InputThe input of thelife cycle inventory analysis covers the air and water required.
AirrequirementsThe air requirement is mostlyrelated to the need for oxygen when burning the fossil resources to get energy.The tire of a car’s use phase uses the largest part of overall air consumptionin the life of a tire. The other parts of a tire’s life are: raw materials,extraction, production and transport (Continental, 1999).Waterrequirements The water consumption exists ofcooling water, process water and service water. Cooling water normally goesinto circuits that’s why they can be used over a long period of time. The waterconsumption in combination with the obtaining raw materials for the carbon blacktires under consideration here is as follows: around 63% for the manufacture ofsynthetic rubber, around 18% to obtain rayon, around 3.1% for the manufactureof natural rubber, around 5.6% for the production of steel and around 6.
5% forthe manufacture of chemicals (Continental, 1999). OutputThe output of the life cycle inventoryanalysis is made up of the atmospheric emissions, emissions into water, andoverburden waste. Atmosphericemissions Atmospheric emissions arepersistent for the biggest part by the output of carbon dioxide. The left overscontain carbon monoxide and water vapor.
Other emissions are methane, nitrogenoxide, volatile organic hydrocarbons but methane, sulfur dioxide, ammonia, nitrousoxide and dust are excluded (Environ, 2002). Of all the phases in the life of a tire, thecar use phase is the reason for a big negative impact on the atmosphere. Thisnegative impact is almost entirely caused by the carbon dioxide which isreleased when the car is being used. Carbon monoxide makes up around 1.2% of thenegative impact on the atmosphere in the use phase. The other phases likeobtaining raw materials for the tire and transport have less influence onatmospheric emissions. Dust is produced almost entirelyin the use phase and contains mainly particles of diverse sizes which are producedby tire abrasion. The particles get into the air and slowly fall to the ground.
Water vapor is released when the tire is manufactured. It is made because ofcooling processes in the course of the manufacture of the rubber mixture aswell as of components (Continental, 1999).