High-efficiency decolorizing additive agent for dyeing waste water and method for preparing same

Abstract

The invention discloses a highly efficient dye effluent discoloring additive and a preparation method thereof. The dye effluent discoloring additive is prepared basically by the materials in portion by mass: 2 to 2.2 portions of alkaline chitosan, 8 to 8.5 portions of dicyandiamide and 5 to 5.5 portions of aluminum sulfate. The preparation method comprises the steps of: charging in portion by mass the alkaline chitosan, the dicyandiamide and the aluminum sulfate, and fully and evenly mixing the mixture, controlling the reaction temperature between 50 and 55 DEC C, the reaction PH value between 2 and 2.5 for 3 to 3.5 hour reaction to obtain the discoloring additive. The discoloring additive prepared by the method presents an excellent effect in discoloring the dye effluent, the discoloring ratios for four typical dyes such as reactive orange, acidulous Kaprun red, neutral 2V25 black and 5 GS green are all over ninety-two percent, and the novel highly efficient dye effluent discoloring additive has no harmful substances remaining, belongs to a green environmental protection sewage treatment agent and meanwhile, the preparation method is simple in preparation, low in cost, convenient to use and has a better application value.

Description

(1) Technical field The invention relates to an efficient decolorizing additive for printing and dyeing wastewater and a preparation method thereof, and belongs to the technical field of wastewater treatment. (2) Background technology Printing and dyeing wastewater refers to the wastewater produced during the bleaching, dyeing, printing and finishing processes of natural fibers such as cotton, wool, and chemical fibers and chemical fiber textiles. The printing and dyeing industry is a major discharger of industrial wastewater. According to incomplete statistics, my country's daily discharge of printing and dyeing wastewater is about 3 to 4 million tons, and the annual discharge is about 650 million tons. Compared with developed countries, the unit water consumption of my country's textile printing and dyeing industry is 1.5-2.0 times that of developed countries, and the unit's total pollution discharge is 1.2-1.8 times that of them. Because of the different dyes and auxiliaries u...

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Problems solved by technology

The products after its initial degradation are mostly carcinogenic aromatic compounds such as benzidine, which are highly toxic. For example, phenols can affect the growth and reproduction of various organisms in water, and benzene has obvious toxicity to human nerves and blood vessels. effect

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