Electrochemical Bacterial Enrichment from Natural Seawater and Its Implications in Biocorrosion of Stainless-Steel Electrodes

被引:8
作者
Jose De la Fuente, Maria [1 ,5 ]
Daille, Leslie K. [2 ,5 ]
De la Iglesia, Rodrigo [2 ,5 ]
Walczak, Magdalena [3 ,5 ]
Armijo, Francisco [4 ,5 ]
Pizarro, Gonzalo E. [1 ,5 ]
Vargas, Ignacio T. [1 ,5 ]
机构
[1] Pontificia Univ Catolica Chile, Fac Ingn, Dept Ingn Hidraul & Ambiental, Vicuna Mackenna 4860, Santiago 7820436, Chile
[2] Pontificia Univ Catolica Chile, Fac Ciencias Biol, Dept Genet Mol & Microbiol, Portugal 49, Santiago 8330025, Chile
[3] Pontificia Univ Catolica Chile, Fac Ingn, Dept Ingn Mecan & Metalurgia, Vicuna Mackenna 4860, Santiago 7820436, Chile
[4] Pontificia Univ Catolica Chile, Fac Quim & Farm, Dept Quim Inorgan, Vicuna Mackenna 4860, Santiago 7820436, Chile
[5] Marine Energy Res & Innovat Ctr MERIC, Avda Apoquindo 2827, Santiago 7550268, Chile
关键词
microbial enrichment; overpotential; marine biocorrosion; stainless steel; MICROBIAL FUEL-CELLS; OXYGEN REDUCING BIOCATHODES; SP NOV; ELECTRICITY-GENERATION; COMMUNITY COMPOSITION; MARINE BACTERIUM; GEN; NOV; BIOFILMS; CORROSION; SYSTEMS;
D O I
10.3390/ma13102327
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Microbial electrochemical technologies have revealed the opportunity of electrochemical enrichment for specific bacterial groups that are able to catalyze reactions of interest. However, there are unsolved challenges towards their application under aggressive environmental conditions, such as in the sea. This study demonstrates the impact of surface electrochemical potential on community composition and its corrosivity. Electrochemical bacterial enrichment was successfully carried out in natural seawater without nutrient amendments. Experiments were carried out for ten days of exposure in a closed-flow system over 316L stainless steel electrodes under three different poised potentials (-150 mV, +100 mV, and +310 mV vs. Ag/AgCl). Weight loss and atomic force microscopy showed a significant difference in corrosion when +310 mV (vs. Ag/AgCl) was applied in comparison to that produced under the other tested potentials (and an unpoised control). Bacterial community analysis conducted using 16S rRNA gene profiles showed that poised potentials are more positive as +310 mV (vs. Ag/AgCl) resulted in strong enrichment for Rhodobacteraceae and Sulfitobacter. Hence, even though significant enrichment of the known electrochemically active bacteria from the Rhodobacteraceae family was accomplished, the resultant bacterial community could accelerate pitting corrosion in 316 L stainless steel, thereby compromising the durability of the electrodes and the microbial electrochemical technologies.
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页数:18
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