Based on a comparison of 12 countries in 2014, Romania ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - secondary treatment - Effluent BOD5 with 61.8 tonnes of O2/day followed by Hungary and Switzerland. On the other end of the scale was Netherlands with 0.200 tonnes of O2/day, Norway with 0.500 tonnes of O2/day and Serbia with 0.700 tonnes of O2/day.
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