Pilot-Scale Study of Pulp and Paper Wastewater Secondary Effluent by Ozonation

This paper introduces the study on treatment on the secondary biochemical effluent of pulp and paper wastewater by ozonation, and investigates the effects of the ozonation process on the wastewater COD, chroma, UV 254 and turbidity removal efficiency during ozone dosage, contact time and so on. The results showed that ozonation treatment effect was good, and with the increase of ozone dosage and contact time, the wastewater COD, chroma and UV 254 experimental conditions removal rate was increasing, and the optimum were that the ozone dosage was 126.46~147.37mg/L and contact time was 1.30~1.74h. Ozonation has a certain removal efficiency for turbidity, and turbidity removal rate was in a large range of 1.88~77.51%, but there is no obvious correlation with the ozone dosage and contact time.