11
Water purification apparatus and installations; apparatus, devices and installations (fixed or mobile) for the treatment and purification of water by means of clarification and settlement; apparatus, devices and installations (fixed or mobile) for the treatment of waste water, sludge, waste; apparatus, devices and installations (fixed or mobile) for urban and industrial waste water purification; activated sludge chambers; apparatus, devices and installations (fixed or mobile) for disinfecting water and sludge; apparatus, devices and installations (fixed or mobile) for the treatment of water using ultraviolet rays; ultraviolet lamps (not for medical purposes)
37
Construction, commissioning, repair and maintenance of apparatus, devices and installations for the treatment of waste water by ultraviolet rays; construction, commissioning, repair and maintenance of apparatus, devices and installations (fixed or mobile) for disinfecting water and sludge; construction, commissioning, repair and maintenance of apparatus, devices and installations (fixed or mobile) for the treatment of water and sludge; construction, commissioning, repair and maintenance of apparatus, devices and installations (fixed or mobile) for the purification of water
40
Water, waste water, sludge and waste treatment as part of domestic, municipal or industrial applications; services relating to the quality control of water and air; treatment of water for the potabilisation or decontamination thereof; services relating to water treatment by ultravoilet rays; waste treatment (transformation); treatment and/or disinfection and/or purification of water and sludge as part of domestic, municipal or industrial applications