Potential of coagulation/GAC adsorption combined with UV/H2O2 and ozonation for removing dissolved organic matter from secondary RO concentrate

Xian Zhang, Jiuyang Lin, Wenyuan Ye, Wei Zhou, Xuxiang Jia, Shuaifei Zhao, Chunsong Ye

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    BACKGROUND: Organic contaminants in secondary reverse osmosis (SRO) concentrate pose a severe threat to the ecosystem, due to their potential toxicity. In this study, potential of coagulation/granular activated carbon (GAC) adsorption combined with UV/H2O2 and ozonation for removing organic matter from industrial secondary RO concentrate was systematically investigated.

    RESULTS: Coagulation with 2.0 mmol L−1 FeCl3 yielded 40% removal of dissolved organic carbon (DOC), while adsorption with 5 g L−1 GAC could boost the removal efficiency up to 78.2%. Fractionation results showed that both coagulation and GAC adsorption favored hydrophobic organics. UV/H2O2 oxidation was capable of removing 87.4% of DOC, which outperformed ozonation (58.2%). UV/H2O2 and ozonation showed similar behavior in dissolved organic matter (DOM) degradation: a portion of hydrophobic organics were first transformed into hydrophilic fractions prior to final mineralization.

    CONCLUSION: Coupling of GAC as post‐treatment with a UV/H2O2 process yielded 97.9% removal of DOC and the corresponding electrical energy per order (EE/O) was decreased from 66.7 to 35.8 kWh m−3. Consequently, a simple UV/H2O2 and GAC hybrid process was proposed to be a suitable method for removing DOM from SRO concentrate.
    Original languageEnglish
    Pages (from-to)1091-1099
    Number of pages9
    JournalJournal of Chemical Technology and Biotechnology
    Volume94
    Issue number4
    Early online date25 Oct 2018
    DOIs
    Publication statusPublished - Apr 2019

    Keywords

    • adsorption
    • coagulation
    • dissolved organic matter
    • ozonation
    • secondary reverse osmosis concentrate
    • UV/H2O2

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