biofouling Articles

135 Results found
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Bio-fouling control on marine vessels with ozone

by Primozone Production AB  (May 10, 2012)

A recent pilot study on how to control accumulation of marine organisms on heat exchangers of marine vessels show that applying ozone is both effective and sustainable. Large economic impact Marine bio-fouling, or accumulation of marine organisms on heat-exchangers for cooling systems, is a challenge in the maritime sector and has both an economic ...

Effect of sludge retention time on membrane bio-fouling using different type and pore size of membranes in a submerged membrane bioreactor

by IWA Publishing  (Dec. 3, 2012)

The objective of this study was to investigate the influence of sludge retention time (SRT) on membrane bio-fouling. An activated sludge reactor was operated at three different SRTs (10, 30, and 50 days). Submerged membrane experiments were performed when the mixed liquor suspended solids (MLSS) concentration reached the steady state conditions. ...

Controlling Scale Deposition and Industrial Fouling

by Scalewatcher North America Inc  (Nov. 28, 2012)

It costs US industry billions of dollars a year to control and remove the limescale that builds up in industrial equipment such a heat exchangers, evaporative coolers, boilers, chillers and other water fed equipment. Oil wells, for example, face significant scaling problems from the highly mineralized water that are extracted with the ...

Integrated approach for biofouling control

by IWA Publishing  (Dec. 1, 2010)

Despite extensive research efforts, past and present strategies to control biofouling problems in spiral-wound nanofiltration and reverse osmosis membranes have not been successful under all circumstances. Gaining insight in the biofouling process is a first necessity. Based on recent insights, an overview is given of 12 potential complementary ...

Removal of inorganic anions from drinking water supplies by membrane bio/processes

by Springer  (May 1, 2005)

This paper is designed to provide an overview of the main membrane-assisted processes that can be used for the removal of toxic inorganic anions from drinking water supplies. The emphasis has been placed on integrated process solutions, including the emerging issue of membrane bioreactors. An attempt is made to compare critically recently reported ...

Irreversible fouling of membrane bioreactors due to formation of a non-biofilm gel layer

by IWA Publishing  (Apr. 24, 2014)

Extra-cellular polymeric substances (EPS), known to contribute to fouling in membrane bio-reactors (MBRs), are generally divided into bound and free EPS. The free EPS are able to form a gel layer on the membrane active surface. The mechanisms involved in formation of such layer and its effects on performance of the MBR membranes were studied. The ...

Physico-chemical characterisation versus in situ micro-structural characterisation of membrane fouling in membrane bioreactors

by IWA Publishing  (Jan. 1, 2011)

Fouling characteristics of aerobic submerged membrane bioreactors were analysed under two different membrane materials. Polyethersulfone (PES) membranes were found to foul faster at sub-critical flux than polyolefin (PO) membranes. Physico-chemical characterisation, by means of comparison of extracellular polymeric substances (EPS) and soluble ...

Industrial cooling water fouling by Dreissenidae

by Aquator B.V.  (Feb. 28, 2012)

Together with the cooling water, a wide range of living organisms is entrained into cooling water systems, which can readily colonise the available surfaces in the system. Growth conditions in the cooling water system often are ideal for sessile organisms: the steady water flow assures abundance of nutrients and oxygen, while access for predators ...

Committee Report: Recent Advances and Research Needs in Membrane Fouling

by American Water Works Association (AWWA)  (Aug. 1, 2005)

Within the drinking water industry, the use of membrane technologies such as reverse osmosis, nanofiltration, membrane bioreactors, microfiltration, and ultrafiltration continues to rapidly increase. Nevertheless, problems associated with membrane fouling still limit the efficacy of these technologies. Fouling occurs when a contaminant coats the ...

Steam injection heating of Waterwater, Sludge & BioSolids, & High Viscosity Fluids

by ProSonix  (Feb. 1, 2009)

A number of unique challenges emerge in the heating of agricultural, municipal, and food waste streams in anaerobic digestion process and biogas production. Heating devices are subject to variable size particulate, fibrous materials, wear, temperature, flows, and fluid characteristics that can make it extremely difficult to achieve and maintain ...

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