High-phenol content wastewater treatment technology

Abstract

The invention relates to a dephenolization treatment technology of high-phenol content wastewater produced in the production of phenolic resin, which comprises the following steps: membrane separation: after a dephenolization and dealdehyding technology, the phenol-containing waste liquid is fed into a cross-flow flat membrane device for nanofiltration, and the concentrate obtained by the nanofiltration returns to the system and enters a secondary dephenolization treatment technology; and ion exchange: the filtrate obtained by the membrane separation enters a secondary series resin exchange column which performs dephenolization and dealdehyding and elution respectively for use, wherein the phenol content is controlled at a standard of 0.5ppm, 0.4ppm or 0.2ppm, and the formaldehyde content and CODcr (Chemical Oxygen Demand) are reduced to reach the requirements of the emission standard. According to the invention, phenolic resin is generated by the reaction between phenol and formaldehyde, and a large amount of aldehyde in the system is recycled; urea-formaldehyde resin is generated through the reaction between formaldehyde and urea; and moreover, by mixing urea, formaldehyde and water-soluble phenolic resin, the content of water-soluble resin and phenol in the solution is further reduced.

Description

technical field [0001] The invention relates to a dephenolization treatment process for high-phenol-containing wastewater produced in the production of phenolic resin, so that the wastewater can be discharged up to the standard. Background technique [0002] At present, the dephenolization treatment of high phenolic wastewater produced in the traditional phenolic resin production generally consists of a pretreatment part, a physical and chemical treatment part, a biochemical treatment part and an advanced treatment part. Judging from relevant materials and process practices at home and abroad, the physical and chemical treatment part has various processes, and the contents of the other three parts are roughly the same. The process used in the chemical oxidation method has H 2 o 2 Oxidation method, chlorine dioxide oxidation method, iron-carbon micro-electrolysis method, extraction method, photocatalytic oxidation method, electrocatalytic oxidation method and other processe...

AI Technical Summary

Problems solved by technology

The process used in the chemical oxidation method is H 2 o 2 Oxidation method, chlorine dioxide oxidation method, iron-carbon micro-electrolysis method, extraction method, photocatalytic oxidation method, electrocatalytic oxidation method and other processes and combined processes. Although these processes have their own strengths, they can also achieve the goal of sewage treatment. But the common main disadvantage is that energy consumption and management operations are more complicated

The iron-carbon micro-electrolysis method is a process that is widely used. Its main disadvantages are that it is easy to harden and the replacement of iron-carbon is relatively troublesome. This is what the process needs to be improved urgently.

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