Installations and equipment for water purification; apparatus, devices and installations (fixed or movable) for water treatment and purification including clarification and settling; apparatus, devices and installations (fixed or movable) for treating wastewater, slurry, waste; apparatus, devices and installations (fixed or movable) for purifying urban and industrial wastewater; apparatus, devices and installations for water purification, namely activated sludge tanks; apparatus, devices and installations (fixed or movable) for disinfecting water or slurry; apparatus, devices and installations (fixed or movable) for treating water using ultraviolet radiation; ultraviolet lamps (not for medical use)