| abstract |
The invention discloses a method for treating 2-hydroxy-3-naphthoic acid post-production wastewater, comprising the steps of: filtration, primary adsorption, secondary neutralization, primary desorption, secondary adsorption, secondary neutralization, and secondary desorption Attached, in which, the secondary neutralization of step c and the primary desorption of step d are carried out simultaneously. The present invention adopts the above-mentioned technical measures, and the chemical waste water in the production of 2-hydroxy-3-naphthoic acid is fully treated, and can be directly discharged after reaching the environmental protection standard. At the same time, 2-naphthol, 2,3 acid, 2,6 acid and other useful resources are recovered to avoid being discharged into the environment to pollute the environment, and it has great practical significance, and these resources are reused in production to reduce production costs. |