Advanced Treatment of Dry-Spun Acrylic Fiber Wastewater by O3/UV-BAF Process

The dry-spun acrylic fiber wastewater is characterized by its complicated components and high volatility of water quality. Therefore, it is typically difficult to treat. In this paper, the advanced treatment of dry acrylic plant effluent was treated by the joint process of ozone/ultraviolet-biological aerated filter (O₃/UV-BAF). The effects of ozone dosage and pH on ozone to degrade COD were discussed, and under the condition of the process running steadily, the removal effect of each unit on COD was investigated. The results showed that with the increase of ozone dosage, the increase of COD removal was generally shown as a slow first, then a fast and then a steady trend. In the ozone dosage from 52.6 to 63.2 mgL^-1, the COD removal rate reached 32.7% to 35.3%, and had the best economic feasibility. At pH 9 or so, the COD removal was the highest. The average removal of O₃/UV for COD was 32.0%, the average removal of BAF for COD was 32.6%, and the average COD concentration of effluent was 83.4 mgL^-1, met its first class discharge standard. (paper)