Treatment method of hydroxybenzene-containing wastewater

Abstract

The invention discloses a method of treating waste water including hydroxybenzene, including following steps: (1) synchronously adopting three segments target control method, a control method of mol ratio of hydroxybenzene to aldehyde and a timely separating method of resin and waste water, and processing a condensation polymerization of waste water in an acid condition with acid catalyst to produce resin with low molecular weight; (2) removing aldehyde of the waste water after the first treatment in an alkaline condition with alkaline catalyst and then processing an neutralization and deposition treatment; (3) adopting anaerobic and aerobic treatment to process a biochemical treatment of the waste water after the second treatment to meet emission requirements. The method meets the prescribed emission requirements of the hydroxybenzene-aldehyde resin waste water or waste water containing hydroxybenzen and has a simple art, a reliable operation, a low investment and a low operation fees and adequately utilizes the hydroxybenzene-aldehyde in the waste water.

Description

Treatment method of phenolic wastewater technical field The invention relates to a method for treating phenolic wastewater, in particular to a method for treating phenolic resin wastewater and utilizing raw materials in the wastewater. Background technique In the production process of phenolic resin and modified phenolic resin, a certain amount of process wastewater needs to be discharged. The phenol content in the wastewater is as high as 30,000-80,000mg / L, the formaldehyde is as high as 10,000-30,000mg / L, COD (chemical oxygen demand) As high as 100,000-250,000mg / L, it is difficult to treat organic chemical wastewater. The existing treatment methods of phenol-containing wastewater include polycondensation method, steam stripping method, extraction method, liquid membrane separation method, chemical oxidation method, catalytic oxidation method, complex extraction method, photocatalytic method, biochemical method, etc., but for industrial There is still a lack of simple an...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that although adding urea can remove formaldehyde in wastewater, the COD value of urea and ammonia nitrogen will enter the water and increase the cost of treatment

In addition, the above method is condensed under acidic conditions with excessive formaldehyde. If no special treatment technology is adopted, the resin formed under this condition is prone to excessive crosslinking in the further polycondensation reaction of wastewater, forming insoluble and infusible resin adhesion. On the wall of the reactor, it is often necessary to clean the wall, and the amount of recyclable resin is greatly reduced, resulting in a waste of phenol and aldehyde resources in the wastewater