Effect of chemical composition on the flocculation dynamics of latex-based synthetic activated sludge

Tan Phong Nguyen, Nicholas P. Hankins, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    This study investigates the effect of calcium, alginate, fibrous cellulose, and pH on the flocculation dynamics and final properties of synthetic activated sludges. A laboratory-scale batch reactor, fed with standard synthetic sludges was used. The effects of varying calcium concentration (5-25 mM), alginate concentration (25-125 mg/L), fibrous cellulose concentration (0.2-0.8 g/L) and pH (3-9) on the sludge characteristics were studied by varying one parameter whilst keeping the others constant. The results from experiments indicated that the calcium, alginate, fibrous cellulose, and pH had the critical effect on the aggregation rate, flocs size, and made the improvement of the final properties of sludge. Dynamic measurements have established the optimum conditions for floc formation and can accurately reflect the state of formation of the synthetic activated sludge flocs. These correlate well with measurements of settleability and turbidity of the synthetic activated sludge. The results of this study support the bonding theory and indicate that formation of cations-polymer complexes and polymer gelation are important means of flocculation. The development of synthetic activated sludges is suggested also to be a possible surrogate for studying the final properties of activated sludge.

    Original languageEnglish (US)
    Pages (from-to)265-274
    Number of pages10
    JournalJournal of Hazardous Materials
    Volume139
    Issue number2
    DOIs
    StatePublished - Jan 10 2007

    Fingerprint

    Flocculation
    Alginate
    Latex
    Sewage
    Latexes
    flocculation
    Cellulose
    activated sludge
    Calcium
    chemical composition
    alginate
    Polymers
    cellulose
    Chemical analysis
    calcium
    sludge
    Batch reactors
    Turbidity
    Gelation
    polymer

    Keywords

    • Flocculation dynamics
    • Malvern Mastersizer-S
    • Photometric dispersion analyser (PDA)
    • Sludge properties
    • Synthetic activated sludge

    ASJC Scopus subject areas

    • Chemical Health and Safety
    • Process Chemistry and Technology
    • Safety, Risk, Reliability and Quality
    • Environmental Engineering

    Cite this

    Effect of chemical composition on the flocculation dynamics of latex-based synthetic activated sludge. / Nguyen, Tan Phong; Hankins, Nicholas P.; Hilal, Nidal.

    In: Journal of Hazardous Materials, Vol. 139, No. 2, 10.01.2007, p. 265-274.

    Research output: Contribution to journalArticle

    Nguyen, Tan Phong ; Hankins, Nicholas P. ; Hilal, Nidal. / Effect of chemical composition on the flocculation dynamics of latex-based synthetic activated sludge. In: Journal of Hazardous Materials. 2007 ; Vol. 139, No. 2. pp. 265-274.
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