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

A technology for ammonia nitrogen wastewater and treatment methods, 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, achieving low cost, high equipment utilization, and The effect of short processing cycles

Inactive Publication Date: 2009-10-14
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

Examples

Experimental program
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Effect test

Embodiment 1

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

[0023] The effluent then enters the chemical precipitation tank. According to the molar ratio of Mg:N:P of 1.5:1:1, magnesium sulfate and sodium dihydrogen phosphate are added, the pH value is adjusted to 9, the reaction is stirred for 30min, and then left standing for 50min. The generated ammonium phosphate The magnesium precipitation is discharged from the precipitation outlet at the bottom of...

Embodiment 2

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

[0027] The effluent then enters the chemical precipitation tank, adding magnesium chloride and disodium hydrogen phosphate according to the molar ratio of Mg:N:P of 1.6:1:1, adjusting the pH value to 9, stirring and reacting for 30min, and then standing for 50min, the generated ammonium phosphate The magnesium precipitation is discharged from the precip...

Embodiment 3

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

[0031] The effluent then enters the chemical precipitation tank, adding magnesium chloride and sodium phosphate according to the molar ratio of Mg:N:P of 1.6:1:1, adjusting the pH value to 9, stirring the reaction for 25min, and then standing for 60min, the generated magnesium ammonium phosphate precipitates It is discharged from the sedimentation ou...

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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 is added 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 1-1.1 times 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 various technologies, and belongs to the technical field of wastewater treatment. Background technique [0002] In recent years, with the increasing expansion of urban population and the continuous development of industry and agriculture, water pollution accidents have occurred frequently, causing serious harm to humans and animals. The discharge of nitrogen and phosphorus in many lakes and reservoirs causes water eutrophication, which seriously threatens the production, life and ecological balance of human beings. Ammonia nitrogen is one of the main factors that cause water eutrophication, and it is widely derived from wastewater discharged from industrial production such as fertilizer, metallurgy, coking, and food. How to prevent and eliminate the impact of ammonia nitrogen on the ecological environment is one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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