| Title |
Hydrogenotrophic biogas upgrading integrated into WWTPs: enrichment strategy |
| ID_Doc |
10493 |
| Authors |
Corbellini, V; Catenacci, A; Malpei, F |
| Title |
Hydrogenotrophic biogas upgrading integrated into WWTPs: enrichment strategy |
| Year |
2019 |
| Published |
Water Science And Technology, 79, 4 |
| DOI |
10.2166/wst.2019.096 |
| Abstract |
Within the European circular economy roadmap, it is important for wastewater treatment plant (WWTPs) to recover energy and become energy-neutral or -positive. In the last few years, it has become increasingly interesting to boost energy recovery through the biogas upgrading. The aim of this work is to study a rapid hydrogenotrophic methanogenic culture enrichment strategy capable of limiting the organic degradation unbalance and allowing a fast start-up phase of the in situ biogas upgrading reactors, at pilot- or full-scale. The approach was tested with two, plus one control, laboratory-scale continuous stirred tank reactors filled with anaerobic sludge collected from a full-scale WWTP. The experimentation lasted 50 days and was divided into five phases: the anaerobic digestion start-up followed by four H-2 injection phases (H-2/CO2 ranging from 1:1 to 4:1 on molar basis). Despite a temporary slight increase in the total concentration of volatile fatty acids during phase II (2.56 gCH(3)COOH center dot L-1), and in phase III a mild pH increase (anyway, below 7.4) indicating the expected CO2 depletion, the strategy proposed was effective. In the last phase, in the biogas a methane content of about 80% was achieved, thus suggesting that the use of H-2/CO2 above the stoichiometric value could further improve the biological biogas upgrading. |
| Author Keywords |
biomethane; culture enrichment; hydrogenotrophic methanogens; in situ biogas upgrading; WWTP |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000467380300017 |
| WoS Category |
Engineering, Environmental; Environmental Sciences; Water Resources |
| Research Area |
Engineering; Environmental Sciences & Ecology; Water Resources |
| PDF |
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