Characteristics of Pulp Mill Effluents and Activated Sludge Process

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  • パルプ工場排水の特徴と活性汚泥による処理について
  • パルプ コウジョウ ハイスイ ノ トクチョウ ト カッセイ オデイ ニ ヨル ショリ ニ ツイテ

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<p>In pulp and paper mills, flocculent settling process, a kind of physicochemical process, and activated sludge（AS）process, a kind of biological process, have been used for wastewater treatment. The former is to remove SS by flocculation with chemicals, and the latter is to decompose dissolved organic matter by aerobic bacteria.</p><p>Wastewater in the pulp and paper mill is classified to wastewater from KP plant, wastewater from DIP plant and wastewater from paper machine, each of which contains various organic matters. The former two, pulp mill effluents, are treated with AS process in most cases.</p><p>In order to evaluate characteristics of pulp mill effluents, dissolved organic matter in wastewater from each pulp plant was fractionated into five components：hydrophobic acid（HoA），hydrophobic neutral, base, hydrophilic acid, hydrophilic neutral. Based on measurements of the degradation rates of the fractionated components, it was confirmed that the most refractory matter was fractionated into HoA. The main source of HoA was KP bleaching process drainage, and a major composition of HoA seemed to be lignin.</p><p>Degradability of wastewater was affected by not only characteristics of wastewater but also performance of AS. Biodegradation test with combination of wastewater and AS indicated that AS samples of some mills had different ability for degradation. And, Genetic analysis suggested that high performance AS had much bacteria preferring aromatic compounds which were hardly degradable.</p>

Journal

  • JAPAN TAPPI JOURNAL

    JAPAN TAPPI JOURNAL 72 (8), 902-906, 2018

    JAPAN TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY

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