Wastewater treatment process for hydrogen peroxide production

Abstract

The invention discloses a wastewater treatment process for hydrogen peroxide production, and relates to a wastewater treatment process. According to the method, the problem of hydrogen peroxide production wastewater treatment is thoroughly solved mainly through a combined process of iron-carbon micro-electrolysis, Fenton oxidation, coagulating sedimentation, hydrolytic acidification and CASS (cyclic activated sludge system). Firstly, an iron-carbon micro-electrolysis-Fenton oxidation pretreatment process is applied, ring opening is performed, heavy aromatics in sewage are reduced, the wastewater is easy to degrade, and the load of biochemical treatment is reduced; then, coagulating sedimentation treatment is carried out to remove total phosphorus; and finally, a hydrolytic acidification and CASS scheme is used to deeply remove CODcr and phosphate, so that the wastewater reaches the discharge standard. The combined process has the advantages of wide application, good treatment effect, simplicity in operation and management and low cost.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a waste water treatment process for producing hydrogen peroxide. Background technique [0002] At present, the comprehensive sewage discharged from the domestic hydrogen peroxide production process mainly includes the washing water of the working fluid, the condensate produced by the clay bed regeneration process, the condensate and soaking water produced by the regeneration of the hydrogenation tower, and other wastewater such as washing equipment and the ground. These wastewaters mainly contain pollution factors such as 2-ethylanthraquinone, 1,3,5-trimethylbenzene, trioctyl phosphate, phosphoric acid and potassium carbonate. Therefore, the treatment of hydrogen peroxide production wastewater is actually to reduce CODcr (chemical oxygen demand) and remove phosphate. At present, there are many methods to reduce CODcr and remove phosphate. better. In general, the main treatment...

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Problems solved by technology

[0004] 1) It is difficult to remove CODcr and phosphate in the sewage well only by physical and chemical measures, which essentially makes the organic matter in the sewage move to the sedimentation sludge;

[0005] 2) The advanced oxidation method with high processing capacity has high requirements on facilities and equipment, consumes electricity and materials, and is expensive and uneconomical;

[0006] 3) The traditional activated sludge process has a high concentration of pollutants in the hydrogen peroxide production wastewater, contains refractory heavy aromatics, and the water quality and quantity are unstable. Its treatment effect has been difficult to meet the latest sewage discharge standards

However, as far as we know from the literature search, the current research on hydrogen peroxide production wastewater is mainly based on physical and chemical methods. However, as the country’s environmental protection requirements become increasingly stringent, it is difficult to meet the requirements only by using physical and chemical methods. It also needs to be combined with biochemical treatment. Wastewater can be discharged up to standard only after combined process treatment

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