Wang et al. [25] filled the 65% of working volume with polyeth-ylene support for the treatment of milk permeates in an AMBBR at35◦C. They observed decline in pH due to accumulation of VFAs atvery short HRT and COD removal was mainly depended on OLR. Atvery short HRT there was no failure in bioreactor operation whichwas associated due to the fact that support materials were capa-ble of retaining more attached biomass inside the reactor. CODremoval efficiencies were between 73.2 and 86.3% at OLR ranges of2.0–20.0 kg COD m−3d−1and sludge yield was 0.0794 kg VSS kg−1CODremoved. Researchers reported that 88.8% of the removed CODwas converted to CH4, and the remaining 11.2% was presumablyconverted to biomass. Researchers achieved one of the highest OLRvalues reported for biofilm bioreactors treating dairy wastewater.Stable treatment efficiency at various elevated organic loading ismain advantages of AMBBR whereas use of high amount of specialsupport material inside the reactor could increase the capital cost.Wang et al. [50] investigated the effect of temperature onthe treatment of high-strength milk permeate (50–75 g L−1) in anAMBBR at sub-mesophilic (20–25◦C) and mesophilic (35–40◦C)conditions. Considerable amount of sludge was wash-out from thereactor due to the exfoliation of biofilm from the carriers. Maximumstable OLRs of 5.5 and 9.5 kg COD m−3d−1with corresponding HRTsof 14 and 6.8 d were achieved, respectively, under sub-mesophilicand mesophilic condition. Moreover, soluble COD removal effi-ciencies were 92% in sub-mesophilic and 96% in mesophilic whileCH4yield values almost the same for both temperatures and sub-strate utilization rate of mesophilic culture was almost two timeshigher than sub-mesophilic. Experimental results from two studies[25,50] indicates that AMBBR has promising treatment capabilityof high-strength dairy wastewater at various organic loading andtemperature ranges.