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Microplastics from Landfill Sites and Municipal Solid Waste Incinerators via Wastewater
Original title: Microplastics from Landfill Sites and Municipal Solid Waste Incinerators via Wastewater
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This Japanese-language study examined microplastic concentrations in leachate from landfill sites and wastewater from municipal solid waste incinerators in Japan. Leachate from ash-based landfills contained very low microplastic concentrations far below levels in open-dump landfills abroad, while incinerator wastewater contained up to 0.69 particles per liter before treatment. Sand filtration was shown to reduce concentrations significantly, and the authors discuss the need for surveys to estimate national discharge inventories.
本稿では，埋立処分場および，都市ごみ焼却施設からの埋立浸出水，各種焼却排水中に含まれるマイクロプラスチック (MPs) について，個数濃度や形状，組成，粒径，排水処理での除去挙動を整理した。 まず，日本における埋立浸出水原水中 MPs は，0.00023～0.00039 個/Lで，海外諸国の直接埋立処分場に比較して 1/105 程度であり，焼却残渣埋立が中心であることによると推測された。都市ごみ焼却施設においては，多岐にわたる排水の種類や処理方式について概説し，国内の 8 つの施設における調査事例を整理した。プラント排水，洗煙排水等の原水には MPs が 0.0234～0.69 個/L 含まれ，これが主に砂ろ過により，0.00667～0.00167 個/L 程度まで高度除去されていることを示した。最後に濃度情報から排出量，すなわち排出インベントリの見積りへの展開について，排水量や排出先のアンケート調査の必要性に触れた。
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