Transport of hydrophobic pollutants through biofilms in biofilters

Miller, Martha J.; Allen, D. Grant

doi:10.1016/j.ces.2004.05.011

Cited by 35 publications

(27 citation statements)

References 25 publications

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“…Biofiltration involves passing waste air through a packed reactor containing active microorganisms capable of degrading pollutants (Shareefdeen and Singh, 2005). In general, biofilters achieve the highest rates of removal when compounds that are treated are water soluble and biodegradable (Deshusses and Johnson, 2000;Miller and Allen, 2004).…”

Section: Introductionmentioning

confidence: 99%

Elimination of hydrophobic volatile organic compounds in fungal biofilters: Reducing start‐up time using different carbon sources

Vergara-Fernández

Hernández

Revah

2010

Biotech & Bioengineering

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Fungal biofilters have been recently studied as an alternative to the bacterial systems for the elimination of hydrophobic volatile organic compounds (VOC). Fungi foster reduced transport limitation of hydrophobic VOCs due to their hydrophobic surface and extended gas exchange area associated to the hyphal growth. Nevertheless, one of their principal drawbacks is their slow growth, which is critical in the start-up of fungal biofilters. This work compares the use of different carbon sources (glycerol, 1-hexanol, wheat bran, and n-hexane) to reduce the start-up period and sustain high n-hexane elimination capacities (EC) in biofilters inoculated with Fusarium solani. Four parallel experiments were performed with the different media and the EC, the n-hexane partition coefficient, the biomass production and the specific consumption rate were evaluated. Biofilters were operated with a residence time of 1.3 min and an inlet n-hexane load of 325 g m(-3) (reactor) h(-1). The time to attain maximum EC once gaseous n-hexane was fed was reduced in the three experiments with alternate substrates, as compared to the 36 days needed with the control where only n-hexane was added. The shortest adaptation period was 7 days when wheat bran was initially used obtaining a maximum EC of 160 g m(-3) (reactor) h(-1) and a critical load of 55 g m(-3) (reactor) h(-1). The results were also consistent with the pressure drop, the amount of biomass produced and its affinity for the gaseous n-hexane, as represented by its partition coefficient.

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Section: Introductionmentioning

confidence: 99%

Elimination of hydrophobic volatile organic compounds in fungal biofilters: Reducing start‐up time using different carbon sources

Vergara-Fernández

Hernández

Revah

2010

Biotech & Bioengineering

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“…Waterinsoluble compounds such as α-pinene have been found to be significantly removed by biofilm (VanGroenestijn and Liu, 2002). Upon comparison, the α-pinene partitioning of biofilm containing biomass and organics was also found to be greater than biofilm in water (Miller and Allen, 2004).…”

Section: Biomassmentioning

confidence: 90%

“…Biofiltration is generally based on two principals: firstly, the transfer of pollutants from the air feed to the support medium. Secondly, the contaminants are bio-catalysed to biomass, carbon dioxide, water and other by-products (Miller and Allen, 2004). Schematic diagram of a biofilteration unit is shown in Fig.…”

Section: Bio-treatmentmentioning

confidence: 99%

Volatile Organic Compounds Removal Methods: A Review

Bouchaala¹

2012

American Journal of Biochemistry and Biotechnology

143

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Volatile Organic Compounds (VOCs) are among the most toxic chemicals which are detrimental to humans and environment. There is a significant need of fully satisfactory method for removal of VOCs. There are several methods including physical, chemical and biological treatments available to remove VOCs by either recovery or destruction. The aim of the present study is to summarize the available methods for VOC removal; trying to find a promising method among the available techniques. A wide range of VOCs can be treated biologically in which it offers advantages over more traditional processes including lower operating and capital costs and a smaller carbon footprint. However, due to a complex nature and diversity of VOCs it is hard to find a simple and promising method. Treatment still requires more research to solve the associate problems with available VOC elimination techniques.

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“…The dependence of gas solubility in the bio-medium is determined by Henry's Law (Miller, Allen 2005) which provides that, "at a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid". Thus, an increase in temperature decreases gas solubility in the medium while a decrease increases it (Miller, Allen 2004). Figure 7 displays ammonia concentration in the air supplied to and removed from the device and the dependence of air treatment efficiency on time considering the air flow rate in the packing material (0.079 m/s).…”

Section: Resultsmentioning

confidence: 99%

Effectiveness Research on a Wavy Lamellar Plate-Type Biofilter With a Capillary System for the Humidification of the Packing Material Applying Introinduced Microorganisms

Mačaitis

Misevičius

Paškevičius

et al. 2014

Journal of Environmental Engineering and Landscape Management

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Abstract. Trinitrotoluene (TNT), a commonly used explosive for military and industrial applications, can cause serious environmental pollution. 28-day laboratory pot experiment was carried out applying bioaugmentation using laboratory selected bacterial strains as inoculum, biostimulation with molasses and cabbage leaf extract, and phytoremediation using rye and blue fenugreek to study the effect of these treatments on TNT removal and changes in soil microbial community responsible for contaminant degradation. Chemical analyses revealed significant decreases in TNT concentrations, including reduction of some of the TNT to its amino derivates during the 28-day tests. The combination of bioaugmentation-biostimulation approach coupled with rye cultivation had the most profound effect on TNT degradation. Although plants enhanced the total microbial community abundance, blue fenugreek cultivation did not significantly affect the TNT degradation rate. The results from molecular analyses suggested the survival and elevation of the introduced bacterial strains throughout the experiment. Keywords: TNT, bioaugmentation, biostimulation, phytoremediation, microbial community.

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Transport of hydrophobic pollutants through biofilms in biofilters

Cited by 35 publications

References 25 publications

Elimination of hydrophobic volatile organic compounds in fungal biofilters: Reducing start‐up time using different carbon sources

Elimination of hydrophobic volatile organic compounds in fungal biofilters: Reducing start‐up time using different carbon sources

Volatile Organic Compounds Removal Methods: A Review

Effectiveness Research on a Wavy Lamellar Plate-Type Biofilter With a Capillary System for the Humidification of the Packing Material Applying Introinduced Microorganisms

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