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Method for treating coking wastewater by using industrial pulverized coke instead of active carbon

A technology of coking wastewater and activated carbon, which is applied in the direction of adsorption water/sewage treatment, etc., can solve the problems of no harmless degradation, high cost, large consumption of chemicals, etc., and achieves significant wastewater treatment effect, low maintenance cost, no two The effect of secondary pollution

Active Publication Date: 2009-05-27
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • Application Information

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Problems solved by technology

However, the flocculation-sedimentation treatment facilities occupy a large area, consume a large amount of chemicals, and have high costs, and the pollutants are only transferred from the water to the sludge without complete harmless degradation, which causes sludge treatment problems; the activated carbon adsorption method Although the effect is remarkable, due to the high price of activated carbon, the one-time investment of the device is large, and the operation and operation costs are relatively high; although other new treatment technologies such as wet catalytic oxidation technology and ultrasonic radiation method can completely degrade the organic matter in coking wastewater, but High requirements on equipment, complicated operation and high energy consumption, it is difficult to popularize in industrial practical applications

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  • Method for treating coking wastewater by using industrial pulverized coke instead of active carbon

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Specific implementation mode 1 - static batch processing:

[0013] Take 3000mL of secondary coking waste water after coking biological dephenolization, acidify with 5%-10%wt sulfuric acid or industrial waste sulfuric acid, adjust its pH value to 2.0, and add 300g of coke powder tank with a particle size of 10-80 mesh , after stirring for 2 hours, let stand for 1.5-2.0 hours, draw out the supernatant after the precipitation is completed, and obtain qualified effluent that meets the national first-level discharge standard (GB8978-96) or industrial reuse water quality indicators.

[0014] Put the above-mentioned wet industrial coke powder adsorbed with waste water pollutants in a muffle furnace or tube furnace under the protection of vacuum or nitrogen atmosphere, under continuous vacuum (vacuum degree is 720-750mmHg) or flowing nitrogen (20-40L N 2 / h·kg wet coke powder) environment, the temperature is raised to 300-450°C under oxygen barrier, heated for 4-8 hours, and th...

specific Embodiment approach 2—

[0016] Embodiment 2——continuous dynamic processing:

[0017] As shown in the accompanying drawing, in the wastewater pool (1) is secondary coking wastewater after coking biological dephenolization, which is continuously acidified by using 5% to 10% dilute sulfuric acid or industrial waste sulfuric acid to adjust the pH of the wastewater to 3.0, and pump ( 2) After being lifted and pressurized and measured by the flow meter (3), it is sent to the bottom of the industrial coke powder adsorption tower (4) for adsorption treatment. The apparent residence time of the wastewater in the adsorption tower is 4 to 6 hours. The waste water is collected from the upper part of the adsorption tower and flows into the clear water pool (5). Wherein the flow after flow meter (3) metering is 500L / h, and the fresh coke powder about 1000Kg that comes by coking plant is housed in the industrial coke powder adsorption tower (4).

[0018] Adsorbed saturated wet industrial coke powder is regenerated...

specific Embodiment approach 3—

[0019] Specific embodiment 3——continuous dynamic processing:

[0020] This embodiment is basically the same as the second embodiment. The difference is: in the process, polyferric sulfate (PFS) or polyaluminum chloride (PAC) or polyaluminum sulfate (PAS) or their compound formula is used instead of sulfuric acid or industrial waste sulfuric acid for continuous acidification of wastewater, and the use of polymer agents The addition amount is 0.15%-0.30‰wt of the total waste water. Other steps are the same as the description of the second embodiment.

[0021] The particle size range of the coke powder used in the present invention is 10-80 mesh.

[0022] The amount of industrial coke powder in the three specific embodiments can be increased or decreased according to the specific conditions of the influent water quality.

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Abstract

The invention relates to a method for treating carbonization wastewater through industrial fine coke instead of activated carbon. The method comprises the following three steps: (A) carrying out the acidizing of the carbonization wastewater; (B) carrying out the absorption treatment of the wastewater in an absorption tower through the industrial fine coke; and (C) carrying out the regeneration and reclamation of the absorption saturated wet industrial fine coke through oxygen insulated high temperature heating or directly using the wet industrial fine coke to replace common fine coke and be doped into iron making sintering raw material without regeneration. Therein, during the step A, sulfuric acid or industrial waste sulfuric acid is used to regulate the pH value of the wastewater to 2.0 to 3.0; during the step B, fresh fine coke which is directly produced by a coke plant and has the grain size of 10 to 80 meshes is arranged in the industrial fine coke absorption tower or absorption trough; and during the step C, the absorption saturated wet industrial fine coke is regenerated and reclaimed through oxygen insulated high temperature heating at 300 to 450 DEG C or directly replaces common fine coke to be doped into iron making sintering raw material without regeneration. After the treatment, the removal rates of the chromaticity and COD value in the outputted water reach 65 percent and 85 percent respectively, thereby reaching the first level emission standard in Integrated Wastewater Discharge Standard (GB8978-96).

Description

field of invention [0001] The invention belongs to the field of industrial water treatment, in particular to a method for advanced treatment of coking wastewater by using industrial coke powder instead of activated carbon. Background technique [0002] Coking wastewater is high-concentration organic wastewater produced in the process of coal coke, gas purification and coking product recovery. Due to the influence of various factors such as the nature of raw coal, coking temperature, coking product recovery process, etc., its composition is very complex, containing a large amount of organic pollutants such as phenols, biphenyls, pyridine, indole and quinoline, as well as cyanide, inorganic Toxic and harmful substances such as fluoride ions and ammonia nitrogen, the pollutants have high chromaticity, and it is a kind of organic industrial wastewater that is difficult to treat. Therefore, the treatment of coking wastewater has always been a major problem in the field of wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28
Inventor 刘宪杨运泉沈毅李娅何鑫刘文英刘燕飞
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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