[0025] The filter materials in this embodiment are arranged in layers, and the height between filter layers is 1.2m. Before the operation of the biological aerated filter, the filter material needs to be acclimatized by hanging film for 30 days. The initial concentration of inoculated sludge on the filter material is 2500mgVSS / L, the dissolved oxygen is controlled at 2mg / L, and the acclimatization temperature is 30°C.

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Abstract

The invention discloses a short-cut denitrification system and a method combining a coal chemical industry wastewater outside loop moving bed bio-membrane reactor and a biological aerated filter, relates to a short-cut denitrification for coal chemical industry wastewater, and in particular relates to a denitrification system and a treatment method for industry wastewater which is difficult to degrade and low in C / N ratio. The short-cut denitrification system is formed by serially connecting a moving bed bio-membrane reactor, a sedimentation tank and a biological aerated filter. The denitrification method comprises steps of I, promoting coal chemical industry wastewater to flow into a water inlet pipe, and enabling wastewater and returned sludge to flow into the moving bed bio-membrane reactor together with nitrifying liquid, so as to contact with a carrier for a short-cut denitrification reaction; II, delivering water out of the bio-membrane reactor into the sedimentation tank, and settling to obtain supernatant and returned sludge; and III, delivering the supernatant into the biological aerated filter to contact with a filter material biological membrane for a biochemical reaction, and returning one part of the nitrifying liquid to the moving bed bio-membrane reactor while discharging the other part as purified water. The denitrification method has an excellent effect of removing total nitrogen in the coal chemical industry wastewater, and is mainly applicable to the treatment of industry wastewater low in C / N ratio.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a short-range denitrification method for coal chemical wastewater, in particular to a denitrification system and treatment method for refractory industrial wastewater with a low C / N ratio. Background technique [0002] With the frequent occurrence of eutrophication in water bodies around the world, the denitrification of sewage and wastewater is still a hot topic of research by scholars at home and abroad. The most widely used denitrification process is still the traditional A / O process. This process is Developed according to the classic three-stage denitrification theory, the sewage completes two-stage nitrification in the aerobic tank, so that the ammonia nitrogen is oxidized to nitrate nitrogen after passing through the nitrite nitrogen, and the effluent after aerobic treatment enters the anoxic tank, where the low-oxidation The denitrification reaction is completed under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 韩洪军侯保林庄海峰贾胜勇徐鹏赵茜靳博唐安琪徐春艳方芳张凌瀚
Owner HARBIN INST OF TECH
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