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Utilization of municipal waste combustor (MWC) ash in landfills to remove lead in leachate.

机译：利用垃圾掩埋场中的市政垃圾燃烧器灰分去除渗滤液中的铅。

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Municipal waste combustor (MWC) ash was studied to determine its applicability as daily cover material in landfills. In the landfill operation, conventional daily cover material is costly and MWC ash requires space for disposal. It is therefore important to study the use of MWC ash as daily cover material.; The study was conducted to determine (1) concentrations of selected heavy metals in leachate using Toxicity Characteristic Leaching Procedure (TCLP) and Synthetic Precipitation Leaching Procedure (SPLP), (2) leaching potential of lead (Pb) in combined ash by using Sequential Extraction (SE) Leaching Test in combined ash, and (3) the potential to remove lead (Pb) from landfill leachate by using combined ash as daily cover.; Results of TCLP and SPLP studies revealed that concentrations of arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), selenium (Se), and silver (Ag) in ash leachates were either below EPA standards or not detectable. Since combined ash is not characterized as hazardous according to TCLP and SPLP results, it can be disposed of in solid waste landfills under Subtitle D, Section 3001 (I) of Resource Conservation and Recovery Act (RCRA). The SE Leaching Test revealed that potential leaching of Pb from ash matrix under field conditions or in natural conditions was in mineral fractions such as exchangeable ions and bound to-carbonates. These Pb concentrations in leachates were below EPA standards. The Pb removal studies indicated that using MWC combined ash as landfill daily cover had potential to remove dissolved Pb when the ash thickness was 7.62 cm, 15.23 cm, and 22.86 cm and lead concentration was less than 1,000 μg/1.; In conclusion, base on EPA part 258.21, criteria for municipal solid waste landfills cover material requirement, the MWC combined ash can be used as daily cover material for disposed solid waste with six inches in thickness. Also MWC combined ash had potential to remove dissolved Pb from landfill leachate. However, solidification of the ash matrix after contacting with water will minimize percolation of landfill leachate through compacted ash and required further studies.
机译：对城市垃圾燃烧器（MWC）灰进行了研究，以确定其作为垃圾掩埋场的日常覆盖材料的适用性。在垃圾掩埋场操作中，常规的日常覆盖材料成本高昂，而MWC灰烬需要处理空间。因此，重要的是研究使用MWC灰作为日常覆盖材料。进行了这项研究，以确定（1）使用毒性特征浸出程序（TCLP）和合成沉淀浸出程序（SPLP）确定浸出液中所选重金属的浓度，（2）通过顺序萃取在混合灰分中铅（Pb）的浸出潜力（SE）混合灰分的浸出试验，以及（3）通过使用混合灰分作为日常掩埋物从垃圾渗滤液中去除铅（Pb）的潜力; TCLP和SPLP研究的结果表明，灰分浸出液中砷（As），镉（Cd），铬（Cr），铅（Pb），硒（Se）和银（Ag）的浓度低于或低于EPA标准可检测的。由于根据TCLP和SPLP结果，混合灰渣没有被归类为有害灰烬，因此可以根据资源保护和回收法（RCRA）第D字幕第3001（I）节的规定将其处理在固体垃圾填埋场中。 SE浸出试验表明，在田间条件或自然条件下，铅可能从灰分基质中浸出，存在于矿物级分中，例如可交换离子和与碳酸盐结合。渗滤液中的这些铅浓度低于EPA标准。去除铅的研究表明，当灰分厚度分别为7.62 cm，15.23 cm和22.86 cm并且铅浓度小于1,000μg/ 1时，使用MWC结合灰作为垃圾掩埋场的日覆盖物具有去除溶解的Pb的潜力。总之，根据EPA第258.21部分，城市生活垃圾填埋场覆盖材料要求的标准，MWC混合灰可用作日常处理厚度为6英寸的固体废弃物的覆盖材料。此外，MWC组合灰分还具有从垃圾渗滤液中去除溶解的铅的潜力。然而，与水接触后灰分基质的固化将通过压实灰分将垃圾渗滤液的渗透最小化，需要进一步研究。

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