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Effect of leaching behaviour by quenching of bottom ash from MSW incineration

机译:垃圾焚烧炉底灰淬火对浸出行为的影响

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摘要

Bottom ashes (BA) obtained from a municipal solid waste incineration plant, have shown different pH and lead concentrations in leachate for different lines. In order to explain this behaviour, combustion tests were performed concerning the lines and the effect of the type of wastes. The BA obtained from the same waste has shown the same raw chemical composition, but different leachate characteristics for the different lines. The bottom ash from different wastes burned on the same line instead showed very similar leachate behaviour. The results suggest that the quality of leach ate depends on the plant and process conditions (in particular the ash quenching phase) and not on the composition of the waste. During ash quenching, the formation and dissolution of soluble alkalis depends on the washing ratio and on the residence time. A different washing degree leads to a different residual alkalinity in the bottom ash, and consequently to a different value of leachate pH with different metal releases. Therefore, with the practical aim of establishing the best conditions for the final disposal of bottom ash, a careful planning of this phase could be proposed as an alternative to a weathering process.
机译:从市政固体废物焚化厂获得的底灰(BA)对于不同的生产线显示出渗滤液中的pH和铅浓度不同。为了解释这种行为,对废物的种类和影响进行了燃烧测试。从同一废物中获得的BA表现出相同的原始化学组成,但不同生产线的浸出液特性不同。来自在同一生产线上燃烧的不同废物的底灰表现出非常相似的渗滤液行为。结果表明,浸出液的质量取决于工厂和工艺条件(尤其是灰分淬灭阶段),而不取决于废物的成分。在灰淬火过程中,可溶性碱的形成和溶解取决于洗涤比例和停留时间。不同的洗涤程度会导致底灰中残留碱度的不同,因此,随着金属释放量的不同,渗滤液的pH值也会有所不同。因此,出于为最终处置底灰建立最佳条件的实际目的,可以建议对此阶段进行仔细计划,以替代风化过程。

著录项

  • 来源
    《Waste management & research》 |2011年第10期|p.39-47|共9页
  • 作者单位

    DITAG - Land, Environment and Geo-Engineering Department, Politecnico di Torino, Torino, Italy;

    DITAG - Land, Environment and Geo-Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    municipal solid waste incinerator; bottom ash; leaching; lead; quenching;

    机译:城市固体废物焚化炉;底灰浸出铅;淬火;
  • 入库时间 2022-08-17 13:43:47

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