Molecular Mechanism of Granulation. I: H
            <sup>+</sup>
            <b>Translocation-Dehydration Theory</b>

Tay, Joo‐Hwa; Xu, Hai-Lou; Teo, Khay-Chuan

doi:10.1061/(asce)0733-9372(2000)126:5(403)

Cited by 67 publications

(39 citation statements)

References 60 publications

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“…Cell surface hydrophobicity had been generally considered to be an important affinity force in the self-immobilization and attachment of cells, e.g., biofilm and anaerobic granules [23][24][25][26]. Hydrophobic binding is very important for cell-to-cell interaction, which may induce the initial self-immobilization of bacteria and further keep the bacteria tightly together.…”

Section: Discussionmentioning

confidence: 99%

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Liu

Tay

Liu

2003

Environmental Technology

100

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The development of aerobic granules was studied in four column-type sequential aerobic sludge blanket reactors fed with different substrate concentrations ranging from 500 to 3000 mg l(-1) COD. Results showed that aerobic granules successfully formed in all reactors fed with different substrate concentrations, indicating that the formation of aerobic granules is independent of the substrate concentration. The granule size, roundness, compactness, physical strength, as well as cell surface hydrophobicity and cell polysaccharides contents of the cultivated aerobic granules were investigated. It was shown that aerobic granules formed with different substrate concentrations had similar roundness and compactness. However, the size of aerobic granules slightly increased with an increase in substrate concentration, while granule strength decreased with substrate concentration. It was found that there was a significant increase in cell surface hydrophobicity and cell polysaccharides of the aerobic granules compared to that of seed sludge. The high cell surface hydrophobicity and high cell polysaccharides contents were believed to play an important role in the formation of aerobic granules. However, substrate concentration seems not to be a governing factor for the formation of aerobic granules. The results of this study would be useful for developing aerobic granules-based bioreactor and for better understanding of the mechanism of aerobic granulation. It was also clearly demonstrated that aerobic granules-based bioreactor would have great potential in the treatment of high-strength wastewater.

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Section: Discussionmentioning

confidence: 99%

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Liu

Tay

Liu

2003

Environmental Technology

100

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“…Previous studies indicated that there is a strong correlation between microbial auto-aggregation and cell surface hydrophobicity (Baldi et al, 1999;Del Re et al, 2000;Kos et al, 2003;Liu et al, 2003bLiu et al, , 2004aTay et al, 2000). Improved hydrophobicity of bacteria is conductive to creating a favorable environment for the contact of bacterium-to-bacterium or impelling bacteria out of aqueous phase environments to aggregate.…”

Section: Triggering Forces For Microbial Granulationmentioning

confidence: 95%

Rapid formation of hydrogen‐producing granules in an anaerobic continuous stirred tank reactor induced by acid incubation

Zhang

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Tay

et al. 2006

Biotech & Bioengineering

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A novel approach to rapidly initiate granulation of hydrogen-producing sludge was developed in an anaerobic continuous stirred tank reactor at 37 degrees C. To induce microbial granulation, the acclimated culture was subject to an acid incubation for 24 h by shifting the culture pH from 5.5 to 2.0. The culture was resumed to pH 5.5 after the incubation and the reactor was operated at hydraulic retention times (HRTs) of 12, 6, 2, 1, and 0.5 h in sequence. Microbial aggregation took place immediately with the initiation of acid incubation and granules were developed at 114 h. No granule was observed in the absence of acid incubation in the control test. Changing the culture pH resulted in improvement in surface physicochemical properties of the culture favoring microbial granulation. The zeta potential increased from -11.6 to -3.5 mV, hydrophobicity in terms of contact angle improved from 31 degrees to 43 degrees and extracellular proteins/polysaccharides ratio increased from 0.2 to 0.5-0.8. Formation of granular sludge facilitated biomass retention of up to 32.2 g-VSS/L and enhanced hydrogen production. The hydrogen production rate and hydrogen yield increased with the reduction in HRT at an influent glucose concentration of 10 g/L once steady granular sludge layer was formed, achieving the respective peaks of 3.20 L/L x h and 1.81 mol-H(2)/mol-glucose at 0.5 h HRT. The experimental results suggested that acid incubation was able to initiate the rapid formation of hydrogen-producing granules by regulating the surface characteristics of microbial aggregates in a well-mixed reactor, which enhanced the hydrogen production.

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“…Granulation in UASB reactors depends upon several parameters such as wastewater types [9][10][11]; seed sludge characteristics [12]; characteristics of cell surface [13]; temperature [14][15]; pH [16]; and organic loading rates [4]. However, under favorable wastewater types and environmental conditions, the success of granulation in the reactors for treating biodegradable organic wastewaters (free from toxicity) depends on the operating conditions, defining magnitude of mixing in the reactors.…”

Section: Introductionmentioning

confidence: 98%

Influence of biogas-induced mixing on granulation in UASB reactors

Bhunia

Ghangrekar

2008

Biochemical Engineering Journal

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Molecular Mechanism of Granulation. I: H ⁺ Translocation-Dehydration Theory

Cited by 67 publications

References 60 publications

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Rapid formation of hydrogen‐producing granules in an anaerobic continuous stirred tank reactor induced by acid incubation

Influence of biogas-induced mixing on granulation in UASB reactors

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Molecular Mechanism of Granulation. I: H + Translocation-Dehydration Theory

Cited by 67 publications

References 60 publications

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Substrate concentration‐independent aerobic granulation in sequential aerobic sludge blanket reactor

Rapid formation of hydrogen‐producing granules in an anaerobic continuous stirred tank reactor induced by acid incubation

Influence of biogas-induced mixing on granulation in UASB reactors

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Molecular Mechanism of Granulation. I: H ⁺ Translocation-Dehydration Theory