Feed substrates influence biofilm formation on reverse osmosis membranes and their cleaning efficiency

Marka, Sowmya; Anand, S. K.

doi:10.3168/jds.2017-13249

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…The obtained data were consistent with the findings of Marka and Adand [15]. The authors found that during the processing of skimmed milk permeate, biofilms on reverse osmosis membranes formed faster than during processing of sweet whey.…”

Section: Resultssupporting

confidence: 91%

“…According to Marka and Anand, biofilms of sweet whey were less resistant to standard CIP washing than biofilms of skimmed milk. Noteworthily, these results were obtained in the study on reverse osmosis membranes, with the processing of raw materials lasting 48 hours and the washing conditions being different [15].…”

Section: Resultsmentioning

confidence: 81%

“…After 8 h, we observed the attachment of microbial cells to the glass surface and the beginning of their reproduction in all three types of raw materials. Apparently, this was the first stage of reversible attachment of microorganisms when they could be easily removed from the surface but could become the basis for further growth of biofilm [15].…”

Section: Resultsmentioning

confidence: 99%

“…Monolayers of this culture, smoother and flattened in shape, were found in whey biofilms. The atomic microscopy revealed that biofilms of skimmed milk permeate had the highest surface roughness among other biofilms [15].…”

Section: Introductionmentioning

confidence: 99%

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Modelling formation and removal of biofilms in secondary dairy raw materials

Ryabtseva

Tabakova

Храмцов

et al. 2021

Foods and Raw Materials

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Introduction. Microorganisms of dairy raw materials tend to adhere to the surfaces of processing equipment and form sustainable biofilms, which is a serious issue in the dairy industry. The goal of the present work was to investigate formation of biofilms on a glass surface in static model conditions, and removal of such biofilms by cleaning. Study objects and methods. The study objects were the permeates of skim milk, sweet whey and acid whey, as well as the biofilms formed and washings from glass slides. Biofilms were removed from the glass with detergents used in the dairy industry. Standard methods of determining microbiological and physicochemical properties were used to characterize the permeates. The biofilm structure and morphology of microorganisms participating in biofilm formation were investigated with a light spectroscopy. The efficiency of biofilm removal in a cleaning process was quantified with optical density of washings. Results and discussion. Biofilms in whey permeates formed slower compared to those in skimmed milk permeate during the first 24 h. Yeasts contributed significantly to the biofilm microflora in acid whey permeate throughout 5 days of biofilm growth. Well adhered biofilm layers were the most stable in skimmed milk permeate. The highest growth of both well and poorly adhered biofilm layers was observed in sweet whey permeate after 3–5 days. It was established that the primary attachment of microorganisms to a glass surface occurred within 8 h, mature multicultural biofilms formed within 48 h, and their partial destruction occurred within 72 h. Conclusion. The research results can be used to improve the cleaning equipment procedures in processing secondary dairy raw materials.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling formation and removal of biofilms in secondary dairy raw materials

Ryabtseva

Tabakova

Храмцов

et al. 2021

Foods and Raw Materials

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“…The cost for chemical expenses is related to control of membrane fouling, which decreases water permeate flux as the foulants deposit onto membranes and feed spacers during operation [43][44][45][46][47]. Membrane fouling may be classified into four types: organic fouling, particulate fouling, biological fouling, and inorganic fouling (scaling) [47][48][49]. Particulate fouling represents the deposition of aluminum silicate, clays, colloids, sand, and silt [47].…”

Section: Introductionmentioning

confidence: 99%

How RO membrane permeability and other performance factors affect process cost and energy use: A review

2019

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Reverse osmosis (RO) technology has progressed steadily over the last few decades. Those gains were achieved through improvements in both RO membrane element performance and energy recovery technologies. However, some recent literature indicates that RO membrane water permeability is approaching performance limits imposed by transport processes and thermodynamic constraints. This paper reviews how RO membrane element performance affects the cost of RO processes, especially the specific energy consumption. RO membrane performance encompasses water permeability, salt permeability, and other some characteristics of the RO element. This paper considers not only conventional RO processes, but also the recently proposed closed-circuit RO and batch RO processes. Even if the membrane water permeability increases, little additional effect is found when the membrane water permeability exceeds around 3 LMH/bar for seawater RO and 8 LMH/bar for brackish water RO in conventional single-stage RO. Increasing membrane water permeability has the potential to decrease membrane surface area and associated costs. A major limitation of most existing literature is that performance is evaluation on in terms of the initial operating conditions. Chronological changes, such as result from fouling, must also be considered to accurately validate how membrane element performance affects RO cost.

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