塩化第二鉄を用いた凝集沈殿汚泥の性状がリンおよび凝集剤回収プロセスに与える影響

DOI

書誌事項

タイトル別名
  • Influence of the Coagulated Sludge Characteristics with Ferric Chloride on the Phosphate and Coagulant Recovery Process

抄録

Removal of phosphate in wastewater is very important because it causes the eutrophication of the lake or pond. On the other hand, phosphate recovery from sewage and sludge treatment systems is particularly important because it is a limited resource and a large proportion of the phosphate currently used in Japan must be imported. Therefore, we have been experimentally evaluating phosphate and coagulant recovery methods from pre-coagulated sludge with NaHS.<BR>In this study, we experimentally investigated the influence of the coagulated sludge characteristics with ferric chloride on its phosphate and coagulant recovery process. The phosphate extraction and recovery from pre-coagulated sludge with various amount of FeCl3, the iron dissolution using HCl and the oxidation with H2O2 experiments were conducted.<BR>As the result of phosphorus extraction experiment, we found that the increase of FeCl3 dose led to high phosphorus extraction ratio because of the increase of FePO4 in sludge and not extracted phosphorus could exist with Al, Ca and organic matter. In phosphorus recovery experiment, we could obtain good recovered materials which contained 15% of phosphorus and little heavy metals. And as the result of coagulant recovery experiment, recovered coagulant is as effective as commercial FeCl3.

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詳細情報 詳細情報について

  • CRID
    1390001204111166336
  • NII論文ID
    130003949490
  • DOI
    10.11532/proes1992.43.399
  • 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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