Based on a comparison of 10 countries in 2014, Netherlands ranked the highest in Treatment Capacity of Wastewater Plants - Urban wastewater treatment plants - tertiary treatment of which nitrogen removal - Effluent BOD5 with 18.3 tonnes of O2/day followed by Hungary and Romania. On the other end of the scale was Ireland with 0.300 tonnes of O2/day, Slovenia with 0.600 tonnes of O2/day and Czechia with 1.10 tonnes of O2/day.
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