Coal gasification sewage treatment method

A coal gasification sewage and treatment method technology, applied in water/sewage treatment, biological water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of complex operation, no utilization, increased mud volume, etc., and achieve simple operation , save operation and cost, reduce the concentration of ammonia nitrogen and COD

Inactive Publication Date: 2020-10-09
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For sewage with high temporary hardness content, lime soda ash method not only does not take advantage of the high concentration of bicarbonate ions in sewage, but also introduces additional calcium ions, which requires secondary dosing of soda ash to remove. The operation is complicated and the amount of mud increases. high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The coal gasification wastewater used in this example has a hardness of 1000-2000 mg / L, a COD of 200-300 mg / L, and an ammonia nitrogen of 200-300 mg / L. The treatment method of coal gasification sewage includes the following steps in sequence:

[0035] a. Pretreatment of coal gasification sewage:

[0036] Pretreatment includes degreasing treatment and coagulation treatment: the coal gasification sewage is degreased through the flat grease trap, and then enters the coagulation sedimentation tank, and the coagulant polyacrylamide and polyaluminum chloride are added to the coagulation tank, The dosage of polyacrylamide is 3-5㎎ / L, and the dosage of polyaluminum chloride is 200-300mg / L. After stirring, coagulation and sedimentation, the upper sewage enters the softening tank;

[0037] b. Double alkali softening treatment:

[0038] Add double-alkali softener to the softening tank. The double-alkali softener includes sodium hydroxide and soda ash, and add a coagulant at the s...

Embodiment 2

[0045] The difference between embodiment 2 and embodiment 1 is:

[0046] In step b, the amount of soda ash added remains unchanged, the amount of sodium hydroxide added is adjusted so that the pH of the sewage is controlled at 7.2-8.0, the total hardness of the dual-alkali softened effluent is 100-180mg / L, and the total hardness drops by more than 90%;

[0047] After short-term nitrification, effluent COD<40mg / L, ammonia nitrogen<5mg / L;

[0048] COD < 100mg / L, ammonia nitrogen < 80mg / L, and nitrite ion < 55mg / L in the effluent after anaerobic ammonium oxidation;

[0049] COD<50mg / L, ammonia nitrogen<8mg / L, and total nitrogen<15mg / L in the effluent after aerobic aeration treatment meet the GB18918-2002 Class A standard.

Embodiment 3

[0051]The difference between embodiment 3 and embodiment 1 is:

[0052] In step b, the amount of soda ash added remains unchanged, and the amount of sodium hydroxide added is adjusted so that the pH of the sewage is controlled at 8.0-8.5, the total hardness of the dual-alkali softened effluent is 100-150mg / L, and the total hardness drops by more than 90%;

[0053] After short-term nitrification, effluent COD<80mg / L, ammonia nitrogen<75mg / L;

[0054] COD < 80mg / L, ammonia nitrogen < 60mg / L, and nitrite ion < 30mg / L in the effluent after anaerobic ammonium oxidation;

[0055] COD<50mg / L, ammonia nitrogen<8mg / L, and total nitrogen<15mg / L in the effluent after aerobic aeration treatment meet the GB18918-2002 Class A standard.

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Abstract

The invention discloses a coal gasification sewage treatment method which sequentially comprises the following steps: coal gasification sewage is pretreated, and the pretreatment comprises oil removaltreatment and coagulation treatment; insoluble substances are removed through double-alkali softening treatment, the double-alkali softening treatment comprises the step of adding a double-alkali softener into the sewage, the double-alkali softener comprises sodium hydroxide and sodium carbonate, the total hardness of the sewage subjected to the double-alkali softening treatment is reduced by 90%or above, and the hardness of the sewage is smaller than 200 mg / L; anaerobic ammonia oxidation treatment is performed; and aerobic aeration treatment is performed. The hardness of the sewage is obviously reduced, the operation is simple and the sludge amount is small.

Description

technical field [0001] The invention relates to the field of sewage treatment, more specifically, it relates to a coal gasification sewage treatment method. Background technique [0002] Hydrogen combustion produces water, which is currently recognized as the cleanest fuel and a very important clean energy. At present, hydrogen production technology is mainly divided into two categories, water splitting hydrogen production and hydrogen production from other primary energy conversion. Hydrogen production by water splitting is mainly the electrolysis of water (salt water) to produce hydrogen, which is costly. Hydrogen production from other primary energy conversion mainly uses fossil energy as raw material and water vapor to produce hydrogen at high temperature. At present, it is mainly coal-to-hydrogen. [0003] Sewage will be produced during the coal hydrogen production process, and the sewage mainly comes from the washing water of the coal gasification unit and the quench...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F9/00C02F5/02C02F1/40C02F1/66C02F1/56C02F1/5236C02F3/307C02F3/303C02F3/30
Inventor 李长刚叶芳芳詹彤张帅谢文玉李德豪刘景峰刘志森王儒珍梁家豪杨振兴李阳王储马志楠
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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