Simple process for treating wastewater containing various dyes

Abstract

The invention relates to a simple process for treating wastewater containing various dyes. The simple process is characterized by comprising the following steps: a. grate treatment: the wastewater containing multiple disperse dyes is subjected to grate treatment to remove large particles and then enters an adjusting tank 1; b, pH value adjustment: industrial hydrochloric acid is used to adjust pH of wastewater to 3-5, and then the wastewater enters an adsorption tank; c. desilted sludge adsorption: the desilted sludge is fed to the adsorption tank in advance; a mass-volume ratio of the desilted sludge to water is 6-10 kg / m3; the colority removal rate of the wastewater after adsorption treatment reaches 98%; the COD removal rate is 20-35%; d, treatment with an aerobic activated sludge method: supernatant after settlement enters an adjusting tank 2, is mixed with fabric base boiled and smelted wastewater until the pH is 6-8, then is pumped into the aeration tank, and is treated by the aerobic activated sludge method in the aeration tank, wherein the hydraulic retention time is 12 hours.

Description

technical field [0001] The invention relates to a simple process for treating wastewater containing various dyes. Background technique [0002] The printing and dyeing industry has a large amount of wastewater, high content of organic waste, and deep color. Although the COD is high, the BOD / COD value is small and the biochemical properties are poor. It is recognized as one of the difficult-to-treat industrial wastewater. At present, there are several methods to deal with printing and dyeing wastewater. (1) Biological method: Biological treatment is widely used in the treatment of urban domestic sewage, but the direct treatment of printing and dyeing wastewater by biological method is greatly affected by the temperature, pH value, dye type, etc. of the wastewater, and it is easy to cause sludge swelling and polymer group disintegration etc., which leads to poor treatment effect, and the treated wastewater cannot be discharged up to the standard; and the high concentration an...

AI Technical Summary

Problems solved by technology

(1) Biological method: Biological treatment is widely used in the treatment of urban domestic sewage, but the direct treatment of printing and dyeing wastewater by biological method is greatly affected by the temperature, pH value, dye type, etc. of the wastewater, and it is easy to cause sludge swelling and disintegration of polymer groups etc., resulting in poor treatment effect, and the treated wastewater cannot be discharged up to standard; and printing and dyeing wastewater has high concentration and high toxicity, and direct treatment of wastewater will easily cause the death of bacteria in the sludge, resulting in the failure of wastewater treatment to meet the standard

(2) Physical adsorption method: activated carbon porous adsorption materials are commonly used to adsorb dyes and other substances. It is easily affected by the pH of wastewater, suspended solids in wastewater, polymer pollutants, grease, etc., and the consumption is large and the cost is high; The effect on chromaticity is more obvious, but the ability to remove COD is not strong

o 3 Oxidation method equipment cost is high, dosage is large, Cl 2 The oxidation method is highly toxic and causes secondary pollution; the flocculation method is widely used because of its low investment cost, small equipment footprint, large processing capacity, and high decolorization rate, but some dye wastewater cannot achieve the purpose of decolorization and COD removal by direct flocculation

Images