WCW24

City of Winnipeg's South End Water Pollution Control Centre (SEWPCC) has undergone a major expansion and upgrade, allowing the plant to meet more stringent discharge limits and to increase its peak secondary treatment capacity from 100 ML/d to 225 ML/d. The previous High Purity Oxygen (HPO) tanks were replaced by three integrated fixed film activated sludge (IFAS) bioreactors set up in a preanoxic, anaerobic, anoxic, aerobic, and post aerobic configuration. The HPO tanks were converted to two primary sludge fermentation units to provide the substrates required to enhance biological phosphorous removal performance. In the absence of the fermenters, operation logic of the bioreactors was modified to promote biological phosphorus removal and lower the ferric chloride consumption that was dosed to the bioreactors' mixed liquor to chemically precipitate phosphorous. The BNR process at SEWPCC has resulted in considerable improvement in the effluent quality with TSS