2005年
薬剤添加による前凝集沈殿汚泥からのリン抽出および回収方法に関する研究
環境工学研究論文集
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- 巻
- 42
- 号
- 開始ページ
- 335
- 終了ページ
- 345
- 記述言語
- 日本語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.11532/proes1992.42.335
- 出版者・発行元
- Japan Society of Civil Engineers
As a technique of disposing and recycling a large amount of sludge generated by the pre-coagulation process, which is literally one of the advanced sewage disposal system, we focused on the method of recovering phosphate and coagulant in sludge. Characteristics of extraction and recovery of phosphate were particularly examined in this process, where iron and phosphate were separated by the addition of chemical compounds. Targeting the pre-coagulated sludge with Ferric Chloride, we evaluated these following points; 1) the influence of S/Fe molar ratio and pH on the phosphorus extraction rate, 2) the influence of the amount of added calcium hydroxide on the extracted phosphate recovery rate, and 3) the composition of the material recovered.<BR>As a result, when using potassium hydrosulfide in minimum addition amount (S/Fe=1-1.5) as its reducing agent, maximum extraction rate of around 70% was obtained, which is effectively higher than the result when hydrogen sulfide was used before. Moreover, the extracted phosphate recovery rate hit 90% when Ca/P molar ratio was about 1.5. As for the material recovered, 15% of phosphorus was contained with quite low content of heavy metals and Al.
- リンク情報
- ID情報
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- DOI : 10.11532/proes1992.42.335
- ISSN : 1341-5115
- CiNii Articles ID : 130003949459