Closed and controlled-circulation environments can favor microbial proliferation on surfaces and biofilm formation in the absence of an active antimicrobial barrier, posing risks to astronaut crews, air filtration systems, and sensitive equipment. This work proposes the use of shrimp-industry waste in Guatemala as a source of chitin for chitosan production. Shrimp exoskeletons are often discarded in landfills, rivers, and lakes, contributing to organic pollution despite Guatemala’s abundant marine biomass.The objective is to develop a chitosan coating for spacecraft air filters, which may be susceptible to colonization by space biofilms. Chitosan is a biopolymer with antimicrobial, biocompatible, and non-toxic properties. Previous research has demonstrated that chitosan coatings on titanium alloys can inhibit the growth of Staphylococcus aureus and Escherichia coli and disrupt biofilm formation. Chitosan also has applications in wastewater treatment, cell immobilization, and enhancing the antimicrobial activity of drugs.The proposed method involves immersing the air filter material in a chitosan solution through a dip-coating process, followed by controlled drying to form a uniform film over the fibers. Zinc oxide nanoparticles may also be incorporated to enhance antibacterial activity. The resulting material should be evaluated under extreme space-environment conditions, including microgravity and radiation, to assess coating durability and effectiveness.This proposal aims to extend the useful life of spacecraft air filtration systems, reduce contamination risks from space biofilms, and contribute to the sustainability of long-duration missions. It also promotes a functional biomaterial based on a circular economy approach, creating social benefits for Guatemalan coastal communities that supply the raw material and supporting Sustainable Development Goal 14 (SDG 14), Life Below Water.