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Wastewater treatment plants serving more than10000 population equivalents (1 population equivalent = organic biodegradable load having 60 g of BOD per day calculated on the basis of themaximum average weekly load entering the plantduring the year) and discharging to sensitive watersor to the catchment areas which contribute to thepollution of these areas. must employ more stringent treatment than secondary treatment by 31December 1998. However, this need not apply insensitive areas where it can he shown that theminimum percentage reduction in the overall loadentering all urban wastewater treatment plants inthat area is at least 75% for total phosphorus and atleast 75% for total nitrogen.
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