Purifying treatment method for industrial sewage

Abstract

The invention belongs to the technical field of water treatment and relates to a purifying treatment method for industrial sewage, in particular to a method and a device for ultraviolet-Fenton reagent-biological joint treatment. The industrial sewage is subject to flocculent settling pre-treatment and then flows into a photocatalytic oxidation pool for photocatalytic reaction so as to further reduce the COD of the sewage and improve the biodegradability thereof. Compared with the prior art, the purifying treatment method overcomes the shortcomings that the conventional biofiltration technology has low treatment efficiency, large occupation area and the like when treating the difficult degradable organic waste water. Meanwhile, the joint process further effectively reduces the defects of incomplete decomposition and production of toxic product caused by the ultraviolet oxidation technology, reduces the potential risk to the environment and the human health and further improves the economical efficiency of sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for purification and treatment of industrial sewage, in particular to a method and a device for combined treatment of ultraviolet rays-Fenton reagent-biology. Background technique [0002] In recent years, many scientific researchers have studied the application of Fenton method in the field of water treatment. For example, Li Shaofeng, Zhang Xiuzhong and others used Fenton reagent to treat water samples prepared by nine kinds of dyes such as active K-2RL and H-E2R. It is concluded that when the dye concentration is 400mg / L, the removal rate of chroma is over 95%, the removal rate of COD is 65%-85%, and the removal rate of TOC is 70.2%. Chen Fangyan used Fenton reagent to study the degradation and decolorization of reactive brilliant orange X-GN dye, and the decolorization rate of 500mg / L dye wastewater reached 99% after treatment. Lynch, M.R. et al. of the Intern...

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Problems solved by technology

[0004] For sewage that is difficult to biodegrade, if the UV-Fenton method is used alone, there are disadvantages such as high reagent and operating costs, and if it is used in combination with the biological method, there will be excessive H in the water. 2 o 2 Inhibit the growth of subsequent microorganisms and other issues, resulting in poor system operation

For the advanced treatment of sewage, the sewage has undergone some preliminary treatment, and its COD concentration is between 100 and 500mg / L. Due to the low concentration of organic matter in the sewage, the H in the process of using the Fenton method 2 o 2 The utilization rate is low, and excess H needs to be added to the water 2 o 2 In order to ensure that the organic matter in the wastewater is effectively degraded, there are disadvantages such as high medicament and operating costs. Similarly, if it is used in conjunction with the biological method, there will be excessive H in the water. 2 o 2 Inhibit the growth of subsequent microorganisms and other issues

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