吸附——生物降解组合水处理过程的研究

A STUDY ON ADSORPTION AND BIODEGRADATION COMBINED PROCESS FOR WATER TREATMENT

本文通过四种不同生物降解性和吸附性的典型污染物,即苯酚、乙二醇、己内酰胺和对氨基苯磺酸,以及焦化厂废水的COD降解速率,讨论了吸附——生物降解组合水处理过程中吸附和生物降解之间的协同效应。对于缓慢降解而又具有一定吸附性的污染物,如乙二醇和己内酰胺,这种协同效应是明显的;生物降解性高的污染物如苯酚,或吸附性差的污染物如氨基苯磺酸,则不显示协同效应。与常规活性污泥法相比,在添加200毫克每升活性炭的条件下,吸附——生物降解组合水处理过程使焦化厂废水的COD脱除率从50％提高到80％,同时,运行的稳定性也有明显的改善。影响该组合过程的主要操作因素是活性炭添加量和SRT。添加粘土以代着活性炭也可以提高COD的脱除率,但是,运行特性未获改善。

A synergistic effect of adsorption and biodegradation in combination on four typical pollutants with different biodegradability and adsorptivity, i.e., phenol, ethylene glycol, caprolactam and paraaminosulfonic acid, and coke plant wastewater was evaluated by COD degradion rate. Slowly degradable and adsorbable pollutants such as caprolactam and ethylene glycol did exist the synergistic effect, but no synergistic effect has shown for pollutants of high biodegra-dability (e.g., phenol) or poor adsorptivity (e. g., para-aminosulfonic acid). With a activated carbon does of 200 mg/l, COD remoal from the coke plant wastewater increased foom 50% to 80%, and a amore stable performance was achieved, as compared with conventional activated sludge process, the major factors affecting the carbon addition effect being carbon dose and SRT.