AI Article Synopsis
- The study examined methane (CH4) and nitrous oxide (N2O) emissions from a two-stage membrane bioreactor (MBR) used for treating municipal solid waste leachate, focusing on the impact of different operating conditions.
- Operating conditions included variations in hydraulic retention time (HRT) and the presence or absence of sludge recirculation, revealing over 80% removal efficiency for organic and nitrogen substances.
- Findings indicated that CH4 emissions peaked without sludge recirculation at a 5-day HRT, while N2O emissions remained relatively stable across conditions, with decreasing diversity of methane and nitrous oxide-producing microorganisms as hydraulic loading increased.
Article Abstract
Methane (CH4) and nitrous oxide (N2O) emissions and responsible microorganisms during the treatment of municipal solid waste leachate in two-stage membrane bioreactor (MBR) was investigated. The MBR system, consisting of anaerobic and aerobic stages, were operated at hydraulic retention time (HRT) of 5 and 2.5days in each reactor under the presence and absence of sludge recirculation. Organic and nitrogen removals were more than 80% under all operating conditions during which CH4 emission were found highest under no sludge recirculation condition at HRT of 5days. An increase in hydraulic loading resulted in a reduction in CH4 emission from anaerobic reactor but an increase from the aerobic reactor. N2O emission rates were found relatively constant from anaerobic and aerobic reactors under different operating conditions. Diversity of CH4 and N2O producing microorganisms were found decreasing when hydraulic loading rate to the reactors was increased.
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| http://dx.doi.org/10.1016/j.biortech.2016.01.109 | DOI Listing |
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