RECOVERY OF VALUABLE ELEMENTS FROM SURPLUS ACTIVATED SLUDGE USING EXISTING SLUDGE TREATMENT FACILITIES
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- SHIRAIWA Takuya
- 岩手大学大学院総合科学研究科地域創生専攻
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- ITO Ayumi
- 岩手大学 理工学部システム創成工学科社会基盤・環境コース
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- ISHIKAWA Nao
- 岩手大学 理工学部システム創成工学科社会基盤・環境コース
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- KON Ikuma
- （公財）岩手県下水道公社
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- SASAKI Masayuki
- （公財）岩手県下水道公社
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- TAKADATE Naoshi
- （公財）岩手県下水道公社
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- SASAMOTO Makoto
- 岩手大学技術部
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- UMITA Teruyuki
- 岩手大学 理工学部システム創成工学科社会基盤・環境コース
Bibliographic Information
- Other Title
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- 既存の汚泥処理設備を活用した余剰汚泥からの有用元素類の回収に関する研究
- キソン ノ オデイ ショリ セツビ オ カツヨウ シタ ヨジョウ オデイ カラ ノ ユウヨウ ゲンソルイ ノ カイシュウ ニ カンスル ケンキュウ
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Abstract
Loading of Mg and P into anaerobic digester from surplus activated sludge was 3 and 4 times greater than that from raw sludge, which indicates that surplus activated sludge would be a target in reducing Mg loading into anaerobic digester. Anaerobic release of Mg, P and K from the surplus activated sludge was accelerated by the addition of thickened raw sludge and these elements in the centrifugal separate liquid was concentrated using a prototype of electrodialyzer. Furthermore, anaerobic cultivation of surplus activated sludge with thickened raw sludge in the existing storage tank during 6 hours decreased the contents of Mg, P and K in the thickened surplus activated sludge by 40 - 50%. These findings suggest that accelerated anaerobic release of the elements from surplus activated sludge could provide an opportunity to recover Mg, K and P from the separate liquid discharged from the subsequent mechanical thickener and decrease the Mg loading into the digester for inhibiting a blockage of sludge transport pipes due to struvite.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 74 (7), III_83-III_92, 2018
Japan Society of Civil Engineers