Treatment of natural rubber processing wastewater using a combination system of a two-stage up-flow anaerobic sludge blanket and down-flow hanging sponge system

D. Tanikawa, K. Syutsubo, M. Hatamoto, M. Fukuda, M. Takahashi, P. K. Choeisai, T. Yamaguchi

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    A pilot-scale experiment of natural rubber processing wastewater treatment was conducted using a combination system consisting of a two-stage up-flow anaerobic sludge blanket (UASB) and a downflow hanging sponge (DHS) reactor for more than 10 months. The system achieved a chemical oxygen demand (COD) removal efficiency of 95.7%±1.3% at an organic loading rate of 0.8 kgCOD/(m3.d). Bacterial activity measurement of retained sludge from the UASB showed that sulfate-reducing bacteria (SRB), especially hydrogen-utilizing SRB, possessed high activity compared with methaneproducing bacteria (MPB). Conversely, the acetate-utilizing activity of MPB was superior to SRB in the second stage of the reactor. The two-stage UASB-DHS system can reduce power consumption by 95% and excess sludge by 98%. In addition, it is possible to prevent emissions of greenhouse gases (GHG), such as methane, using this system. Furthermore, recovered methane from the two-stage UASB can completely cover the electricity needs for the operation of the two-stage UASB-DHS system, accounting for approximately 15% of the electricity used in the natural rubber manufacturing process.

    Original languageEnglish
    Pages (from-to)1777-1784
    Number of pages8
    JournalWater Science and Technology
    Volume73
    Issue number8
    DOIs
    Publication statusPublished - 2016 Apr

    Keywords

    • Energy recovery
    • GHG emission
    • Natural rubber processing wastewater
    • Sulfate reduction
    • Two-staged UASB-DHS system

    ASJC Scopus subject areas

    • Environmental Engineering
    • Water Science and Technology

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