Method for treating weak acid blue AS dye production wastewater

Abstract

The invention discloses a method for treating weak acid blue AS dye production wastewater. The method comprises the following steps: adjusting the pH value of the weak acid blue AS dye production wastewater to about 5; adding hydrogen peroxide into the wastewater according to a weight ratio of hydrogen peroxide to the wastewater being 1000:(5-10), uniformly mixing hydrogen peroxide and the wastewater, and then pumping the wastewater mixed with hydrogen peroxide into a cartridge filter for interception of suspended solids in the wastewater; triggering a 1.5-2.5 hours' catalytic oxidation reaction on organic substances in the wastewater under the catalytic action of a surface catalyst; pumping the wastewater subjected to the catalytic oxidation reaction into a biochemical water distribution reservoir, and adjusting the pH value of the wastewater to 7.5-8; pumping the wastewater with the adjusted pH value into a biochemical system for degradation of organic substances and total nitrogen in the wastewater, wherein the residence time is 18-30 hours; pumping a mixed solution comprising the wastewater subjected to degradation and sludge into a secondary sedimentation tank, wherein a standard supernatant is discharged and the sludge is treated later. Through the adoption of the method, the effluent chroma removing rate and the COD removing rate of the treated wastewater reach up to 94.0% and 96.0% respectively; the effluent can reach the discharge standards; the environmental and economic benefits are high.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating weak acid blue AS dye production wastewater. Background technique [0002] Acid dye wastewater has complex components, most of which contain sulfonic acid groups, hydroxyl groups, and carboxylic acid groups, and have excellent water solubility. Weak acid blue AS dyes are produced from raw materials such as bromoic acid, aniline, soda ash, catalysts and other raw materials through condensation, pressure filtration, beating, hot melting, secondary pressure filtration, drying and other steps to obtain finished products. The wastewater mainly comes from condensation and thermal filtration. The main pollutants are aniline, weak acid blue AS dye, salt, etc. The concentration of organic matter reaches 2000mg / L, the chromaticity reaches 500 times, and the salt content reaches 5000mg / L. The treatment is relatively difficult. big. [0003] At present, the main method...

AI Technical Summary

Problems solved by technology

The micro-electrolysis method mainly uses iron and carbon to form a primary battery under acidic conditions, and uses the redox potential difference to degrade the organic matter in the wastewater, but the treatment efficiency is low, and the transfer of pollutants is easy to occur at the same time, causing secondary pollution to the environment;

[0004] The advanced oxidation method requires the use of oxidants to degrade the organic matter in the wastewater under high temperature and high pressure conditions. The reaction conditions are harsh and the operating cost is high; It is a water treatment method that separates and removes, but the removal efficiency of soluble organic matter is low, and it is also prone to the transfer of pollutants, causing secondary pollution to the environment