Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA.
Chemosphere. 2011 May;83(9):1220-7. doi: 10.1016/j.chemosphere.2011.03.040. Epub 2011 Apr 16.
Stabilized landfill leachate is characterized by a high concentration of non-biodegradable organic matter, which is similar in chemistry to dissolved organic matter (DOM) in the natural aquatic environment. Magnetic ion exchange (MIEX) resin treatment is well-studied in drinking water for removal of DOM from natural waters. There are fewer studies evaluating MIEX treatment of waste waters, and there is no previous work evaluating MIEX treatment of landfill leachate. This work systematically evaluated MIEX treatment of stabilized landfill leachate and evaluated the results in the context of previous studies of MIEX treatment of natural and waste waters. Five leachates from four landfills were evaluated as a function of MIEX resin dose, mixing time, and regeneration efficiency. MIEX resin removed DOM from landfill leachate, even in the presence of a reported high background concentration of inorganic ions. MIEX resin that was exhausted with leachate DOM was effectively regenerated with a concentrated NaCl solution, and regenerated MIEX resin performed similarly to virgin resin. For a majority of the leachates, the removal trend for MIEX resin was color>UV-absorbing substances>dissolved organic carbon≈COD>total nitrogen. Finally, MIEX resin removed a wider range of DOM from leachate than coagulation. The most important contribution of this work is that MIEX treatment of leachate followed very similar trends as MIEX treatment of natural waters, which will allow previous MIEX data to be used to estimate the treatment efficiency of other waste waters.
稳定化垃圾渗滤液的特点是高浓度的难生物降解有机物，其化学性质类似于天然水 体中的溶解有机物 (DOM)。磁性离子交换 (MIEX) 树脂处理在饮用水中用于去除天然水中的 DOM 已有深入研究。评估 MIEX 处理废水的研究较少，且以前没有评估 MIEX 处理垃圾渗滤液的工作。本工作系统地评估了 MIEX 处理稳定化垃圾渗滤液的效果，并在 MIEX 处理天然水和废水的先前研究背景下评估了结果。评估了来自四个垃圾填埋场的五种渗滤液，考察了 MIEX 树脂剂量、混合时间和再生效率的影响。即使在报道的高背景无机离子浓度存在的情况下，MIEX 树脂仍能从垃圾渗滤液中去除 DOM。用浓缩 NaCl 溶液有效再生了耗尽渗滤液 DOM 的 MIEX 树脂，再生 MIEX 树脂的性能与新树脂相似。对于大多数渗滤液，MIEX 树脂的去除趋势为颜色>紫外吸光物质>溶解有机碳≈COD>总氮。最后，MIEX 树脂从渗滤液中去除的 DOM 范围比混凝更广。这项工作的最重要贡献是，渗滤液的 MIEX 处理与 MIEX 处理天然水遵循非常相似的趋势，这将允许使用以前的 MIEX 数据来估计其他废水的处理效率。
