Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu)

G. C. Badulis, Chiharu Tokoro, H. Sasaki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    A disadvantage of the continuous recycling process of high density (HD) sludge in the treatment of Acid Mine Drainage (AMD) from Horobetsu is the formation of ultra fine solid particles (UFP) in a low concentration. These suspended particles complicate the rapid separation. This article analyses a batch-type recycling process for the HD-sludge. Experiments were conducted with various neutralizers at pH 7 and the separation of suspended ultra fine particles was done by means of ferro-nickel slag (FS) fibers in a glass column. Different phenomena were analysed: the iron-sludge density and composition, the influence of electrocinetic surface phenomena in the generated sludge and the separation of the suspended UFP in a FS-fiber-bed. The neutralizers increase the density of the iron sludge, yet irregularly with the progression of the recycling. A MgO-based neutralizer provided the densest sludge followed by a two-step neutralizer, while Ca(OH)2 and NaOH provided the least dense sludge. The strong effect of MgO is due to the large negative minimum potential energy (Vtmin) from Fe(OH)3 as basic ferric sulphate and undissolved MgO. Also the sludge from the two-step-method has large negative Vtmin from Fe(OH)3 and undissolved CaCO3. The difference to MgO can be explained by a smaller negative Vtmin caused by heterocoagulation with other sludge materials, and by the sludge composition and concentration. The Fe(OH)3- and CaSO4-sludge from the Ca(OH)2-neutralization and the Fe(OH)3-sludge as basic ferric sulphate from the NaOH-neutralization have smaller Vtmin, resulting in low iron density. FS-fibers are very effective media to separate suspended UFP. The separation process is controlled by the Vtmin from the heterecoagulation of the UFP and the FS followed by the homocoagulation of UFP. As a result, the utilization of FS-fibers in the column bed improved the continuous-type HD-sludge recycling process.

    Original languageEnglish
    Title of host publicationProceedings - European Metallurgical Conference, EMC 2005
    Pages421-437
    Number of pages17
    Volume1
    Publication statusPublished - 2005
    EventEuropean Metallurgical Conference, EMC 2005 - Dresden
    Duration: 2005 Sep 182005 Sep 21

    Other

    OtherEuropean Metallurgical Conference, EMC 2005
    CityDresden
    Period05/9/1805/9/21

    Fingerprint

    Nickel
    Slags
    Drainage
    Recycling
    Acids
    Liquids
    Iron
    Fibers
    Surface phenomena
    Potential energy
    Chemical analysis
    Glass
    Experiments
    ferric sulfate
    Sulfates

    Keywords

    • Acid mine drainage
    • Coagulation
    • Filtration
    • High density sludge
    • Recycling
    • Solid-liquid separation
    • Waste effluent treatment

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Badulis, G. C., Tokoro, C., & Sasaki, H. (2005). Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu). In Proceedings - European Metallurgical Conference, EMC 2005 (Vol. 1, pp. 421-437)

    Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu). / Badulis, G. C.; Tokoro, Chiharu; Sasaki, H.

    Proceedings - European Metallurgical Conference, EMC 2005. Vol. 1 2005. p. 421-437.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Badulis, GC, Tokoro, C & Sasaki, H 2005, Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu). in Proceedings - European Metallurgical Conference, EMC 2005. vol. 1, pp. 421-437, European Metallurgical Conference, EMC 2005, Dresden, 05/9/18.
    Badulis GC, Tokoro C, Sasaki H. Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu). In Proceedings - European Metallurgical Conference, EMC 2005. Vol. 1. 2005. p. 421-437
    Badulis, G. C. ; Tokoro, Chiharu ; Sasaki, H. / Chemical surface mechanisms in rapid solid-liquid separation of sludge from HD-sludge recycling of AMD (Horobetsu). Proceedings - European Metallurgical Conference, EMC 2005. Vol. 1 2005. pp. 421-437
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    N2 - A disadvantage of the continuous recycling process of high density (HD) sludge in the treatment of Acid Mine Drainage (AMD) from Horobetsu is the formation of ultra fine solid particles (UFP) in a low concentration. These suspended particles complicate the rapid separation. This article analyses a batch-type recycling process for the HD-sludge. Experiments were conducted with various neutralizers at pH 7 and the separation of suspended ultra fine particles was done by means of ferro-nickel slag (FS) fibers in a glass column. Different phenomena were analysed: the iron-sludge density and composition, the influence of electrocinetic surface phenomena in the generated sludge and the separation of the suspended UFP in a FS-fiber-bed. The neutralizers increase the density of the iron sludge, yet irregularly with the progression of the recycling. A MgO-based neutralizer provided the densest sludge followed by a two-step neutralizer, while Ca(OH)2 and NaOH provided the least dense sludge. The strong effect of MgO is due to the large negative minimum potential energy (Vtmin) from Fe(OH)3 as basic ferric sulphate and undissolved MgO. Also the sludge from the two-step-method has large negative Vtmin from Fe(OH)3 and undissolved CaCO3. The difference to MgO can be explained by a smaller negative Vtmin caused by heterocoagulation with other sludge materials, and by the sludge composition and concentration. The Fe(OH)3- and CaSO4-sludge from the Ca(OH)2-neutralization and the Fe(OH)3-sludge as basic ferric sulphate from the NaOH-neutralization have smaller Vtmin, resulting in low iron density. FS-fibers are very effective media to separate suspended UFP. The separation process is controlled by the Vtmin from the heterecoagulation of the UFP and the FS followed by the homocoagulation of UFP. As a result, the utilization of FS-fibers in the column bed improved the continuous-type HD-sludge recycling process.

    AB - A disadvantage of the continuous recycling process of high density (HD) sludge in the treatment of Acid Mine Drainage (AMD) from Horobetsu is the formation of ultra fine solid particles (UFP) in a low concentration. These suspended particles complicate the rapid separation. This article analyses a batch-type recycling process for the HD-sludge. Experiments were conducted with various neutralizers at pH 7 and the separation of suspended ultra fine particles was done by means of ferro-nickel slag (FS) fibers in a glass column. Different phenomena were analysed: the iron-sludge density and composition, the influence of electrocinetic surface phenomena in the generated sludge and the separation of the suspended UFP in a FS-fiber-bed. The neutralizers increase the density of the iron sludge, yet irregularly with the progression of the recycling. A MgO-based neutralizer provided the densest sludge followed by a two-step neutralizer, while Ca(OH)2 and NaOH provided the least dense sludge. The strong effect of MgO is due to the large negative minimum potential energy (Vtmin) from Fe(OH)3 as basic ferric sulphate and undissolved MgO. Also the sludge from the two-step-method has large negative Vtmin from Fe(OH)3 and undissolved CaCO3. The difference to MgO can be explained by a smaller negative Vtmin caused by heterocoagulation with other sludge materials, and by the sludge composition and concentration. The Fe(OH)3- and CaSO4-sludge from the Ca(OH)2-neutralization and the Fe(OH)3-sludge as basic ferric sulphate from the NaOH-neutralization have smaller Vtmin, resulting in low iron density. FS-fibers are very effective media to separate suspended UFP. The separation process is controlled by the Vtmin from the heterecoagulation of the UFP and the FS followed by the homocoagulation of UFP. As a result, the utilization of FS-fibers in the column bed improved the continuous-type HD-sludge recycling process.

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    KW - Coagulation

    KW - Filtration

    KW - High density sludge

    KW - Recycling

    KW - Solid-liquid separation

    KW - Waste effluent treatment

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    BT - Proceedings - European Metallurgical Conference, EMC 2005

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