Based on a comparison of 13 countries in 2014, France ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - secondary treatment - Incoming load BOD5 with 795 tonnes of O2/day followed by Romania and Hungary. On the other end of the scale was Serbia with 1.40 tonnes of O2/day, Denmark with 6.10 tonnes of O2/day and Netherlands with 6.90 tonnes of O2/day.
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