Anaerobic Biodegradation of Alternative Fuels and Associated Biocorrosion of Carbon Steel in Marine Environments
Anaerobic Biodegradation of Alternative Fuels and Associated Biocorrosion of Carbon Steel in Marine Environments
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DOI：
10.1021/acs.est.5b06388
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发表时间：
2016-05-03
影响因子：
11.4
通讯作者：
Sufllita, Joseph M.
中科院分区：
文献类型：
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作者：
Liang, Renxing;Aktas, Deniz F.;Sufllita, Joseph M.
太容易生物降解的燃料会加剧管道和储罐的穿壁点蚀，并导致无意的环境释放。我们测试了两种新兴海军生物燃料（camelina-JP5 和 Fischer-Tropsch-F76）的生物稳定性，以及它们在有或没有碳氢化合物降解硫酸盐还原菌的海水培养箱中加剧碳钢腐蚀的潜力。在培养中加入沉积物或阳性对照细菌，用不同的接种物刺激了类似的硫酸盐还原模式。然而，在使用亚麻荠-JPS [(57.2 +/- 2.2)-(80.8 +/- 8.1) mu M/天]或其与石油-JPS 的混合物(76.7 +/- 2.4 mu M/天)进行修改的孵化中发现硫酸盐还原率最高。仅在燃料改良孵化中检测到一系列代谢物证实烷基化苯烃通过已知的厌氧机制代谢。最重要的是，一般腐蚀（r(2) = 0.73）和点蚀（r(2) = 0.69）腐蚀与培养过程中硫酸盐的损失呈正相关。因此，不稳定燃料成分的厌氧生物降解与硫酸盐呼吸作用极大地促进了碳钢的生物腐蚀。虽然所有燃料都容易发生厌氧代谢，但应特别注意亚麻荠-JPS 生物燃料，因为其生物降解速度相对较快。我们建议谨慎使用这种生物燃料，并尽可能避免延长储存时间。
Fuels that biodegrade too easily can exacerbate through-wall pitting corrosion of pipelines and tanks and result in unintentional environmental releases. We tested the biological stability of two emerging naval biofuels (camelina-JP5 and Fischer-Tropsch-F76) and their potential to exacerbate carbon steel corrosion in seawater incubations with and without a hydrocarbon-degrading sulfate-reducing bacterium. The inclusion of sediment or the positive control bacterium in the incubations stimulated a similar pattern of sulfate reduction with different inocula. However, the highest rates of sulfate reduction were found in incubations amended, with camelina-JPS [(57.2 +/- 2.2)-(80.8 +/- 8.1) mu M/day] or its blend with petroleum-JPS (76.7 +/- 2.4 mu M/day). The detection of a suite of metabolites only in the fuel-amended incubations confirmed that alkylated benzene hydrocarbons were metabolized via known anaerobic mechanisms. Most importantly, general (r(2) = 0.73) and pitting (r(2) = 0.69) corrosion were positively correlated with sulfate loss in the incubations. Thus, the anaerobic biodegradation of labile fuel components coupled with sulfate respiration greatly contributed to the biocorrosion of carbon steel. While all fuels were susceptible to anaerobic metabolism, special attention should be given to camelina-JPS biofuel due to its relatively rapid biodegradation. We recommend that this biofuel be used with caution and that whenever possible extended storage periods should be avoided.