The wastewater from pulp and paper mills is a constantly changing and complex mixture of lignin-derived dissolved organic compounds (Thompson et al., 2001). The activated sludge process is the most common biological treatment method for pulp and paper wastewater and many of these biological systems operate at high temperatures, e.g., 20-35°C, (Morgan-Sagastume and Allen, 2004). In addition, fluctuations in the operating temperature often causes system instability (Kriebitzsch et al., 1998; Tripathi and Allen, 1999). Consequently, the goal of this study was to evaluate the effect of temperature on pulp and paper wastewater treatment, including biodegradation kinetics and mixed liquor
The Grand Rapids Wastewater Treatment Facility (WWTF) is owned and operated by the Grand Rapids Public Utilities Commission and treats approximately 6.6 million gallons per day (MGD); nearly 90 percent of that flow is from a pulp and paper 103 mill. The Mill has proposed process modifications to increase paper output capacity, which will affect wastewater flow and quality. After mill upgrades, flow will increase to 13 MGD, solids will increase by 85%, and BOD will increase by almost 250%.