Zero-discharge treatment system and process for MBT-containing industrial wastewater

Abstract

The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a zero-discharge treatment system and process for MBT-containing industrial wastewater. Thesystem comprises an MBT recovery system, an oxygenolysis system, an evaporation desalination system and a tail gas purification system, wherein a recovery device in the MBT recovery system is connected with a micro-electrolysis reaction kettle in the oxygenolysis system, and a water outlet of an O3 oxidation reaction kettle in the oxygenolysis system is connected with a water inlet of a transfertank in the evaporation desalination system; and exhaust ports of the micro-electrolysis reaction kettle, the O3 oxidation reaction kettle, the evaporation crystallizer and the thickener are connectedwith a tail gas purification system. The zero-discharge treatment system for the industrial wastewater containing the MBT can stably operate for a long time, is simple to use, reduces the recovery cost, can recover the MBT in the wastewater to the maximum extent, and has great economic significance and environmental protection benefits.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a zero-discharge treatment system and process for industrial wastewater containing MBT. Background technique [0002] 2-Mercaptobenzothiazole (MBT) is a commonly used rubber accelerator, and it is also an intermediate for the production of other accelerators such as: MZ, DM, NS, DIBS, CA, DZ, NOBS and MDB, etc., and is widely used Rubber industry. However, since MBT belongs to the A2 carcinogens and is extremely toxic to aquatic organisms, it may have long-term adverse effects on the water environment, so the industrial wastewater treatment technology containing MBT has become the focus of attention. [0003] CN 110683680A discloses a biological pretreatment system for wastewater produced by MBT. The system is a pretreatment process system for biochemically degrading MBT. Through sequentially connected adjustment tanks, lift pumps, chemical ox...

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Problems solved by technology

[0004] The disclosed technology provides a lot of methods and ideas for MBT wastewater treatment, but the following problems still exist in the prior art: 1. Due to the high economic value of MBT additives, few of the existing processes involve The technology of recovering MBT; 2. Most of the current treatment technologies adopt biochemical degradation method. Because the composition of wastewater is relatively complex, the change of salt content in wastewater will affect the biochemical effect and survival rate of biochemical bacteria, which increases the difficulty and difficulty of treatment. cost

According to the actual oxidation test, the process of oxidation of MBT to benzothiazole and 2-hydroxybenzothiazole in this reaction is fast and rapid, which leads to the use of O in engineering practice. 3 When the oxidation method is used to treat MBT-containing wastewater, a large amount of benzothiazole and 2-hydroxybenzothiazole are produced in the early stage of the reaction. These intermediate products will aggregate into groups before the next step of reaction, forming a viscous substance, which adheres to the reactor and pipe inner wall, reducing the O 3 The oxidation efficiency also reduces the purification treatment effect, and also causes damage to the purification equipment and pipelines

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