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The use of O3 advanced oxidation processes for landfill leachate pretreatment.

机译：使用O3高级氧化工艺对垃圾渗滤液进行预处理。

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摘要

The final discharge point for collected landfill leachates is frequently the local municipal wastewater treatment facility. The salinity, color, and/or nutrient and organics contamination of leachates often necessitate some form of pre-treatment. When advanced oxidation processes (AOPs) are considered for pre-treatment, the unique composition of dissolved organic matter (DOM) and the relatively high concentrations of some inorganic solutes in leachate will inhibit treatment efficiency. The most important benchmark for design of AOPs is the expected steady-state production of free radical (·OH). Without a quantitative assessment of total ·OH consumption in high-strength waste water, like a landfill leachate, efficient AOP treatment is uncertain. For this reason, two landfill leachates, distinct in color, DOM, population served by municipal solid waste facility, and age of landfill, were characterized for ·OH-scavenging using a well-established competition kinetics method. After stripping the samples of inorganic carbon, the DOM in leachate from mature (stabilized) landfill was found to react with ·OH at a rate of 9.76 x 108 M-1s -1. However, DOM in leachate from newer landfill was observed to scavenge available ·OH at a faster rate (8.28 x 109 M-1s-1). The combination of fast rate of reaction with ·OH and abundance of DOM in the sampled leachate severely limited the contribution of ·OH to degradation of an O3- and ·OH-labile organic probe compound (bisphenol-a) in the ozonated mature leachate (f·OH = 0.03). Substantial dosing of both O3 and H2O2 (> 70 mg/L and >24 mg/L, respectively) may be required to see at least 1-log-removal (>90%) of an ·OH-selective leachate contaminant (parachlorobenzoic acid) in a mature landfill leachate.
机译：收集的垃圾填埋场渗滤液的最终排放点通常是当地的市政废水处理设施。渗滤液的盐度，颜色和/或营养物和有机物的污染通常需要某种形式的预处理。当考虑采用高级氧化工艺（AOP）进行预处理时，溶解有机物（DOM）的独特组成以及沥滤液中某些无机溶质的相对较高浓度将抑制处理效率。设计AOP的最重要基准是自由基（·OH）的预期稳态产生。如果没有对高强度废水（如垃圾渗滤液）中总·OH消耗量进行定量评估，就无法确定有效的AOP处理方法。因此，使用成熟的竞争动力学方法对两种填埋场渗滤液进行了•OH清除的表征，这些渗滤液的颜色，DOM，城市固体废物设施服务的人口以及垃圾填埋场的年龄均不同。剥离无机碳样品后，发现成熟（稳定）垃圾填埋场渗滤液中的DOM与？OH反应的速率为9.76 x 108 M-1s -1。但是，观察到来自较新的垃圾填埋场的渗滤液中的DOM以更快的速率（8.28 x 109 M-1s-1）清除了可用的·OH。与·OH的快速反应速率和采样渗滤液中DOM的大量存在的结合严重限制了·OH对臭氧化的成熟渗滤液中O3-和·OH不稳定的有机探针化合物（双酚a）降解的贡献（ f·OH ＝ 0.03）。可能需要大量投加O3和H2O2（分别> 70 mg / L和> 24 mg / L），以观察到至少-1-log去除（> 90％）的·OH选择性浸出液污染物（对氯苯甲酸） ）在成熟的垃圾渗滤液中。

著录项

  • 作者

    Mirsaeid Ghazi, Niloufar.;

  • 作者单位

    The Florida State University.;

  • 授予单位 The Florida State University.;
  • 学科 Engineering Civil.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2013
  • 页码 68 p.
  • 总页数 68
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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