Manufacturing activities generate various wastes. These are divided into two main categories: hazardous and non-hazardous wastes. Hazardous wastes include cutting fluids, various types of waste oil, paints and solvents, oily wastes, solid wastes, etc. Non-hazardous wastes include scrap metal, metal swarf, waste plastics, waste wood, domestic waste, cardboard, and paper waste. All Wärtsilä companies sort their waste according to local municipal regulations. Generally speaking, the main sorting categories are waste for recycling, waste for incineration, and waste for landfills.
Waste management in Wärtsilä has four aims, in their order of priority to:
Wärtsilä uses seawater for its engine and process cooling needs. In this case, the cooling water system is kept separate so that only heat is released into the natural water system. Wastewater is sewered and piped to the local wastewater treatment plant or treated on site before being discharged. If the effluent is not suitable for discharge, it is taken away for appropriate processing, for example to a hazardous waste treatment plant.
Several Wärtsilä subsidiaries have environmental permits that allow clean or properly treated water to be discharged into natural water bodies. Most of this discharge is clean cooling water, which is released back into local surface watercourse, releasing only heat.