11
Installations for purifying water, for water supply, for processing waste (conversion into energy, in particular by methanisation) and for the production of energy; installations for the purification of gas; installations for distributing energy in the form of gas, heat, electricity, cold or fuel; apparatus for fermenting and digesting pollutants; Apparatus for lighting and heating; heating boilers; scrubbers (parts of gas installations); regulating and safety accessories for gas apparatus; regulating and safety devices for water treatment and waste treatment apparatus; installations for waste reclamation (conversion into energy)
37
Installation, repair and maintenance of installations for purifying water, water supply, waste processing and energy production; installation, repair and maintenance installations for purifying gas and for storing gas; installation, repair and maintenance of installations for distributing energy in the form of gas, heat, electricity, cold or fuel; installation, repair and maintenance of apparatus for fermenting and digesting pollutants; installation, repair and maintenance of installations for waste and polluted water reclamation
40
Water treatment and waste treatment (processing); cleaning of industrial and urban effluent; reclamation of waste and polluted water; sorting of waste and effluent (processing); processing of waste and polluting products into energy; production of energy into biogas, natural gas, fuel gas, hydrogen; production of energy in the form of heat, cold, electricity or fuel; production of mechanical energy; operations of installations for water treatment, for waste treatment and for energy production; information relating to water treatment, waste treatment and production of energy
42
Engineering studies and design of installations for cleaning water, for the treatment of waste and for the production of energy; engineering and appraisals concerning the treatment of water, the treatment of waste materials and the production of energy; development, rental, maintenance and updating of software for controlling water treatment, waste treatment and energy production installations; research and development of new products for others in the field of the environment and energy