Ammoximation wastewater treatment method and application thereof

A treatment method and ammoximation technology, which can be applied in special compound water treatment, natural water treatment, multi-stage water treatment, etc., can solve the problems of high content of organic nitrogen, difficult to reach the standard of total nitrogen, difficult to handle, etc., and achieve good results. , Complementary functions, good effect

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the actual operation of several caprolactam production and polymerization enterprises in China in recent years, the organic matter in the wastewater treated by the anoxic / aerobic process can reach the standard, but the total nitrogen is difficult to reach the standard
The content of organic nitrogen in ammonia oximation wastewater is high, complex, and difficult to treat, which is the main reason why the total nitrogen of caprolactam wastewater is difficult to meet the standard, and even some actual operation of caprolactam wastewater treatment projects in the tail process shows that the ammonia nitrogen in the effluent is higher than the ammonia nitrogen in the influent. Therefore, it is necessary to develop a new and technically feasible process to pretreat the organic nitrogen in the ammonia oximation wastewater, so that the organic nitrogen can be mineralized to the greatest extent in the pretreatment stage, and avoid its slow transformation and influence in the main treatment process. The phenomenon of total nitrogen and ammonia nitrogen in the effluent, so as to ensure that the discharge of total nitrogen in wastewater meets the standard

Method used

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  • Ammoximation wastewater treatment method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The caprolactam production unit of a petrochemical plant discharges ammonia oximation wastewater. The characteristics of the wastewater are: COD3025mg / L, pH8.5, total nitrogen 938.8mg / L, organic nitrogen 247mg / L, BOD 5 / COD0.002. The waste water is treated as follows:

[0058] Step 1: Acidic environment strengthens coagulation settlement.

[0059] Add 80 mg / L polyaluminum chloride to the waste water, and stir for 25 minutes to react. Afterwards, the pH of the waste water was adjusted to 3.0 with sulfuric acid, and further settled. After 25 minutes, add 35 mg / L non-ionic polyacrylamide coagulant, react for 1 hour, and filter. Product water COD2625mg / L, total nitrogen 815mg / L, organic nitrogen 123mg / L, BOD 5 / COD 0.01.

[0060] Step 2: Iron-carbon micro-electrolysis-Fenton synchronous treatment.

[0061] Add hydrogen peroxide to the coagulation effluent at a rate of 3000 mg / L and mix evenly, enter the iron-carbon bed, and iron-carbon micro-electrolysis and Fenton ox...

Embodiment 2

[0067] The caprolactam production unit of a petrochemical plant discharges ammonia oximation wastewater. The characteristics of the wastewater are: COD3170mg / L, pH8.5, total nitrogen 1284mg / L, organic nitrogen 599mg / L, BOD 5 / COD0.005. The waste water is treated as follows:

[0068] Step 1: Acidic environment strengthens coagulation settlement.

[0069] Add 100 mg / L polyaluminum chloride to the waste water, and stir for 25 minutes. Afterwards, the pH of the waste water was adjusted to 3 with sulfuric acid, and further settled. After 25 minutes, add 40 mg / L non-ionic polyacrylamide coagulant, react for 1 hour, and filter. Product water COD2416mg / L, total nitrogen 950mg / L, organic nitrogen 310mg / L, BOD 5 / COD 0.01.

[0070] Step 2: Iron-carbon micro-electrolysis-Fenton synchronous treatment.

[0071] Add hydrogen peroxide to the coagulation effluent at a rate of 3500mg / L and mix evenly, enter the iron-carbon bed, and iron-carbon micro-electrolysis and Fenton oxidation reac...

Embodiment 3

[0077] The caprolactam production plant treated in Example 2 is used to discharge ammonia oximation waste water, the water quality characteristics of waste water are: 3170mg / L, pH8.5, total nitrogen 1284mg / L, organic nitrogen 599mg / L, BOD 5 / COD0.005. The waste water is subjected to conventional flocculation treatment, and the steps are as follows:

[0078] Step 1: Add 100mg / L polyaluminum chloride, stir and react for 25min;

[0079] Step 2: adjusting the pH of the wastewater to 5.0 with sulfuric acid;

[0080] Step 3: After 25 minutes, add 40 mg / L non-ionic polyacrylamide coagulant, react for 1 hour, and filter. Product water COD 2579mg / L, total nitrogen 1058mg / L, organic nitrogen 376mg / L, BOD 5 / COD 0.01.

[0081] Comparing the treatment results of Step 1 of Example 2 with that of Example 3, with the same dosage and reaction time, the effluent COD, total nitrogen, and organic nitrogen are all higher, and the treatment effect is not good.

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Abstract

The invention provides an ammoximation wastewater treatment method and application thereof. The treatment method of the ammoximation wastewater provided by the invention comprises the following steps: S1, carrying out coagulating sedimentation on the ammoximation wastewater to obtain wastewater subjected to coagulating sedimentation; s2, carrying out iron-carbon micro-electrolysis-Fenton oxidation synchronous treatment on the wastewater subjected to coagulating sedimentation to obtain wastewater subjected to synchronous treatment; and S3, carrying out biochemical treatment on the synchronously treated wastewater. The processes are combined and synergistic, so that the influence of organic nitrogen on wastewater treatment is basically eliminated, and up-to-standard discharge of ammoximation wastewater can be realized.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a method for treating ammonia oximation wastewater and its application. Background technique [0002] In the production of caprolactam, a very important step is to prepare cyclohexanone oxime from cyclohexanone, that is, cyclohexanone is directly ammoxidized with hydrogen peroxide under the action of a titanium silicon catalyst to generate cyclohexanone oxime, and the waste water COD produced by the ammoximation process As high as 2000-12000mg / L, the total nitrogen in wastewater is composed of ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and organic nitrogen, of which ammonia nitrogen is converted into nitrate nitrogen through biochemical aerobic nitrification, and nitrate nitrogen and nitrite nitrogen can be converted into nitrate nitrogen through anoxic reaction. Nitrification removal, the key pollutant that affects the total nitrogen in wastewater is orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36C02F101/38
CPCC02F9/00C02F1/5245C02F1/56C02F1/46176C02F1/722C02F2305/026C02F1/66C02F3/00C02F2103/36C02F2101/38C02F2209/08C02F2209/14C02F2209/16C02F2209/06C02F2301/08
Inventor 孙杰曹宗仑龚小芝杨晏泉王珺张英雄
Owner CHINA PETROLEUM & CHEM CORP
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