Printing and dyeing wastewater sludge treatment and recycling method

Abstract

The invention discloses a printing and dyeing wastewater sludge treatment and recycling method, which comprises the following steps: converging production wastewater into an adjusting tank, introducing sludge of a final settling tank during the process that the production wastewater flows to a primary settling tank from the adjusting tank, draining the sludge generated in the primary settling tank, enabling production waste water to flow into a hydrolysis tank, an activated tank and a secondary settling tank, then feeding into a contact aeration tank, adding a reagent into the contact aeration tank, then feeding into the final settling tank, draining the up-to-standard production wastewater, and recycling sludge generated in the final settling tank so as to be used for treatment in the primary settling tank and replacement of a reagent of the primary settling tank, thus repeatedly recycling, wherein the sludge in the final settling tank contains a reagent component and activated strains; the reagent is a mixture of ferrous sulfite and sodium carbonate. The printing and dyeing wastewater sludge treatment and recycling method has the beneficial effects that by utilizing sludge in the final settling tank as the reagent of the primary settling tank and combining the sludge in the final settling tank and sludge in the primary settling tank, the sludge pressing effect is more obvious, the operation procedures are simple and convenient, secondary pollution can be reduced, and the sewage treatment cost can be saved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating and recycling printing and dyeing wastewater sludge. Background technique [0002] The printing and dyeing industry is a large discharge of industrial wastewater. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in the country is 3×106~4×106m3. Printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, deep color, high alkalinity, and large changes in water quality. It is a difficult-to-treat industrial wastewater. Some textile enterprises produce hundreds of thousands of tons of production wastewater a year, and the cost of chemicals to treat these wastewater is a lot of money, and the wastewater treated with chemicals will also produce a large amount of sludge, and it will cost a lot of money. It costs too much money, manpower and material resources to...

AI Technical Summary

Problems solved by technology

Some textile enterprises produce hundreds of thousands of tons of production wastewater a year, and the cost of chemicals to treat these wastewater is a lot of money, and the wastewater treated with chemicals will also produce a large amount of sludge, and it will cost a lot of money. It costs too much money, manpower and material resources to treat printing and dyeing wastewater with the existing technology, which has a certain impact on the economic benefits of the enterprise. In order to realize the sustainable development of the printing and dyeing industry, the resource reuse of printing and dyeing wastewater has become the realization of this key to a goal

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