EghtesadOnline: Iran’s wastewater treatment plants have a processing capacity of approximately 6.4 million liters per day, 24% of which were created in the past four years, the managing director of state-run National Water and Wastewater Engineering Company said.

EghtesadOnline: The processing capacity of wastewater treatment plants in Iran has increased by more than a quarter in the last four years, Energy Minister Hamid Chitchian said on Friday.