Effluent from the eastern Czech city of Ostrava will continue to flow untreated into the Oder River for months, the city authorities announced on Thursday. Mechanical filtration would be operational by the end of the year, and biological purification by the end of February 2025, they said. The city’s main treatment plant was flooded and damaged during the September flooding in central Europe. “The water rose to up to 6 metres on the site, leading to the total collapse of the electrical plant, the machinery and all the equipment,” Ostrava Mayor Jan Dohnal said. He put the total damage at the eq…