Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Ion Water Washing of Neutralized Sludge Contaminated by High Concentrations of Chloride
Chiharu TokoroYuji OdaShuji OwadaHiroshi Hayashi
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2013 Volume 54 Issue 7 Pages 1176-1181


The effects of NO3 and SO42− 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 SO42− water to levels below those specified in the standard for Eco-cement production (1,000 mg/kg), but the washed sludges did not meet the standard for ordinary Portland cement (350 mg/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 SO42− water was used to wash the sludge. The filtration rate during washing using SO42− water was faster than when distilled water or NO3 water was used because SO42− ions were adsorbed onto the sludge particles and the absolute value of the zeta potential of the sludge particles decreased. Overall, sludge washing using SO42− water was the best process for chloride ion removal and efficient filtration.

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© 2013 The Japan Institute of Metals and Materials
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