Electrochemical corrosion behavior and mechanism of iron-oxidizing bacteria <i>Thiobacillus ferrooxidans</i> from acid mine drainage on Q235 carbon steel

Lin, Laikuang; Tsou, Chi‐Hui; Dou, Baojie; Yan, Shisen; Zeng, Ying; Gong, Ming

doi:10.1039/d2nj04013a

Cited by 4 publications

(2 citation statements)

References 47 publications

(58 reference statements)

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“…In contrast, Geothermobacter ASVs decreased in response to all three inhibitors in Set 3 (log2 fold change = −2.0 ± 1.8) but increased only in the zinc phosphate-appended microcosms in Sets 1 (0.52) and 2 (2.2 ± 0.55). Geothermobacter and Thiobacilllus are FeRB ( 68 , 69 ) that also have the potential to outcompete SRB-induced corrosion, while Desulfobulbus and Desulfosporosinus are SRB linked to steel pipe corrosion ( 72 , 74 ). Leptothrix and Pseudomonas ASVs had the most variable responses to treatments.…”

Section: Resultsmentioning

confidence: 99%

“…ASVs were subsetted to include only those that were present in each of the triplicate microcosms. Among those, any classified as genera associated with waterborne pathogens ( Mycobacterium [ 57 ] , Legionella [ 58 ] , Arcobacter [ 59 ] , and Pseudomonas [ 60 ]) and pipe corrosion ( Leptothrix [ 61 ] , Pseudomonas [ 62 , 63 ] , Shewanella [ 64 , 65 ] , Sulfuricurvum [ 66 ] , Acidithiobacillus [ 67 ] , Geothermobacter [ 68 ] , Thiobacillus [ 69 ] , Geobacter [ 70 ] , Desulfomicrobium [ 71 ] , Desulfobulbus [ 72 ] , Sulfurospirillum [ 73 ] , and Desulfosporosinus [ 74 ]) were analyzed. Treatment response was estimated as the log2 fold change between the mean relative abundances of genera in treatment microcosms to controls on day 7 (Tables S6 and S7).…”

Section: Methodsmentioning

confidence: 99%

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Impact of corrosion inhibitors on antibiotic resistance, metal resistance, and microbial communities in drinking water

Kimbell,

LaMartina,

Kohls

et al. 2023

mSphere

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Corrosion inhibitors, including zinc orthophosphate, sodium orthophosphate, and sodium silicate, are commonly used to prevent the corrosion of drinking water infrastructure. Metals such as zinc are known stressors for antibiotic resistance selection, and phosphates can increase microbial growth in drinking water distribution systems (DWDS). Yet, the influence of corrosion inhibitor type on antimicrobial resistance in DWDS is unknown. Here, we show that sodium silicates can decrease antibiotic resistant bacteria (ARB) and antibiotic-resistance genes (ARGs), while zinc orthophosphate increases ARB and ARGs in source water microbial communities. Based on controlled bench-scale studies, zinc orthophosphate addition significantly increased the abundance of ARB resistant to ciprofloxacin, sulfonamides, trimethoprim, and vancomycin, as well as the genes sul1 , qac EΔ1, an indication of resistance to quaternary ammonium compounds, and the integron-integrase gene intI 1. In contrast, sodium silicate dosage at 10 mg/L resulted in decreased bacterial growth and antibiotic resistance selection compared to the other corrosion inhibitor additions. Source water collected from the drinking water treatment plant intake pipe resulted in less significant changes in ARB and ARG abundance due to corrosion inhibitor addition compared to source water collected from the pier at the recreational beach. In tandem with the antibiotic resistance shifts, significant microbial community composition changes also occurred. Overall, the corrosion inhibitor sodium silicate resulted in the least selection for antibiotic resistance, which suggests it is the preferred corrosion inhibitor option for minimizing antibiotic resistance proliferation in DWDS. However, the selection of an appropriate corrosion inhibitor must also be appropriate for the water chemistry of the system (e.g., pH, alkalinity) to minimize metal leaching first and foremost and to adhere to the lead and copper rule. IMPORTANCE Antibiotic resistance is a growing public health concern across the globe and was recently labeled the silent pandemic. Scientists aim to identify the source of antibiotic resistance and control points to mitigate the spread of antibiotic resistance. Drinking water is a direct exposure route to humans and contains antibiotic-resistant bacteria and associated resistance genes. Corrosion inhibitors are added to prevent metallic pipes in distribution systems from corroding, and the type of corrosion inhibitor selected could also have implications on antibiotic resistance. Indeed, we found that sodium silicate can minimize selection of antibiotic resistance while phosphate-based corrosion inhibitors can promote antibiotic resistance. These findings indicate that sodium silicate is a preferred corrosion inhibitor choice for mitigation of antibiotic resistance.

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