KVÄVEREDUKTION I ETT BASSÄNGREAKTORSYSTEM / Nitrogen Removal in a Suspended Growth System
The intention with the trial operation at the sewage treatment plant Västra Stranden, Halmstad was to investigate what the nitrogen removal would be during summer conditions after extension of the tanks for anoxic pre-denitrification to the double. The flow to the three separate activated sludge units was distributed in such a way that two of these units were charged with the normal and half the normal flow, respectively. The third unit with the residual flow was operated without biological denitrification during the whole trial operation. It was possible to operate the tank reactor with anoxic pre-denitrification with a high content of suspended solids (MLSS=3,500-4,000 mg/1) without deteriorated sedimentation due to increased sludge volume index. This is considered to be favourable with respect to the nitrogen removal. “Complete abstract not presented.”