Chemical industry waste alkali liquid treatment method

Abstract

The invention provides a chemical industry waste alkali liquid treatment method, which comprises: 1) pumping a waste alkali liquid into a gravity settling tank, settling for 24-48 h, and separating oil substances and inorganic impurities from the waste alkali liquid; 2) conveying the waste alkali liquid obtained in the step 1) to a heat exchanger by using a waste alkali liquid feeding pump, and preheating in the heat exchanger to achieve a temperature of 30-60 DEG C; 3) pumping the pre-heated waste alkali liquid into an ultrasonic wave compressed air blowing tower from the top portion, wherein a volume ratio of the blowing air to the waste alkali liquid is 100-5000:1, the ultrasonic wave frequency is 10-400 KHz, the sound intensity is 3-17 W / cm<2>, the ultrasonic wave and air blowing synergistic time is 10-30 min, and the volatile pollutants in the waste alkali liquid are changed into the gas phase from the liquid phase; and 4) discharging the waste alkali liquid from the bottom portion of the ultrasonic wave compressed air blowing tower, entering a porcelain sand filter, and filtering, wherein the filtration rate is 10-35 m / h, and the residence time of the waste alkali water in the porcelain sand filter filler is 1-10 min.

Description

technical field [0001] The invention relates to a method for treating chemical waste lye. Background technique [0002] Most of the waste lye generated in the production process of petrochemical enterprises is discharged into the sewage treatment plant after pretreatment, and it is basically not comprehensively utilized, which not only wastes resources but also causes certain pollution to the environment. The waste lye produced by the cracking gas alkali washing of an ethylene cracking unit in a petrochemical company is currently pretreated by a wet oxidation process to oxidize toxic substances such as organic sulfides into harmless thiosulfates and sulfates, and then reuse Concentrated sulfuric acid for neutralization, concentrated sulfuric acid and NaOH, Na 2 CO 3 Wait for the reaction of alkaline substances, and the neutralized waste lye is discharged into the downstream sewage treatment plant for biochemical treatment after being stripped. During the operation of the ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems in the prior art, the present invention provides a treatment method for chemical waste lye, overcomes the deficiencies of the prior art, provides a treatment method and device for chemical waste lye, realizes high desulfurization efficiency, and eliminates the need for desulfurization Gray and peculiar smell, realize the treatment of waste with waste, solve the problem of waste lye treatment and environmental pollution