Textile printing and dyeing wastewater treatment method

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a textile printing and dyeing wastewater treatment method. The textile printing and dyeing wastewater treatment method comprises the following steps: step 1, regulating and treating wastewater collected by a water collecting well in a regulating tank; step 2, carrying out first-stage treatment in a coagulation tank; step 3, carrying out treatment in a primary sedimentation tank; step 4, carrying out treatment in an anoxic / oxic (A / O) tank; step 5, carrying out treatment in a secondary sedimentation tank; step6, carrying out treatment in an ozone tank; step 7, carrying out treatment in a membrane bioreactor (MBR) tank; and step 8, carrying out backwashing and discharging. Through a reflux design and combination of the ozone tank, the MBR tank and a biological aerated filter tank, the textile printing and dyeing wastewater treatment method can be used to reduce the aniline concentration, the total nitrogen concentration, the organic matter concentration and the chromaticity of discharged water, and water quality can be improved. In addition, the design of large reflux gradient oxygen dissolution isadopted in the aspect of the biochemical process, namely the mixed solution discharged after treatment in the A / O tank is refluxed again so as to strength the capability of biological nitrogen and phosphorus removal.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating textile printing and dyeing wastewater. Background technique [0002] Industrial wastewater, especially textile printing and dyeing wastewater, must be treated to meet the standard before it can be discharged. As the country's requirements for environmental protection become more and more stringent, the requirements for the treatment of industrial wastewater are also becoming more and more stringent. In the prior art, the waste water treatment method is as follows: the waste water enters the second-stage system for treatment after passing through the collecting well, and after the second-stage system is treated, the waste water is pumped to the first-stage system by the sludge return pump of the final settling tank for further treatment. After the in-depth treatment of the system in the first stage, the wastewater will be discharged to the disc...

AI Technical Summary

Problems solved by technology

However, the wastewater treatment method in the prior art has the following defects: (1) there are many air bubbles during treatment, and the chroma removal effect is not obvious; (2) the water quality homogenization effect of the regulating tank is poor, resulting in unstable water intake to the system, The effect of coagulation tank is poor; (3) The salt detection at the water outlet is high, the consumption of chemicals is high, and the total nitrogen content is high; (4) Because the raw water quality changes greatly and there are many substances that are difficult to biochemically degrade directly, the existing conventional system does not Stable, for example, the biochemical system is prone to collapse, causing the effluent water quality to be unstable and reach the standard, especially the aniline substances are easy to exceed the standard

Images