In shell side mode, PDMS was more efficient and no wetting phenomenon was 23 observed with this contactor. The differences have been explained, taking into account 24 2 the material properties (porosity, material resistance …) of the membrane and structure 25 (packing density, fibre diameter …) of the modules. Methane removal efficiencies of up 26 to 98% could be achieved, showing the viability of methane removal/recovery using this 27 technology. Simultaneous degassing of CO 2 was also monitored in both modules, 28 showing that the removal efficiency of this gas was considerably lower than for 29 methane. In general terms, the removal of dissolved CO 2 followed a quite similar 30 behaviour from that described for methane. Experimental overall mass transfer 31 coefficients were also obtained. 32 Keywords 33Anaerobic reactor; degassing; greenhouse gas emissions; membrane contactors; 34 methane recovery 35 36 3

11The performance, fouling and feasibility of a polydimethylsiloxane hollow fibre 12 membrane module for in situ methane degasification from the effluent of an Expanded

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