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Reinforced-denitrification MBR (membrane bioreactor) sewage treatment method

A sewage treatment method and denitrification technology, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Efficient removal of phosphorus, difficult to treat with urban sewage, etc., to achieve the effect of improving sedimentation effect, strong activity, and stable denitrification effect

Active Publication Date: 2013-04-10
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the actual C / N ratio of urban sewage in my country is generally low, and the lack of organic carbon sources is a bottleneck that cannot improve the efficiency of biological nitrogen and phosphorus removal.
Due to the problem of carbon sources, it is difficult for these biological denitrification and phosphorus removal processes to achieve efficient removal of nitrogen and phosphorus at the same time
Compared with phosphorus removal, due to nitrogen compounds (such as NH 4 + and NO 3 - The molecular weight of ) is relatively small, and it is impossible to apply chemical denitrification by adding chemicals. The cost of denitrification by reverse osmosis, stripping method, ion exchange method, etc. is high, and it is difficult to use in large-scale urban sewage treatment.

Method used

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  • Reinforced-denitrification MBR (membrane bioreactor) sewage treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: The concentration of ammonia nitrogen in the incoming water is not high, and the sewage treated by facilities such as fine screens, grit chambers, fine screens (membrane screens) and 300% to 400% of the sludge in the return sedimentation tank enter the anoxic tank 1 , the hydraulic retention time is 4.0-5.0h, the sludge concentration is 4.5-6.0g / L, the outflow of the anoxic tank and the 200%-400% reflux membrane tank nitrification liquid enter the ② sedimentation tank, the residence time is 4.0h, the sedimentation tank part Sludge backflow, part of the sludge discharge, the outflow of the sedimentation tank enters the ③ membrane tank, the hydraulic retention time is 2.0-3.0h, and 10%-12% of embedded nitrifying bacteria are added, and the embedded nitrifying bacteria are intercepted at the return flow of the nitrifying liquid The device uses a pump to intermittently suck water out of the membrane filament, and the water out is discharged or reused.

Embodiment 2

[0037] Example 2: When the concentration of ammonia nitrogen in the incoming water is high, the sewage treated by facilities such as fine screens, grit chambers, fine screens (membrane screens) and 200% to 400% of the sludge in the return sedimentation tank and about 100% The nitrifying liquid in the backflow membrane tank enters the anoxic tank, the hydraulic retention time is 5.0-6.0h, the sludge concentration is 5.0-8.0g / L, the outflow of the anoxic tank and 300%-400% of the nitrifying liquid in the backflow membrane tank enters the ② Sedimentation tank, the residence time is 4.0h, part of the sludge in the sedimentation tank is refluxed, part of the sludge is discharged, the outflow of the sedimentation tank enters the ③ membrane tank, the hydraulic retention time is 2.5-3.5h, and 12%-15% of embedded nitrifying bacteria are added , A carrier interception device is installed at the reflux of the nitrifying liquid, and the pump intermittently sucks the water out of the membra...

Embodiment 3

[0038] Example 3: When the phosphorus content in the incoming water is high and the phosphorus in the effluent cannot meet the standard, the sewage treated by fine screens, grit chambers, fine screens (membrane screens) and other facilities and 200% to 400% of the sludge in the return sedimentation tank (and about 100% of the nitrifying liquid in the backflow membrane tank) enters ① the anoxic tank, the hydraulic retention time is 4.0-6.0h, the sludge concentration is 4.5-8.0g / L, the outflow of the anoxic tank and the reflux of 200%-400% The nitrification liquid in the membrane tank enters the ② sedimentation tank, the residence time is 4.0h, part of the sludge in the sedimentation tank is refluxed, and part of the sludge is discharged, and the outflow of the sedimentation tank enters the ③ membrane tank, and the chemical phosphorus removal agent is added to the water inlet, and the hydraulic retention time is 2.0 ~ 3.5h, add 10% ~ 15% of embedded nitrifying bacteria, install c...

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Abstract

The invention relates to a reinforced-denitrification MBR (membrane bioreactor) sewage treatment method which comprises steps as follows: (1) pretreated town sewage enters an anoxic tank together with 300-400% of reflux precipitation tank sludge and 200-400% of reflux membrane tank nitrification solution, and denitrifying bacteria reduce nitrate nitrogen carried by reflux into nitrogen by using a carbon source in the sewage; (2) the effluent of the anoxic tank enters a precipitation tank to be subjected to sludge-water separation together with the refluxed membrane tank nitrification solution, part of the precipitated sludge refluxes to the anoxic tank, and the rest of sludge is discharged; and (3) the effluent of the precipitation tank enters a membrane tank to be nitrified so as to oxidize ammonia nitrogen into nitrate nitrogen, a pump extracts water from the membrane tank via the intervals of the membrane, and the effluent water is discharged or reused. The invention sufficiently combines the inherent characteristics of the MBR and MBBR (moving bed biofilm reactor) techniques, reduces the influence of the biological denitrification influencing factor, and has the characteristics of high denitrification efficiency, high denitrification stability, simple process and the like.

Description

Technical field: [0001] The invention belongs to the technical field of environmental protection sewage treatment, and in particular relates to an MBR sewage treatment method for strengthening denitrification. Background technique: [0002] With the full implementation of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002, from 2007 onwards, many large and medium-sized cities' early construction sewage treatment plants have entered a period of standard upgrading and upgrading. In the process of standard upgrading, upgrading and transformation of sewage treatment plants, and the implementation of Class I A standards, some key issues and technical bottlenecks in urban sewage treatment in my country have become more prominent, such as low C / N ratio of sewage and low-temperature nitrification. And problems such as limited land occupation of sewage plants. Faced with the strict requirements of the first-level A standard, the exposure and final solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 陈立郭兴芳申世峰
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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