Treatment method of phenol-containing liquid waste in sebacic acid production

Abstract

The invention discloses a treatment method of phenol-containing liquid waste in sebacic acid production, specifically comprising the steps of extraction, back extraction, evaporation, regulation, anoxic biochemical reaction and aerobic biochemical reaction, and the like. The phenol-containing liquid waste is filtered to remove the insoluble substance, the phenol substance in the liquid waste is extracted by a specially selected extracting agent, the extract phase is back extracted by alkaline liquor and is regenerated to be recycled, and the back extraction solution is returned to a sebacic acid production system. The raffinate is transferred into an evaporation system to be evaporated and separated to obtain a sodium sulfate by-product, the evaporation condensed water is homogenized and equalized after being cooled, the pH value is regulated, and the evaporation condensed water is performed with anoxic biochemical reaction by acclimated and cultured microorganisms in a biochemical reaction system in the presence of nutrient elements. The method provided by the invention is a method combining materialization and biochemical reaction, and the method has the advantages of reasonabledesign and strong maneuverability; furthermore, the treated liquid waste can satisfy the discharge standard to be discharged or recycled.

Description

technical field [0001] The invention relates to a method for treating waste water from chemical product production, in particular to a method for treating phenol-containing waste water produced in the production process of sebacic acid by using a combination of physicochemical and biochemical methods. Background technique [0002] The domestic sebacic acid production method mainly adopts the benzene (methyl) phenol dilution method, and a large amount of phenol-containing wastewater is produced during production. The production of 1 ton of sebacic acid produces about 25 tons of phenol-containing wastewater, with a pH value of 2-3 and a phenol concentration of 4000- 5000mg / l, COD up to 20000mg / l, and about 7% to 8% sodium sulfate, which belongs to high-salt wastewater, which will cause serious harm to the environment if not treated. [0003] The treatment technologies for industrial phenolic wastewater mainly include chemical methods (chemical oxidation, photocatalytic oxidati...

AI Technical Summary

Problems solved by technology

Chinese patent application Nos. 95109421.1 and 200510038999.x all adopt the method of resin adsorption to process sebacic acid-containing phenolic wastewater, and most of the phenol can be recycled, but the COD and phenolic content of wastewater treated by this method are still high, and all the phenols in the wastewater Containing high concentrations of sodium sulfate without separation, can not meet the discharge or reuse requirements, and the regeneration and recovery of resin is more polluting

Chinese Patent Application No. 200710062541.7 also adopts extraction process to treat phenol-containing wastewater. The extraction agent used is ricinoleic acid. The extraction stage is above 8. The process is cumbersome and the effluent must be further treated.