Based on a comparison of 10 countries in 2014, Norway ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - primary treatment - Effluent BOD5 with 55.6 tonnes of O2/day followed by Romania and Ireland. On the other end of the scale was Serbia with 0.100 tonnes of O2/day, Czechia with 0.100 tonnes of O2/day and Hungary with 0.100 tonnes of O2/day.
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