2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference
Dr. Sheng Chang, University of Guelph
Mr. Youngseck Hong, GE Water and Process Technologies
Mr. Ping Wu, Ontario Ministry of Agriculture, Food and Rural Affairs
The micro-brewery business has been subjected to rapid growth within the last decade. Most brewers are facing expensive wastewater compliance bills and are seeking reliable on-site treatment methods. Anaerobic membrane bioreactor (AnMBR) treatment is favorable to the widely used upflow anaerobic sludge blanket (UASB) method. It offers high quality effluent with free of solids, and has a great stability under loading shocks. To date, there have been limited submerged AnMBR studies and none have been conducted on brewery wastewater. In this research, a state-of-the-art AnMBR laboratory scale system (supplied by GE Water and Process Technologies) was used to investigate the performance and capability. The system was subjected to 230 days continuous operation with both synthetic and real brewery wastewater at organic loading rates (OLRs) ranging from 2 to 11.5 kg COD/m3/day. During all tested OLRs, the AnMBR system demonstrated an excellent COD removal efficiency (>98%) and produced high quality effluent with less than 300 mg/L COD, as well as maintained a stable methane yield at 0.31 m3 CH4/kg COD (35 0C). While the system demonstrated an excellent biological performance, the study found that the major limitation of AnMBR was the membrane fouling, which increased with the OLR and soluble microbial products (SMPs) in the mixed liquor. The study suggests that AnMBRs should be operated at an OLR below 6.5 kg COD/m3/day and a filtration flux of 7 L/m2/hour (LMH) to achieve long term stability for treatment of high organic strength brewery wastewater treatment.