4270001 Sewage screening plant and equipment 4270002 Grate cleaning appliances, automatic, effluent treatment 4270003 Presses, sewage screenings 4270004 Filter presses, effluent and sewage treatment 4270005 Sewage and effluent treatment plant, complete 4270006 Pumping systems, sewage treatment plant 4270007 Water intake screen cleaning equipment for hydroelectric power stations 4270010 Comminutors, sewage treatment 4270011 Pumps, disintegrator, effluent treatment 4270015 Tanks, effluent treatment 4270016 Digesters, anaerobic, effluent treatment 4270017 Degassing equipment, vacuum, for sewage and effluent plant 4270018 Activated sludge plant, effluent treatment 4270019 Sludge thickening plant, effluent treatment 4270020 Sludge extractors, effluent treatment 4270022 Sludge compacting equipment, effluent treatment 4270024 Sludge driers, effluent treatment 4270025 Centrifuges, effluent treatment 4270026 Hydrocyclones, effluent treatment 4270030 Incineration plant, sewage sludge 4270031 Biogas driers 4270032 Parts and accessories for sewage sludge treatment plant 4270034 Filter-beds, screening, for coarse solids, effluent treatment 4270035 Filter-beds, sand, for water treatment 4270036 Filtration equipment, water and effluent treatment 4270037 Water filtration equipment, activated carbon 4270042 Diffusers and aerators, effluent treatment 4270045 Flotation plant, effluent treatment 4270046 Flocculation plant and equipment, water and effluent treatment 4270047 Polymer solution preparation plant, water and sewage treatment 4270048 Surface skimmers, water treatment plant 4270049 Resin traps for pipes, water treatment 4270050 Evaporation plant, effluent treatment 4270052 Odour treatment plant, effluent treatment 4270053 Osmosis systems, water treatment 4270054 Sewage and effluent handling equipment, vacuum or compressed air operated 4270055 Reverse osmosis systems, water treatment
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