Houston, Texas [RenewableEnergyAccess.com]Nova Biosource Fuels, Inc. announced last week that start-up operations are continuing to progress at the 20 million gallon per year biodiesel refinery being constructed for Sanimax in DeForest, Wisconsin. Since the initial plant commissioning, approximately 2 million gallons of biodiesel have been produced, some of which is from 100 percent animal fat feedstock. The refinery has used a variety of feedstocks with free fatty acid (FFA) levels ranging from less than 2 percent to approximately 7 percent in sustained production runs at near-throughput design rates using Nova Biosource’s proprietary, patented process technology. Future test runs in the start-up phase are expected to include feedstocks with FFA levels of up to 20 percent. The ability of the biodiesel refinery to process feedstocks with higher FFA levels is significant because these feedstocks tend to cost less than feedstocks with lower FFA levels.