Abstract
Boras wastewater treatment plant is being upgraded to comply with the new effluent standards for nitrogen. Three different configurations have been tested in parallel in full scale in the existing activated sludge plant. The Biodenitro operated line showed the best performance because of the flexible adjustment of the nitrification and denitrification capacity. The adjustment was made off-line with the aid of continuous ammonia and nitrate measurements. On-line sensors are now installed permanently at Boras wastewater treatment plant and will be used for on-line dynamic control of the nitrogen removal in a Biodenitro configuration. The plant capacity will be further increased by settling in the aeration tanks in situations with high hydraulic load.
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