Modeling Biofiltration of Gas Streams Containing TEX Components

Nguyen, Hoa D.; Sato, Chikashi; Wu, Jing; Douglass, R.W.

doi:10.1061/(asce)0733-9372(1997)123:6(615)

Cited by 19 publications

(15 citation statements)

References 17 publications

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“…Although, studies on BTEX biodegradation in biofilter have been conducted over the last 10 years [13][14][15][16][17][18][19][20][21], results of various studies indicate that the substrate interactions between BTEX compounds often vary with microbial culture and culture conditions. In the recent years, there has been increasing trend towards more efficient utilization of agro-industrial residues, including sugar cane bagasse as packing materials.…”

Section: Introductionmentioning

confidence: 98%

Combined removal of BTEX in air stream by using mixture of sugar cane bagasse, compost and GAC as biofilter media

Mathur

Majumder

Chatterjee

2007

Journal of Hazardous Materials

114

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Section: Introductionmentioning

confidence: 98%

Combined removal of BTEX in air stream by using mixture of sugar cane bagasse, compost and GAC as biofilter media

Mathur

Majumder

Chatterjee

2007

Journal of Hazardous Materials

114

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“…A firstorder, fully implicit scheme for the time stepping was used. The equation set was normalized so that the calculated variables would be of order one to maximize numerical solvability (Nguyen et al, 1997). Because the resulting equations were tightly coupled and highly nonlinear, full Newton's method was used as an outer iteration scheme, producing an equation set for the required change of the variable set per time step, and an LU direct solution method with iterative improvement was used as an inner iteration scheme to solve the outer equations (Turner and Perré, 1997).…”

Section: Solution Methodsmentioning

confidence: 99%

Dynamic volume‐averaged model of heat and mass transport within a compost biofilter: I. Model development

Mysliwiec

VanderGheynst

Rashid

et al. 2001

Biotech & Bioengineering

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Successful, long-term operation of a biofilter system depends on maintaining a suitable biofilm environment within a porous medium reactor. In this article a mathematical study was conducted of the spatial and temporal changes of biofilter performance due to interphase heat and mass transport. The method of volume averaging was used to spatially smooth the three-phase (solid, liquid, and gas) conservation equations over the biofilter domain. The packing medium was assumed to be inert, removing the solid phase mass continuity equation from the system. The finite element method was used to integrate the resulting nonlinear-coupled partial differential equations, tracking eight state variables: temperature, water vapor, dry air, liquid water, biofilm, gas and liquid phase organic pollutant, and nutrient densities, through time and space. A multiphase, gas and liquid flow model was adapted to the biofilter model from previous studies of unsaturated groundwater flow. Newton's method accelerated by an LU direct solver was used to iterate the model for solutions. Effects of packing media on performance were investigated to illustrate the utility of the model. The moisture dynamics and nutrient cycling are presented in Part II of this article.

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“…This model allows for storage of pollutant within a sorption volume after diffusion has occurred through the whole thickness of the biofilm. Nguyen and coworkers 11 modelled the biofiltration of TEX (toluene, ethylbenzene and o-xylene) compounds. Baltzis and co-workers 15,16 developed a model that allows for adsorption onto the packing material as well as within water retained on the packing material and was used to predict transient operation of the biofilter.…”

Section: 12mentioning

confidence: 99%

Development and simulation studies of an unsteady state biofilter model for the treatment of cyclic air emissions of an α‐pinene gas stream

Dirk-Faitakis¹,

Allen²

2005

J of Chemical Tech & Biotech

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This paper describes the development and simulation of an unsteady state biofilter model used to predict dynamic behaviour of cyclically-operated biofilters and compares it with experimental results obtained from three, parallel, bench-scale biofilters treating both periodically fluctuating concentrations and constant concentrations of an α-pinene-laden gas stream. The dynamic model, using kinetic parameters estimated from the constant concentration biofilter, was able to predict the performance of cyclic biofilters operating at short cycle periods (ie, in the order of minutes and hours). Steady state kinetic data from a constant concentration biofilter can be used to predict unsteady state biofilter operation. At a 24 h cycle period, the dynamic model compared well with experimental results. For long cycle periods (ie, hours and days), removal efficiency decreased after periods of non-loading: the longer the period of non-loading, the poorer the biofilter's performance at the re-commencement of pollutant loading. At longer time scales the model did not effectively predict transient behaviour, as adsorption and changes in kinetic parameters were not accounted for. Modelling results showed that similar biofiltration performance for the cyclic and constant concentration biofiltration of α-pinene is expected for biofilters operating solely in the first order kinetics regime. Poorer performance for cyclic biofilters following Monod kinetics spanning the entire kinetics range is expected as the cycle amplitude increases. The most important parameters affecting the performance of a cyclically-operated biofilter with short cycle periods are: amplitude of cyclic fluctuations, C g,max /C g , relative value of the half-saturation constant in the Monod expression, K s , and effective diffusivity of α-pinene in the biofilm, D e .

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Modeling Biofiltration of Gas Streams Containing TEX Components

Cited by 19 publications

References 17 publications

Combined removal of BTEX in air stream by using mixture of sugar cane bagasse, compost and GAC as biofilter media

Combined removal of BTEX in air stream by using mixture of sugar cane bagasse, compost and GAC as biofilter media

Dynamic volume‐averaged model of heat and mass transport within a compost biofilter: I. Model development

Development and simulation studies of an unsteady state biofilter model for the treatment of cyclic air emissions of an α‐pinene gas stream

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