Biological treatment of organic matters, nitrogen, and phosphorus (including chemical precipitation of residual P)
Primary sludge and biological excess sludge treated in digesters
The challenges
Køge-Egnens WWTP had been trying to optimize nitrogen removal through online control for several years without much success.
The plant needed to increase its hydraulic capacity to treat a large amount of water during rain events.
One potential solution was a costly extension of the plant and an increase of the volume in the settling tanks.
The solution
Hubgrade Wastewater Plant Performance digital solution was implemented to holistically optimize the utility’s operations.
A feasibility study was performed to explore alternative solutions for Køge-Egnens WWTP.
The study showed that increasing the hydraulic capacity during rain was possible through intelligent control.
The study also showed that nitrogen removal could be improved and significant savings could be achieved.
The proposed solution allowed an increase of at least 35% and up to 60% in hydraulic capacity, while also improving nitrogen removal and providing significant savings in operation.
KEY FIGURES
M3 treated per day: 432,000
Effluent requirements: BOD=15mg/L
COD=75mg/L; Total-N=8mg/L, Total-P=1.5mg/L
35% reduction in electricity consumption
60% reduction in chemical consumption
100% increase in hydraulic capacity while improving the effluent quality on BOD and Total-N
