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Optimization method of A2O biological nitrogen and phosphorus removal reflux ratio

A technology for biological denitrification and optimization methods, applied in chemical instruments and methods, reflux water treatment, sustainable biological treatment, etc., to achieve the effect of optimizing power consumption, power consumption and chemical consumption saving

Active Publication Date: 2021-05-14
联合环境技术(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, how to accurately evaluate and optimize the biological phosphorus release effect of anaerobic ponds is also a challenge in operation

Method used

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  • Optimization method of A2O biological nitrogen and phosphorus removal reflux ratio
  • Optimization method of A2O biological nitrogen and phosphorus removal reflux ratio

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Effect test

Embodiment 1

[0056] A slaughter sewage plant treats 15000m of water 3 / d or 625m 3 / h, the process is anaerobic, anoxic and aerobic A 2 The O process is followed by a secondary settling tank and a high-efficiency inclined plate settling tank. In order to realize effective biological denitrification and phosphorus removal, according to the method of the present invention, the TN concentration of the influent supernatant of the anaerobic tank is sampled and measured to be 80 mg N / L, TP The concentration is 27mg P / L, PO 4 3- The concentration is 17mg / L, the total nitrogen concentration effluent discharge standard is 15mg N / L, and the total phosphorus concentration effluent discharge standard is 0.5mg P / L. According to the calculation formula of the inventive method, the denitrification total nitrogen removal rate is required to be 75%, and the internal reflux ratio R2 is calculated to be 340%, so the set internal reflux pump flow rate is 2125m 3 / h; the DO concentration of the internal re...

Embodiment 2

[0058] A municipal water plant treats 30,000m of water 3 / d or 1250m 3 / h, the process route is that the process is anaerobic, anoxic and aerobic A 2 O+MBR. On-site operation of the aerobic tank to the anoxic tank has a reflux ratio of 350%, and the anoxic tank to the anaerobic tank has a reflux ratio of 150%. At the same time, the DO concentration of the mud-water mixture near the internal reflux pump area is as high as 3.5mg / L. On-site It is necessary to add 50mg / L glucose to ensure that the total nitrogen stability reaches the standard. According to the method of the present invention, it is 30mg N / L, PO 4 3- The concentration is 1.0mg P / L, TP concentration is 2.0mg P / L; the effluent discharge standard for total nitrogen concentration is 15mg N / L, and the effluent discharge standard for total phosphorus concentration is 0.5mg P / L. According to the calculation formula of the inventive method, the denitrification total nitrogen removal rate is required to be 55%, and the ...

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Abstract

The invention provides an optimization method of an A2O biological nitrogen and phosphorus removal reflux ratio. The optimization method comprises the following steps of: (1) determining a total nitrogen removal rate and an internal reflux ratio according to the total nitrogen concentration of supernatant before adoption of a biological nitrogen and phosphorus removal system; (2) optimizing the internal reflux from an aerobic tank to an anoxic tank, and ensuring the anoxic environment of the anoxic tank to promote total nitrogen removal, improve the utilization efficiency of a carbon source and enable the total nitrogen of effluent to reach the standard; and (3) optimizing the reflux ratio from the anoxic tank or a secondary sedimentation tank to the anaerobic tank in biological phosphorus removal. According to the optimization method of an A2O biological nitrogen and phosphorus removal reflux ratio, a water plant can be guided to optimize the treatment effect of biological nitrogen and phosphorus removal, a sewage plant can also be guided to reduce waste caused by high DO concentration consumption brought back by internal reflux of a carbon source by optimizing the internal reflux ratio, the power consumption of an aeration fan and a reflux pump of an aerobic tank is optimized, and by optimizing the reflux ratio of the anaerobic tank, the biological phosphorus removal effect is improved, the chemical consumption of a subsequent deep chemical phosphorus removal agent can be reduced, and finally, the power consumption and the chemical consumption are reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a kind of A 2 O optimization method for biological nitrogen and phosphorus removal reflux ratio. Background technique [0002] Biological denitrification in sewage is mainly to oxidize ammonia nitrogen into nitrate nitrogen or nitrite nitrogen through nitrification reaction in aerobic pond, and then convert nitrate nitrogen or nitrite nitrogen through denitrification reaction in anoxic pond or anaerobic pond into nitrogen to achieve total nitrogen TN removal. Among them, the denitrification reaction process needs to provide enough carbon sources to ensure the effective removal of total nitrogen and discharge up to the standard. Biological phosphorus removal is mainly that phosphorus accumulating bacteria synthesize PHA by using easy biochemical COD in the anaerobic tank and release inorganic phosphate radicals, then in the aerobic tank, phosphorus accumulating bacteria use ...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F3/34C02F101/30C02F101/38
CPCC02F3/30C02F3/308C02F3/34C02F2101/30C02F2101/38C02F2209/08C02F2301/04Y02W10/10
Inventor 郭成洪张河民林玉程李力阎怀国郭海军王津利
Owner 联合环境技术(天津)有限公司
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