Upgrading of a small wastewater treatment plant in a cold climate region using a moving bed biofilm reactor (MBBR) system

The aim of this study was to evaluate the performance of a full-scale upgra ding of an existing RBC wastewater treatment plant with a MBBR (Moving Bed Biofilm Reactor) system, installed in a tank previously used for sludge aer obic digestion. The full-scale plant is located in a mountain resort in the North-East of Italy. Due to the fact that the people varied during the yea r's seasons (2000 resident people and 2000 tourists) the RBC system was ins ufficient to meet the effluent standards. The MBBR applied system consists of the FLOCOR-RMP(R) plastic media with a specific surface area of about 16 0 m(2)/m(3) (internal surface only). Nitrogen and carbon removal from waste water was investigated over a 1-year period, with two different plant lay-o uts: one-stage (only MBBR) and two stage system (MBBR and rotating biologic al contactors in series). The systems have been operated at low temperature (5-15 degrees C). 50% of the MBBR volume (V=79 m(3)) was filled. The organ ic and ammonium loads were in the average 7.9 gCOD m(-2) d(-1) and 0.9 g NH 4-N m(-2) d(-1). Typical carbon and nitrogen removals in MBBR at temperatur e lower than 8 degrees C were respectively 73% and 72%.