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Method and device for treating caprolactam-containing waste water

A caprolactam and treatment method technology, which is applied in the field of caprolactam-containing wastewater treatment method and its treatment device, can solve the problems of lower denitrification efficiency, long sludge age, and difficulty in reaching the standard of effluent water quality, and achieve high denitrification efficiency and easy treatment effect of effect

Active Publication Date: 2012-02-15
浙江华建尼龙有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process, there are still some low-concentration caprolactam wastewater discharges that cannot be collected and utilized, mainly including the overflow water of each sealed tank, the cleaning and drainage of various filters and other equipment, and the drainage of laboratory chemical analysis, etc.
Caprolactam wastewater, namely C6H11NO wastewater, is one of the most difficult wastewater in the chemical industry. Difficult to meet the standard. At present, most domestic enterprises use A / O process to treat caprolactam wastewater, that is, anoxic-aerobic system
In the conventional biological denitrification process, in order to maintain a sufficient number of nitrifying bacteria in the structure to complete the biological nitrification, the volume of the structure is correspondingly increased while maintaining a longer sludge age; in addition, the poor flocculation Nitrifying bacteria are often carried out by the effluent of the secondary sedimentation tank, and the reduction of the number of nitrifying bacteria affects nitrification, thereby reducing the nitrogen removal efficiency of the system

Method used

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  • Method and device for treating caprolactam-containing waste water
  • Method and device for treating caprolactam-containing waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Put the production wastewater to be treated into the regulating tank, and set up a pre-aeration device in the regulating tank. The pre-aerating device is a perforated aeration tube. Pre-aeration treatment is carried out in the regulating tank, and the dissolved oxygen in the controlling tank is less than 0.5mg / L. The production wastewater after pre-aeration is pumped into the coagulation sedimentation tank, and the coagulant ferrous sulfate is added to the coagulation sedimentation tank for coagulation and sedimentation. The production wastewater is stratified after coagulation and sedimentation, and the upper layer is the supernatant. The lower layer is sludge, and the sludge is sent to the sludge tank;

[0029] (2) The supernatant produced by coagulation and sedimentation overflows into the anoxic tank, and YDTZ elastic combined packing is installed in the anoxic tank, and the volume of YDTZ elastic combined packing accounts for 70% of the anoxic tank. Attached ...

Embodiment 2

[0036] (1) Put the production wastewater to be treated into the regulating tank, and set up a pre-aeration device in the regulating tank. The pre-aerating device is a perforated aeration tube. Pre-aeration treatment is carried out in the regulating tank, and the dissolved oxygen in the controlling tank is less than 0.5mg / L. The production wastewater after pre-aeration is pumped into the coagulation sedimentation tank, and the coagulant polyaluminium chloride is added to the coagulation sedimentation tank for coagulation and sedimentation. The production wastewater is stratified after coagulation and sedimentation, and the upper layer is the supernatant , the lower layer is sludge, and the sludge is sent to the sludge pool;

[0037] (2) The supernatant produced by coagulation and sedimentation overflows into the anoxic tank, and YDTZ elastic combined packing is installed in the anoxic tank, and the volume of YDTZ elastic combined packing accounts for 70% of the anoxic tank. A...

Embodiment 3

[0044] (1) Put the production wastewater to be treated into the regulating tank, and set up a pre-aeration device in the regulating tank. The pre-aerating device is a perforated aeration tube. Pre-aeration treatment is carried out in the regulating tank, and the dissolved oxygen in the controlling tank is less than 0.5mg / L. The production wastewater after pre-aeration is pumped into the coagulation sedimentation tank, and the coagulant ferrous sulfate is added to the coagulation sedimentation tank for coagulation and sedimentation. The production wastewater is stratified after coagulation and sedimentation, and the upper layer is the supernatant. The lower layer is sludge, and the sludge is sent to the sludge tank;

[0045] (2) The supernatant produced by coagulation and sedimentation overflows into the anoxic tank, and YDTZ elastic combined packing is installed in the anoxic tank, and the volume of YDTZ elastic combined packing accounts for 70% of the anoxic tank. Attached ...

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Abstract

The invention discloses a method for treating caprolactam-containing waste water. The method comprises the following steps of 1, putting production waste water needing to be treated into an adjustment tank to carry out preaeration treatment, and feeding the treated production waste water into a coagulation sedimentation basin to carry out coagulation sedimentation, 2, carrying out anaerobic degradation, 3, carrying out aerobic degradation, 4, carrying out secondary coagulation sedimentation to obtain settled sludge, feeding the settled sludge back to an anoxic tank to carry out microbe amount supplement, feeding residual sludge back to a sludge tank, disinfecting water treated in a secondary coagulation sedimentation tank, and discharging directly the disinfected water to the environment, and 5, carrying out press filtration of sludge in the sludge tank by a plate and frame filter press, and feeding the filtrate to the adjustment tank. The invention also discloses a device adopting the method. Compared with the traditional technology, the method for treating caprolactam-containing waste water has high nitrogen removal efficiency and good treatment effects. The device for treating caprolactam-containing waste water has the advantages of simple structure and good waste water treatment effects.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method and a treatment device for wastewater containing caprolactam. Background technique [0002] In the production process of some polyamides, production wastewater will be generated. These production wastewaters need to be cleaned before they can be discharged. In production, the generation and discharge of high-concentration wastewater can be greatly reduced. At present, the discharge of production wastewater has basically achieved zero discharge. However, in the production process, there are still some low-concentration caprolactam wastewater discharges that cannot be collected and utilized, mainly including overflow water from sealed tanks, cleaning and drainage of equipment such as filters, and drainage from laboratory chemical analysis. Caprolactam Wastewater i.e. C 6 h 11 NO wastewater is one of the difficult-to-treat wastewater in the chemical industry. Alt...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F3/34C02F103/36
Inventor 李晓光
Owner 浙江华建尼龙有限公司
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