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Sewage treatment method in synthetic rubber production

A sewage treatment method and synthetic rubber technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of synthetic rubber sewage effluent not meeting discharge standards, high investment cost, Problems such as the complete oxidation treatment of rubber sewage cannot be applied to achieve the effects of pollutant emission reduction, safe and reliable operation, and great practical significance

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not meet the discharge standard of 60mg / L for the treatment of synthetic rubber sewage, and the investment cost is high
[0005] The literature "Research on the Treatment of Rubber Wastewater by Chlorine Dioxide Catalytic Oxidation" reported that when chlorine dioxide is used for chemical oxidation treatment, under the action of an appropriate catalyst, the reaction speed is faster, and the biodegradability of rubber wastewater can be significantly improved (B / C value) to about 0.5, thus laying a good foundation for the subsequent biological treatment, but the cost of oxidant consumed per ton of sewage is between 5.20 and 6.93 yuan. At present, this method cannot be applied to the thorough oxidation treatment of rubber sewage

Method used

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  • Sewage treatment method in synthetic rubber production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A synthetic rubber production sewage (COD is 922.3mg / L, flow rate is 150 m 3 / h) enter figure 1 In the process flow shown, the main process parameters of each treatment unit are: the pretreatment unit adds NaOH to adjust the pH value to 8.5, the addition amount of PAC and PMA is 200mg / L and 4mg / L respectively, and the air flotation residence time is 0.5h. The effluent COD of this unit is 719mg / L, and the COD removal rate is 22%.

[0030] Sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD drops to 371.3mg / L, and the COD removal reaches 48%.

[0031]The sewage then enters the hydrolytic acidification tank with a hydraulic retention time of 8 hours, dissolved oxygen DO: 0.3 mg / L, and sludge concentration MLSS: 8000 mg / L. The B / C of this unit is increased from 0.3 to 0.5, the effluent COD concentration is 295mg / L, and the COD removal rate is 21%.

[0032] The sewage...

Embodiment 2

[0035] A synthetic rubber production sewage (COD is 1069mg / L, flow rate is 200 m 3 / h) enter figure 1 In the process flow shown, the main process parameters of each treatment unit are: the pretreatment unit adds NaOH to adjust the pH value to 8.9, the addition amount of PAC and PMA is 300mg / L and 5mg / L respectively, and the air flotation residence time is 1h. The effluent COD of this unit is 965mg / L, and the COD removal rate is 21%.

[0036] The sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD drops to 495mg / L, and the COD removal reaches 43%.

[0037] The sewage then enters the hydrolysis acidification tank with a hydraulic retention time of 13h, dissolved oxygen DO: 0.2 mg / L, and sludge concentration MLSS: 9000mg / L. The B / C of this unit is increased from 0.4 to 0.6, the effluent COD concentration is 309mg / L, and the COD removal rate is 21%.

[0038] The sewage afte...

Embodiment 3

[0041] A synthetic rubber production sewage (COD is 761.2mg / L, flow rate is 120 m 3 / h) enter figure 1 In the process flow shown, the main process parameters of each treatment unit are: the pretreatment unit adds NaOH to adjust the pH value to 7.5, the addition amount of PAC and PMA is 200mg / L and 3mg / L respectively, and the air flotation residence time is 0.5h. The effluent COD of this unit is 601mg / L, and the COD removal rate is 21%.

[0042] Sewage enters the sludge adsorption tank to remove the remaining suspended solids and colloidal particles in the pretreatment unit. After adsorption, the COD drops to 312mg / L, and the COD removal reaches 48%.

[0043] The sewage then enters the hydrolytic acidification tank with a hydraulic retention time of 10.0h, dissolved oxygen DO0: 0.15 mg / L, and sludge concentration MLSS: 7000mg / L. The B / C of this unit is increased from 0.3 to 0.5, the effluent COD concentration is 234mg / L, and the COD removal rate is 25%.

[0044] The sewage a...

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Abstract

The invention relates to a sewage treatment method in synthetic rubber production and belongs to the technical field of industrial sewage treatment. The method comprises steps in the following order: sewage pretreatment, sludge adsorption, hydrolytic acidification, aerobic biochemical treatment and advanced oxidation treatment, inclusive of domestic sewage and synthetic rubber production sewage blended treatment. By the adoption of the method, biodegradation rate and degradation effect are effectively raised. Iron-carbon microelectrolysis technology is adopted in the advanced oxidation stage, thus greatly reducing treatment cost and effectively removing pollutants of COD, NH3-N the like in the synthetic rubber production sewage. COD of an effluent obtained after the treatment is less than or equal to 60mg / L, and NH3-N is less than or equal to 5mg / L. therefore, the method achieves the standard of discharge and is of great realistic significance. In addition, the treatment cost of the sewage per ton can be reduced to 0.5 yuan. The economic benefit is great.

Description

technical field [0001] The invention relates to a sewage treatment method in the production of synthetic rubber, belonging to the technical field of industrial sewage treatment. Background technique [0002] Synthetic rubber has a wide range of uses as one of the three major synthetic materials, but the sewage generated during its production is difficult to treat. Especially the styrene-butadiene rubber production sewage contains a relatively high concentration of organic matter, most of which are uncondensed low-molecular polymers, and also contains a large amount of organic matter and additives that are difficult to biodegrade, such as benzene series, emulsifiers, initiators, diffusion Agents, terminators, coagulants, etc., the water quality is complex, and the biodegradability is poor. At present, the treatment methods of synthetic rubber production sewage mainly include: coagulation sedimentation method, coagulation air flotation method, electrochemical method, biologic...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/14
Inventor 邹宗海潘咸峰黄斌王建娜刘婷婷
Owner CHINA PETROLEUM & CHEM CORP
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