DIN 19569-3:2002-12 Wastewater treatment plants - Principles for the design of structures and technical equipment - Part 3: Specific principles for the equipment for aerobical biological wastewater treatment
2002DIN 19569-3:2002-12 Wastewater treatment plants - Principles for the design of structures and technical equipment - Part 3: Specific principles for the equipment for aerobical biological wastewater treatment
2002DIN 19569-3:2002 Wastewater treatment plants - Principles for the design of structures and technical equipment - Part 3: Specific principles for the equipment for aerobical biological wastewater treatment