Abstract
It is well known that nutrient removal performance depends on the concentration of readily biodegradable organic matter in the influent. Installing primary sludge fermentation process is one of the candidates to supply such a biodegradable organic matter to biological reactors. The mathematical model was developed for describing primary sludge fermentation process, in the form that the model could be integrated with the Activated Sludge Model. The validity of the model was confirmed with data from lab-scale batch experiments with primary sludge from municipal wastewater treatment plant. Inorder to demonstrate the application of the model, primary sludge fermentation process combined with nutrient removal process model, steady and unsteady simulations were performed. The steady stateanalysis showed the procedure for setting required fermented sludge volume and SRT. The unsteady state simulation showed that installing primary sludge fermentation process improves the stability of phosphorous removal in rain event.
