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Method for treating sewage generated in ammonia synthesis process using coal as raw material

A technology for synthesizing ammonia and sewage, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., and can solve problems such as treatment costs as high as 2.2-2.6 yuan.

Inactive Publication Date: 2012-02-15
HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of adding methanol as a carbon source, white sugar or industrial glucose can only be used as a carbon source in the biochemical sewage treatment process, and the cost per ton of sewage treatment is as high as 2.2-2.6 yuan / ton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Sewage with an ammonia nitrogen concentration of 200-240mg / l and a COD (chemical oxygen demand) concentration of 170-200mg / L is passed through a sediment trap to remove suspended solids and petroleum, and then cooled to 35-40°C by a cooling tower , Enter A1 (first-level anaerobic tank), O1 (first-level aerobic tank), A2 (secondary anaerobic tank), O2 (secondary aerobic tank) pools in turn.

[0016] The A1 pool utilizes the carbon source in the sewage for denitrification. The O1 pool nitrosates the ammonia nitrogen in the sewage. The A2 pool is a carbon source dosing point to further denitrify the sewage to achieve nitrogen and nitrogen standards. The O2 pool is to decompose the excess carbon source existing in the aforementioned process, reduce COD, and achieve COD compliance. The carbon source added to the A2 pool is a mixture of glucose and sodium acetate in a ratio of 1:3, and the total amount added is 0.4 kg per ton of sewage.

[0017] The chemical reactions that...

Embodiment 2

[0023] Sewage with an ammonia nitrogen concentration of 200-240mg / l and a COD (chemical oxygen demand) concentration of 170-200mg / L is passed through a sediment trap to remove suspended solids and petroleum, and then cooled to 35-40°C by a cooling tower , enter A1, O1, A2, O2 pools in turn. Dosing carbon source in the A2 pool, the carbon source is a mixture of glucose and sodium acetate in a ratio of 1:15, and the total amount of dosing is 0.5 kg per ton of sewage.

[0024] Part of the biochemical sludge generated by the system is returned to the biochemical system, and the remaining sludge is discharged to the sludge thickening tank. After initial volume reduction, mechanical dehydration is performed, and the dried sludge is transported outside for treatment.

Embodiment 3

[0026] Sewage with an ammonia nitrogen concentration of 200-240mg / l and a COD (chemical oxygen demand) concentration of 170-200mg / L is passed through a sediment trap to remove suspended solids and petroleum, and then cooled to 35-40°C by a cooling tower , enter A1, O1, A2, O2 pools in turn. Dosing carbon source in the A2 pool, the carbon source is a mixture of glucose and sodium acetate in a ratio of 1:5, and the total amount of dosing is 0.45 kg per ton of sewage.

[0027] Part of the biochemical sludge generated by the system is returned to the biochemical system, and the remaining sludge is discharged to the sludge thickening tank. After initial volume reduction, mechanical dehydration is performed, and the dried sludge is transported outside for treatment.

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Abstract

The invention provides a method for treating sewage generated in the ammonia synthesis process using coal as a raw material. The method comprises the following steps of: settling sewage sediments, introducing the sediments into a first-stage anaerobic tank, a first-stage oxic tank, a second anaerobic tank and a second-stage oxic tank sequentially, and performing two-stage anaerobic / oxic (A / O) biochemical treatment to reduce ammonia nitrogen content and chemical oxygen demand in the sewage, wherein the sewage is subjected to denitrification in the first-stage anaerobic tank and the second-stage anaerobic tank, and is subjected to nitrosation in the first-stage oxic tank and the second-stage oxic tank. The method is characterized by comprising the following step of: putting glucose and sodium acetate in the weight ratio of 1:(3-15) into the second-stage anaerobic tank, wherein 0.4 to 0.5 kilogram of glucose and sodium acetate are put into each ton of sewage according to the total addition amount. The glucose and the sodium acetate are mixed and matched according to a proportion, so that the method has a good treatment effect on the sewage and is lower in cost. Simultaneously, after the glucose and the sodium acetate are added according to the proportion, compared with a method in which white sugar and the glucose are purely added, the method has the advantages that: the total addition amount of a carbon source can be reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and specifically refers to a method for treating sewage in synthetic ammonia using coal as a raw material. Background technique [0002] For ammonia production enterprises using coal as raw material, a large amount of waste water will be discharged during the process of gas production, desulfurization, decarbonization, refining and ammonia synthesis of raw coal. Because coal contains elements such as carbon, hydrogen, oxygen, nitrogen, and sulfur, which are transformed into various organic and inorganic compounds of oxygen, nitrogen, and sulfur during the dry distillation process, the moisture in the gas and the condensate of the steam contain a variety of toxic Harmful pollutants (nitrogen, phenolic compounds, cyanide and sulfide, etc.) are one of the difficult industrial wastewater. How to remove the sewage containing high concentrations of ammonia nitrogen and organic matter has beco...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 蒋远华杨晓勤张道红何原赵翠霞
Owner HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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