Method for adjusting biological nitrogen and phosphorus removal by using concentration gradient

A concentration gradient, biological denitrification technology, applied in sustainable biological treatment, chemical instruments and methods, water treatment parameter control, etc. , the total nitrogen in the effluent exceeds the standard, etc., to achieve the effect of ensuring the dosage of the agent and the air volume of the fan

Active Publication Date: 2021-06-11
联合环境技术(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, when sewage plants detect DO in anoxic pools or aerobic pools, they generally only detect at a fixed position; at the same time, when detecting parameter concentrations, they generally only detect water in anaerobic pools, anoxic pools, and aerobic pools. The concentration of some parameters can be detected at the terminal, so the obtained data cannot comprehensively and accurately reflect the specific operation status of each process section, so that it is impossible to accurately adjust the biological nitrogen and phosphorus removal and realize energy saving and consumption reduction
In the prior art, the mode of sampling at a single position of a process section and controlling a single parameter is used. At the same time, only one parameter of nitrate nitrogen concentration is used to control the reflux ratio and biological denitrification. This control mode has great risks, because The total nitrogen concentration in the effluent of the anoxic pool may be due to insufficient carbon sources in the anoxic pool, so that the denitrification only stays at the stage of nitrite nitrogen instead of the stage of nitrogen, so that even if the concentration of nitrate nitrogen at the outlet of the anoxic pond is very low, it is sub- The nitrate nitrogen concentration is still high, making the total nitrogen concentration higher than the total nitrogen effluent discharge standard, resulting in the risk of effluent total nitrogen exceeding the standard
At present, there is no method to adjust the biological nitrogen and phosphorus removal by detecting the concentration of multiple parameters at different positions in the anaerobic pond, anoxic pond and aerobic pond; and the sewage plant also urgently needs a more effective and perfect method to adjust Biological nitrogen and phosphorus removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] The designed treatment capacity of an industrial wastewater plant is 160,000 tons / day, and the actual treatment capacity is 125,000 tons / day; the process route is pre-coagulation + hydrolytic acidification + anaerobic / anoxic / aerobic + MBR + ozone contact oxidation + post-mixing Coagulation precipitation. The internal reflux ratio from the aerobic pool to the anoxic pool is 200%, and the external reflux ratio from the anoxic pool to the anaerobic pool is 200%. There is no need to add carbon sources on site, and the air volume of the fan in the aerobic pool is 555m3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the TP concentration effluent discharge standard is 0.3mg P / L. After the on-site biological phosphorus removal, the biochemical tank MBR needs to add polyaluminum chloride PAC to the post-coagulation sedimentation tank and ferric chloride FeCl 3 After further in-depth chemical phosphorus removal, the total phosphorus concentration in the e...

Embodiment 2

[0127] A printing and dyeing water plant treats 15,000 tons of water per day. The process route is pre-coagulation + hydrolytic acidification + anoxic / aerobic + secondary sedimentation tank + ozone contact oxidation. The internal reflux ratio from the aerobic tank to the anoxic tank is 600%, and the external reflux ratio from the secondary sedimentation tank to the anoxic tank is 160%. Glucose dosage is 120mg / L in the anoxic tank on site, and the aerobic tank runs the fan Air volume 56m 3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the actual TN concentration of the effluent on site is 16-20mg N / L, which cannot meet the standard.

[0128] According to the method described in the present invention:

[0129] (1) In the anoxic pool, the DO concentration is detected at the backflow inlet, 1 / 10, 1 / 5, and 1 / 2 of the anoxic pool along the water flow direction. Detect the pH, COD concentration, TN concentration and nitrate nitrogen concentration of the su...

Embodiment 3

[0137] A chemical wastewater plant treats 10,000 tons per day. The process route is Fenton + hydrolytic acidification + anoxic / aerobic + MBR + ozone contact oxidation + high-efficiency sedimentation tank. The internal reflux ratio from the aerobic tank to the anoxic tank is 400 %, glucose is added to the anoxic pool on site as a carbon source; the air volume of the fan is 61m 3 / min, the TN concentration effluent discharge standard is 15mg N / L, and the actual TN effluent concentration on site is 16-18mg N / L, which cannot meet the standard.

[0138] According to the method disclosed in the present invention:

[0139] (1) The concentration of DO was detected at the inner return water inlet of the anoxic pool along the water flow direction, 1 / 10, 1 / 5 and 1 / 4 respectively, and at the same time, at the water inlet of the anoxic pool Detect pH at 1 / 2, 3 / 4 and the end along the water flow direction, TN concentration, COD concentration and nitrate nitrogen concentration of the supern...

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PUM

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Abstract

The invention provides a method for adjusting biological nitrogen and phosphorus removal by using a concentration gradient. The method comprises the following steps: (1) detecting concentrations of parameters at different positions in an anaerobic tank, an anoxic tank and an aerobic tank along a water flow direction; (2) comparing the detected concentration with a corresponding theoretical concentration gradient trend, and adjusting parameters which do not accord with the corresponding theoretical concentration gradient trend; and (3) after the operation is adjusted, repeatedly detecting the key parameters which do not accord with the corresponding theoretical concentration gradient trend. According to the method for adjusting biological nitrogen and phosphorus removal by using the concentration gradient, numerical values obtained according to certain parameters detected at different positions in an anaerobic tank, an anoxic tank and an aerobic tank in a biological nitrogen and phosphorus removal process are combined with an actual operation effect; therefore, biological nitrogen and phosphorus removal is guided and accurately adjusted to ensure that the total nitrogen, total phosphorus and ammonia nitrogen of effluent stably reach the standard, and meanwhile, the dosage of a carbon source, the dosage of a chemical phosphorus removal agent and the air volume of a fan are adjusted to achieve the effects of saving energy and reducing consumption.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for adjusting biological denitrification and dephosphorization by using a concentration gradient. Background technique [0002] The biochemical system is mainly used in sewage treatment to remove COD and biological nitrogen and phosphorus removal. Biological denitrification is mainly to change ammonia nitrogen into nitrate nitrogen or special short-range nitrification reaction into nitrite nitrogen in the aerobic tank through nitrification reaction, and then use the internal reflux pump to remove the nitrate nitrogen or nitrite nitrogen in the aerobic tank Return to the anoxic tank to generate nitrogen through denitrification reaction to achieve the removal of total nitrogen. The biological phosphorus removal is mainly the process of biological phosphorus release by using easily biochemical COD in the anaerobic tank, and then the biological phosphorus absorpt...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/30C02F2209/08C02F2209/18C02F2209/15C02F2209/22C02F2209/16C02F2209/06Y02W10/10
Inventor 郭成洪林玉程李力张河民阎怀国郭海军史英君洪刚
Owner 联合环境技术(天津)有限公司
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