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Unfortunately, there is no exact answer for this question. The number of wastewater treatment plants varies greatly depending on the size of the city or region and its level of development. Additionally, this number is constantly changing as countries build new plants to improve their water cleanlinRead more
Unfortunately, there is no exact answer for this question. The number of wastewater treatment plants varies greatly depending on the size of the city or region and its level of development. Additionally, this number is constantly changing as countries build new plants to improve their water cleanliness.
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