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首页> 外文期刊>Environmental Science & Technology >Heavy Metal Removal from Sewage Sludge Ash by Thermochemical Treatment with Polyvinylchloride
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Heavy Metal Removal from Sewage Sludge Ash by Thermochemical Treatment with Polyvinylchloride

机译：聚氯乙烯热化学处理去除污泥中的重金属

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摘要

Sewage sludge ash (SSA) is a prospective phosphorus source for the future production of recycling P-fertilizers. Due to its high heavy metals contents and the relatively low P plant-availability, SSA must be treated before agricultural utilisation. In this paper SSA was thermochemically treated with PVC in a bench-scale rotary furnace in order to remove heavy metals via the chloride pathway. PVC has a high Cl-content of 52-53% and a high heating value that can be beneficially used for the thermochemical process. Large amounts of waste PVC are already recovered in recycling processes, but there are still some fractions that would be available for the proposed thermochemical process, for example, the low quality near-infrared (NIR)-fraction from waste separation facilities. Heavy metals were effectively removed at temperatures in the range of 800-950℃ via the gas phase by utilisation of PVC as Cl-donor. The resulting P plant-availability was comparable to SSA thermochemically treated with MgCl_2 as Cl-donor if MgO was used as an additive (Mg-donor). A further increase of the plant availability of phosphorus was achieved by acid post-treatment of the thermochemically treated SSA
机译：污水污泥灰（SSA）是未来生产回收P型肥料的潜在磷源。由于其重金属含量高且磷植物的利用率相对较低，因此必须在农业利用之前对SSA进行处理。在本文中，SSA在台式旋转炉中用PVC进行了化学处理，以通过氯化物途径去除重金属。 PVC具有52-53％的高Cl含量和高的热值，可有利地用于热化学过程。大量的废PVC已在回收过程中被回收，但是建议的热化学工艺仍可以使用一些馏分，例如，来自废料分离设施的低质量的近红外（NIR）馏分。通过使用PVC作为Cl供体，在800-950℃的温度范围内通过气相有效地去除了重金属。如果将MgO用作添加剂（Mg供体），则所得的P植物利用率可与用MgCl_2作为Cl供体进行热化学处理的SSA相当。通过对经过热化学处理的SSA进行酸后处理，可进一步提高磷的植物利用率

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|563-567|共5页
  • 作者

    Christian Vogel; Robert M. Emer; Christian Adam;

  • 作者单位

    BAM Federal Institute for Materials Research and Testing, Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Unter den Eichen 87, D-12205 Berlin, Germany,School of Chemistry, Monash University, Wellington Road, 3800 VIC Clayton, Australia;

    BAM Federal Institute for Materials Research and Testing, Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Unter den Eichen 87, D-12205 Berlin, Germany,Institute for Technical Ecology, Technical University of Berlin, Strasse des 17. Juni 135, D-10623 Berlin, Germany;

    BAM Federal Institute for Materials Research and Testing, Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Unter den Eichen 87, D-12205 Berlin, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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