凝集沈殿による下水中のリン回収とリン含有凝集沈殿汚泥の植物根分泌酵素・有機酸による可溶化

DOI

書誌事項

タイトル別名
  • Recovery of phosphorus from municipal wastewater by coagulation and the dissolution of the coagulated phosphorus by enzyme and organic acid secreted from plant roots.

抄録

The most important nutrient elements required for food production by crops are nitrogen, phosphorus and potassium. Among these elements, however, amount of rock phosphorus remained in the world is limited. Therefore, it is important to develop the technology and construct the social system for recycling use of phosphorus. Municipal wastewater contains phosphorus of 5-10 mg/l as the suspended and soluble forms. This paper deals with the separation of phosphorus from municipal wastewater by the coagulation/flocculation/sedimentation process using a jet mixed separtor (JMS) which is a simple but effective solid-liquid separtor. A new coagulant, Poly Silicato Iron (PSI), was used together with polyaluminum chloride and FeCl3. The PSI has a molar ratio of Fe to Si with 1: 1 to 1: 5 anda molecular weight of 200, 000 to 500, 000 Da. The JMS removed about 80% phosphorus with the addition of 5 mg Al or Fe/l. Classification of phosphorus forms in the coagulated sludge was carried out, and the effectiveness of the acid phosphatase and citric acid secreted from the plant roots for releasing orthophosphate from the organic and inorganic phosphorus compounds contained in the sludge was examined. It was shown that the inorganic phosphorus coagulated by FeCl3, and organic phosphorus in the sludge released orthophosphates by the acid phosphatase.

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390001204112447104
  • NII論文ID
    130003949170
  • DOI
    10.11532/proes1992.36.121
  • ISSN
    1884829X
    13415115
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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