Mass transfer in a membrane aerated biofilm

Picard, Charlotte; Logette, S.; Schrotter, Jean‐Christophe; Aimar, Pierre; Rémigy, Jean-Christophe

doi:10.1016/j.watres.2012.05.056

Cited by 20 publications

(5 citation statements)

References 77 publications

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“…It was better when the COD was high (Figure 5c). This could be probably explained by a better matter transfer by diffusion in the boundary layer, which was created (in the absence of agitation) between the liquid phase and the biofilm (Picard, 2011;Lé, 2008). Figure 6a shows that turbidity was eliminated for all tests.…”

Section: Adaptation Testsmentioning

confidence: 99%

“…In the presence of the biofilm, colloidal matter can be eliminated by adsorption. Dissolved matter can be removed by a complex mechanism involving convection, diffusion, adsorption, hydrolysis and finally, the degradation reaction itself (Picard, 2011). Some pollutants like heavy metals, dyes and refractory organic matter could be removed by biosorption through absorption, adsorption, and ion exchange (Gadd, 2008).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of oxygen transfer processes improvement for domestic wastewaters treatment

Ngala¹,

Ahmed²,

Jerroumi³

et al. 2019

Afr. J. Biotechnol.

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In aerated processes, the oxygen transfer was limited by the presence of the suspended matter as colloid and the dissolved matter, which might decrease the biological degradation effectiveness. In this publication, three series of tests were conducted to study possibilities to reduce these matters: bacterial adaptation which was conducted in a biological aerated filter, adsorption/biosorption conducted on a biological aerated filter with a biofilm of adapted bacteria and percolation in a bioreactor with a packed plastic media. All the tests carried out gave convincing results concerning turbidity and chemical oxygen demand, as parameters limiting the oxygen transfer for a better biodegradation. The advanced adaptation improved their elimination. So, all these treatment techniques could be used as pretreatment processes; in addition, they required very little energy, particularly adsorption/biosorption and percolation.

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Section: Adaptation Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of oxygen transfer processes improvement for domestic wastewaters treatment

Ngala¹,

Ahmed²,

Jerroumi³

et al. 2019

Afr. J. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…Meanwhile, for both reactors, the biofilms began to partially fall off after 42 d. However, the removal rate of NH4 + under the higher aeration intensity tended to be higher than under the weak aeration intensity, which was consistent with the experimental conclusions of Nie (2015). Within a certain aeration intensity range, the DO concentration increases with the increasing aeration, and thus improves the activity and metabolism of the nitrite oxidizing bacteria that are aerobic and contribute to the greater removal performance of NH4 + in the treatment of papermaking wastewater (Picard et al 2012). In contrast, if the aeration intensity is small, the low DO concentration will reduce the activity of the nitrite oxidizing bacteria, as well as the removal efficiency of NH4 + .…”

Section: Effect Of the Aeration Intensity On The Removal Performance mentioning

confidence: 99%

“…Therefore, the mass transfer is one of the most vital factors in biofilm treatment. One way to enhance oxygen transfer in a biofilm is to directly feed the biofilm gaseous oxygen through aeration (Pan et al 2016;Mendoza-Lera et al 2017), which also accelerates soluble substrates being transferred by diffusion from the liquid (generally aqueous) phase circulated along the inside of the biofilm (Picard et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Study on the Mass Transfer Enhancement in Biofilms Applied in Papermaking Wastewater Treatment

et al. 2017

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The research and refinement of papermaking wastewater treatment and reuse technology are important measures for energy conservation and emission reduction in the papermaking industry. This paper studied the process of biofilm formation and dissolved oxygen mass transfer of biofilms cultivated under different aeration intensities and attempted to enhance the biofilm reactor performance. The removal efficiencies of the chemical oxygen demand, total nitrogen, and ammonia nitrogen through biofilm treatment in two parallel biofilm reactors were higher under the larger aeration intensity (8 L/min) than under the smaller intensity (4 L/min). Macroscopically, this reflected the effect of dissolved oxygen on nitrogen removal. Microscopically, in terms of the dissolved oxygen profiles inside of the biofilms determined using a microelectrode probe, both aerobic and anaerobic layers occurred inside the biofilms, which suggested that simultaneous nitrification and denitrification occurred. The different aeration intensities led to differences in the internal and external dissolved oxygen concentrations in the biofilms, which affected the biofilm growth. This led to different micro-structures, and so the internal metabolism and wastewater treatment performance of the biofilms were not identical.

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“…Within biofilms, particularly when their permeability is low as in most purely bacterial biofilms, diffusion governs solute transport 10 , 20 , 21 . However, in more permeable biofilms, advection can sustain mass transport, provided that the pressure gradient is sufficiently large 22 , 23 . The enhancement of solute transport in permeable biofilms likely modulates the metabolic activity, however, this has not been investigated for complex phototrophic biofilms.…”

Section: Introductionmentioning

confidence: 99%

Biophysical properties at patch scale shape the metabolism of biofilm landscapes

Depetris

Tagliavini

Peter

et al. 2022

npj Biofilms Microbiomes

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Phototrophic biofilms form complex spatial patterns in streams and rivers, yet, how community patchiness, structure and function are coupled and contribute to larger-scale metabolism remains unkown. Here, we combined optical coherence tomography with automated O2 microprofiling and amplicon sequencing in a flume experiment to show how distinct community patches interact with the hydraulic environment and how this affects the internal distribution of oxygen. We used numerical simulations to derive rates of community photosynthetic activity and respiration at the patch scale and use the obtained parameter to upscale from individual patches to the larger biofilm landscape. Our biofilm landscape approach revealed evidence of parallels in the structure-function coupling between phototrophic biofilms and their streambed habitat.

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Mass transfer in a membrane aerated biofilm

Cited by 20 publications

References 77 publications

Study of oxygen transfer processes improvement for domestic wastewaters treatment

Study of oxygen transfer processes improvement for domestic wastewaters treatment

Study on the Mass Transfer Enhancement in Biofilms Applied in Papermaking Wastewater Treatment

Biophysical properties at patch scale shape the metabolism of biofilm landscapes

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