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Characterization of Anaerobic Degradability and Kinetics of Harvested Submerged Aquatic Weeds Used for Nutrient Phytoremediation

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  • Takuro Kobayashi

    (Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan)

  • Ya-Peng Wu

    (Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan)

  • Zhi-Jiang Lu

    (Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan)

  • Kai-Qin Xu

    (Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
    School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan road, Minghang District, Shanghai 200240, China)

Abstract

In this study, eight different submerged aquatic species were screened by batch biochemical methane potential and anaerobic degradability tests to identify a promising/suitable feedstock. Kinetics of the best-screened substrate were studied in a mesophilic semi-continuous experiment. The aquatic species Myriophyllum aquaticum , Egeria densa and Potamogeton perfoliatus showed relatively higher methane yields of over 400 NmL/g-VS (volatile solids). Semi-continuous operation was carried out by feeding E. densa for over 400 days. The achieved results were 33%–53% chemical oxygen demand (COD) reduction and methane yield of 126–231 NmL/g-VS with a short hydraulic retention time (HRT). Additionally, the NH 4 + and PO 4 3− releases from the biomass to water were found to be low (18%–27% and 2.5%–3.9%) throughout the experiment. Hydrolysis was the limiting step in the digestion of E. densa , regardless of changes in HRT (15–45 days). The acid-phase model indicated that the hydrolysis rate constant (k h ) of E. densa was 0.058 one/day, which was one third lower the k h value of food waste, but quite similar to cow manure.

Suggested Citation

  • Takuro Kobayashi & Ya-Peng Wu & Zhi-Jiang Lu & Kai-Qin Xu, 2014. "Characterization of Anaerobic Degradability and Kinetics of Harvested Submerged Aquatic Weeds Used for Nutrient Phytoremediation," Energies, MDPI, vol. 8(1), pages 1-15, December.
    • Handle: RePEc:gam:jeners:v:8:y:2014:i:1:p:304-318:d:44195
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    References listed on IDEAS

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    1. Karthik Rajendran & Solmaz Aslanzadeh & Mohammad J. Taherzadeh, 2012. "Household Biogas Digesters—A Review," Energies, MDPI, vol. 5(8), pages 1-32, August.
    2. Takuro Kobayashi & Ya-Peng Wu & Kai-Qin Xu & Yu-You Li, 2013. "Effect of Mixing Driven by Siphon Flow: Parallel Experiments Using the Anaerobic Reactors with Different Mixing Modes," Energies, MDPI, vol. 6(8), pages 1-16, August.
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    Cited by:

    1. Nagy, Gábor, 2024. "The application and treatment of freshwater macrophytes as potential biogas base materials: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 199(C).

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