Purification Water 3 Air 1 Air conditioning 1 Air-compressors 1 Ash disposal 1 Bearings (Machinery) 1 mere ... Biological decontamination 1 Boilers 1 Cleaning 1 Combustion 1 Condensers (Steam) 1 Condensers (Vapors and gases) 1 Cooling towers 1 Corrosion and anti-corrosives 1 Decontamination (from gases, chemicals, etc.) 1 Diesel motor 1 Electricity 1 Environmental aspects 1 Environmental engineering 1 Environmental protection 1 Equipment and supplies 1 Fans 1 Fire prevention 1 Fuel 1 Gas-turbines 1 Industrial equipment 1 Lubrication and lubricants 1 Nanofiltration 1 Nanostructured materials 1 mindre ...