Hybrid soliwave technique for mitigating sulfate-reducing bacteria in controlling biocorrosion: a case study on crude oil sample

Microbiologically influenced corrosion (MIC) is among the common corrosion types for buried and deep-water pipelines that result in costly repair and pipeline failure. Sulfate-reducing bacteria (SRB) are commonly known as the culprit of MIC. The aim of this work is to investigate the performance of combination of ultrasound (US) irradiation and ultraviolet (UV) radiation (known as Hybrid soliwave technique, HyST) at pilot scale to inactivate SRB. The influence of different reaction times with respect to US irradiation and UV radiation and synergistic effect toward SRB consortium was tested and discussed. In this research, the effect of HyST treatment toward SRB extermination and corrosion studies of carbon steel coupon upon SRB activity before and after the treatment were performed using weight loss method. The carbon steel coupons immersed in SRB sample were exposed to HyST treatment at different time of exposure. Additionally, Field Emission Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy were used to investigate the corrosion morphology in verifying the end product of SRB activity and corrosion formation after treatment. Results have shown that the US irradiation treatment gives a synergistic effect when combined with UV radiation in mitigating the SRB consortium.

微生物诱导腐蚀（Microbiologically influenced corrosion, MIC）是埋地与深水管道常见的腐蚀类型之一，可造成高额修复成本并引发管道失效。硫酸盐还原菌（Sulfate-reducing bacteria, SRB）被公认为微生物诱导腐蚀的元凶。本研究旨在探究中试规模下超声（ultrasound, US）辐照与紫外（ultraviolet, UV）辐照联用技术（即混合声波复合技术，Hybrid soliwave technique, HyST）对硫酸盐还原菌的灭活性能。本研究测试并探讨了超声辐照、紫外辐照各自的不同反应时长，以及二者的协同效应对硫酸盐还原菌菌群的影响。采用失重法，本研究开展了HyST处理对硫酸盐还原菌的灭杀效果评估，以及处理前后碳钢试片在硫酸盐还原菌作用下的腐蚀行为研究：将浸泡于硫酸盐还原菌菌液中的碳钢试片，施加不同时长的HyST处理。此外，本研究采用场发射扫描电子显微镜（Field Emission Scanning Electron Microscopy, FESEM）结合能量色散X射线光谱仪（Energy Dispersive X-ray Spectroscopy, EDS）表征腐蚀形貌，以验证处理后硫酸盐还原菌的代谢终产物与腐蚀生成产物。结果表明，超声辐照与紫外辐照联用时可产生协同效应，能够有效抑制硫酸盐还原菌菌群的活性。