酸析—曝气微电解预处理宣纸造纸废水试验研究

Pretreatment of Papermaking Wastewater from Xuan Paper Production by Acidification and Aeration Micro-electrolysis

以安徽省泾县某宣纸厂檀皮清洗环节产生的黑液与抄浆工段白水组成的造纸废水作为处理对象，采用酸析-铁碳微电解进行预处理以削减污染负荷，提高废水的可生化性。研究结果表明，酸析、铁碳微电解两个过程均可有效去除废水中的COD和色度，酸析-微电解对宣纸造纸废水的COD、色度的总去除率分别为62．8％-73．1％和71．3％～89．1％，曝气微电解反应过程可有效提高出水的可生化性能，GC／MS检测表明铁碳微电解作用可破坏废水中某些有机物的结构，使其转化为小分子有机物，从而可改善出水的可生化性；微电解反应系统进水COD浓度小于3000mg／L时，微电解系统出水对活性污泥脱氢酶活性不产生显著的抑制作用。

The papermaking wastewater from a Xuan paper factory in Jing County, Anhui Province is consisted of the black liquor from cleaning the bark of Pteroceltis tatarinowii and white water in pulp. The combined process of acidification and ferric-carbon micro-electrolysis was used for pretreatment to reduce pollution burden and improve the biodegradability of papermaking wastewater. The results showed flaat the two processes could effectively remove COD and color, and the total removal rates of COD and color were 62.8% to 73.1% and 71.3% to 89.1% respectively. Meanwhile, the aeration micro-elec- trolysis process could be effective in improving its biodegradability. The GC/MS analysis showed that the ferric-carbon micro-electrolysis could damage the structure of some organics, making them into small mol- ecules, thus contributing to the improvement wastewater biodegradability. When the influent COD concentration was less than 5 000 mg/L, the effluent of micro-electrolysis process had no significant inhibi- tion on TTC-dehydrogenase activity.