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Speaking on the sidelines of an event to mark World Environment Day on Sunday, a Mumbai International Airport Pvt Ltd (MIAL) spokesperson said, “Fresh water is required for airport activities such as concessioners, cooking, drinking, cooling tower, etc. We can’t substitute fresh water requirement by treated sewage totally, but fresh water requirements in some activities, such as toilet flushing, gardening and cooling in HVAC, can be substituted by treated sewage. The sewage generated from... "read on.