Development and Scale-Up of an Aerobic Biofilm Air-Lift Suspension Reactor

Heijnen, Joseph J.; Loosdrecht, Mark C.M. van; Mulder, R.; Weltevrede, R.; Mulder, A.

doi:10.2166/wst.1993.0505

Cited by 49 publications

(15 citation statements)

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“…The importance of biofilms is underlined by their role in many chronic diseases, antibiotic resistance, biofouling, and wastewater treatment (3,4). However, it is only recently that the consequences of the proximity of individuals in these communities has been approached from a social-evolution perspective (5)(6)(7)(8)(9)(10)(11).…”

mentioning

confidence: 99%

Cooperation and conflict in microbial biofilms

Xavier

Foster

2007

Proc. Natl. Acad. Sci. U.S.A.

478

457

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Biofilms, in which cells attach to surfaces and secrete slime (polymeric substances), are central to microbial life. Biofilms are often thought to require high levels of cooperation because extracellular polymeric substances are a shared resource produced by one cell that can be used by others. Here we examine this hypothesis by using a detailed individual-based simulation of a biofilm to investigate the outcome of evolutionary competitions between strains that differ in their level of polymer production. Our model includes a biochemical description of the carbon fluxes for growth and polymer production, and it explicitly calculates diffusion-reaction effects and the resulting solute gradients in the biofilm. An emergent property of these simple but realistic mechanistic assumptions is a strong evolutionary advantage to extracellular polymer production. Polymer secretion is altruistic to cells above a focal cell: it pushes later generations in their lineage up and out into better oxygen conditions, but it harms others; polymer production suffocates neighboring nonpolymer producers. This property, analogous to vertical growth in plants, suggests that polymer secretion provides a strong competitive advantage to cell lineages within mixed-genotype biofilms: global cooperation is not required. Our model fundamentally changes how biofilms are expected to respond to changing social conditions; the presence of multiple strains in a biofilm should promote rather than inhibit polymer secretion.sociobiology ͉ bacteria ͉ individual-based modeling

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mentioning

confidence: 99%

Cooperation and conflict in microbial biofilms

Xavier

Foster

2007

Proc. Natl. Acad. Sci. U.S.A.

478

457

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“…In the initial stages of biofilm formation, motile bacteria swim around and adhere to a variety of surfaces, such as host cells and tissues [19–21], biomedical devices [22–24], and industrial equipments [25–27]. Understanding the swimming strategy of the microorganisms has been shown to be essential for identifying the adhesion rate and elucidating the subsequent colonization process.…”

Section: Near-surface Motion Of Bacteriamentioning

confidence: 99%

Interplay of physical mechanisms and biofilm processes: review of microfluidic methods

et al. 2015

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Bacteria in natural and artificial environments often reside in self-organized, integrated communities known as biofilms. Biofilms are highly structured entities consisting of bacterial cells embedded in a matrix of self-produced extracellular polymeric substances (EPS). The EPS matrix acts like a biological ‘glue’ enabling microbes to adhere to and colonize a wide range of surfaces. Once integrated into biofilms, bacterial cells can withstand various forms of stress such as antibiotics, hydrodynamic shear and other environmental challenges. Because of this, biofilms of pathogenic bacteria can be a significant health hazard often leading to recurrent infections. Biofilms can also lead to clogging and material degradation; on the other hand they are an integral part of various environmental processes such as carbon sequestration and nitrogen cycles. There are several determinants of biofilm morphology and dynamics, including the genotypic and phenotypic states of constituent cells and various environmental conditions. Here, we present an overview of the role of relevant physical processes in biofilm formation, including propulsion mechanisms, hydrodynamic effects, and transport of quorum sensing signals. We also provide a survey of microfluidic techniques utilized to unravel the associated physical mechanisms. Further, we discuss the future research areas for exploring new ways to extend the scope of the microfluidic approach in biofilm studies.

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“…The moving bed bioreactor is one of the latest developments in a class of reactors situated in the spectra of wastewater treatment between activated sludge and fixed-film biofilters [7], [8]. Biofilm is attached to the carrier elements that move freely along with the water in the reactor.…”

Section: Introductionmentioning

confidence: 99%

Use of Electro-Chemical Process for Waste Sludge Generated from Moving Bed Bioreactor

Azizi¹,

Sithebe²

2015

IJESD

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Abstract-The rapid population growth in South Africa has increased the requirement of waste water treatment facilities. This study was conducted to assess the moving bed bio reactor receiving from Mafikeng sewage treatment plant. The experiment was undertaken on a continue laboratory scale and analytical data was collected before and after treatment. The reduction of 83.21 COD, 87.64BOD was achieved in optimum Hydraulic retention time. The efforts also made an attention into potential technology for waste sludge reduction. The study was undertaken the use of electrochemical process as pre-treatment for waste sludge. It is observed 60% of digestion period was decreased through the Electro-chemical treatment.Basic data obtained through the experimental research are demonstrated that the MBBR may be used in an extremely compact high-rate process (<3h total HRT) for secondary treatment process and the combination of electrochemical and aerobic digestion system is proposed to overcome all the disadvantages of aerobic and anaerobic digestion system. The complete system offers a most advance and improved sewage treatment plant.

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Development and Scale-Up of an Aerobic Biofilm Air-Lift Suspension Reactor

Cited by 49 publications

References 0 publications

Cooperation and conflict in microbial biofilms

Cooperation and conflict in microbial biofilms

Interplay of physical mechanisms and biofilm processes: review of microfluidic methods

Use of Electro-Chemical Process for Waste Sludge Generated from Moving Bed Bioreactor

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