The wastewater treatment plant of Shirvan city in the north-eastern province of North Khorasan has been built with an investment of one trillion rials and is ready to be used. (IRNA photos published on September 25/Vahid Khademi)
With a capacity of 6,000 cubic meters per day, it can cover a population of nearly 50,000 people and create jobs for more than 200 people.
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