Aloui Fathi, Fki Firas, Loukil Slim, Sayadi Sami
Laboratoire des Bioprocédés, Pôle d'Excellence Régional AUF, Centre de Biotechnologie de Sfax, B.P. 1177, Sfax 3018, Tunisia.
Water Sci Technol. 2009;60(3):605-14. doi: 10.2166/wst.2009.377.
Landfill leachate (LFL) is a very complex wastewater that poses considerable hazards to local communities and the environment. With this concern in mind, the present study was undertaken to investigate the performance of an aerobic membrane bioreactor treating raw LFL from Djebel Chekir (Tunisia) discharge. The LFL samples collected from this site were found to be highly loaded with organic matter, ammonia, salts, greases, phenols and hydrocarbons. Important removals of chemical oxygen demand (COD) and NH4+-N were attained after 44 days of treatment at optimum conditions for the membrane and with organic loading rates (OLR) of 1.9 and 2.7 grams COD per litter and day. This treatment allowed for an important detoxification of the landfill leachates and a significant elimination of the microorganisms. Electrochemical oxidation using Pi/Ti was applied as a post-treatment and after the biological process in order to reduce the residual ammonia and COD. At a pH value of 9, current density of 4 A dm(-2) and electrolysis time of 60 minutes, COD and ammonia nitrogen were reduced to 1,000 mg L(-1) and 27 mg L(-1), respectively. COD and NH4+-N removals were accompanied by significant detoxification.
垃圾渗滤液（LFL）是一种非常复杂的废水，对当地社区和环境构成相当大的危害。出于这一担忧，本研究旨在调查一种好氧膜生物反应器处理来自杰贝勒·谢基尔（突尼斯）排放的原生垃圾渗滤液的性能。从该地点采集的垃圾渗滤液样本被发现含有高浓度的有机物、氨、盐、油脂、酚类和碳氢化合物。在膜的最佳条件下，有机负荷率（OLR）为每升每天1.9克和2.7克化学需氧量（COD），处理44天后，COD和NH4+-N得到了显著去除。这种处理使垃圾渗滤液实现了重要的解毒，并显著消除了微生物。在生物处理之后，采用Pi/Ti进行电化学氧化作为后处理，以降低残留的氨和COD。在pH值为9、电流密度为4 A dm(-2)和电解时间为60分钟的条件下，COD和氨氮分别降至1000 mg L(-1)和27 mg L(-1)。COD和NH4+-N的去除伴随着显著的解毒作用。
