Influencing factors of high-concentration organic wastewater treatment by O3/UV using granular activated carbon (GAC) as the catalyst
臭氧/活性炭/紫外光联用处理几种高浓度有机废水影响因素

Ozonation combined with UVirradiation(O3/UV)using granular activated carbon(GAC)as the catalyst was investigated as a pretreatment method for high-concentration organic wastewater.The effect of operating parameters such as ozone dosage,pH value and UV light irradiation;and the effectiveness of the process to remove COD and to increase biodegradation capacity(BOD5/COD ratio)was also examined under the optimum conditions.The results showed that the COD removal efficiency of paranitrobenzoic acid wastewater by ozonation using GAC as the catalyst was much higher than either ozonation or GAC catalytic treatment alone.The removal efficiencies of long chain aromatic organics in wastewater,such as paranitrobenzoic acid and guanine,were much better than those of short chain organics,such as acetaldehyde and ethanolamine.It was also found that COD removal increased with increasing pH values in neutral and alkaline solutions while excessive alkalinity weakened CODremoval.ApHvalue of 9.0 was most suitable.The CODremoval of paranitrobenzoic acid wastewater by the O3/GAC/UV process was 52%,and the BOD5/COD ratio increased from 0.10 to 0.32,indicating that the biodegradation capacity was greatly improved.