Characterization and dewatering of activated sludge from the pulp and paper industry

Jaakko Pere, Raimo Alen, Liisa Viikari, Leif Eriksson

    Research output: Contribution to journalArticleScientificpeer-review

    58 Citations (Scopus)

    Abstract

    Floc properties and dewatering of activated sludge from the pulp and paper industry were studied prior to and after an oxidative conditioning using Fenton's reagent Sludge samples were taken from four treatment plants, which differed with respect to organic loadings and wastewater source. Poor dewaterability was typical of heavily loaded sludges and a positive correlation between filtrability and the concentration of exopolysaccharides was observed. Oxidative conditioning improved the dewaterability of all the sludges tested, but especially that of heavily loaded sludges. Lab-scale piston press results were also comparable with those of controls conditioned with polyelectrolytes. As a result of the conditioning, the surface charge density of the flocs decreased and the contact angles of filter cakes were increased, which enhanced flocculation and settleability. It is possible that hydroxyl groups are oxidized during the oxidative treatment to carboxyl groups, which are more hydrophobic at low pH. This hypothesis was partly supported by FTIR-analysis, but obviously other mechanisms were also involved.

    Original languageEnglish
    Pages (from-to)193 - 201
    Number of pages9
    JournalWater Science and Technology
    Volume28
    Issue number1
    DOIs
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    pulp and paper industry
    Paper and pulp industry
    Dewatering
    Flocculation
    Surface charge
    Charge density
    dewatering
    Polyelectrolytes
    Pistons
    Contact angle
    activated sludge
    Wastewater
    sludge
    conditioning
    flocculation
    wastewater

    Cite this

    Pere, Jaakko ; Alen, Raimo ; Viikari, Liisa ; Eriksson, Leif. / Characterization and dewatering of activated sludge from the pulp and paper industry. In: Water Science and Technology. 1993 ; Vol. 28, No. 1. pp. 193 - 201.
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    title = "Characterization and dewatering of activated sludge from the pulp and paper industry",
    abstract = "Floc properties and dewatering of activated sludge from the pulp and paper industry were studied prior to and after an oxidative conditioning using Fenton's reagent Sludge samples were taken from four treatment plants, which differed with respect to organic loadings and wastewater source. Poor dewaterability was typical of heavily loaded sludges and a positive correlation between filtrability and the concentration of exopolysaccharides was observed. Oxidative conditioning improved the dewaterability of all the sludges tested, but especially that of heavily loaded sludges. Lab-scale piston press results were also comparable with those of controls conditioned with polyelectrolytes. As a result of the conditioning, the surface charge density of the flocs decreased and the contact angles of filter cakes were increased, which enhanced flocculation and settleability. It is possible that hydroxyl groups are oxidized during the oxidative treatment to carboxyl groups, which are more hydrophobic at low pH. This hypothesis was partly supported by FTIR-analysis, but obviously other mechanisms were also involved.",
    author = "Jaakko Pere and Raimo Alen and Liisa Viikari and Leif Eriksson",
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    Characterization and dewatering of activated sludge from the pulp and paper industry. / Pere, Jaakko; Alen, Raimo; Viikari, Liisa; Eriksson, Leif.

    In: Water Science and Technology, Vol. 28, No. 1, 1993, p. 193 - 201.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Characterization and dewatering of activated sludge from the pulp and paper industry

    AU - Pere, Jaakko

    AU - Alen, Raimo

    AU - Viikari, Liisa

    AU - Eriksson, Leif

    N1 - Project code: POV9009

    PY - 1993

    Y1 - 1993

    N2 - Floc properties and dewatering of activated sludge from the pulp and paper industry were studied prior to and after an oxidative conditioning using Fenton's reagent Sludge samples were taken from four treatment plants, which differed with respect to organic loadings and wastewater source. Poor dewaterability was typical of heavily loaded sludges and a positive correlation between filtrability and the concentration of exopolysaccharides was observed. Oxidative conditioning improved the dewaterability of all the sludges tested, but especially that of heavily loaded sludges. Lab-scale piston press results were also comparable with those of controls conditioned with polyelectrolytes. As a result of the conditioning, the surface charge density of the flocs decreased and the contact angles of filter cakes were increased, which enhanced flocculation and settleability. It is possible that hydroxyl groups are oxidized during the oxidative treatment to carboxyl groups, which are more hydrophobic at low pH. This hypothesis was partly supported by FTIR-analysis, but obviously other mechanisms were also involved.

    AB - Floc properties and dewatering of activated sludge from the pulp and paper industry were studied prior to and after an oxidative conditioning using Fenton's reagent Sludge samples were taken from four treatment plants, which differed with respect to organic loadings and wastewater source. Poor dewaterability was typical of heavily loaded sludges and a positive correlation between filtrability and the concentration of exopolysaccharides was observed. Oxidative conditioning improved the dewaterability of all the sludges tested, but especially that of heavily loaded sludges. Lab-scale piston press results were also comparable with those of controls conditioned with polyelectrolytes. As a result of the conditioning, the surface charge density of the flocs decreased and the contact angles of filter cakes were increased, which enhanced flocculation and settleability. It is possible that hydroxyl groups are oxidized during the oxidative treatment to carboxyl groups, which are more hydrophobic at low pH. This hypothesis was partly supported by FTIR-analysis, but obviously other mechanisms were also involved.

    U2 - 10.2166/wst.1993.0046

    DO - 10.2166/wst.1993.0046

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    JO - Water Science and Technology

    JF - Water Science and Technology

    SN - 0273-1223

    IS - 1

    ER -