厌氧共代谢处理晚期垃圾渗滤液中难降解有机物的研究

Study on Anaerobic Co-metabolism for Treatment of Refractory Organic Matter in Late Landfill Leachate

选取葡萄糖、淀粉和草酸作为共代谢基质,采用厌氧培养方式进行一系列静态批次实验,研究不同共代谢基质和不同投加量对晚期垃圾渗滤液中难降解有机物的降解影响。结果表明:葡萄糖、淀粉和草酸对晚期垃圾渗滤液中难降解有机物的降解均有促进作用。草酸、葡萄糖和淀粉最佳的投加量分别为50、10和10 mg/L,最佳的投加量下难降解COD去除率分别为43.00%、37.80%和32.60%。不同基质条件下的难降解有机物的降解过程均符合一级动力学规律,最佳的投加量下反应速率顺序为:K草酸>K葡萄糖>K淀粉>K空白。三维荧光光谱分析表明添加共代谢基质促进了类富里酸的降解,而对类胡敏酸的降解没有显著效果,出水中腐殖质的腐殖化程升高。红外光谱分析表明经厌氧共代谢作用后,晚期垃圾渗滤液中酰胺、苯环相关的官能团减少,而与有机羧酸类相关的官能团增多。

Glucose, starch and oxalic acid were selected as the co-metabolism matrix, and a series of static batch experiments were carried out by anaerobic culture. The effects of different co-metabolism substrates and different dosage on the degradation of the refractory organic compounds in the late landfill leachate were studied.The results showed thatoxalic acid,glucoseand starch promoted the degradation of refractory organic matter in late landfill leachate. The optimum dosage of oxalic acid, glucoseand starch were 50 mg/L, 10 mg/Land 10 mg/L, respectively, and the removal efficiency of the hard degradation COD under the optimum dosage was 43.00%, 37.80% and 32.60% respectively.The degradation processofrefractory organic compounds under the different substrate conditions was in accordance with the first order kinetics, and the order of the reaction rate under the optimum dosage wasK(oxalic acid)> K(glucose)> K(starch)> K(blank).Three-dimensional fluorescencespectroscopy analysis showed that the addition of co-metabolic matrix promoted the degradation of fulvic acid-like substances, but had no significant effect on the degradation of humic acid-like substances,and the humification degree of effluent increased. Infrared spectroscopy analysis showed that amide and phenylcycline related functional groups decreased, while organic carboxylic acid related functional groups increased after anaerobic co-metabolism.