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Method for treating wastewater of caprolactam production

A treatment method, caprolactam technology, applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor treatment effect of COD and TN, improve pretreatment effect, promote Biodegradability, effects of reduced handling requirements

Active Publication Date: 2013-02-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome problems such as poor COD and TN treatment effects existing in the prior art, the present invention adopts the combined process of oxidant pretreatment-iron-copper micro-electrolysis pretreatment-membrane bioreactor (MBR) to improve the effect and efficiency of caprolactam production wastewater treatment reliability

Method used

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Examples

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Effect test

Embodiment 1

[0027] In the caprolactam production wastewater of a petrochemical enterprise, the COD of the wastewater from the cyclohexanone ammonia oxime chemical section is 4500mg / L, and the ammonia nitrogen is 195mg / L.

[0028] (1) First, add hydrogen peroxide to the waste water of the ammonia oximation process to a concentration of 100 mg / L, and oxidize it for 20 minutes; 3 Aeration and micro-electrolysis treatment; the mass ratio of iron and copper in the iron-copper alloy is 96:4, the size of the filler is 15mm×15mm×5mm, the filling rate of the filler is 30%, and the aeration time is 2h; the COD value after treatment 2800mg / L, ammonia nitrogen content is 165mg / L;

[0029] (2) Mix the waste water from the ammonia oximation process after the micro-electrolysis treatment with the waste water from other sections of the caprolactam production process, and then enter the MBR biochemical reaction treatment. The COD value of the mixed wastewater is 2000mg / L, and the total nitrogen (TN) conten...

Embodiment 2

[0033] The caprolactam production wastewater of a petrochemical enterprise, the COD of the wastewater in the cyclohexanone ammonia oxime chemical section is 4200mg / L, and the ammonia nitrogen is 155mg / L;

[0034] (1) Firstly, sodium hypochlorite is added to the waste water of the ammonia oximation process to a concentration of 100 mg / L, and oxidized for 30 minutes; 3 , carry out micro-electrolysis treatment; The mass ratio of iron and copper in the iron-copper alloy is 96: 4, and the packing size is 15mm * 15mm * 5mm, and the filling rate of filler is 33%, O 3 The aeration time is 1.5h; then add an appropriate amount of flocculant aluminum chloride, the flocculation reaction time is 30min, the COD value of the flocculation sedimentation supernatant is 2500mg / L, and the ammonia nitrogen content is 135mg / L;

[0035] (2) Mix the flocculation and sedimentation supernatant with wastewater from other sections of the caprolactam production process. After mixing, the COD value of the ...

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Abstract

The invention relates to a method for treating wastewater of caprolactam production. The method of the invention employs a technology combining oxidizing agent pretreatment, iron-copper micro-electrolysis pretreatment and a membrane bioreactor (MBR). The method first conducts pretreatment to remove part of COD (chemical oxygen demand) and biological toxic substances from ammoximation wastewater, and then mixes the treated ammoximation wastewater with the rest wastewater of caprolactam production for MBR biochemical treatment. A biochemical treatment unit in the MBR system adopts a granular biomembrane filling material. In a membrane separation unit, a pulsed gas-containing water flow drives the granular biomembrane filling material to clean membrane components continuously. The method of the invention not only improves the treating effect to wastewater of caprolactam production, but also enhances the operation effect and system stability of the membrane separation system, and reduces treatment cost.

Description

technical field [0001] The invention relates to a method for treating waste water with high ammonia nitrogen, more specifically, relates to a method for treating waste water produced by caprolactam. Background technique [0002] Caprolactam is a monomer for synthesizing nylon-6 fibers and nylon-6 engineering plastics, and is widely used in polymer materials. Difficult treatment of caprolactam production wastewater is a prominent problem that plagues the production of the industry. At present, the high-concentration organic wastewater discharged from domestic caprolactam production units has a chemical oxygen demand (COD) as high as 130g / L, and its composition is very complex. Even in the recovery of wastewater After adding caprolactam in the water, the COD value of the effluent is still high, and it is difficult to meet the national discharge standard by using the traditional wastewater treatment process. Cyclohexanone oxime is a key intermediate in the production of caprol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 刘恒齐红卫修锐董欣杨宁季迎江柳
Owner CHINA PETROLEUM & CHEM CORP
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