用活性污泥吸附助凝处理棉秆半化学浆废液

Improvement of Flocculation of Effluent from Cotton Stalk Semi-chemical Pulping by Using Active Sludge

用硫酸铝钾和阳离子聚丙烯酰胺对棉秆半化学浆制浆废液进行混凝处理实验,利用生物活性污泥对有机污染物的吸附作用,将好氧生物剩余活性污泥加入到棉秆半化学浆制浆废液中,可有效提高制浆废水的絮凝处理效果。对生物污泥的加入量、吸附反应时间、反应温度、反应pH值等影响因素进行了研究和优化。结果显示,CODCr去除率达到了82.5%,比不加生物污泥提高了约18个百分点,助凝效果显著。

Using active sludge to enhance the flocculation effect was studied when the effluents from cotton stalk semi-chemical pulping was treated by KAI（SO4）2 and cationic polyacrylamide. Under the condition of active sludge dosage of 0.2%, retention time 30 min, pH 8.7, temperature at 35℃, stirring speed of 150 rpm, KAl（SO4）2·12H2O dosage of 150 mg/L, PAM 10 mg/L, the COD and SS removal rates approached to 82.5% and 96.7% respectively. The active sludge shows remarkable effect on improving flocculation.