Long-term biogas desulfurization under different microaerobic conditions in full-scale thermophilic digesters co-digesting high-solid sewage sludge 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
International Biodeterioration & Biodegradation
年/卷/期
2019 / 142 /
页码
131-136
ISSN号
0964-8305
作者单位
Acqua & Sole Srl, Via Giulio Natta, Bellini, PV, Italy;Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy;Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy;Univ Naples Federico II, Dept Civil Architectural & Environm Engn, Via Claudio 21, I-80125 Naples, Italy;
作者
Giordano, Andrea;Di Capua, Francesco;Esposito, Giovanni;Pirozzi, Francesco;
摘要
Long-term (81 weeks) microaerobic biogas desulfurization was investigated in three full-scale thermophilic digesters in series co-digesting sewage sludge with co-products of source segregated domestic food waste. Residual oxygen (RO) concentrations in the digester headspaces were maintained at fixed values from 2.0% to 0.2% (v/v). Complete H2S removal was obtained at all tested RO concentrations under organic loading rate (OLR) and hydraulic retention time (HRT) varying between 1.5 and 2.3 kg VS/m(3) d and between 44 and 71 d, respectively. Specific oxygen and air consumptions of 0.88 kg O-2/ton VSin and 0.73 %ton air/ton biogas, respectively, were obtained by linear regressions with the RO values maintained in the biogas. Mass balance and stoichiometric evaluations revealed that from 13% to 59% of the consumed O-2 was used for processes other than partial H2S oxidation to elemental sulfur (S-0). The relatively high ammonium concentrations (3.5-3.8 g N-NH4+/kg digestate) in the liquid phase of the three digesters presumably limited the biological H2S production and S-0 accumulation in the headspace. The results of this study can be used for designing the aeration systems of full-scale thermophilic digesters.
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关键词/主题词
Biogas desulfurization;Microaeration;Thermophilic digestion;Full-scale digesters;Sulfide removal;
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