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Method for optimizing controlling denitrification and phosphorus release in double precipitation pool by A2/O technique

An optimized control, secondary sedimentation tank technology, applied in aerobic and anaerobic process treatment, etc., can solve problems such as low compliance rate and unstable treatment effect of single-sludge biological nitrogen and phosphorus removal process

Active Publication Date: 2010-06-09
SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The single sludge biological denitrification and phosphorus removal process caused by denitrification and phosphorus release in the secondary sedimentation tank is unstable and the compliance rate is low, which is a common problem faced by large-scale biological nutrient removal sewage treatment plants.

Method used

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  • Method for optimizing controlling denitrification and phosphorus release in double precipitation pool by A2/O technique
  • Method for optimizing controlling denitrification and phosphorus release in double precipitation pool by A2/O technique
  • Method for optimizing controlling denitrification and phosphorus release in double precipitation pool by A2/O technique

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Embodiment Construction

[0016] 1 During the test, synthetic beer wastewater (COD=251-406mg / L, total nitrogen TN=41-78mg / L and total phosphorus TP=7.1-11.5mg / L) was used, the hydraulic retention time was 9h, and the sludge age was 10- On 12 days, the sludge concentration is 3500±100mg / L, the pH of the influent is controlled at 7.2-7.6, and the temperature is controlled at 20-23°C by the heating rod. When the DO concentration of the secondary sedimentation tank is 0.66mg / L, when the sludge bed When the height is higher than 2 / 3 of the effective height of the secondary settling tank, when the nitrate concentration is 13mg / L, the nitrate concentration in the return sludge is always less than 2mg / L. The correlation coefficient between the concentration of nitrate at the end of the area and the degree of denitrification in the secondary sedimentation tank is 0.9399. There is a negative correlation between the concentration of nitrate in the effluent of the aerobic zone and the release of phosphorus, and th...

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Abstract

The invention discloses a denitrifying and phosphoric discharge optimum controlling means in A2 / O craft secondary settling tank in waste water biological treating system domain, which is characterizedby the following: using DO on-line sensor, nitrate on-line sensor and sludge level gage; monitoring on line; indicating generating degree of denitrifying and phosphoric discharge in the secondary settling tank; adjusting discharge of inner circulating pump when the measured value higher than setting range; increasing inner circulating ratio; controlling the density of water inlet nitrate in the secondary settling tank; adjusting discharge of the sludge circulating pump when the measured value of the sludge level gage deviate setting range; enlarging sludge return ratio; decreasing height of the sludge layer; providing reliable operating condition for water outlet emission standard of A2O craft; realizing high efficiency and low consumption.

Description

technical field [0001] The technical field of the invention is: optimization control method and technology of sewage biological treatment system. Background technique [0002] The main functions of the secondary settling tank are clarification, solid-liquid separation and solid storage. If there is a problem with the operation of the secondary settling tank, it will cause a large amount of suspended matter to be carried in the effluent of the system, thereby affecting the removal effect of the entire system, usually manifested as total suspension in the effluent As the solid concentration (TSS) increases, the corresponding effluent biological oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen and total phosphorus concentration will increase significantly. In addition to completing the main function of solid-liquid separation, the secondary sedimentation tank will also undergo multiple biochemical reactions under different environmental conditions. For example,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻王晓莲王淑莹
Owner SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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