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Method for treating coking wastewater

A technology of coking wastewater and treatment methods, which is applied in the direction of oxidation water/sewage treatment, chemical instruments and methods, flotation water/sewage treatment, etc. It can solve the problems of poor removal of organic matter and difficulty in reaching the secondary discharge standard, etc., and achieve reduction Biological oxygen demand, improving the effect of hydrolysis and acidification, and promoting the effect of electrochemical corrosion

Inactive Publication Date: 2010-07-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the activated sludge treatment of coking wastewater has a poor effect on organic matter removal and it is difficult to meet the secondary discharge standard of the "Comprehensive Wastewater Discharge Standard" (GB8978-96). Wastewater treatment method

Method used

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  • Method for treating coking wastewater
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specific Embodiment approach 1

[0012] Specific embodiment one: the processing method of coking wastewater in the present embodiment is as follows: one, Put the coking wastewater into the grease trap for precipitation for 1 to 4 hours; 2. The effluent treated in step 1 enters the regulating tank to adjust the pH value to 4 to 5; 3. The effluent treated in step 2 enters the tank equipped with iron filings and activated carbon In the iron-carbon-Fenton oxidation pool of the mixture, then add hydrogen peroxide until the concentration of hydrogen peroxide is 0.10L / m 3 ~0.50L / m 3 , adjust the pH value to 4-5, and the hydraulic retention time is 2.0h-3.5h; 4. After the effluent treated in step 3 enters the air flotation tank, the hydraulic retention time is 1h-4h; 5. Remove the scum produced in the air flotation tank Introduced into the sludge treatment section, the effluent from the air flotation tank enters the upflow anaerobic sludge bed reactor, and the anaerobic sludge concentration in the reactor is 15kg / m ...

specific Embodiment approach 2

[0015] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the concentration of hydrogen peroxide after adding hydrogen peroxide in step three is 0.20L / m 3 ~0.40L / m 3 . Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the concentration of hydrogen peroxide after adding hydrogen peroxide in step three is 0.30L / m 3 . Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for treating coking wastewater, which relates to the method for treating wastewater and aims to solve the problems that an activated sludge method for treating the coking wastewater has the disadvantage of relatively poorer effect on the removal of organic substances and the treated water is difficult to reach the secondary discharge standard of the Integrated Wastewater Discharge Standard (GB8978-96). The method comprises that: the coking wastewater is discharged after passing through an oil separation tank, an adjusting tank, an iron carbon-Fenton oxidation pond, an up-flow anaerobic sludge bed reactor, a multifunctional hydrolyzing pond, an anaerobic tank, a composite active sludge tank and a secondary sedimentation tank, wherein the coking wastewater can also pass through a floatation tank. The coking wastewater treated by the method of the invention has a pH value of 5 to 8 and the rate of removal of Cu2+ from the coking wastewater of 69 to 85 percent, contains 300 to 450mg / L phenol and less than 15mg / L cyanide and therefore reaches the secondary discharge standard of the Integrated Wastewater Discharge Standard (GB8978-96).

Description

technical field [0001] The invention relates to a method for treating waste water, which belongs to the field of sewage treatment. Background technique [0002] Coking wastewater is produced in the process of high-temperature dry distillation of raw coal, gas purification and refining of chemical products. The usual water quality indicators of coking wastewater are as follows: COD5500~7000mg / L, BOD 5 700~1200mg / L, volatile phenol 850~1000mg / L; cyanide 40~60mg / L; ammonia nitrogen 350~550mg / L; oil 100~200mg / L; suspended solids (SS) 100~200mg / L. "Comprehensive Sewage Discharge Standard" (GB8978-96) Requirements for new reconstruction and expansion projects of coking wastewater: NH 3 -N≤15mg / L, COD≤100mg / L. Removal of NH in coking wastewater at home and abroad 3 -N and COD mainly use biochemical methods, among which activated sludge method is the main method, which can effectively remove phenols and cyanides in coking wastewater, but for refractory organic matter and NH 3 T...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F1/66C02F1/72C02F1/24
Inventor 邱珊徐善文马放魏利黄金韩帅杨基先
Owner HARBIN INST OF TECH
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