Environmental life cycle assessment of a galician cheese: San Simon da Costa

Cheese production has always been the standard way of preserving milk. This is the second most consumed dairy product in Spain (ca. 6.2 kg per year and person), with more than 100 different cheeses available in the market. However, only 26 types are labelled with a Protected Designation of Origin (PDO), a symbol of quality recognition. In this study, an environmental Life Cycle Assessment (LCA) was performed to identify and quantify the environmental impacts (cradle-to-grave perspective) derived from the manufacture of one of the most popular and traditional PDO Galician cheeses: San Simon da Costa cheese. The most critical steps throughout the chain were identified. As expected, milk production at the dairy farm is the main environmental hot-spot in all categories assessed, with contributions ranging from 63% to 89%. Both feed production (mainly fodder) and on-farm emissions derived from enteric fermentation and manure management were the highest contributing farming activities. Cheese making activities should also be considered, with emphasis on impacts associated with the smoking process, the heating system and wastewater treatment. The studied dairy factory has not implemented a system for whey recovery due to its small-scale production. Thus, whey waste mixed with the wastewater effluent is sent to the municipal wastewater treatment plant. Therefore, the valorisation of whey into whey powder was considered as an alternative for improvement. Using this process modification, it is possible to achieve reductions in the environmental profile of the PDO San Simon cheese of up to 15% in categories such as eutrophication. In addition, attention must be paid to the environmental loads of whey powder production arising from electricity and heating requirements.Antonio Vázquez is acknowledged for his thorough on-site data collection, as well as DaniBerto, a cheese producer, for its kind collaboration. Dr. S. González-García would like to express her gratitude to the Spanish Ministry of Education for financial support (Grant reference: EX2009-0740) for a Postdoctoral Research Fellowship carried out at the University of Aveiro (Portugal).publishe