Based on a comparison of 11 countries in 2014, Norway ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - tertiary treatment - Effluent BOD5 with 55.5 tonnes of O2/day followed by Switzerland and Hungary. On the other end of the scale was Serbia with 0.200 tonnes of O2/day, Slovenia with 0.900 tonnes of O2/day and Bulgaria with 6.70 tonnes of O2/day.
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