Method for recycling purified terephthalic acid wastewater

Abstract

The invention provides a treatment method for the reuse of purified terephthalic acid (PTA) waste water, which belongs to the technical field of environment engineering and industrial waste water treatment. The particular method is as follows: polyacrylamide solution with mass concentration of between 1 and 2 thousandth is adopted for flocculate sedimentation pretreatment on the PTA waste water, the adding amount of the polyacrylamide solution is 1.5 to 1 percent of the volume of the waste water; the waste water after treatment enters an oxidation tank for advanced oxidation degradation reaction; in the reaction, a fan is used to blow air to a reaction tank; and the waste water after treatment can be directly used for production of workshop, wherein the concentration of the main oxidizing agent which is hydrogen peroxide is between 20 and 30 percent; auxiliary oxidants of sodium chlorate and potassium persulphate are industry graded; and the adding amount of sodium chlorate and potassium persulphate is 0.1 to 0.2 percent and 0.1 to 0.2 thousandth of the weight of the waste water respectively. Compared with the prior waste water reuse process, the method has the advantages of low investment, simple and convenient operation, high treatment efficiency and the like. The method realizes the reuse of the PTA waste water, relieves the pressure of insufficient water resources and meets the general policy of China on energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering and industrial waste water treatment, and relates to a method for recycling waste water produced by purified terephthalic acid to achieve zero discharge. Background technique [0002] With the rapid development of the economy and the rapid increase of the population, the shortage of water resources and the deterioration of the water environment seriously restrict the development of our country's economy and society. In order to solve the increasingly tense problem of water resources, people have taken wastewater reuse as an important way to achieve sustainable development of water resources while looking for new water sources. [0003] PTA (purified terephthalic acid) is an important raw material for the production of synthetic resins, polyester fibers and other products. In recent years, due to the rapid increase in demand for PTA in domestic PET and other industries, the output...

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Problems solved by technology

The activated carbon adsorption method has the disadvantages of short saturation period, difficult regeneration, and its adsorption capacity decreases to varying degrees after regeneration; the membrane separation method has problems such as high investment, short life, high water quality requirements, easy clogging, and difficult cleaning.

The biological method generally refers to the biological activated carbon technology combined with the physical method. It hangs the microbial film on the surface of the activated carbon channel. Although it can solve the problem of activated carbon regeneration, it is difficult to apply to large-scale because of its high cost, stable water quality and demanding operation. water treatment

[0005] Patent CN101234814A uses a combination of biological method and membrane method to reuse printing wastewater. Although the effluent can meet the requirements of reuse water, this method is only suitable for wastewater with a small amount of water, and it is susceptible to water quality fluctuations and land occupation. Disadvantages of large area

Both the patent CN101224357A and the patent CN101224930A use the membrane method to treat printing and dyeing wastewater, but both have the disadvantages that the membrane is easy to block and cleaning is difficult

Patent CN1982223A uses activated carbon adsorption and catalysis to recycle synthetic leather wastewater. This method has the problems of easy blockage of activated carbon pores and difficulty in catalyst regeneration.

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