Study on the Treatment of Wastewater from Bio-CMP Process of Poplar Heartwood by Flocculation Combined with Biological Aeration Filter
In this study,poplar heart-wood were pretreated with the white-rot fungus Trametes sp.48424.The integrated wastewater generat-ed during chemical-mechanical pulping was treated by combining flocculation and precipitation with a biological aeration filter(BAF),to study the effect of wastewater reuse on biochemical-mechanical pulping and BAF,and to explore the feasibility of reuse of treated wastewater.The results showed that the use of white-rot fungus pretreatment technology could offset the CODCr produced by adding NaOH of 2％(relative to raw material oven dry weight).The maximum removal rate of CODCr after treatment was 49.9％.the maximum removal rate of CODCr treated by BAF was up to 91.8％.The effluent CODCr was reduced to 39.8 mg/L,which met the standards for reuse and discharge of pulping wastewa-ter.Wastewater reuse would reduce the overall efficiency of the BAF,and the treated wastewater was reused in the pulping system,which would also result in a certain impact on the paper performance.After reuse once,the effluent CODCr rised to 76.3 mg/L,so the treated waste-water could only be reused once.
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