Nutrient, COD and Solids Mass Balances for Pulp & Paper Activated Sludge Wastewater Treatment Plants: The Practical Benefits for a TMP Mill, 2007 Engineering, Pulping & Environmental Conference

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Nutrient, COD and solids mass balances were conducted for an activated sludge treatment (AST) plant of an integrated TMP-newsprint mill, and the costs for nutrient addition (nitrogen and phosphorus) were evaluated. An interpretation of the nutrient transformation phenomena occurring in each of the major unit processes is presented, as well as an overview of the differences between municipal and pulp and paper effluent treatment with respect to nutrient transformation. The use of the activated sludge models (ASM) initially developed for municipal wastewater to model nutrient transformations is discussed. The practical benefits and cost savings for the mill through better control of nutrient addition have been estimated at between CAN$13,000 and $85,000 annually.