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UWWTP Haulerwijk AB is a closed advanced treatment plant in Haulerwijk, Fryslân, Netherlands. It had a designed capacity of 10,350 m³/day, serving the local area under EU regulations.
UWWTP Heerenveen Oost is a closed advanced treatment plant in Heerenveen, Netherlands, with a designed capacity of 27,000 m³/day. It served the local agglomeration under EU regulations.