ESTIMERING AV ANDELEN PARTIKULÄRT INERT ORGANISKT MATERIAL I AVLOPPSVATTEN / Estimation of the Fraction Unbiodegradable Particulate Organic Material in Wastewater
The goal of this investigation was to determine a value for the fraction of unbiodegradable particulate oganic material in the influent wastewater at the Sjölunda WWTP. The method selected for this purpose was to operate rwo identical laboratory scale units as aerobic fill and draw activated sludge sysrems. This in order to generate data that were simulated afterwards in two different compuier models, BIOSIM and activated sludge Model No 1. The fraction of unbiodegradable particulate organic material was then determined by a best fit procedure. In this way the fraction of unbiodegradable parriculate organic material in the influent wastewater at the Sjölunda WWTP was found to be 15-17 % of the total COD. The experimental run also generated data that made it possible to esrimate the maximum growth rate of the nitrifyers to 0.8d-1.