Bench-scale operation of a concrete sludge recycling plant

Atsushi Iizuka, Yuka Sakai, Akihiro Yamasaki, Masato Honma, Yasuyuki Hayakawa, Yukio Yanagisawa

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)


    A bench-scale plant for waste concrete sludge recycling was designed, constructed, and operated. Real concrete sludge generated from a pile and pole production plant and groundwater were used for the experiments. The process mainly consists of the extraction of calcium ions from the concrete sludge into the aqueous phase and the crystallization of calcium carbonate from the solution with CO 2. The CO 2 was supplied from boilers installed in the plant, where heavy oil is combusted. High-purity calcium carbonate (>99%) was obtained in the process, with particle sizes distributed in the range of 3-30 μm (volume-based), peaking at about 10 μm. A net reduction in CO 2 emissions can be achieved based on the process power consumption and the amount of product. The effects of operating conditions on process performance data such as calcium extraction rate and calcium carbonate crystallization rate were examined, which can lead to scaling-up of the plant.

    Original languageEnglish
    Pages (from-to)6099-6104
    Number of pages6
    JournalIndustrial and Engineering Chemistry Research
    Issue number17
    Publication statusPublished - 2012 May 2

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering


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