Bioengineering report: Fouling biofilm development: A process analysis

Characklis, William G.

doi:10.1002/bit.260230902

Cited by 346 publications

(85 citation statements)

References 24 publications

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“…Microorganisms residing on the surface of pipes may reside in fluid with much higher velocities than examined here. 42 An increase in microbial uptake with fluid motion can be an important competitive advantage for attached cells in biological wastewater treatment reactors. In activated sludge reactors, long detention times of cells imply low growth rates but do not require low uptake rates of easily degraded soluble organics.…”

Section: Discussionmentioning

confidence: 99%

Increased mass transfer to microorganisms with fluid motion

Logan

Dettmer

1990

Biotech & Bioengineering

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The effect of fluid flow and laminar shear on bacterial uptake was examined under conditions representative of the fluid environment of unattached and attached cells in wastewater treatment bioreactors. Laminar shear rates below 50 s(-1) did not increase leucine uptake by suspended cultures of Zoogloea ramigera. However, leucine uptake by cells fixed in a flow field of approximately 1 mm s(-1) was 55-65% greater than uptake by suspended cells. Enhanced microbial uptake with advective motion is consistent with mass transfer rates calculated using Sherwood number correlations. Advective flow increases microbial uptake by increasing collisions between substrate molecules and cells through compression of the concentration boundary layer surrounding a cell. The rate of leucine uptake suggests that binding proteins used to transport leucine into the cell can occupy approximately 1% of the cell surface area.

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Section: Discussionmentioning

confidence: 99%

Increased mass transfer to microorganisms with fluid motion

Logan

Dettmer

1990

Biotech & Bioengineering

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“…Solid surfaces, when exposed to sea water, undergo a series of changes leading to the generation of a complex layer formed as a result of adhesion by marine organisms, mainly consisting of microbial slimes, diatoms, barnacles, tunicates, bryozoans and spores of marine algae (Rasmussen and Østgaard 2003;Bhosale et al 2002;Elvers and Lappin-Scott 2000;John et al 1999;Abarzua et al 1999;Abarzua and Jakubowski 1995;Mary et al 1993;Szewzyk et al 1991;Henschell and Cook 1990;Characklis 1981). This phenomenon is known as biofouling.…”

Section: Biofoulingmentioning

confidence: 93%

Exploitation of marine algae: biogenic compounds for potential antifouling applications

Bhadury

Wright

2004

Planta

281

173

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Marine algae are one of the largest producers of biomass in the marine environment. They produce a wide variety of chemically active metabolites in their surroundings, potentially as an aid to protect themselves against other settling organisms. These active metabolites, also known as biogenic compounds, produced by several species of marine macro- and micro-algae, have antibacterial, antialgal, antimacrofouling and antifungal properties, which are effective in the prevention of biofouling, and have other likely uses, e.g. in therapeutics. The isolated substances with potent antifouling activity belong to groups of fatty acids, lipopeptides, amides, alkaloids, terpenoids, lactones, pyrroles and steroids. These biogenic compounds have the potential to be produced commercially using metabolic engineering techniques. Therefore, isolation of biogenic compounds and determination of their structure could provide leads for future development of, for example, environmentally friendly antifouling paints. This paper mainly discusses the successes of such research, and the future applications in the context of understanding the systems biology of micro-algae and cyanobacteria.

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“…In-sewer heat exchangers are subject to fouling caused by bacterial biofilms and incorporated inorganic matter [11,[22][23][24], which can lead to a substantial reduction of the heat transfer efficiency up to 50% [25]. That requires the heat exchangers to be either efficiently cleaned or oversized.…”

Section: Foulingmentioning

confidence: 99%

Suitability of combined sewers for the installation of heat exchangers

Stránský

Kabelkova

Bareš

et al. 2016

Ecological Chemistry and Engineering S

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Abstract:The present paper deals with the classification of the suitability of combined sewers for the installation of heat exchangers and with assessment of the theoretical potential of wastewater in the sewer system for heating of buildings. A classification scheme involving criteria like theoretically available heat, sewer diameter, number of the heat exchanger parallel modules in the sewer cross-section, hydraulic conditions (hydraulic capacity of the sewer, pressurized flow), and potential fouling by biofilm growth was developed. First, individual sewers in the pilot catchment were assessed based on monitoring the flow characteristics and wastewater temperatures and on pipe flow modelling. Second, connectivity of the suitable and partly suitable sewers was examined with respect to the length necessary for the installation of the heat exchanger with the minimum required power of 100 kW. For the continuous sewer sections, the maximum potential power was calculated. The presented approach is generally applicable, however, for other heat exchanger types and other climatic and economic conditions, values of the suitability criteria for the heat exchanger installation must be adapted.

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Bioengineering report: Fouling biofilm development: A process analysis

Cited by 346 publications

References 24 publications

Increased mass transfer to microorganisms with fluid motion

Increased mass transfer to microorganisms with fluid motion

Exploitation of marine algae: biogenic compounds for potential antifouling applications

Suitability of combined sewers for the installation of heat exchangers

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