Performance assessment of oxidants as a biocide for biofouling control in industrial seawater cooling towers

Al‐Bloushi, Mohammed; Saththasivam, Jayaprakash; Al-Sayeghc, Sari; Jeong, Sanghyun; Ng, Kim Choon; Amy, Gary L.; Leiknes, Tor Ove

doi:10.1016/j.jiec.2017.10.015

Cited by 22 publications

(16 citation statements)

References 20 publications

(22 reference statements)

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“…In comparison, QQ enzymes that degrade extracellular QS signals are viewed as imposing less of a burden on cellular metabolism (Fetzner, 2015), and hence, they minimize the development of resistance toward these greener inhibitory agents. In most instances, QQ enzymes or bacteria with enzymatic activity from marine sources (Huang et al, 2012; Mayer et al, 2015; Tang et al, 2015; Liu et al, 2017; Rehman and Leiknes, 2018) were demonstrated for their efficiencies to quench QS in only minimal or nutrient medium, which deviate significantly from conditions in marine industrial systems such as seawater desalination plants (salinity: 46,400 ppm, temperature: 22–33°C, and pH 8.1–8.3) (Khawaji et al, 2007) and cooling towers (e.g., salinity: >35,000 ppm, and temperature 32–48°C) (Al-Bloushi et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Discovering, Characterizing, and Applying Acyl Homoserine Lactone-Quenching Enzymes to Mitigate Microbe-Associated Problems Under Saline Conditions

et al. 2019

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Quorum quenching (QQ) is proposed as a new strategy for mitigating microbe-associated problems (e.g., fouling, biocorrosion). However, most QQ agents reported to date have not been evaluated for their quenching efficacies under conditions representative of seawater desalination plants, cooling towers or marine aquaculture. In this study, bacterial strains were isolated from Saudi Arabian coastal environments and screened for acyl homoserine lactone (AHL)-quenching activities. Five AHL quenching bacterial isolates from the genera Pseudoalteromonas, Pontibacillus , and Altererythrobacter exhibited high AHL-quenching activity at a salinity level of 58 g/L and a pH of 7.8 at 50°C. This result demonstrates the potential use of these QQ bacteria in mitigating microbe-associated problems under saline and alkaline conditions at high (>37°C) temperatures. Further characterizations of the QQ efficacies revealed two bacterial isolates, namely, Pseudoalteromonas sp. L11 and Altererythrobacter sp. S1-5, which could possess enzymatic QQ activity. The genome sequences of L11 and S1-5 with a homologous screening against reported AHL quenching genes suggest the existence of four possible QQ coding genes in each strain. Specifically, two novel AHL enzymes, AiiA S1-5 and Est S1-5 from Altererythrobacter sp. S1-5, both contain signal peptides and exhibit QQ activity over a broad range of pH, salinity, and temperature values. In particular, AiiA S1-5 demonstrated activity against a wide spectrum of AHL molecules. When tested against three bacterial species, namely, Aeromonas hydrophila, Pseudomonas aeruginosa , and Vibrio alginolyticus , AiiA S1-5 was able to inhibit the motility of all three species under saline conditions. The biofilm formation associated with P. aeruginosa was also significantly inhibited by AiiA S1-5 . AiiA S1-5 also reduced the quorum sensing-mediated virulence traits of A. hydrophila, P. aeruginosa , and V. alginolyticus during the mid and late exponential phases of cell growth. The enzyme did not impose any detrimental effects on cell growth, suggesting a lower potential for the target bacterium to develop resistance over long-term exposure. Overall, this study suggested that some QQ enzymes obtained from the bacteria that inhabit saline environments under high temperatures have potential applications in the mitigation of microbe-associated problems.

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Section: Discussionmentioning

confidence: 99%

Discovering, Characterizing, and Applying Acyl Homoserine Lactone-Quenching Enzymes to Mitigate Microbe-Associated Problems Under Saline Conditions

et al. 2019

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“…Therefore, seawater circulation cooling technology is currently attracting increased attention. In coastal areas, using seawater instead of freshwater as circulating cooling water (including in seawater cooling tower applications) can not only relieve the pressure of marine thermal pollution but could also be valuable in solving the freshwater shortage problem [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer performance and exergy performance evaluation of seawater cooling tower considering different inlet parameters

Hou

et al. 2022

THERM SCI

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Cooling towers are important components within recirculating cooling water systems. Due to a shortage of freshwater resources, seawater cooling towers are widely used both in manufacturing and everyday life. This paper researches the mechanical draft counterflow wet seawater cooling tower (MDCWSCT), and establishes and verifies a detailed thermal performance calculation model. Referring to the second law of thermodynamics, the heat and mass transfer performance and exergy performance of the seawater cooling tower were studied. The effects of salinity, inlet air speed, and air wet-bulb temperature on the cooling efficiency, thermal efficiency, and exergy efficiency were analyzed. The results show that compared to the air wet-bulb temperature, changes in air speed have more influence on cooling and thermal efficiency under the study conditions. Moreover, the air wet-bulb temperature is the significant parameter affecting exergy efficiency. With an increase in salinity, the cooling, thermal, and exergy efficiency are about 2.40-8.25 %, 1.06-3.09 %, and 2.47-7.73 % lower than that of freshwater, respectively, within an air speed of 3.1-3.6 m/s. With an increase in salinity, the cooling, thermal, and exergy efficiency are about 2.28-8.47 %, 1.03-3.37 %, and 2.44-7.99 % lower than that of freshwater, respectively, within an air wet-bulb temperature of 25-27 ?. Through the exergy analysis of the seawater cooling tower, it is obvious that the heat and mass transfer performance and exergy performance can be improved by selecting the optimum operating conditions and appropriate packing specifications.

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“…The standard biofouling control methods consist of dosage of biocides such as sodium hypochlorite, chlorine dioxide or bromine in the cooling systems (Al-Bloushi et al 2018;Pinel et al 2020). Although, these chemicals considerably slow down the build-up of biofilms by deactivating planktonic bacterial cells, they cannot completely prevent biofilm formation and have little curative action.…”

Section: Introductionmentioning

confidence: 99%

“…In Europe, most CTs are operated with freshwater (e.g. ground or surface water), causing less damage to the process than seawater, which is frequently used, for example, in the Middle-East (Al-Bloushi et al 2018). In this study, seawater reverse osmosis (SWRO) permeate was selected as a reference feed water for three parallel pilot-scale CTs due to its ultra-low content of the elements and nutrients required for microbial growth: RO permeate water has one of the highest water qualities achievable.…”

Section: Introductionmentioning

confidence: 99%

Effect of phosphate availability on biofilm formation in cooling towers

et al. 2020

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Phosphate limitation has been suggested as a preventive method against biofilms. P-limited feed water was studied as a preventive strategy against biofouling in cooling towers (CTs). Three pilot-scale open recirculating CTs were operated in parallel for five weeks. RO permeate was fed to the CTs (1) without supplementation (reference), (2) with supplementation by biodegradable carbon (P-limited) and (3) with supplementation of all nutrients (non-P-limited). The P-limited water contained 10 mg PO 4 l À1. Investigating the CT-basins and coupons showed that P-limited water (1) did not prevent biofilm formation and (2) resulted in a higher volume of organic matter per unit of active biomass compared with the other CTs. Exposure to external conditions and cycle of concentration were likely factors that allowed a P concentration sufficient to cause extensive biofouling despite being the limiting compound. In conclusion, phosphate limitation in cooling water is not a suitable strategy for CT biofouling control.

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Performance assessment of oxidants as a biocide for biofouling control in industrial seawater cooling towers

Abstract: Industrial and Engineering Chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work

Cited by 22 publications

References 20 publications

Discovering, Characterizing, and Applying Acyl Homoserine Lactone-Quenching Enzymes to Mitigate Microbe-Associated Problems Under Saline Conditions

Discovering, Characterizing, and Applying Acyl Homoserine Lactone-Quenching Enzymes to Mitigate Microbe-Associated Problems Under Saline Conditions

Heat and mass transfer performance and exergy performance evaluation of seawater cooling tower considering different inlet parameters

Effect of phosphate availability on biofilm formation in cooling towers

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