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TP 331 of Kouvolan kt is a municipal wastewater treatment plant in Kouvola, Kymenlaakso, Finland, serving approximately 80,000 people. It operates under Finland's implementation of the EU Urban Waste Water Treatment Directive.
TP 359 of Kouvolan kt is a municipal wastewater treatment plant in Kouvola, Kymenlaakso, Finland, serving approximately 37,000 people. It operates under Finland's implementation of the EU Urban Waste Water Treatment Directive.