The effect of air-induced velocity gradient and dissolved oxygen on bioflocculation in the trickling filter/solids contact process

Motta, Enrique J. La; Jiménez, José; Josse, Juan; Manrique, Alfonso

doi:10.1016/s1093-0191(02)00011-4

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…The power terms in equation (1) are decided based upon maximisation of coefficient of determination for lab-scale experimental observations. The velocity gradient due to superficial upflow velocity of wastewater (G w ) (Polasek and Mutl, 2002) and produced biogas (G g ) (Motta et al, 2003) can be obtained from the following expressions:…”

Section: Development Of Biomass Granulation Indexmentioning

confidence: 99%

“…The energetical conditions of agglomeration are usually quantified by two parameters, i.e., velocity gradient (G) and Camp number (Ca). The role of velocity gradient on flocculation and designing of flocculator based upon G and Ca is a well-established scientific fact (Ives and Bhole, 1977;Mhaisalkar et al, 1991;Rossini et al, 1999;Motta et al, 2003). Velocity gradient is defined by the equations (2) and (3).…”

Section: Development Of Biomass Granulation Indexmentioning

confidence: 99%

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Simulation of granulation index and its utility for predicting percentage granules in UASB reactors

Bhunia

Ghangrekar

2009

WRSTSD

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This paper researches on the development of a dimensionless number for predicting percentage granulation in Upflow Anaerobic Sludge Blanket (UASB) reactors for treating biodegradable wastewaters. A Biomass Granulation Index (BGI) has been framed based on the experimental work conducted using laboratory scale UASB reactors. This index depends on mixing in the sludge bed, induced due to biogas and superficial upflow velocity of wastewater in UASB reactors. For obtaining proper granulation (percentage granules greater than 50%) resulting in higher Chemical Oxygen Demand (COD) removal efficiency, this paper recommends to design UASB reactors with BGI in the range of 240-560.

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Section: Development Of Biomass Granulation Indexmentioning

confidence: 99%

Section: Development Of Biomass Granulation Indexmentioning

confidence: 99%

Simulation of granulation index and its utility for predicting percentage granules in UASB reactors

Bhunia

Ghangrekar

2009

WRSTSD

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“…The velocity gradient due to produced biogas (G) [24] can be obtained from the following expressions:…”

Section: Development Of Granulation Index (Gi)mentioning

confidence: 99%

“…The energetic conditions of agglomeration are usually quantified by two parameters, i.e., velocity gradient (G) and Camp number (Ca). The role of velocity gradient on flocculation and designing flocculator based upon G and Ca is a well-established scientific fact [24,26,27]. Although the quantity defined by Eq.…”

Section: Development Of Granulation Index (Gi)mentioning

confidence: 99%

Influence of biogas-induced mixing on granulation in UASB reactors

Bhunia

Ghangrekar

2008

Biochemical Engineering Journal

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“…However, some factors affecting activated sludge flocculation include solids retention time (SRT) (Parker et al, 1970, Chao and Keinath, 1979, and, Parker, 1983, MLSS concentration (Chapman 1983), dissolved oxygen (DO) level (Starkey and Karr, 1984;Wilen andBalmer, 1998, La Motta et al, 2003) and turbulence, measured as velocity gradient (G) (Parker et al, 1970, Parker, 1983, Das et al, 1993, La Motta et al, 2003, Jimenez et al, 2004. Jimenez et al (2004) showed the effect of G on the kinetics of bioflocculation and compared the bioflocculation removal rates for different particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Impact of Operational Parameters on the Removal of Particulate Cod in the Activated Sludge Process

Jiménez¹,

Motta²,

Parker³

2004

proc water environ fed

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The removal of particulate material in the aeration basin of the activated sludge process is mainly attributed to bioflocculation and hydrolysis of particulate substrate. The bioflocculation process in the aeration tank of the activated sludge process occurs only under favorable conditions in the system and several common operational parameters affect its performance. The principal objective of this research was to observe the effect of MLSS, SRT and EPS on the removal of particulate substrate by bioflocculation. A first order particulate removal expression, based on flocculation, accurately described the removal rates for supernatant suspended solids and colloidal COD. Based on the results presented in this investigation, a mixed liquor concentration of approximately 2,200 mg/L, an SRT of at least 3 days and a contact time of 30 minutes are needed for relatively complete removal of the particulate substrate in a plug flow reactor.

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The effect of air-induced velocity gradient and dissolved oxygen on bioflocculation in the trickling filter/solids contact process

Cited by 13 publications

References 8 publications

Simulation of granulation index and its utility for predicting percentage granules in UASB reactors

Simulation of granulation index and its utility for predicting percentage granules in UASB reactors

Influence of biogas-induced mixing on granulation in UASB reactors

Impact of Operational Parameters on the Removal of Particulate Cod in the Activated Sludge Process

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