At the North Pest Wastewater Treatment Plant, a nutrient removal process udhas been in operation since 2011. New tanks have been built, which can udreceive approximately half of the pre-settled wastewater. A pre-uddenitrification system has been planned and built both to the old and new udlines. Due to the relatively small anoxic zones, periodic aeration was udinitiated first in the new line to achieve the lowest possible effluent total udnitrogen concentration. Because of its positive impact, the operation of udperiodic aeration was initiated in the old line as well. Ammonium-analysers udare used to control the aeration periods. Due to this process, the plant can udprovide a very low total nitrogen effluent value (below 10 mg dm-3 on udaverage) as well as save energy and operational costs.
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