Recovery and biological oxidation of dissolved methane in effluent from UASB treatment of municipal sewage using a two-stage closed downflow hanging sponge system

Anaerobic treatment of municipal wastewater in a UASB-Digester system : temperature effect on system performance, hydrolysis and methanogenesis

“…This is in agreement with Matsuura et al (2015), who found that the dissolved methane concentration only exhibited small changes between 23.5-28°C and 14.6-24.2°C, i.e. 74 and 72 mg CH4 COD/L, respectively.…”

“…In this manner 72% and 86% of the dissolved methane were recovered, respectively. Two stages of DHS were applied to subsequently remove the remaining effluent dissolved methane (Matsuura et al, 2015). 58-88% of the dissolved methane was recovered in the first stage, and the residual dissolved methane was almost completely oxidized in the second stage.…”

“…Besides, a membrane technology such as hollow-fiber membranes and a poly-di-methyl-siloxane (PDMS) membrane contactor can be used for degasification and to strip the dissolved methane respectively (Cookney et al, 2012;Hatamoto et al, 2010). Two subsequent stages of DHS were applied to successfully aerobically oxidize the remaining effluent dissolved methane (Matsuura et al, 2015). Besides, vacuum degasification was studied to transfer dissolved gas in the liquid of the UASB reactor inside the membrane, and COD removal efficiency was increased from 83% to 90% (Bandara et al, 2013).…”

A novel configuration for an anaerobic submerged membrane bioreactor (AnSMBR). Long-term treatment of municipal wastewater under psychrophilic conditions

“…The N 2 composition was lower compared with the values from the literature. Matsuura et al (2015) working with an UASB reactor, treating municipal sewage at ambient temperatures (10-28°C), obtained nitrogen concentrations in biogas of between 25% and 33%.…”

“…In addition, during anaerobic treatments, greenhouse gas emissions are lower in comparison to aerobic technologies, if methane is used as an energy source (Bialek et al, 2014;Lew et al, 2009). On the contrary, the loss of dissolved methane in the effluent should be avoided, not only due to the loss of energy, but also because of its higher global warming potential (Matsuura et al, 2015;Smith et al, 2013). Over the past years, anaerobic membrane technology has been of growing interest and has been investigated for the treatment of different wastewaters, including municipal and industrial wastewaters (Lin et al, 2013;Ozgun et al, 2013;Skouteris et al, 2012;Smith et al, 2012).…”