Method for treating caprolactam production wastewater

A technology of caprolactam and wastewater production, which is applied in the direction of special treatment targets, natural water treatment, chemical instruments and methods, etc., can solve the problems of shortened effective service life of MBR devices, high content of viscous impurities, increased operating costs, etc., to reduce chemical cleaning The number of times, reduce energy consumption, and improve the effect of equipment maintenance

Inactive Publication Date: 2016-05-04
CHINA TIANCHEN ENG +2
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Problems solved by technology

However, there are still many problems in the process of treating caprolactam wastewater with the existing single membrane treatment technology, such as too much viscous impurities in the wastewater, which will block the membrane filter after long-term operation, shorten the effective service life of the MBR device, and require frequent maintenance and replacement , resulting in a substantial increase in operating costs

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  • Method for treating caprolactam production wastewater

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Embodiment 1

[0038] In the caprolactam production wastewater of a domestic chemical company, the COD of the rearrangement sub-plant wastewater is 11400mg / L, and the total nitrogen (TN) content is 275mg / L.

[0039] Caprolactam waste water enters reactor, adds ammonium sulfate to make its concentration maintain 15wt%, control reactor temperature 50 ℃, pressure-0.08Mpa, stirring rate 800r / min, pure water content keeps on 63wt%, enter sedimentation system after staying 15min, to In the overflow tank, 10g / t of waste water is added to the flocculant for sedimentation and stratification, and the supernatant liquid is returned to the reactor, and the return flow is repeated until the indicators in the system are stable. At this time, the wastewater in the reactor is continuously introduced, the water is continuously evaporated, and the flocs are continuously precipitated. The wastewater containing flocs is continuously introduced into the overflow tank and the sedimentation process continues, and t...

Embodiment 2

[0041] The caprolactam production wastewater of a chemical company in China has a COD of 12100mg / L and a total nitrogen (TN) content of 284mg / L.

[0042] Caprolactam waste water enters reactor, adds ammonium sulfate to make its concentration maintain 21wt%, control reactor temperature 40 ℃, pressure-0.08Mpa, stirring speed 800r / min, pure water content keeps on 75wt%, after staying 15min, enter sedimentation system, to In the overflow tank, 8g / t of waste water is added to the flocculant for sedimentation and stratification, and the supernatant liquid is refluxed to the reactor, and the reflux is repeated until the various indicators in the system are stabilized. At this time, the wastewater in the reactor is continuously introduced, the water is continuously evaporated, and the flocs are continuously precipitated. The wastewater containing flocs is continuously introduced into the overflow tank and the sedimentation process continues, and the supernatant is continuously returned...

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Abstract

The invention provides a method for treating caprolactam production wastewater. The method comprises the following steps of (1) salting-out: adding inorganic salt into a reactor, while continuously leading the caprolactam production wastewater and/or reflux liquid, continuously evaporating moisture, and precipitating organic matters in the wastewater in a floccule form under the salting-out function; (2) flocculating: continuously leading the wastewater containing the floccule into an overflow tank, adding a flocculant into the overflow tank, flocculating and settling suspensions containing the floccule in the wastewater, and enabling the supernatant of the overflow tank to flow back to the reactor; (3) thinning the wastewater subjected to salting-out and flocculating, sending into a membrane biological reactor, and further performing biochemical treatment, wherein the membrane biological reactor comprises an A/O biochemical system, a dynamic membrane filter, a dynamic membrane preparation system and a hydraulic backflushing device. The method has the advantages that the energy consumption is low, the operation cost is low, and a large amount of caprolactam wastewater can be effectively and quickly treated.

Description

technical field [0001] The invention belongs to the field of production wastewater treatment in the chemical industry, and in particular relates to a method for treating caprolactam production wastewater. Background technique [0002] Caprolactam is an important and widely used raw material for chemical production, but its production wastewater is difficult to treat, which has been a prominent problem that has plagued the industry for a long time. Pollutants in caprolactam production wastewater include cyclohexanone, cyclohexane, cyclohexanol, benzene, cyclohexanone oxime, organic acids, caprolactam, ammonia nitrogen, etc., with many types of organic matter, complex components, high toxicity, high content, and COD value High, difficult biodegradation and other characteristics. [0003] Traditional caprolactam wastewater treatment methods mainly include incineration, biochemical and membrane treatment. The usual method of incineration is to increase the content of organic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F9/00C02F1/44C02F1/52C02F1/56C02F3/1268C02F3/30C02F2103/36C02F2303/14
Inventor 师浩淳孙腾李江川段宏悦丁辉李露王辅瑞刘文刚杨克俭刘期敏周明生卞明梁军湘王军吕威鹏赵敏伟郭萌陈云祥
Owner CHINA TIANCHEN ENG
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