Biodeterioration of asbestos cement by siderophore-producing Pseudomonas

Since the ban on use of asbestos due to its carcinogenic properties, removal cement, representing major asbestos-containing waste, has proven be a challenge in most industrial countries. Asbestos-containing products are mainly disposed landfills and have remained untreated. Bioremediation involving bacteria previously reported ability Pseudomonas aeruginosa release iron from flocking waste through siderophore-driven mechanism. We examined involvement siderophore-producing biodeterioration cement. Iron magnesium solubilization were evaluated by specific mutants. The absence one two siderophores affected extraction, whereas equivalent dissolution as that control was observed siderophore. Both pyoverdine pyochelin biosynthesis repressed presence suggesting bioavailability waste. compared efficiency various pyoverdines scavenge cement revealed all pyoverdines. Pyoverdines efficient extracted continuously, with no evident extraction limit, long-term weathering experiments these optimization pyoverdine-asbestos may allow development bioremediation process avoid disposal such landfills.