OPtimization of Nutrient Control in A Paper Mill Activated Sludge System

摘要

Activated sludge systems typically rely on monitoring effluent ammonia and orthophosphate residuals to maintain proper feed rates of nutrient formulations. While maintaining adequate effluent residuals is certainly a key compoent to proper nutrient control, it only provides part of the answer, particularly in systems prone to nitrificatioin. Through the use of chemical oxygen demand as a surogate for biochemical oxygen demand and a computer model to predict feed rates, a feed forward approach was implemented. This feed forward approach was utilized in conjunction with residual monitoring and monthly inventory trackign to ensure that adequate nutrients were routinely available for the bimass. The computer model is also used to make necessary adjustments in the N:P ratio of the commercial nutrient blend, thereby maintaing optimum product eficacy and cost performance.