Biofilm evolution in the pretreatment line of a reverse osmosis system

Dionisio-Ruiz, E.; Pérez, J. M.; Plaza, F.; Garralón, G.; Garralón, A.; Gómez, M.A.

doi:10.1016/j.desal.2014.01.024

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…The intermittent chlorine washing reduces the biofilm by removing the biofilm that has formed on the membrane. The microorganisms and biofilm fragments, which detached from the biofilm during intermittent chlorine washing create an increased risk of biofilm formation on RO membrane (Dionisio-Ruiz et al, 2014). The intermittent washing with 1 mg/L of the free chlorine, in this case, seemed to be an extremely insufficient condition which aids instead of reduce biofilm formation.…”

Section: Biofilm Formation Control By Continuous Washing and Intermitmentioning

confidence: 83%

“…On the other hand, the ΔFI by intermittent washing every 12 h was 454, and was the same for the control experiment. It has been reported that continuous chlorination enables better reduction of total aerobic bacteria than intermittent chlorination (Dionisio-Ruiz et al, 2014). ΔFI before chlorine washing after 48 h was 864.…”

Section: Biofilm Formation Control By Continuous Washing and Intermitmentioning

confidence: 94%

“…In a study by Fujiwara et al, 2008, when the required minimum chlorine concentration and injecting time of intermittent chlorine treatment based on the experiments of the growth and sterilization rates of microorganisms in seawater of Middle East were simulated, the operational results proved that intermittent chlorine treatment was the most effective chlorine injection mode to achieve best RO performance for desalination. The reduction of biofilm by continuous or intermittent shock chlorination of seawater for the pretreatment of RO system was evaluated in other studies (Dionisio-Ruiz et al, 2014. However, the intermittent shock chlorination every 15 days at 1 mg/L of residual free chlorine for 2 h of exposure time could not reduce the biofilm formation, and improvement of the application method (higher frequency or different dosage) was suggested to prevent the development of the biofilms on the RO membranes (Dionisio-Ruiz et al, 2014).…”

Section: Chapter 4: Hypochlorite Washing Studies For Biofilm Formatiomentioning

confidence: 99%

“…The reduction of biofilm by continuous or intermittent shock chlorination of seawater for the pretreatment of RO system was evaluated in other studies (Dionisio-Ruiz et al, 2014. However, the intermittent shock chlorination every 15 days at 1 mg/L of residual free chlorine for 2 h of exposure time could not reduce the biofilm formation, and improvement of the application method (higher frequency or different dosage) was suggested to prevent the development of the biofilms on the RO membranes (Dionisio-Ruiz et al, 2014). The microorganisms, which could not be reduced completely during pretreatment most likely form biofilms on the RO membrane.…”

Section: Chapter 4: Hypochlorite Washing Studies For Biofilm Formatiomentioning

confidence: 99%

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Effect of coexisting metal ions on the degradation of polyamide reverse osmosis membrane by hypochlorite treatment

et al. 2016

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A Dissertation submitted to the Graduate School of Engineering HIROSHIMA UNIVERSITY By CERVINIA VELASCO MANALO In partial fulfillment of the requirements for the degree of Doctor of Engineering March 2016 Evaluation of Biofouling and Its Control by Hypochlorite on Polyamide Reverse Osmosis Membranes ( RO ) Cervinia V. Manalo The following people and organizations had been invaluable towards the completion of this doctorate degree and during the course of this academic journey, and for that I would like to express my sincerest and heartfelt gratitude: My professors and mentors from the Green Process Engineering Laboratory: Dr. Wataru Nishijima for his guidance and immense knowledge during the time of my research and for his valuable insights and efforts during the preparation of my papers; Dr. Satoshi Nakai, my adviser, for all the constructive opinions and advices, for his significant support during my applications for scholarship grants, and for his constant push in making me accomplish and finish this degree on time; Dr. Tetsuji Okuda for all his help during my application as a researcher and as a graduate student, for his continued guidance during my experiments and research, for ensuring my financial support as a part-time research assistant (RA) during my stay here in Japan, and for his care and kindness; My review committee, Dr. Toshinori Tsuru, Dr. Tomohisa Yoshioka, and Dr. Wataru Nishijima for their challenging questions and insightful comments that helped me write a better dissertation, for the constant encouragements, and for rendering their time and support despite the time constraints during my preliminary and final defense; CREST (Core Research for Evolutionary Science and Technology) under the project "Development of ROBUST reverse osmosis (RO)/nanofiltration (NF) membranes for various types of water sources and the Department of Chemical Engineering for the financial support given to me as a part-time RA, which enabled me to pursue my studies while living in Saijo;The scholarship grants awarded by Higashi-Hiroshima International Soroptomist

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Section: Biofilm Formation Control By Continuous Washing and Intermitmentioning

confidence: 83%

Section: Biofilm Formation Control By Continuous Washing and Intermitmentioning

confidence: 94%

Section: Chapter 4: Hypochlorite Washing Studies For Biofilm Formatiomentioning

confidence: 99%

Section: Chapter 4: Hypochlorite Washing Studies For Biofilm Formatiomentioning

confidence: 99%

See 2 more Smart Citations

Effect of coexisting metal ions on the degradation of polyamide reverse osmosis membrane by hypochlorite treatment

et al. 2016

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“…The presence of different concentrations of juice as variations in the nutritional input allows the recovery of cells that had survived the disinfection process. As reported by several authors Dionisio-Ruiz et al, 2014), biofilms can develop even after the application of chlorination, which is a routinely process. In the case of Rojas-Serrano, Marín, Pérez, and Gómez (2015) when performing autopsies of UF membranes with a pre-treatment of coagulation, they observed that the affluent with organic matter acted as a protective barrier of biofilms.…”

Section: Accepted Manuscriptmentioning

confidence: 73%

Disinfection efficacy over yeast biofilms of juice processing industries

Tarifa

Lozano

Brugnoni

2018

Food Research International

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Membrane separation systems represent a hot - spot for biofilm formation in juice industries. Sodium hypochlorite (NaOCl) has been traditionally the disinfectant of choice; however, its effectiveness over well-established biofilms is limited. In this work the study of biofilm formation on ultrafiltration membranes was proposed. The effectiveness of cleaning and disinfection procedures commonly used in juice industry was tested on the removal and killing of cells. The species used (Rhodotorula mucilaginosa, Candida krusei, Candida kefyr and Candida tropicalis) were isolated from ultrafiltration modules of a clarified apple juice industry. Industrial concentrations of NaOCl (200mgCL∙L) showed to be effective against planktonic cultures with >4 log reductions, whereas their overall efficiency against adhered cells was smaller. Recovery of viable cell counts to initial numbers was evidenced regardless of the time of colonization. The topography of the surface showed to have an impact on the efficiency of the disinfectant, presenting membranes smaller log reductions than stainless steel (~1.09-1.53logCFU). At 200mgCl∙L only membrane's cross flow recovery was reached with no long-term effect over the attached cells. The overall results demonstrated the recalcitrance of these biofilms to typical cleaning and disinfection process which may confer them with a selective advantage.

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Techniques and Technologies

2015

Reverse Osmosis

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Biofilm evolution in the pretreatment line of a reverse osmosis system

Cited by 13 publications

References 19 publications

Effect of coexisting metal ions on the degradation of polyamide reverse osmosis membrane by hypochlorite treatment

Effect of coexisting metal ions on the degradation of polyamide reverse osmosis membrane by hypochlorite treatment

Disinfection efficacy over yeast biofilms of juice processing industries

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