Potatoes are a major crop for the United States Pacific Northwest (Idaho,WashingtonandOregon),with12.5milliontonsharvestedin 2011 (PotatoPRO, 2015), and approximately 50% of the potatoes were processed into fries and other products. Potato peel waste (PPW) is the main co-product of steam peeling generating about 8% waste by weight (Mader et al., 2009), and waste disposal is becoming a major issue. An alternative method has been developed to convert PPW into mainly lactic acid with mixed microbial consortia in batch and sequencing batch fermenters