For the day 120 clone library (OLR, 24 kg COD/m3/d), on the other hand, the aceticlastic methanogens including M. conciliiGP6 (31%), M. harundinacea (2%) and M. mazei (21%) accounted
for 54% of the total clones, seconded with the hydrogentophic methanogen Methanobacterium sp (27%) (Fig. 4).