Mexican biomasses valorization through pyrolysis process: Environmental and costs analysis.

• LCA of the castor husk, coffee pulp and Pinus sawdust pyrolysis process was studied. • The separator has an important role in environmental damage in almost all categories. • The pyrolysis process using coffee pulp has the highest environmental impact. • Energy consumption and air emissions are mainly responsible for environmental impacts. • It was demonstrated that the pyrolysis of the coffee pulp is economically viable. Biomasses valorization by pyrolysis is a good option for reducing environmental problems. In this study, the environmental performance of three Mexican biomass valorizations (castor husk, coffee pulp and Pinus sawdust) by the pyrolysis was compared. The environmental impacts of all equipment involved in pyrolysis were evaluated. In addition, the financial viability of pyrolysis technology of coffee pulp was studied. The biomass with the lowest impact for all the selected categories was the Pinus sawdust, followed by castor husk and coffee pulp. The GWP category had values greater than 700 kg CO 2 eq for all the biomass studied. GWP category is caused by the emissions, mainly due to the high amounts of CH 4 and CO 2 released for all the studied biomasses. Furthermore, the equipment with the greatest impact are the separator, the pyrolyzer and the cyclone. Finally, it was observed that even the least favorable biomass with the environment is viable from a financial point of view. [ABSTRACT FROM AUTHOR]