Attached-growth process engineering in wastewater treatment

Macoveanu, Matei

doi:10.1007/s004490050030

Cited by 40 publications

(32 citation statements)

References 16 publications

(24 reference statements)

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“…Both treatment bioreactors use biofilms to remove pollutants [1,2], it is therefore critical in bio-reactor design to understand the phenomena and mechanisms governing biofilm growth dynamics.…”

Section: Introductionmentioning

confidence: 99%

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

et al. 2014

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A novel microelectrode array sensor was fabricated using MEMS technology on a needle, and then applied to real-time measurement of dissolved oxygen (DO) inside biofilms. The sensor consists of eleven gold disk microelectrodes and a rectangular auxiliary electrode along them and an external & internal reference electrode. Three kinds of sensors were designed and their responses were characterized and evaluated under various environmental conditions. The arrays exhibit a linear response to DO in the 0 -8 mg L -1 concentration range in water, high sensitivity, repeatability, and low limits of detection (< 0.11 mg L -1 ) and quantification (0.38 mg L -1 ). The sensors were then validated against a commercial Clark-type microelectrode and applied to profiling of DO in a heterotrophic biofilm cultivated in a flat-plate bioreactor. It is shown that the sensor array can provide a multipoint, simultaneous snapshot profile of DO inside a biofilm with high spatial resolution due to its micrometric dimensions. We conclude that this new sensor array represents a powerful tool for sensing of DO biofilms and in numerous bioprocesses.

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Section: Introductionmentioning

confidence: 99%

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

et al. 2014

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“…It is well known that lower medium inflow rates favor the formation of thicker biofilms with lower areal biofilm density. The increase of inflow rate produces thinner biofilm with higher areal density (Gavril and Macoveanu, 2000;Donlan and Costerton, 2002;Liu and Tay, 2002). Table 5: Biofilm thickness changes (L f ) along the HRTB at different combinations of bioreactor process parameters (n and F) during the heavy metal removal process.…”

Section: +mentioning

confidence: 99%

“…For biosorption of heavy metals microbial biofilms show great potential in wastewater treatment systems. Therefore, different bioreactor types (e.g., trickling filters, fluidized or packed bed bioreactors, thin layers or biodisc reactors) were developed for different wastewater treatment systems (Gavril and Macoveanu, 2000;Nicolella et al, 2000;Chojnacka, 2010;Chu, 2010).…”

Section: Introductionmentioning

confidence: 99%

Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model

Rezić

Zeiner

et al. 2014

Braz. J. Chem. Eng.

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-In this research, a multi heavy metals removal process with mixed microbial culture was examined in a horizontal rotating tubular bioreactor (HRTB) with different combinations of process parameters. Three metals were selected as examples of cations (manganese and cobalt) and oxy-anion (hexavalent chromium). Hydrodynamic conditions and biomass sorption capacity in the HRTB had the main impact on the heavy metals removal efficiencies, which were for Mn 2+ 87.0-93.6%, Co 2+ 89.0-95.7% and Cr 6+ 99.7-100%, respectively. For the bioprocess description in the HRTB, the integral bioprocess model that combines hydrodynamics, mass transfer and kinetics was used. This model was evaluated for the new experimental conditions and average variances between experimental and simulated data were in the range of 0.12 -3.21·10 -3 . The results obtained clearly show that the integral bioprocess model is able to describe the heavy metal removal process in the HRTB.

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“…Biofilm application in the biosorption showed great potential in the wastewater treatment systems. Different types of bioreactor systems such as trickling filters, fluidized or packed bed bioreactors, and thin layer or biodisc reactors were implemented for biofilm formation and wastewater treatment [12][13][14]. Horizontal rotating tubular bioreactor (HRTB) was designed as combination of a thin layer [15,16] and biodisc reactor [17] with construction abilities for successful biofilm formation.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, outer biofilm layers can be released even at relatively small shear stress. After this, the detachment rate is considerably reduced [12,47]. Thinner biofilms are less sensitive to process condition changes, which has positive influence on the process stability [44].…”

mentioning

confidence: 99%

Application of Mixed Microbial Culture Biofilms for Manganese (II), Cobalt (II), and Chromium (VI) Biosorption by Horizontal Rotating Tubular Bioreactor

Rezić¹,

Rezić²,

Zeiner³

et al. 2017

Biological Wastewater Treatment and Resource Recovery

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Industrial wastewater contaminated with toxic heavy metals is a big ecological and environmental problem. Applying biological materials to effectively remove and recover heavy metals from contaminated wastewaters has gained importance as promising alternative to conventional treatment techniques. Thus, the objective of the presented paper is the investigation of the capability of microorganisms, isolated from polluted (metal-laden) soil, to biosorb toxic metals from aqueous solutions. Biosorption process for heavy metal removal was conducted in a new pilot scale horizontal rotating tubular bioreactor (HRTB). This bioreactor provides conditions for microorganism'sg r o w t hi naf o r mo fs u s p e n d e d cells and biofilm. Biofilm is capable to protect microorganisms from interaction with toxic metals in the surrounding environment. Three metals were selected as model examples: cations of manganese and cobalt and hexavalent chromium (an oxyanion). Optimized bioreactor conditions, namely, medium inflow rate (F) and bioreactor rotation speed (n) for biofilm formation and metal removal were monitored, and under optimized bioreactor conditions, promising results were obtained.

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Attached-growth process engineering in wastewater treatment

Cited by 40 publications

References 16 publications

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

Profiling of oxygen in biofilms using individually addressable disk microelectrodes on a microfabricated needle

Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model

Application of Mixed Microbial Culture Biofilms for Manganese (II), Cobalt (II), and Chromium (VI) Biosorption by Horizontal Rotating Tubular Bioreactor

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