Effect of ion water washing of neutralized sludge contaminated by high concentrations of chloride

Chiharu Tokoro, Yuji Oda, Shuji Owada, Hiroshi Hayashi

    Research output: Contribution to journalArticle

    2 Citations (Scopus)


    The effects of NO3 - and SO4 2- ions on chloride ion removal from neutralized sludge were investigated to determine if removal of chloride ions enabled the use of sludge for cement production. An artificial sludge prepared from iron, calcium and chloride that primarily consisted of two-line ferrihydrite was prepared. Chloride ions in the sludge were easily washed out by distilled water, NO3 - water or SO4 2- water to levels below those specified in the standard for Eco-cement production (1,000mg/kg), but the washed sludges did not meet the standard for ordinary Portland cement (350mg/kg). Conversely, artificial sludge prepared from aluminum, calcium and chloride mainly consisted of low crystalline boehmite with other minor components. Chloride ions in this sludge were only reduced to below those specified in the standard for the ordinary cement production if SO4 2- water was used to wash the sludge. The filtration rate during washing using SO4 2- water was faster than when distilled water or NO3 - water was used because SO4 2- ions were adsorbed onto the sludge particles and the absolute value of the zeta potential of the sludge particles decreased. Overall, sludge washing using SO 4 2- water was the best process for chloride ion removal and efficient filtration.

    Original languageEnglish
    Pages (from-to)1176-1181
    Number of pages6
    JournalMaterials Transactions
    Issue number7
    Publication statusPublished - 2013



    • Chloride removal
    • Filtration rate
    • Low crystalline boehmite
    • Sludge recycling
    • Two-line ferrihydrite

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this