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Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination

A technology of ammonia nitrogen wastewater and treatment method, which is applied in the field of high concentration ammonia nitrogen wastewater treatment, can solve the problems of difficulty in ensuring wastewater discharge standards, large investment in wastewater treatment projects, and difficulty in producing wastewater, and achieves short wastewater treatment cycle and equipment utilization rate High, fast response effect

Inactive Publication Date: 2011-02-09
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. At present, only one method is used to treat high-concentration ammonia-nitrogen wastewater alone, and it is difficult to ensure that the wastewater meets the discharge standard, and the treatment cost is high
[0006] 2. At present, the method of pretreatment of ammonia nitrogen wastewater to reduce the concentration of ammonia nitrogen and then biochemical treatment is used. This method has a better treatment effect on wastewater with better biochemical properties, but it is difficult to work on wastewater with poor biochemical properties, and The operation is complex, the treatment cycle is long, and the investment in wastewater treatment projects is large

Method used

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  • Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination
  • Method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination

Examples

Experimental program
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Effect test

Embodiment 1

[0022] First inject 1m into the pH adjustment pool 3 The concentration of ammonia nitrogen is 3900mg / L, COD is 189mg / L, and waste water with BOD / COD=0.1, add 9kg calcium hydroxide and 1.8kg sodium hydroxide according to the mass ratio of 5:1, adjust the pH=11.8, and then pump the waste water Lift to stripping tower (ratio of height to diameter of stripping tower is 7: 1, internal packing is Pall ring), carry out stripping at gas-liquid ratio of 3500, the waste gas blown out is absorbed by ammonia absorption tower, and the concentration of effluent ammonia nitrogen is 900mg / L.

[0023] The effluent then enters the chemical precipitation tank, adding magnesium sulfate and sodium dihydrogen phosphate according to the molar ratio of Mg:N:P of 1.5:1:1, adjusting the pH value to 9, stirring for 30 minutes, and then standing for 50 minutes, the resulting ammonium phosphate Magnesium precipitation is discharged from the precipitation outlet at the bottom of the chemical precipitation...

Embodiment 2

[0026] First inject 1m into the pH adjustment pool 3 The concentration of ammonia nitrogen is 4100mg / L, the COD is 489mg / L, and the waste water with BOD / COD=0.32, respectively add 9.5kg calcium hydroxide and 1.9kg sodium hydroxide according to the mass ratio of 5:1, adjust the pH=12, and then pass the pump Lift the waste water to the stripping tower (the height-to-diameter ratio of the stripping tower is 7:1, and the inner filler is a Pall ring), and strip it at a gas-liquid ratio of 3500. The waste gas blown out is absorbed by the ammonia absorption tower, and the ammonia nitrogen in the effluent is The concentration is 920mg / L.

[0027] Then enter the chemical sedimentation tank, add magnesium chloride and disodium hydrogen phosphate according to the molar ratio of Mg:N:P 1.6:1:1, adjust the pH value to 9, stir and react for 30 minutes, and then let it stand for 50 minutes, the resulting ammonium phosphate Magnesium precipitation is discharged from the precipitation outlet ...

Embodiment 3

[0030] First inject 1m into the pH adjustment pool 3 The concentration of ammonia nitrogen is 4100mg / L, the COD is 489mg / L, and the waste water with BOD / COD=0.32, respectively add 9.2kg calcium hydroxide and 2.3kg sodium hydroxide according to the mass ratio of 4:1, adjust the pH=12.2, and then pass the pump Lift the waste water to the stripping tower (the height-to-diameter ratio of the stripping tower is 7:1, and the inner filler is a Pall ring), and strip it at a gas-liquid ratio of 3700. The waste gas blown out is absorbed by the ammonia absorption tower, and the ammonia nitrogen in the effluent is The concentration is 850mg / L.

[0031] Then enter the chemical precipitation tank, add magnesium chloride and sodium phosphate according to the molar ratio of Mg:N:P 1.6:1:1, adjust the pH value to 9, stir the reaction for 25 minutes, and then let it stand for 60 minutes, and the generated magnesium ammonium phosphate precipitates It is discharged from the sedimentation outlet ...

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Abstract

The invention relates to a method for treating highly concentrated ammonian wastewater with poor biodegradability by using a multiple-technique combination, which belongs to the technical field of wastewater treatment. The method is characterized in that: the ammonian wastewater primarily enters a pH adjusting tank for adjusting the pH value to be 11-12.5 and enters a blow-off tower for blowing off with the gas-liquid ratio being 3000-4500, the blown-off wastewater enters a chemical precipitation tank, magnesium salts and phosphates are added according to the mol ratio of Mg : N : P being 1.4-1.7:1:1 for reacting with the wastewater to generate ammonium magnesium phosphate precipitate for removing ammonian, yielding water enters a break point chlorination tank, chlorine-containing oxide isadded according to the weight ratio Cl / N being 9-12:1 of active chlorine and ammonian, the wastewater is transferred to a reducing tank after the reaction, reducing agent is added according to 1-1.1times of theoretical mol value of the yielding water completely reacting with residual chlorine, and the wastewater can be directly discharged after the reaction. The treatment method has simple operation, high reaction speed and low wastewater treatment cost, and can lead ammonian to be recovered without secondary pollution to environment; and the yielding water can reach primary emission standard.

Description

technical field [0001] The invention relates to a method for treating high-concentration ammonia-nitrogen wastewater with poor biodegradability by combining multiple technologies, belonging to the technical field of wastewater treatment. Background technique [0002] In recent years, with the increasing urban population and the continuous development of industry and agriculture, water pollution accidents have occurred frequently, posing serious harm to humans and animals. The discharge of nitrogen and phosphorus in many lakes and reservoirs has caused water eutrophication, which seriously threatens human production, life and ecological balance. Ammonia nitrogen is one of the main factors causing eutrophication of water bodies, and it is widely derived from wastewater discharged from industrial production such as chemical fertilizers, metallurgy, coking, and food. How to prevent and eliminate the impact of ammonia nitrogen on the ecological environment is one of the main tas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/20C01B25/45
Inventor 黄海明肖贤明晏波
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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