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Method for treating wastewater generated by cyclohexanone ammoximation process

A cyclohexanone ammonia oxime and wastewater treatment technology, which is applied in biological water/sewage treatment, oxidized water/sewage treatment, natural water treatment, etc., can solve the problem of affecting the treatment effect of sewage treatment, the decline of biochemical treatment performance, and the increase of organic matter content, etc. problems, to achieve the effect of low cost of treatment, strong ability to cause secondary pollution, and water quality impact

Active Publication Date: 2010-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, there are no relevant research reports at home and abroad on the caprolactam wastewater produced by the ammonia oximation process.
At the same time, there are few domestic and foreign reports on the treatment of waste water from the unit process of preparing cyclohexanone oxime. In actual production, this part of waste water is often mixed with waste water from other workshops and treated uniformly, resulting in a significant increase in the content of organic matter in the water. Biochemical The treatment performance decreases, which increases the difficulty of treatment and seriously affects the treatment effect of the entire sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using hydrogen peroxide + Fe 2+ +SBR treatment of ammonia oximation process wastewater. The operating conditions are determined as follows: the influent pH value is 4, the catalyst Fe 2+ The dosage is 10mol / L, H 2 o 2 The dosage is 450mg / L, the residence time of the wastewater in the reactor is 20 minutes, the pH value of the water entering the flocculation tank is adjusted to 7, the residence time of the wastewater in the flocculation tank is 2 hours, and the wastewater enters the SBR system after flocculation and settlement. The specific composition of the SBR system is three volumes of 100m 3 For the biochemical pool, the process conditions are 0.5 hours of water intake, 3.5 hours of aeration, 1 hour of sedimentation, 1 hour of drainage, and 2 hours of idle time. The water quality indicators of wastewater before and after treatment are shown in Table 1.

[0029] It can be seen from the data in Table 1 that the COD and ammonia nitrogen content of the wastewater a...

Embodiment 2

[0033] Ozone + SBR was used to treat wastewater from ammonia oximation process. The operating conditions are determined as follows: the pH value of the influent water is 5, the dosage of ozone is 200mg / L, the residence time of the wastewater in the reactor is 10 minutes, the wastewater enters the SBR system after the reaction, the pH value of the influent water is controlled to 7, and the specific composition of the SBR system 150m for 2 volumes 3 For the biochemical pool, the process conditions are 0.25 hours of water intake, 3 hours of aeration, 0.5 hours of sedimentation, 0.75 hours of drainage, and 1.5 hours of idle time. The water quality indicators of the wastewater before and after the reaction are shown in Table 2.

[0034] It can be seen from the data in Table 2 that the COD and ammonia nitrogen content of the wastewater are greatly reduced after treatment, and the COD and ammonia nitrogen indicators in the wastewater meet the discharge requirements.

[0035] Table ...

Embodiment 3

[0038] Using chlorine dioxide + Fe 2+ +SBR treatment of ammonia oximation process wastewater. The operating conditions are determined as follows: the influent pH value is 3, the catalyst Fe 2+ The dosage is 15mol / L, ClO 2The dosage is 400mg / L, the residence time of the wastewater in the reactor is 30 minutes, the pH value of the water entering the flocculation tank is adjusted to 6.5, the residence time of the wastewater in the flocculation tank is 2 hours, and the wastewater enters the SBR system after flocculation and settlement. The specific composition of the SBR system is three volumes of 100m 3 For the biochemical pool, the process conditions are 0.5 hours of water inflow, 3 hours of aeration, 1 hour of sedimentation, 1.5 hours of drainage, and 2 hours of idle time. The water quality indicators of the wastewater before and after the reaction are shown in Table 3.

[0039] Table 3 Chlorine dioxide + Fe 2+ +SBR treats waste water quality data

[0040] water ...

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Abstract

The invention provides a method for treating wastewater generated by a cyclohexanone ammoximation process, which comprises the following steps: performing advanced oxidation reaction on the wastewater to be treated; and then, adopting a sequencing batch reactor (SBR) to perform treatment. The method firstly adopts an advanced oxidation method to carry out oxidation reaction on organic matters in the wastewater generated by the cyclohexanone ammoximation process so as to improve the biodegradability of the wastewater and reduce the content of the organic matters in the wastewater simultaneously, and then adopts a treatment method of the SBR to further remove the organic matters in the wastewater and remove ammonia nitrogen in the wastewater, so that the treated wastewater meets the requirement of up-to-standard discharge.

Description

technical field [0001] The invention relates to a method for treating production wastewater in petrochemical plants, in particular to a method for treating production wastewater in a cyclohexanone ammoximation process. Background technique [0002] Caprolactam is a monomer for synthesizing nylon-6 fibers and nylon-6 engineering plastics, and is widely used in the field of polymer materials. Cyclohexanone oxime is a key intermediate in the production of caprolactam, and more than 90% of caprolactam in industry is produced through cyclohexanone oxime. In recent years, the research on the production process of caprolactam, especially the research on cyclohexanone oxime has made remarkable progress. Many economical and environmentally friendly new processes have been developed and applied. While the application of new processes has brought economic benefits to enterprises, it has also changed the quality and quantity of wastewater and increased the difficulty of wastewater trea...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72C02F3/12C02F103/36
CPCY02W10/10
Inventor 高峰桑军强李本高马欣
Owner CHINA PETROLEUM & CHEM CORP
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