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A method and device for treating caprolactam wastewater by using membrane technology

A technology of caprolactam and membrane technology, applied in the field of chemical production wastewater treatment, can solve the problems of difficult treatment, difficult biochemical treatment of wastewater, difficult recycling of wastewater components, etc., and achieve the effect of improving treatment efficiency and retention rate

Active Publication Date: 2016-04-27
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an integrated treatment and utilization method of caprolactam wastewater, which solves the problems that wastewater is difficult to be treated biochemically, the treatment is difficult, and the components of wastewater are difficult to recycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The caprolactam waste water (pH about 11) is filtered with a nanofiltration membrane. The material of the nanofiltration membrane is polyimide, the molecular weight cut-off is 400Da, the operating pressure is 1.5MPa, and the temperature is 35°C. 900mg / L is reduced to 815mg / L, ammonia nitrogen removal rate is 9%; COD is reduced from 5350mg / L to 860mg / L, COD removal rate reaches 83.9%, which can greatly reduce the operating load of the biochemical system.

[0026] The nanofiltration membrane effluent is treated with an aerobic-anaerobic-aerobic biochemical system. The aerobic biochemical tank operates under the following conditions: inlet water temperature 30-32 °C, dissolved oxygen at the end of the contact oxidation tank 2.5 mg / L, sludge concentration 3000 mg / L, sludge sedimentation ratio 30%, mixed liquid reflux 150%, reaction retention The time is 10 hours; the anaerobic biochemical pool operates under the following conditions: inlet water temperature 30-32 ℃, dissolv...

Embodiment 2

[0028] Adjust the pH of caprolactam wastewater (pH about 11) from about 6 to about 6 with sulfuric acid, and filter it with a nanofiltration membrane. The material of the nanofiltration membrane is polyimide, the molecular weight cut-off is 400Da, the operating pressure is 1.5MPa, and the temperature is 35°C. After nanofiltration membrane treatment, the ammonia nitrogen is reduced from 900mg / L to 117mg / L, and the ammonia nitrogen removal rate is 87%; the COD is reduced from 5350mg / L to 460mg / L, and the COD removal rate reaches 91.4%, which can greatly reduce the operation of the biochemical system load. The concentrated solution of the nanofiltration membrane is further concentrated with a DTNF membrane, and then dried to obtain ammonium sulfate with a purity of about 75%.

[0029] The nanofiltration membrane effluent is treated with an aerobic-anaerobic-aerobic biochemical system. The aerobic biochemical tank operates under the following conditions: inlet water temperature 3...

Embodiment 3

[0032] Adjust the pH of caprolactam wastewater (pH about 11) from about 4 to about 4 with sulfuric acid, and filter it with a nanofiltration membrane. The material of the nanofiltration membrane is polyimide, the molecular weight cut-off is 400Da, the operating pressure is 1.5MPa, and the temperature is 35°C. After nanofiltration membrane treatment, the ammonia nitrogen is reduced from 900mg / L to 103mg / L, and the ammonia nitrogen removal rate is 88.6%; the COD is reduced from 5350mg / L to 440mg / L, and the COD removal rate reaches 91.8%, which can greatly reduce the operation of the biochemical system load. The concentrated solution of the nanofiltration membrane is further concentrated with a DTNF membrane, and then dried to obtain ammonium sulfate with a purity of about 71%.

[0033] The nanofiltration membrane effluent is treated with an aerobic-anaerobic-aerobic biochemical system. The aerobic biochemical tank operates under the following conditions: inlet water temperature...

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Abstract

The invention discloses a method for treating caprolactam wastewater by utilizing membrane technology. The method adopted in the present invention is first to adjust the pH of the caprolactam wastewater to between 6-7 with sulfuric acid, and convert the free ammonia in the wastewater into the form of ammonium sulfate; then use nanofiltration membrane to intercept the ammonia nitrogen and COD in the wastewater, The concentrate and the permeate of the nanofiltration membrane are obtained respectively. The permeated liquid of the nanofiltration membrane directly enters the aerobic-anaerobic-aerobic biochemical system for treatment, and the effluent can meet the first-level standard of the "Comprehensive Wastewater Discharge Standard". The concentrated solution of the nanofiltration membrane enters the DTRO membrane for concentration, recovers a large amount of ammonium sulfate in the concentrated solution, and finally obtains ammonium sulfate fertilizer. Therefore, the present invention can not only make the final effluent meet the discharge standard stipulated by the state, but also can recover a large amount of ammonium fertilizer, which has both environmental and economic benefits.

Description

technical field [0001] The invention relates to a method for treating caprolactam wastewater by using membrane technology, and belongs to the technical field of wastewater treatment in chemical industry. Background technique [0002] Caprolactam is an important organic chemical raw material. Its main purpose is to produce polyamide chips through polymerization, which can be further processed into nylon fibers, engineering plastics, and plastic films. Caprolactam is generally produced using benzene as a raw material. The composition of the wastewater produced by this process is very complex. The main pollutants are cyclohexanone, cyclohexane, benzene and other organic substances and ammonia nitrogen. It has the characteristics of high COD and high ammonia nitrogen water quality. It is a difficult Treated petrochemical wastewater. [0003] At present, domestic caprolactam wastewater treatment methods mainly include biochemical methods, high-temperature incineration methods, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C01C1/24C02F103/36
Inventor 叶圣武彭文博吴正雷寇琴赵艳张宏
Owner JIANGSU JIUWU HITECH
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