Stabilization of Lead Compounds in Fly Ash by Using Waste Plastic as a Sulfuration/Solidification Matrix

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  • Sawada Kayo
    Department of Energy Engineering and Science, Nagoya University
  • K Shingo
    Department of Energy Engineering and Science, Nagoya University
  • Matsuda Hitoki
    Research Center for Advanced Waste and Emission Management, Nagoya University

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Other Title
  • 廃プラスチックを硫化物化媒体／固化材とした飛灰中鉛化合物の固定化
  • 安全,環境,エネルギー 廃プラスチックを硫化物化媒体/固化材とした飛灰中鉛化合物の固定化
  • アンゼン カンキョウ エネルギー ハイプラスチック オ リュウカブツカ バイタイ コカザイ ト シタ ヒカイ チュウ ナマリ カゴウブツ ノ コテイカ

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Abstract

To immobilize lead compounds in fly ash from a melting process of MSW incineration fly ash, fly ash was mixed with waste plastic, sulfur and calcium hydroxide in a bi-axial kneader at 523 K. The waste plastic samples used were: polyethylene (PE), polypropylene (PP) and polystyrene (PS). The physical immobility of treated fly ash with plastics and the applicability of plastics to sulfurating medium were examined by using a dissolution test.<br>As a result, lead concentration in the eluant decreased with an increase in the amount of plastic added. However, Japan's lead emission standard of 0.3 mg/l was not achieved by this treatment. On the other hand, there was no detectable lead in the eluant from fly ash mixed with plastic (2.5 g/10 g-fly ash), sulfur (1.2–1.4 g/10 g-fly ash) and calcium hydroxide (1.0–1.4 g/10 g-fly ash), confirming the complete insolubilization of lead compounds in fly ash.

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