Condensation mother liquid waste water pretreatment and resource system and method in compound neutralization reactor in disperse blue 56 production process

Abstract

The invention discloses a compound neutralization reactor and a condensation mother liquor wastewater pretreatment and resource utilization system and method in the production process of dispersed blue 56, and belongs to the field of wastewater treatment. It neutralizes the condensation mother liquor wastewater and mixed acid solution (sulfuric acid, sulfamic acid) in the production process of highly alkaline Dispersed Blue 56 in a compound neutralization reactor, thereby reducing the pH value of the wastewater, precipitating phenol, and removing nitrous acid Three purposes are achieved at the same time; the neutralized wastewater passes through a fixed-bed adsorption column equipped with adsorption resin, so that the residual phenol in the wastewater is adsorbed on the resin column. The adsorbed saturated resin can be reused after desorption and regeneration with NaOH solution. The desorption solution undergoes acid adjustment and vacuum distillation of phenol to realize the resource utilization of phenol. The present invention pretreats the condensation mother liquor wastewater in the production process of Dispersed Blue 56. The CODCr value is reduced from about 55000mg / L to less than 500mg / L, the phenolic substance concentration is reduced from about 19000mg / L to less than 20mg / L, and the nitrite ion is reduced from about 19000mg / L to less than 20mg / L. 87000mg / L reduced to less than 20mg / L; effectively realizing wastewater treatment and resource utilization.

Description

technical field [0001] The present invention relates to a pretreatment and recycling of wastewater in the production process of Disperse Blue 56, in particular to a compound neutralization reactor and a system and method for pretreatment and resource recovery of condensation mother liquid wastewater in the production process of Disperse Blue 56. Background technique [0002] Disperse Blue 56 (Disperse Blue 56, CAS No.: 12217-79-7, also referred to as 56# blue) is an important dye, which will emit a large amount of strong alkali containing phenol and sodium nitrite in the production process Sexual wastewater, wastewater COD Cr About 55000mg / L, phenol content about 1.9% (mass fraction), nitrite ion content about 8.7% (mass fraction), pH>14, so the wastewater has high toxicity and poor biodegradability, and it is difficult to follow-up treatment. Effective governance can wreak havoc on the environment. There are three technical problems to be solved in the treatment proces...

AI Technical Summary

Problems solved by technology

[0003] Difficulties 1. Strong alkalinity in wastewater: The condensation mother liquid wastewater in the production process of Disperse Blue 56 is strongly alkaline and contains 8.7% nitrite ions. A large amount of highly irritating nitric oxide and nitrogen dioxide gas escapes, which not only pollutes the air, but also seriously endangers the health of operators;

[0004] Difficulty 2. Wastewater contains high concentration of sodium phenate: the condensation mother liquid wastewater in the production process of Disperse Blue 56 is strongly alkaline, and phenol exists in the form of sodium phenate in the wastewater. It is difficult to remove sodium phenate in alkaline aqueous solution by traditional resin adsorption method;

[0005] Difficulty 3. Wastewater contains a large amount of nitrite ions: the biological toxicity is high, and it is easy to become an important source of water eutrophication factor "nitrogen"

Images