BS ISO 24516-4. Guidelines for the management of assets of water supply and wastewater systems. Part 4. Wastewater treatment plants (including pumping and sludge treatment)— 66 стр.
BS ISO 24516-2. Guidelines for the management of assets of water supply and wastewater systems. Part 2. Waterworks including treatment, pumping and storage 9 (also in the networks)— 64 стр.