The Automatic control group has a long history of dynamic modeling and control of wastewater treatment processes (WWTPs), originating in the STAMP program launched by NUTEK in 1991. In particular, the focus is on models based on microbiological processes, resulting in bacterial population dynamics, and combining this with physical models of the hydraulics, solids, biofilms and mechanical parts.
A specific application we put effort into is Recirculating Aquaculture Systems (RAS), where the fish tank effluent is biologically treated and then recirculated back to the fish tanks. This offers a possibility for large scale ecologically sustainable fish production. In order to fully exploit the advantages of RAS, however, the water exchange should be as small as possible. This implies strong demands on the water treatment, e.g. the maintenance of an efficient nitrification, denitrification and organic removal. Because of the RAS complexity, though, dynamic simulations are required to analyze and optimize a plant with respect to effluent water quality, production and robustness. We are therefore developing a unified framework for integrated dynamic aquaculture and wastewater treatment modeling.