Performance Of Pilot-test And Full-scale Combination System Of Microbubble Catalytic Ozonation And Biological Treatment

This study takes the actual industrial refractory organic wastewater as the advanced treatment target.The microbubble catalytic ozonation-aerobic biochemical pilot plant was used to treat the pharmacy deeply,and the first case microbubble catalytic ozonation-aerobic biochemical engineering device was used to treat coal chemical wastewater deeply,its long-term continuous operation performance evaluation;analysis of the main organic pollutants in the wastewater and its removal mechanism;Investigate aerobic biochemical treatment performance and biodegradation mechanism;The performance and the laboratory-scale experimental equipment were compared with each other,which was used to investigate the impact of plant scale and wastewater source on reactor performance.The research results indicate:1)Biochemical effluent from pharmaceutical wastewater was treatment deeply in Microbubble catalytic ozonation-aerobic biochemical process,which has high performance.Coupling biochemical treatment further removes small molecule products.Under the optimal conditions,the overall COD removal rate of the pilot plant is 58.6%,and the ozone dosage/COD removal is 1.05,the average removal rate of UV₂₅₄ is 52.3%.From the perspective of the bioreactor operation effect,the fiber filter is the optimal biofilm carrier for the pilot plant bioreactor.Phenol,benzene and nitrogen-containing heterocyclic compounds are responsible for the biochemical of pharmaceutical wastewater.The effluent biodegradable substance can be increased from 0.11 to 0.34 with microbubble catalytic ozonation,which is beneficial to the subsequent aerobic biochemical treatment.2)Innovative treatment equipment for coal chemical wastewater could be operated stably and reliably.The microbubble catalytic ozonation engineering device could degrade macromolecular organic pollutants effectively and improve biodegradability,and the coupled biochemical treatment would to further remove small molecular products.Under the optimal operating conditions,the overall COD removal rate was 57.5%,ozone dosage/COD removal was 0.63,the average removal rate of UV₂₅₄ was 57.8%.The major non-degradable pollutants in the biochemical effluent of coal chemical wastewater were the polycyclic aromatic hydrocarbons and the polycyclic aromatic compounds with benzene ring or a conjugated double bond,and nitrogen-containing heterocyclic compounds.The principal functional flora and its relative abundance in aerobic biochemical treatment are greatly affected by organic pollutants and DO concentration.3)The ozone phase performance of the coal chemical wastewater engineering treatment device was better than the laboratory-scale ozone reactor.The pharmaceutical wastewater pilot plant can achieve higher pollutant removal performance overall.The low selectivity of water quality of microbubble catalytic ozonation-aerobic biochemical deep treatment process,which was suitable for advanced treatment for refractory organic industrial wastewater.