IMPROVED DESIGN AND CONTROL OF INDUSTRIAL AND MUNICIPAL NUTRIENT REMOVAL PLANTS USING DYNAMIC-MODELS

Dynamic simulation can be used to improve the design and performance o f the activated sludge process. This is illustrated by means of two ca se studies: 1. The simulation of a full scale industrial plant treatin g nitrogen-rich wastewater by an intensive nitrification-denitrificati on process. By means of simulation the most important operational cost (dosage of an external carbon source) was optimised and a control str ategy was proposed. 2. The simulation of a municipal wastewater treatm ent plant with the extension of nitrogen removal. Based on simulation the feasibility of the redesign was evaluated. In both cases the waste water composition was characterised and the biological model (the acti vated sludge IAWQ-model No. 1) calibrated. By means of respirometry an d standard laboratory analyses it was possible to estimate the COD fra ctions of the wastewater and the parameters for heterotrophic and auto trophic growth of biomass. (C) 1997 IAWQ. Published by Elsevier Scienc e Ltd.