A photocatalyst immobilization method and a method for continuously treating printing and dyeing wastewater

Abstract

The invention discloses an immobilizing method of a photocatalyst and a continuous treatment method for printing and dyeing wastewater. The continuous treatment method comprises the following steps: adding the powdered photocatalyst to an emulsion prepared by dissolving a polyurethane prepolymer to deionized water, stirring at high velocity to mixing the substances uniformly to form a stable suspension, adding a cross-linking agent and an initiator to the suspension to form hydrogel, cutting the hydrogel into regular particles, namely obtaining the immobilized photocatalyst, filling the immobilized photocatalyst inside a cylindrical reactor, placing the reactor under sunlight or an artificial light source, turning on a printing and dyeing wastewater pump, and continuously degrading organic pollutants in the printing and dyeing wastewater under the photocatalysis. The method has the advantages that the loading capacity of the photocatalyst is high, the immobilized position is convenient and simple to operate, the operating cost is low, the CODcr (Chemical Oxygen Demand) removal rate of dyes and the printing and dyeing wastewater under sunlight can be up to 50-95%, and the continuous treatment method can be popularized well in the treatment of other industrial wastewater.

Description

technical field [0001] The invention relates to a photocatalyst in the field of environmental purification and a preparation method thereof, in particular to an immobilized photocatalyst and a method for continuously catalytic oxidation treatment of printing and dyeing wastewater. Background technique [0002] my country is in the stage of rapid development of the printing and dyeing industry. With the continuous expansion of printing and dyeing production capacity, a series of environmental problems have also emerged, one of which is the generation of a large amount of printing and dyeing wastewater. Since the whole process of dyeing and finishing requires a large amount of water for transportation, washing, dispersing materials and cooling equipment, etc., the amount of wastewater generated is large, generally reaching 70% to 90% of the water consumption of printing and dyeing enterprises. According to statistics, in 2010, the textile printing and dyeing industry discharge...

AI Technical Summary

Problems solved by technology

Researchers have designed different photocatalytic degradation methods according to the characteristics of photocatalytic degradation, which are mainly divided into suspension type and supported type. Among them, supported photocatalytic degradation is more conducive to the recovery and reuse of catalysts, but the current loading process has load The amount of catalyst is low, the catalytic contact area is small, which reduces the catalytic activity of titanium dioxide photocatalyst, leading to the problem of degradation efficiency, and the load-type photocatalytic method mostly uses batch treatment to treat wastewater, and continuous treatment of wastewater cannot be realized.

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