A kind of method of alkaline demulsification and hydrolysis-contact oxidation system joint treatment taic production wastewater

A technology for producing wastewater and contact oxidation, which is used in neutralized water/sewage treatment, multi-stage water treatment, aerobic process treatment, etc. problem, to achieve the effect of no secondary pollution, low treatment cost, stable and continuous treatment

Active Publication Date: 2018-04-17
安徽汇泽通环境技术有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] TAIC is a colorless or slightly yellow oily liquid or hexagonal sheet at room temperature, hardly soluble in water, slightly soluble in alkanes, completely soluble in aromatic hydrocarbons, ethanol, acetone, and halogenated hydrocarbons, because its molecular structure has a high symmetry The chemical properties are very stable, it is difficult to remove by advanced oxidation methods or adsorption methods, and the treatment effect of a separate biochemical system will be even worse
Although some scholars have used iron-carbon micro-electrolysis or activated carbon adsorption to remove TAIC, on the one hand, the removal efficiency is relatively low, and the removal efficiency is not so high in practice. On the other hand, a large amount of iron filings and activated carbon need to be added. Causes higher treatment costs and secondary pollution (sludge is hazardous waste and also needs to be treated), so it is not suitable for engineering fields

Method used

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  • A kind of method of alkaline demulsification and hydrolysis-contact oxidation system joint treatment taic production wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The TAIC production wastewater used in this example is the wastewater produced by a TAIC manufacturer in Rudong using the cyanate process to produce TAIC. It mainly includes three pollutants: DMF, TAIC, and NaCl. The initial concentration of TAIC is 773mg / L. The concentration is 225mg / L, the COD is 20180mg / L, the salinity is 3%, and the pH is 4.5.

[0032] The present embodiment processes TAIC production wastewater according to the following steps:

[0033] (1) After the TAIC production wastewater is collected uniformly, it is introduced into the adjustment pool, and alkali is added to adjust the pH to 12;

[0034] (2) Subsequently, the TAIC production wastewater is introduced into the heating device, so that the TAIC production wastewater is heated to 60° C. to produce flocs;

[0035] (3) The heated TAIC production wastewater is introduced into the sedimentation tank, and the floc produced is precipitated into sludge;

[0036] (4) The supernatant in the sedimentation...

Embodiment 2

[0040] In this example, the same TAIC production wastewater was treated in the same manner as in Example 1, except that the heating temperature of the TAIC production wastewater in step (2) was 70°C.

[0041] After the TAIC production wastewater was treated according to the method of this example, the concentration of TAIC in the effluent of the sedimentation tank was 192 mg / L, the concentration of DMF was 19 mg / L, the COD was 5860 mg / L, and the salinity was 2.4%. The removal rate of TAIC reaches over 75%, the floc particles are relatively large, the sedimentation performance is very good, and the biochemical property is greatly improved. B / C can be improved to 0.34.

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Abstract

The invention discloses a method for performing combined treatment on TAIC industrial wastewater through alkaline demulsification and a hydrolysis-contact oxidation system. The method is characterized by comprising the following steps: performing alkalifying demulsification on TAIC industrial wastewater produced in the TAIC production process, heating the TAIC industrial wastewater so as to separate out TAIC, and producing floccules; and finally, sequentially settling the wastewater in a settling basin, mixing with domestic sewage and carrying out a biochemical reaction in the hydrolysis-contact oxidation system, and connecting the effluent to a sewage treatment plant after treatment, thereby finishing the treatment. According to the method disclosed by the invention, a simple and high-efficiency alkaline demulsification method serves as a pretreatment process of TAIC industrial wastewater which is difficult to biochemically degrade, 70 percent or above of TAIC contaminants in the TAIC industrial wastewater can be removed by virtue of the pretreatment process, and B / C can be improved to be 0.3 or above. Moreover, any adsorbent and flocculating agent do not need to be added, the treatment cost is low, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to a treatment method for TAIC production wastewater, which belongs to the field of industrial wastewater treatment. Background technique [0002] TAIC, also known as triallyl isocyanurate, is a multifunctional olefin monomer containing aromatic heterocycles, which is widely used in modifiers, crosslinking agents and vulcanization aids for various plastics and rubbers. It can be used in the synthesis of excellent flame retardants and is a fine chemical product with a wide range of uses. In industrial production, TAIC is usually prepared by the cyanate method. The main process is to obtain the TAIC product by extraction and separation after the polymerization of allyl chloride and cyanate, in which DMF is used as a solvent and NaCl together as the process By-products and a part of TAIC products enter into the flushing water to form TAIC production wastewater. [0003] TAIC is a colorless or slightly yellow oily liquid or hexagona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/02C02F1/66C02F3/02C02F9/00C02F2001/007C02F2103/36C02F2301/08
Inventor 孙亚兵徐跃武
Owner 安徽汇泽通环境技术有限公司
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