Removal of Low-Concentration Heavy Metals Using Fibrous Slag as Biocarrier and Particle Collector
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- TSUNEDA Satoshi
- Department of Chemical Engineering, Waseda University
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- SAKAI Toshiro
- Department of Chemical Engineering, Waseda University
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- HAYASHI Hiroshi
- Department of Chemical Engineering, Waseda University
Bibliographic Information
- Other Title
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- 繊維化スラグの複合的利用による低濃度重金属汚染水処理
- センイカ スラグ ノ フクゴウテキ リヨウ ニ ヨル テイノウド ジュウキンゾク オセン スイ ショリ
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Abstract
The selective removal of low-concentration heavy metal ions from heavy-metal-contaminated water was investigated using the activity or sulfate-reducing bacteria (SRB) immobilized on a fibrous slag (FS), which was employed as a both biocarrier and a fine particle collector medium. An upflow-type bioreactor composed of an FS-packed column, where SRB were immobilized at a lower part, was used. In this process, sulfate ions in the liquid are biologically reduced to sulfide ions, which react with metal ionic species to produce ultrafine metal sulfide particles. Subsequently, formed particles adhere onto the FS surface in the upper part of the reactor, thereby accumulating heavy metal ions as their sulfide precipitates. Five different organic compounds were evaluated, and as a result, lactic acid was found to serve as the most suitable electron donor for SRB in this system. In the continuous treatment of water contaminated with several heavy metal ions (Cd2+, Cu2+, Ni2+, Zn2+, and Mn2+), almost complete removal was attained over an 80-day operation period, except for Mn2+ having a relatively high solubility product constant. Heavy metal sulfide precipitates gradually accumulated on an FS bed. These experimental results indicate that the proposed bioreactor, which is the sulfate-reducing bioreactor with a fibrous slag carrier (SRB-FS), enables the efficient recovery of heavy metal ions from heavy-metal-contaminated water.
Journal
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- Journal of Japan Society on Water Environment
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Journal of Japan Society on Water Environment 28 (11), 651-655, 2005
Japan Society on Water Environment
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Keywords
Details 詳細情報について
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- CRID
- 1390282680059200512
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- NII Article ID
- 10016762665
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- NII Book ID
- AN10372439
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- COI
- 1:CAS:528:DC%2BD2MXhtlWgsrnI
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- ISSN
- 18813690
- 09168958
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- NDL BIB ID
- 7725721
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed