Catalytic ozonation of high saline petrochemical wastewater using PAC@FeIIFe2IIIO4: Optimization, mechanisms and biodegradability studies

摘要: Abstract This work specially focused on preparation of a magnetic catalyst, carbon impregnated by iron oxide (PAC@Fe3O4), and consider its catalytic ability for the first time in ozonation high saline petrochemical wastewater (PCW) from PVC VCM manufacturing industries. The structural surface properties effect operational factors, biodegradability mechanisms were also studied details. Results revealed that influence pH COD removal rate was negligible, whereas process performance significantly affected various concentrations catalyst ozone. Under optimum conditions, TOC reached to 75.3 50.3% after 120 min ozonation, respectively. Organic compounds degraded through transformation ozone into OH both over solution as identified tert-butanol. A probable comprehensive mechanism include adsorption, homogeneous heterogeneous proposed. PCW noticeably improved based BOD5/COD ratio, AOS COS indices reaction PAC@Fe3O4/O3 system. indicated weak leaching activity upon five recycling cycles, which confirms it can be reused many times. Therefore, an effective promising technique successful treatment, due efficient reduction COD, achieve discharge standards enhance biodegradability.