Novel insight of spatial mass transfer conditions of upflow anaerobic reactor

Afridi, Zohaib Ur Rehman; Wu, Jing; Li, Zhong Hua; Akand, Raseduzzman; Zhi, Cao; Poncin, Souhila; Li, Huai Z.

doi:10.1016/j.jclepro.2018.09.022

Cited by 19 publications

(5 citation statements)

References 36 publications

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“…Anaerobic degradation of phenol requires the cooperation of functional microorganisms, so the compactness of microbes may further accelerate substrate transfer. Sludge particle size and compactness play an important role in anaerobic reactors, and it has been shown that larger sized sludge flocs have a higher mass transfer rate than smaller particle sludge (Afridi et al 2018). Sludge cultured with phenol was shown to have a variety of dense bacteria throughout the sludge fractions, and the VFAs formed in the sludge could easily be converted into methane by the surrounded methanogens (Chou and Huang 2005).…”

Section: Coenzyme F420 and Electron Transport System (Ets) Activity Testsmentioning

confidence: 99%

Influence of particle size distribution on anaerobic degradation of phenol and analysis of methanogenic microbial community

Wang

Sierra

et al. 2020

Environ Sci Pollut Res

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Section: Coenzyme F420 and Electron Transport System (Ets) Activity Testsmentioning

confidence: 99%

Influence of particle size distribution on anaerobic degradation of phenol and analysis of methanogenic microbial community

Wang

Sierra

et al. 2020

Environ Sci Pollut Res

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“…The COD removal efficiency of ZMS and GAC decreased rapidly, and the low pH environment caused both the surface of the carrier material and the organic wastewater to be positively charged. An electrostatic repulsion was generated, weakening the complexation between the carrier material and the organic wastewater, thus, inhibiting the carrier material absorptivity and metabolic activity of the microorganisms in the biofilms [37].…”

Section: Performance Of the Cmisr Systemmentioning

confidence: 99%

Effects of Carrier Materials on Anaerobic Hydrogen Production by Continuous Mixed Immobilized Sludge Reactors

Cao²,

2020

Period. Polytech. Chem. Eng.

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To enhance hydrogen production rate and increase substrate utilization efficiency of anaerobic fermentation, three carrier materials, Granular Activated Carbon (GAC), Zeolite Molecular Sieve (ZMS) and Biological Ceramic Ring (BCR), were used as carrier materials in Continuous Mixed Immobilized Sludge Reactors (CMISRs). The effects of carrier materials and substrate organic loading rate (OLR, OLR = 12, 24, 36, 48 kg/m3/d) on biohydrogen production were investigate, respectively. The highest HPRs of ZMS, GAC and BCR were achieved under the OLR of 36 kg COD/m3/d, and were 2.01, 1.81, and 2.86 L/L/d, respectively. The highest COD removal efficiencies of ZMS, GAC and BCR were 38.95 % (OLR = 24 kg COD/m3/d), 36.47 % (OLR = 36 kg COD/m3/d), and 41.03 % (OLR = 36 kg COD/m3/d), respectively. The best substrate degradation rate of ZMS, GAC and BCR were 40.33 % (OLR = 24 kg COD/m3/d), 38.30 % (OLR = 24 kg COD/m3/d) and 45.60 % (OLR = 12 kg COD/m3/d). The results indicated that biological ceramic ring get better hydrogen production and wastewater treatment performance as sludge carrier material for hydrogen production in immobilized bioprocesses.

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“…It is noteworthy that the magnitude of molecular diffusion is small due to the single granule and the scale of the experiment at micro level. The major mechanism for mass transfer under the static condition is molecular diffusion [21,46]. However, in large reactors the granules are in large volume, thus, the accumulative molecular diffusion is higher.…”

Section: Mass Transfer Ratementioning

confidence: 99%

“…The mass transfer condition of the granule is one of the most important factors for stable performance of the reactor [20]. The challenge is that mass transfer phenomena of anaerobic granules is not fully understood because the bio-reactor is fully covered for heat insulation; thus, a reactor is a "black box" and cannot be studied with the naked eye [21]. Several factors contribute to the variation of mass transfer.…”

Section: Introductionmentioning

confidence: 99%

“…The cumulative impact of morphology, microbiology, and operational parameters actually affects the mass transfer condition inside the reactor, which hinders or accelerates the biogas production. The challenge is that mass transfer has not been fully investigated due to complex factors involved in the process as well as limitation of technology [21]. Del Nery et al [28] reported that efficiency of a granule-based reactor is assessed by examining the physicochemical changes in the influent and the effluent.…”

Section: Introductionmentioning

confidence: 99%

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Biogas Production and Fundamental Mass Transfer Mechanism in Anaerobic Granular Sludge

Afridi

Younas

2019

Sustainability

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Anaerobic granules are responsible for organic degradation and biogas production in a reactor. The biogas production is entirely dependent on a mass transfer mechanism, but so far, the fundamental understanding remains poor due to the covered surface of the reactor. The study aimed at investigating the fundamental mass transfer characteristics of single anaerobic granules of different sizes using microscopic imaging and analytical monitoring under single and different organic loadings. The experiment was conducted in a micro reactor and mass transfer was calculated using modified Fick’s law. Scanning electron microscopy was applied to observe biogas production zones in the granule, and a lab-scale microscope equipped with a camera revealed the biogas bubble detachment process in the micro reactor for the first time. In this experiment, the granule size was 1.32, 1.47, and 1.75 mm, but 1.75 mm granules were chosen for further investigation due to their large size. The results revealed that biogas production rates for 1.75 mm granules at initial Chemical Oxygen Demand (COD) 586, 1700, and 6700 mg/L were 0.0108, 0.0236, and 0.1007 m3/kg COD, respectively; whereas the mass transfer rates were calculated as 1.83 × 10−12, 5.30 × 10−12, and 2.08 × 10−11 mg/s. It was concluded that higher organic loading and large granules enhance the mass transfer inside the reactor. Thus, large granules should be preferred in the granule-based reactor to enhance biogas production.

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Novel insight of spatial mass transfer conditions of upflow anaerobic reactor

Cited by 19 publications

References 36 publications

Influence of particle size distribution on anaerobic degradation of phenol and analysis of methanogenic microbial community

Influence of particle size distribution on anaerobic degradation of phenol and analysis of methanogenic microbial community

Effects of Carrier Materials on Anaerobic Hydrogen Production by Continuous Mixed Immobilized Sludge Reactors

Biogas Production and Fundamental Mass Transfer Mechanism in Anaerobic Granular Sludge

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