曝气生物滤池处理高含盐乙烯废碱液的试验研究

EXPERIMENTAL STUDY ON THE TREATMENT OF SALINE ETHYLENE WASTEWATER BY BIOLOGICAL AERATED FILTER

高浓度盐分会对微生物产生抑制,传统生物难以处理高含盐有机废水。尝试利用曝气生物滤池对经过湿式氧化处理后的乙烯废碱液进行处理,通过驯化污泥,对系统的耐盐性能进行试验。试验结果表明:在试验温度20～25℃,水力停留时间9 h的条件下,当废碱液含盐量低于6%时,COD去除率稳定在85%左右;当含盐量达到8%时,微生物活性受到影响,但仍可获得较高的处理效率,COD去除率保持在75%以上。

High-concentration salt has an inhibitory effect on microorganisms, and it is of great difficulty to treat high salinity organic wastewater with traditional biological method. In this paper, saline exhausted lye from an ethylene plant was treated by use of biological aerated filter, and a salt-tolerance test of the treatment system was carried out on the basis of proper sludge acclimation. The results shows that, under the conditions that temperature is 20～25℃ and hydraulic retention time is 9h, when the salt concentration is less than 6%, COD removal rate can stablize at 85%. When the salt concentration reaches 8%, microbial activity is restrained but still with a high COD removal rate, which maintains above 75%.