Process for treating tar product wastewater

Abstract

The invention discloses a process for treating tar product wastewater, which can improve the ratio of BOD / COD of the wastewater, reduce the concentration of ammonia thereof and the concentration of volatile phenol, and further lead the wastewater to be recycled or discharged without pollution. The process for treating the tar product wastewater is characterized in that: a. the wastewater which is generated by cleaning is conducted into a primary settling tank to be settled so as to remove the settled impurities; b. the wastewater is conducted into a wastewater circulating pool so as to remove big granular matters, partial suspended matters and partial oil, and reduce the content of COD; c. the wastewater is conducted into a coagulating air floating machine so as to remove the oil, slag, ammonia and nitrogen; d. the wastewater is conducted into an intermediate settling tank to settle the impurities of the coagulating air floating tank and simultaneously regulate the water quality; e. the wastewater is conducted into a hydrolytic acidification tank and the function of an anaerobe is utilized so as to degrade the refractory organic matters with big particles and molecules into biodegradable organic matters with small molecules; f. the wastewater is conducted into a contact oxidation tank, and under the contact oxidation action of aerobic bacteria, through aeration, the organic matters in the wastewater are absorbed and degraded by the aerobic bacteria; and g. the wastewater is recycled or discharged after reaching the standards after being settled by the inclined settling tank and treated by the post-treatment process.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a process for treating tar product wastewater. Background technique [0002] After the tar-containing flue gas of the biomass gasification furnace is washed through the water washing spray tower and the Venturi tank, the cleaned wastewater is discharged directly without special treatment. The ratio of BOD / COD in the discharged wastewater is very low, indicating that the The biodegradability of wastewater is very poor; and the concentration of ammonia is high, which will inhibit the activity of microorganisms; the concentration of volatile phenol is high, which is toxic to microorganisms. In summary, the discharge of tar product wastewater has polluted the environment. Contents of the invention [0003] In view of the above problems, the present invention provides a process for treating tar product wastewater, which can increase the ratio of BOD / COD of wastewater, ...

AI Technical Summary

Problems solved by technology

[0002] After the tar-containing flue gas of the biomass gasification furnace is washed through the water washing spray tower and the Venturi tank, the cleaned wastewater is discharged directly without special treatment. The ratio of BOD / COD in the discharged wastewater is very low, indicating that the The biodegradability of wastewater is very poor; and the concentration of ammonia is high, which will inhibit the activity of microorganisms; the concentration of volatile phenol is high, which is toxic to microorganisms

In summary, the discharge of its tar product wastewater has polluted the environment