This study examined the lagooning treatment system of the Etueffont landfill (France) over a period of 16 years. Outflow concentrations in total suspended solids, biological oxygen demand (BOD₅) and trace metal elements largely met outflow standards and were on average of 5, 8 and 6 times lower than those observed at inflow, respectively. In 2000, however, high levels of BOD₅ were observed in both the influent and effluent, exceeding the authorized outflow limits. At that time the lagooning ponds were subjected temporarily to organic pollution, coinciding with the arrival of the first leachates from a new cell. Though the chemical oxygen demand (COD) and total organic carbon in the influent exceeded authorized limits, overall values conformed to official standards with outflow exhibiting mean concentrations four times lower than those observed at inflow. The first period took place just after the arrival from the new cell of young leachates containing a very high level of COD (>10,000 mg L⁻¹), causing an organic overload that led to a temporary dysfunctioning of the treatment installation lasting approximately two years. Additionally, the COD in the leachates fell below the strictest limits (125 mg L⁻¹) at the end of monitoring (2005–2009). The initial nitrogen load brought in by the influent decreased progressively over time, evidence of continuous degradation. At the end of monitoring, regardless of the arriving inflow load, the discharge presented stable concentrations of approximately 30 mg L⁻¹, appearing to indicate that the limits for nitrogen elimination. Total phosphorus elimination was optimal as the concentrations at outflow were minimal throughout most of monitoring, even though the phosphorus load at inflow was from two to thirty-five times greater. Thus, the findings show that landfill leachates in the methanogenic phase can be treated efficiently by lagooning without risk to the surrounding environment.

这项研究研究了16年内Etueffont垃圾填埋场（法国）的泻湖处理系统。总悬浮固体，生物需氧量（BOD ₅）和微量金属元素中的流出浓度基本满足流出标准，分别比流入时平均低5倍，8倍和6倍。然而，在2000年，高水平的生化需氧量₅在进水口和出水口均观察到超过授权的流出限制。当时，泻湖的池塘暂时受到有机污染，这恰好是来自一个新单元的第一个渗滤液的到来。尽管进水中的化学需氧量（COD）和总有机碳超过了授权限值，但总值符合官方标准，出水的平均浓度比进水时的平均浓度低四倍。第一阶段发生在刚从新的渗滤液中出来的年轻渗滤液中，该渗滤液中的COD含量非常高（> 10,000 mg L ^-1），导致有机物过载，导致治疗装置暂时失灵，持续约两年时间。此外，在监测结束时（2005-2009年），渗滤液中的COD降至最严格的限值（125 mg L ^-1）以下。进水引起的初始氮负荷随着时间的推移逐渐降低，这是连续降解的证据。在监测结束时，无论到达的流入负荷如何，放电的稳定浓度约为30 mg L ^-1，似乎表明氮消除的极限。总磷消除是最佳的，因为在整个监测过程中，流出时的浓度极小，即使流入时的磷负荷高出两倍至三十五倍。因此，研究结果表明，可以通过泻湖有效地处理甲烷化阶段的垃圾填埋场渗滤液，而不会对周围环境造成威胁。