A methane fermentation system for treating swine wastes was developed and successfully demonstrated in a field test plant (0.5 m3/d). The system was composed of a screw-press dehydrator, a methanogenic digester, a sludge separator, an oxidation ditch (OD) and composting equipment. A performance evaluation was carried out regarding physical pre-treatment using the screw-press dehydrator, methane fermentation for pre-treated slurry, and post-treatment for digested effluent by OD. Total solids (TS) and chemical oxygen demand (CODCr) removal by the screw-press pre-treatment were 38% and 22%, respectively. Properties of the screenings were as follows: water content 57%, ignition loss 93%, specific gravity 0.33. The pretreated strong slurry was digested under mesophilic conditions. Digestion gas (biogas) production rate was 25 m3/m3-slurry (NTP) and methane content of the biogas was 67%. CODCr removal of 65% with methane fermentation treatment of the slurry operating at 35°C was observed. No inhibition of methane fermentation reaction occurred at the NH4+-N concentration of 3,000 mg/l or less during methane fermentation by the system. Mass balance from the present pilot-scale study showed that 1m3 of mixture of excrement and urine of swine waste (TS 90 kg/m3) was biologically converted to 25 m3/m3-slurry (NTP) of biogas (methane content 67%), 100 kg of compost (water content 40%, ignition loss 75%), and 0.80 m3 of treated water (SS 30-70 mg/l).
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Research Article|
June 01 2002
Field test of methane fermentation system for treating swine wastes
N. Kataoka;
N. Kataoka
*Biotechnology Laboratory, Ebara Research Co., Ltd., 2-1, Honfujisawa 4-chome, Fujisawa-shi 251-8502, Japan
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T. Suzuki;
T. Suzuki
**Environmental Engineering Group, Ebara Corp., 1-6-27, Kohnan, Minato-ku, Tokyo 108-8480, Japan
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K. Ishida;
K. Ishida
**Environmental Engineering Group, Ebara Corp., 1-6-27, Kohnan, Minato-ku, Tokyo 108-8480, Japan
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N. Yamada;
N. Yamada
**Environmental Engineering Group, Ebara Corp., 1-6-27, Kohnan, Minato-ku, Tokyo 108-8480, Japan
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N. Kurata;
N. Kurata
***Livestock Industry Research Institute, Kanagawa Prefectural Government, 3750, Hongoh, Ebina-shi 243-0417, Japan
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M. Katayose;
M. Katayose
***Livestock Industry Research Institute, Kanagawa Prefectural Government, 3750, Hongoh, Ebina-shi 243-0417, Japan
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K. Honda
K. Honda
****Livestock Industry's Environmental Improvement Organization, 3-19-13, Toranomon, Minato-ku, Tokyo 105-0001, Japan
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Water Sci Technol (2002) 45 (12): 103–112.
Citation
N. Kataoka, T. Suzuki, K. Ishida, N. Yamada, N. Kurata, M. Katayose, K. Honda; Field test of methane fermentation system for treating swine wastes. Water Sci Technol 1 June 2002; 45 (12): 103–112. doi: https://doi.org/10.2166/wst.2002.0415
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