Recovery of Dissolved Methane in Effluent of Anaerobic Wastewater Treatment by Closed DHS Unit

Okawara, Masahiro; Hatamoto, Masashi; Nishiyama, K.; Matsuura, Norihisa; Abe, Kenichi; Syutsubo, Kazuaki; Imachi, Hiroyuki; Harada, Hideki; Yamaguchi, Takashi; Ohashi, Akiyoshi

doi:10.2965/jswe.33.25

Cited by 1 publication

(1 citation statement)

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“…The microorganisms belonging to Betaproteobacteria, Gammaproteobacteria, and Bacteroidetes dominated in the clone libraries (Table 2). These microorganisms were dominant in aerobic wastewater treatment system (Wagner & Loy, 2002), and also predominant in other DHS reactor (Kubota et al, 2010;Okawara et al, 2010). Methane-oxidizing bacterial species were detected only in upper and middle parts of the reactor and accounted for 6.4 and 2.2% of total clones, respectively ( Table 2).…”

Section: Microbial Community Analysismentioning

confidence: 99%

Dissolved methane oxidation and competition for oxygen in down-flow hanging sponge reactor for post-treatment of anaerobic wastewater treatment

Hatamoto

Miyauchi

Kindaichi

et al. 2011

Bioresource Technology

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Post-treatment of anaerobic wastewater was undertaken to biologically oxidize dissolved methane, with the aim of preventing methane emission. The performance of dissolved methane oxidation and competition for oxygen among methane, ammonium, organic matter, and sulfide oxidizing bacteria were investigated using a lab-scale closed-type down-flow hanging sponge (DHS) reactor. Under the oxygen abundant condition of a hydraulic retention time of 2h and volumetric air supply rate of 12.95m(3)-airm(-3)day(-1), greater than 90% oxidation of dissolved methane, ammonium, sulfide, and organic matter was achieved. With reduction in the air supply rate, ammonium oxidation first ceased, after which methane oxidation deteriorated. Sulfide oxidation was disrupted in the final step, indicating that COD and sulfide oxidation occurred prior to methane oxidation. A microbial community analysis revealed that peculiar methanotrophic communities dominating the Methylocaldum species were formed in the DHS reactor operation.

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Section: Microbial Community Analysismentioning

confidence: 99%