Mathematical models of biological waste treatment processes for the design of aeration tanks

Вавилин, В.А.; Vasilyev, V.B.

doi:10.1016/0043-1354(78)90156-2

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…There were 16 papers cited by Chemical Abstract in the past 30 years on the optimization method of wastewater treatment. All of them involve complex mathematical theory and need a large amount of funds [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The average treatment plants cannot meet such requirement.…”

Section: Introductionmentioning

confidence: 99%

Optimal parameters forPhanerochaete chrysosporiumdegradation of terephthalic acid wastewater

Cheng

Pei

et al. 2000

Toxicological & Environmental Chemistry

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The optimal parameters for the degradation of pure terephthalic acid (PTA) wastewater by the white rot fungus Phanerochaete chrysosporium were investigated. The relative mathematical model, objective function equation, constraint equations, constraint conditions and computer program were established in the optimal method. The results showed that the optimal value of the reactor volume needed was 9798 m 3 . It could save 83.82% of the reactor volume, which was needed for the native bacterium YZ1. This optimal method is simple, useful and economical for average treatment plants. Using the optimal parameters and P. chrysosporium to design and operate the treatment process of PTA wastewater would increase the treatment efficiency and decrease the cost.

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Section: Introductionmentioning

confidence: 99%

Optimal parameters forPhanerochaete chrysosporiumdegradation of terephthalic acid wastewater

Cheng

Pei

et al. 2000

Toxicological & Environmental Chemistry

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“…Different stages of degradation of solid waste depend on the position of waste inside a plug-flow reactor, exhibiting continuously progressing degradation. Assuming simple first-order kinetics for an anaerobic digestion process limited by polymer hydrolysis, it is quite obvious that a plug-flow reactor will remove waste more effectively than a CSTR (Metcalf & Eddy, Inc., 2003;Vavilin and Vasiliev, 1978). Although mixing is imperfect, which leaves many dead unmixed zones, anaerobic digestion models often assume complete mixing conditions (see Batstone et al, 2002).…”

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confidence: 99%

Anaerobic digestion of solid material: Multidimensional modeling of continuous‐flow reactor with non‐uniform influent concentration distributions

Вавилин

Lokshina

Flotats

et al. 2006

Biotech & Bioengineering

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A new multidimensional (3 and 2D) anaerobic digestion model for cylindrical reactor with non-uniform influent concentration distributions was developed to study the way in which mixing intensity affects the efficiency of continuous-flow anaerobic digestion. Batch experiments reported and simulated earlier by Vavilin and Angelidaki (2005) were used to modernize a kinetic scheme and to obtain the corresponding kinetic coefficients. In the new models, hydrolytic microorganisms were included using Contois kinetics for the hydrolysis/acidogenesis degradation of municipal solid waste (MSW). Monod kinetics was applied for description of methanogenesis. Both hydrolytic and methanogenic microorganisms were assumed to be inhibited by high volatile fatty acids (VFA) concentration. According to the new distributed models, the mixing level reduction expressed by increasing dimensionless Peclet number may improve the continuous flow reactor performance at the relatively low influent methanogenic biomass concentration. In the continuously stirred tank reactor (CSTR) there are two steady states with and without methane production at slightly different values of initial methanogenic biomass concentration. In the system, the threshold methanogenic biomass concentration existed because of inhibition by high VFA concentration. High methanogenic biomass concentration is required for efficient anaerobic digestion of MSW in order to avoid possible inhibition due to high VFA build-up. Thus, CSTR configuration might have unstable dynamics at high organic loading as shown in earlier experiments carried out by Stroot et al. (2001). A gradual increase of organic loading during the start up of a completely mixed digester causing an accumulation of methanogenic biomass is a solution to prevent a probable digester failure. According to the distributed models a plug-flow reactor with non-uniform influent concentration distributions where methanogenic and hydrolytic microorganisms are separated has significant methane production and solids removal at the relatively low influent methanogenic biomass concentration.

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Activated sludge process performance using a multistage tower aeration tank

Shimizu

Kudo

Nasu

1993

Biotech & Bioengineering

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This study's objective was to clarify both experimentally and theoretically whether a vertical multistage tower aeration tank system is advantageous as compared with a completely mixed system, particularly with respect to purification efficiency, sludge settleability, and excess sludge production. In comparing the two systems: (1) purification efficiency in the multistage tower aeration system with partial fluid mixing with a large Peclet number was higher than in a corresponding completely mixed system for all applied organic loadings; (2) the multistage tower aeration system had some definite advantages with respect to sludge settleability and excess sludge production; (3) the activated sludge system's higher performance with partial fluid mixing was shown quantitatively with the axial dispersion model in conjunction with growth kinetics which involved rapid uptake such as biosorption and subsequent oxidative biodegradation processes of organic substances.

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Mathematical models of biological waste treatment processes for the design of aeration tanks

Cited by 9 publications

References 12 publications

Optimal parameters forPhanerochaete chrysosporiumdegradation of terephthalic acid wastewater

Optimal parameters forPhanerochaete chrysosporiumdegradation of terephthalic acid wastewater

Anaerobic digestion of solid material: Multidimensional modeling of continuous‐flow reactor with non‐uniform influent concentration distributions

Activated sludge process performance using a multistage tower aeration tank

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