New method for removing volatile phenol from wastewater of pulping and papermaking with boiler fly ashes

Abstract

Belonging to a treatment method for volatile phenol in wastewater of pulping and papermaking, the invention relates to a new method for removing volatile phenol from the wastewater of pulping and papermaking with boiler fly ashes. In the invention, condensed sewage from pulping and papermaking is introduced as dedusting water into a spray tower where the condensed sewage and boiler fuel gas undergo a counter-current mass transfer. The dedusted flue gas is released into the air, and the generated ash sluicing water is introduced in order into an ash settling basin, a turbid water basin and a high turbidity water purifier for treatment and then delivered into a clean water basin which finally sends the ash sluicing water into a sewage treatment system for advanced treatment. The method of the invention can improve the removal rate of volatile phenol in the wastewater of pulping and papermaking, and simultaneously reduce the amount of acid for adjusting the pH value of the wastewater during wastewater treatment as well as reduce the amount of alkali for desulphurization while treating the boiler fuel gas. Therefore, the treatment cost of wastewater and exhaust gas generated in papermaking can be reduced.

Description

technical field [0001] The invention relates to an industrial wastewater treatment method, in particular to an industrial wastewater treatment method for removing volatile phenol in pulp and paper mill production wastewater by using boiler fly ash. Background technique [0002] The production wastewater comes from the cooking section of the pulping workshop, the evaporation section of the alkali recovery workshop, etc. Among them, the wastewater with high volatile phenol mainly comes from the alkali recovery workshop of the pulping black liquor recovery and treatment, and is concentrated in the condensed sewage of the evaporation section of the alkali recovery workshop middle. [0003] The sources of condensed sewage in the paper mill include the condensed sewage formed during the spraying of the pulping and cooking section and the condensed sewage formed by the secondary steam condensation of the alkali recovery evaporation station. Its main components are sulfides (S 2- ...

AI Technical Summary

Problems solved by technology

[0006] It is difficult for conventional sewage treatment facilities in pulp and paper mills to effectively treat volatile phenolic substances in condensed sewage, and the cost of separate treatment is high. Therefore, the removal of volatile phenolic substances in condensed sewage in domestic pulp and paper mills has always been low.

Images