Industrial wastewater decoloring treatment process

Abstract

The invention discloses an industrial wastewater decoloring treatment process. The process comprises the following steps: the pH value of wastewater is adjusted, an adsorption and oxidation reactor filled with adsorption resin is introduced, a lot of chormophoric organics are adsorbed in the resin, when the chroma removal rate is less than 60%, drainage is performed, a liquid-phase oxidant is added in the adsorption resin to perform oxidative decoloration, the resin is activated and regenerated; and after the pH value of the discharged water of the adsorption and oxidation reactor is adjusted, the discharged water enters a catalytic oxidation reactor, the adsorption resin loaded with a transition metal catalyst is filled in the reactor, and the liquid-phase oxidant is added to perform heterogeneous catalytic oxidation decoloration and remove the small molecules and nonpolar chormophoric organics which are difficult to be adsorbed by the adsorption and oxidation unit. By adopting the method, the polar and nonpolar chormophoric organics with wide molecular weight range can be removed and the effects of efficient decoloring and wide applications can be achieved.

Description

technical field [0001] The invention relates to water pollution control and waste water treatment technology, in particular to an industrial waste water decolorization treatment process. Background technique [0002] Industrial wastewater such as pharmaceutical wastewater, printing and dyeing wastewater, and chemical wastewater is recognized as difficult to treat, and the chromaticity of wastewater often becomes the bottleneck indicator for the standard treatment of these wastewater and the reuse of reclaimed water. These wastewaters contain a variety of chromogenic organic compounds, unsaturated chromophoric groups such as ethylenic bonds, carboxyl groups, amido groups, sulfonamide groups, carbonyl groups and benzene rings are common in chromogenic organic compounds, and -NH 2 , -NHR, -NR 2 , -OR, -OH and -SH and other auxochromic groups, their interaction makes the color of wastewater very high. [0003] From the perspective of currently applied wastewater treatment tech...

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Problems solved by technology

[0014] Industrial wastewater such as pharmaceutical wastewater, printing and dyeing wastewater, and chemical wastewater is generally difficult to achieve chromaticity with a single method

The coagulation method has a poor removal effect on water-soluble chromogenic organic compounds; the adsorption method has problems such as high regeneration costs of the adsorbent; the chemical oxidation method has strong selectivity, and the selection of a suitable catalyst is the most critical; The decolorization efficiency is not high

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