Based on a comparison of 13 countries in 2014, Norway ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - total - Effluent BOD5 with 112 tonnes of O2/day followed by Romania and Switzerland. On the other end of the scale was Albania with 0.700 tonnes of O2/day, Serbia with 0.900 tonnes of O2/day and Malta with 2.90 tonnes of O2/day.
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