Combining submerged membrane technology with anaerobic and ...

Denitrification with dissolved methane in an MBR after a methanogenic pre-treatment at ambient temperaturesludge mixture suspension (Sun et al., 2008). The critical flux was determined according tothe modified flux-step method proposed by van der Marel et al. (2009). The criterionemployed was that the increment of transmembrane pressure (TMP) with respect to timewas higher than 10 Pa·min -1 (Le-Clech et al., 2003).Further information regarding analythical methods is provided in Chapter 2.Figure 6.1. Schematic diagram of the bioreactor. (1) UASB methanogenic pre-treatment;(2) First MBR chamber; (3) Membrane filtration chamber; (4) Feeding; (5) Permeate(backwashing); (6) Biogas. P1, P2, P3, P4 and P5 refer to the sampling ports. Grey arrowrepresents the internal MBR recirculation between the membrane filtration and firstchambers.6.3.3. Denitrification batch experimentsTwo different batch denitrification assays using methane and/or acetate as electrondonor were performed using 500 ml flasks. In one of them the flasks were filled with 400155