The microbial resistance of polymer dispersions and the efficacy of polymer dispersion biocides – A statistically validated method

Gillatt, John; Julian, Keith; Brett, Kornelia; Goldbach, Marc; Grohmann, Jörg; Heer, Beat; Nichols, Kristina; Roden, Kevin; Rook, Tony A.; Schubert, Tanja; Stephan, Ina

doi:10.1016/j.ibiod.2015.04.028

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…Regarding the EOR, a previous study found that the injected agents would be quickly degraded by microorganisms within a short distance before reaching oil-rich regions, which will reduce the efficiency of oil recovery . Therefore, researchers have attempted to achieve disinfection by adding microbiocides, but the disinfection efficiency has not been as good as expected. , An inadequate understanding of wellbore biofilms might be the major reason for this shortfall.…”

Section: Discussionmentioning

confidence: 99%

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Community Distribution of Biofilms along a Vertical Wellbore in a Deep Injection Well during Petroleum Production

et al. 2021

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In petroleum production, microbial investigations are essential for microbial-induced corrosion (MIC) control and enhanced oil recovery (EOR) processes. It is suggested that microorganisms can attach to the inner wall of pipes as biofilms, which are more stable and could cause more serious corrosion than planktonic microorganisms in the water phase. At present, research on the biofilms during oil production is mainly focused on the surface pipelines, while few reports have directly investigated biofilms in vertical deep wells. Therefore, in this study, wellbore biofilms were sampled during well workover from several well-tube segments corresponding to different original depths (approximately 0, 840, and 1330 m). The injected water was sampled as well. The results of the 16S rRNA gene library sequencing showed that the biofilms and water-phase communities were distinct (dissimilarity of 0.56–0.64), although they shared 64 OTUs. At the phylum level, the relative abundance of Proteobacteria was 74.65% in the water phase and only 7.86–27.41% in the biofilms. The dominant phylum, Firmicutes, was 6.03–41.21% in the three biofilms, while only 1.16% in the water phase. With increasing depth, the biofilm communities became more diverse (Shannon index of 3.43–4.21), more anaerobic, and more thermophilic possibly due to the depleting oxygen and increasing temperature in samples from the deeper well. For instance, the relative abundance of anaerobes (archaea and strict anaerobic bacteria) in biofilms increased from 18.32 to 40.53%. Thermophilic bacteria (such as Kosmotoga) increased from 6.65 to 15.82%. Among methanogens, hydrogenotrophic genera (such as Methanobacterium and Methanolinea) increased from 3.66 to 9.68%. This study revealed the structural differences between water-phase and biofilm communities in the well, and the depth-dependent distribution of the biofilm communities. These results improved the understanding of microbial ecology in wellbores, which will benefit microbial activity control measures applied in oil production processes, including MIC and oil recovery.

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Section: Discussionmentioning

confidence: 99%

“…52 Therefore, researchers have attempted to achieve disinfection by adding microbiocides, but the disinfection efficiency has not been as good as expected. 53,54 An inadequate understanding of wellbore biofilms might be the major reason for this shortfall.…”

Section: Discussionmentioning

confidence: 99%

Community Distribution of Biofilms along a Vertical Wellbore in a Deep Injection Well during Petroleum Production

et al. 2021

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“…Disinfectants also known as biocides are used to protect human welfare which are formulation containing one or more active substance that control harmful organisms. [15]. Protection and prevention are the essential purposes of biocides.…”

Section: Discussionmentioning

confidence: 99%

Antibacterial Efficiency of Benzalkonium Chloride Base Disinfectant According To European Standard 13727, Chemical Analysis and Validation Studies

Yıldırım¹,

Çelenk²

2016

CBU J of Sci

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This study was aimed to provide principle of the chemical analyses, antibacterial efficiency test and validation procedures of the most commonly used benzalkonium chloride (BAC) base disinfectant as a biocide. Disinfectant which comprised 20 % BAC concentration was used as a prototype product and active substance was verified with chemical analysis. Additionally, BAC homologs (n-C12 and n-C14) in the product were identified by LC-MS/MS method. The validation results also confirmed the reliability of the chromatographic method. After active substance was confirmed, microbiological efficacy test was carried out against E. coli K12, S. aureus, P. aerugionas and E. hirae. Both bacterial strains were showed more than 5 logaritmic reduction after exposure for 1 min. to test product. The aim of this study was to evaluate the validation of chemical analysis of the test product by LC-MS/MS which is developed chromatographic method. Moreover the present study highlights that the antibacterial efficacy of BAC based disinfectant according to European National (EN) Standard. These results exhibited that chemical and microbiological analyses were significantly important before manufacturing and marketing processes of the biocidal products. This was the first study on biocides analysis which was conducted according to the European standard.

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“…Cellulose is usually broken down to glucose through an enzyme system known as cellulase complex. The reduction in the degree of polymerization of these thickeners results in the loss of paint viscosity during storage [89,90]. Microorganisms' cellulolytic activity can be assessed in an in vitro test based on the formation of clear zone around the colony growing in a culture medium supplemented with cellulose and evidenced with the use of congo red dye [91].…”

Section: Biodeterioration Of Waterborne Paintmentioning

confidence: 99%

Waterborne functional paints to control biodeterioration

Bellotti

Deyá

Zarras³

et al. 2020

Handbook of Waterborne Coatings

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The microbial resistance of polymer dispersions and the efficacy of polymer dispersion biocides – A statistically validated method

Cited by 6 publications

References 8 publications

Community Distribution of Biofilms along a Vertical Wellbore in a Deep Injection Well during Petroleum Production

Community Distribution of Biofilms along a Vertical Wellbore in a Deep Injection Well during Petroleum Production

Antibacterial Efficiency of Benzalkonium Chloride Base Disinfectant According To European Standard 13727, Chemical Analysis and Validation Studies

Waterborne functional paints to control biodeterioration

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