Based on a comparison of 2 countries in 2014, Romania ranked the highest in Treatment Capacity of Wastewater Plants - Other wastewater treatment plants - secondary treatment - Effluent BOD5 with 9.60 tonnes of O2/day followed by Serbia and . On the other end of the scale was Serbia with 0.100 tonnes of O2/day, Romania with 9.60 tonnes of O2/day and with .
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