An example of wastewater treatment project for chemical APIs and pharmaceutical intermediates
Wastewater from a pharmaceutical enterprise contains various kinds of pollutants with different concentrations,which exhibits poor biodegradability,according to the above characteristics,classification process was adopted.Using workshop pretreatment-zero valent iron(ZVI)reduction+oxidation process to treat high con-centration wastewater,the effluent water was mixed with low concentration wastewater,and the mixture was then be treated by combined process of air flotation-hydrolytic acidification-high efficiency dual cycle(HIC)anaero-bic tower-two stage AO-MBR-fludized bed Fenton(FBR)oxidation tower.Under the condition that the mass concentrations of CODCr,ammonia nitrogen,total nitrogen in the mixed wastewater were 5 430,222,371 mg/L re-spectively,the corresponding indexes in the effluent water were 240,21 and 45 mg/L respectively,the removal rates were 95.6％,90.5％and 87.9％respectively,which complied with the emission standard of the industrial park.
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