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A<2>/O and MBR combined sewage regenerating process and device

A regeneration device and sewage technology, which is applied in the field of water treatment, can solve the problems of difficult biological treatment, low nitrogen and phosphorus removal efficiency, and high self-control requirements, to achieve enhanced biological nitrogen and phosphorus removal functions, increase operational flexibility, and operate Good flexibility

Inactive Publication Date: 2014-07-02
CHINA UNION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intermittent cycle operation of the process has high requirements for self-control; variable water level operation requires large power consumption; the efficiency of nitrogen and phosphorus removal is not very high, and the sludge stability is poor
3)A 2 / O series process: It has simple process flow, high pollutant removal efficiency, stable operation, good impact load resistance, and good sludge settlement performance, but the sludge concentration in the system is low, and the sludge returns to the anaerobic tank , with high nitrate concentration, competing with phosphorus accumulating bacteria for organic carbon sources, unable to meet the requirements of nitrogen and phosphorus removal at the same time
[0003] like figure 1 Traditional A shown 2 / O process flow chart, which only adopts secondary biochemical treatment process, and the effluent can not meet the regeneration and reuse standard. It is difficult to further biological treatment mainly for total nitrogen, total phosphorus, chroma, etc., and advanced treatment process must be added

Method used

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  • A&lt;2&gt;/O and MBR combined sewage regenerating process and device
  • A&lt;2&gt;/O and MBR combined sewage regenerating process and device
  • A&lt;2&gt;/O and MBR combined sewage regenerating process and device

Examples

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Effect test

Embodiment 1

[0027] Taking the influent of a sewage treatment station in the core area of ​​a new city as an example after pretreatment (mechanical grille, regulating tank, membrane grille), the influent COD, ammonia nitrogen and total phosphorus values ​​(COD= 100-400mg / L, ammonia nitrogen= 10-40mg / L, TP=2.5-3.5mg / L). The hydraulic retention time (HRT) of the deaerobic, anaerobic, anoxic and aerobic zones are 0.5h, 1h, 2.5h and 3h respectively, the mixed liquor reflux ratio is 200%, and the sludge reflux ratio is 100%. When the sewage water temperature is higher than 15°C, run the biological denitrification and phosphorus removal mode to carry out biological nitrogen and phosphorus removal; when the water temperature is ≤15°C, run the biological denitrification mode and add 30mg / L aluminum sulfate to the aerobic pool. The MBR membrane bioreactor uses hollow fiber membrane modules. The effluent of the treatment device meets the water quality standards for urban greening water and toilet f...

Embodiment 2

[0029] Example 2 is a reclaimed water treatment station project in a scenic lake. The difference from Example 1 is that a deep chemical phosphorus removal process is added after the MBR membrane bioreactor exits the water, and the dosage of polyaluminum chloride is 30mg / L; the water temperature is ≤15°C When running the denitrification mode, add 20mg / L polyaluminum chloride to the aerobic tank. Depth filtration adopts active sand filter, and the selected filtration speed is 5m 3 / (m 2 . Due to the addition of a deep chemical phosphorus removal process, the effluent after treatment meets the "Water Quality of Urban Sewage Recycling Landscape Environment" (GB / T 18920-2002) standard.

[0030] It can be concluded from Examples 1 and 2 that after sewage regeneration treatment by this process, the effect of nitrogen and phosphorus removal is good, the process operation flexibility is high, and the effluent quality can reach the water quality standard of urban miscellaneous water; ...

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Abstract

The invention discloses an A<2> / O and MBR combined sewage regenerating process. The sewage is discharged after being sequentially processed by an anaerobic tank, an anoxic pool, an aerobic pool and an MBR membrane pool. The process is characterized by also comprising the steps of deoxidizing a mixed solution inside the MBR membrane pool through a deoxidation pool and then returning to the anaerobic tank or the anoxic pool. The invention also comprises an A<2> / O and MBR combined sewage regenerating device. The improved A<2> / O and MBR combined sewage regenerating process and device disclosed by the invention have the advantages of being high in denitrification and dephosphorization efficiency, stable to run, good in operation flexibility, high in effluent quality, and the like. The effluent can achieve the water quality standard of reclaimed water reuse, and the process is an ideal sewage treatment process combining biological treatment with advanced treatment.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to the improved type A 2 / O + MBR combined sewage regeneration process and its device. Background technique [0002] During the "Twelfth Five-Year Plan" period, along with the upgrading and transformation of sewage treatment plants, the proportion of reclaimed water reuse has continued to increase, and higher requirements have been put forward for sewage treatment processes and effluent standards. In order to meet the national standards for urban sewage recycling and utilization, the secondary biochemical treatment in the sewage treatment process usually needs to have the function of nitrogen and phosphorus removal, which generally includes alternating cycles of three different processes: anaerobic, anoxic, and aerobic, and suspension-type actives are often used There are three main series of sludge method: oxidation ditch series, sequencing batch reactor (SBR) series, A 2 / O series...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 黄重成张萍黄周蔚
Owner CHINA UNION ENG
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