The maximum conversion to methane (ABmax) is an important parameter for evaluating the anaerobic treatment
of any wastewater. Determination of the ABmax is carried out in batch experiments either by addition of inoculum or without. Inoculum addition represents inaccurate method due to production of dissolved organic matter and biogas from decay of the inoculum, while experiment without inoculum addition suffers from a long operational period. determined the ABmax of the pre-treated (in septic tank) grey water with inoculum addition at 30 C. They found a high ABmax for the pre-treated grey water (86%).