Printing and dyeing wastewater treatment process

Abstract

The invention discloses a printing and dyeing wastewater treatment process which comprises the following steps: adding a filter aid into wastewater, flocculating the wastewater, filtering to remove suspended matters from the wastewater, and reserving small suspended matters with colors and dissolved matters; adding a reducing decolorizer into the wastewater subjected to primary filtration for treating dyeing wastewater of direct dyes, so that dye molecules in the wastewater form a reductive degradation product; enabling the wastewater containing the reductive degradation product to pass through an adsorption material for adsorbing the reductive degradation product or other materials in the wastewater to the solid surface due to the adsorption effect; pouring a non-water-soluble organic solvent into the wastewater subjected to adsorption, and vibrating the solvent and the wastewater together, wherein the water phase is colorless when two phases are separated, and the dyes are accumulated on the upper-layer organic phase; and pouring a certain quantity of clean water into the wastewater subjected to extraction for diluting the wastewater. The process has the advantages that the pH value of the wastewater does not need to be adjusted, the effect is good, and the cost is low.

Description

technical field [0001] The invention relates to a printing and dyeing wastewater treatment process. Background technique [0002] Since the reform and opening up, China's textile industry has been developing more and more. Among them, the printing and dyeing industry has also developed extremely rapidly, and its production capacity has expanded. A large amount of water is consumed in production, and a large amount of wastewater is produced at the same time. This printing and dyeing wastewater has high chroma and complex components, and cannot be discharged directly. It is very difficult to treat. Nowadays, most wastewater treatment mainly adopts biochemical methods, and the treatment technology is single When adjusting the pH value of wastewater, it is necessary to add acid or lye to increase the cost. A few companies have begun to use various types of reverse osmosis membranes to treat wastewater, and the treatment effect is good. However, this type of membrane device requi...

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Problems solved by technology

[0002] Since the reform and opening up, my country's textile industry has been developing more and more. Among them, the printing and dyeing industry has also developed extremely rapidly, and its production capacity has expanded. A large amount of water is consumed in production, and a large amount of wastewater is produced at the same time. This printing and dyeing wastewater has high chroma and complex components, and cannot be discharged directly. It is very difficult to treat. Nowadays, most wastewater treatment mainly adopts biochemical methods, and the treatment technology is single When adjusting the pH value of wastewater, it is necessary to add acid or lye to increase the cost. A few companies have begun to use various types of reverse osmosis membranes to treat wastewater. The treatment effect is good, but this type of membrane device requires a large investment and high operating costs.

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