This paper presents a comparative analysis of feed phosphates production processes using the Life Cycle Assessment (LCA) methodology and process analysis in the quantification of cumulated calculation. Three feed phosphates production processes were compared: a modified thermal process and two different low temperature endothermic units (one working in the "Bonarka" Inorganic Works (BIW) in Cracow and the other in the Phosphoric Fertilizers Works (PFW) "Fosfory" in Gdańsk). The LCA results indicated that the most advantageous technology is the feed phosphates production unit in "Fosfory". It was shown that LCA can be an efficient instrument for evaluating environmental impact, though it should be compared with other estimation methods.

In the paper, the research on the process of optimizing the carbon footprint to obtain the low-carbon products is presented. The optimization process and limits were analyzed based on the CFOOD project co-financed by the Polish Research and Development Agency. In the article, the carbon footprint (CF) testing methods with particular emphasis on product life cycle assessment (LCA) are discussed. The main problem is that the energy received from the energy-meters per the production stage is not directly represented in the raw data set obtained from the factory because many production line machines are connected to a single measurement point. In the paper, we show that in some energy-demanding production stages connected with cooling processes the energy used for the same stage and similar production can differ even 25-40%. That is why the energy optimization in the production can be very demanding.