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Wastewater pretreatment method

A technology of pretreatment and wastewater, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of impossible biochemical treatment, and achieve improved biodegradability and COD reduction Effect

Active Publication Date: 2011-07-13
CHINA PETROCHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of toxic substances in the BIPB reduction wastewater, it is impossible to carry out biochemical treatment

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0051] Use sulfuric acid to adjust the pH of 1,000 grams of reduced wastewater with a COD of 68,900 mg / L to 6.2, then add 20 grams of sulfuric acid, raise the temperature to 100°C, and react for 4 hours. The gas generated by the reaction is absorbed with lye. After the reaction, the waste water was cooled to room temperature, the solid in the waste water was filtered off, and the oil layer was skimmed off. The COD of the water layer was 21400mg / L. The water layer enters the Fenton reactor, and 0.2 g of FeSO is added 4 , 4 grams of 27% H 2 o 2 Stir and react at 50°C for 4 hours. The COD of the effluent is 12900mg / L, the COD removal rate is above 80%, the B / C is greater than 0.3, and the COD of the effluent can be below 100mg / L after biochemical treatment.

Embodiment 2

[0053] Use hydrochloric acid to adjust the pH of 1,000 grams of reduced wastewater with a COD of 68,900 mg / L to 5.3, then add 10 grams of concentrated hydrochloric acid, raise the temperature to 95°C, and react for 4 hours. The gas generated by the reaction is absorbed with lye. After the reaction finished, the waste water was cooled to room temperature, the solid in the waste water was filtered, and the oil layer was skimmed off, and the COD of the water layer was 22700mg / L. The water layer enters the Fenton reactor, and 0.2 g of FeSO is added 4 , 4 grams of 27% H 2 o 2 Stir and react at 50°C for 4 hours. The effluent COD is 12100mg / L, the COD removal rate is above 80%, and the B / C is greater than 0.3.

Embodiment 3

[0055] Use nitric acid to adjust the pH of 1,000 grams of reduced wastewater with a COD of 68,900 mg / L to 6.5, then add 15 grams of nitric acid, raise the temperature to 98°C, and react for 4 hours. The gas generated by the reaction is absorbed with lye. After the reaction, the waste water was cooled to room temperature, the solid in the waste water was filtered off, and the oil layer was skimmed off. The COD of the water layer was 23100mg / L. The water layer enters the Fenton reactor, and 0.2 g of FeSO is added 4 , 4 grams of 27% H 2 o 2 Stir and react at 50°C for 4 hours. The effluent COD is 12500mg / L, the COD removal rate is above 80%, and the B / C is greater than 0.3.

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Abstract

The invention provides a BIPB wastewater pretreatment method which combines the technologies of acid decomposition and oxidation of Fenton reagent to treat BIPB wastewater (especially BIPB reduction wastewater), thus achieving excellent effect, reducing COD greatly and enhancing biodegradability dramatically. The pretreated (primary treatment) BIPB reduction wastewater can be directly subject to secondary biochemical treatment after being neutralized. The method is economical and practical and is suitable for industry-scale waste treatment.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to the pretreatment of BIPB waste water. Background technique [0002] Bis-(tert-butylperoxyisopropyl)benzene (BIPB for short) is widely used as a plastic crosslinking agent and a vulcanizing agent in rubber. The biggest feature of BIPB is that it does not produce odor during the cross-linking process, so it is called "odorless DCP". BIPB is currently selling well in domestic and foreign markets, and has good economic benefits. After continuous technological transformation, the output of BIPB of Sinopec Gaoqiao Branch can reach 400 tons per year. However, producing one ton of BIPB produces a considerable amount of process wastewater. [0003] With the development of society, people's awareness of environmental protection is getting stronger and stronger, the country and Shanghai have higher and higher requirements for environmental protection, and the control of wastewater dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/72
Inventor 吴成跃徐裕谭永生潘新民陈志坚丁红卫
Owner CHINA PETROCHEMICAL CORP
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