Effect of Substrate Henry’s Constant on Biofilter Performance

Zhu, Xun; Suidan, Makram T.; Pruden, Amy; Yang, Chunping; Alonso, Cristina; Kim, Byung J.; Kim, Byung R.

doi:10.1080/10473289.2004.10470918

Cited by 89 publications

(66 citation statements)

References 19 publications

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“…The increased SSAT would still be around 50 times bigger if the consideration made by Arriaga (2005) that only about 43% of the fungal biomass produced is aerial hyphae. Experimental results with bacterial biofilters degrading n-hexane, such as those reported by Zhu et al (2004) …”

Section: à3mentioning

confidence: 91%

Phenomenological model of fungal biofilters for the abatement of hydrophobic VOCs

Vergara-Fernández

Hernández

Revah

2008

Biotech & Bioengineering

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This work describes the growth of filamentous fungi in biofilters for the degradation of hydrophobic VOCs. The study system was n‐hexane and Fusarium solani B1. The system is mathematically described and the main physical, kinetic data and morphological parameters were obtained by independent experiments and validated with data from laboratory experiments. The model describes the increase in the transport area by the growth of the filamentous cylindrical mycelia and its relation with n‐hexane elimination in quasi‐stationary state in a biofilter. The model describing fungal growth includes Monod–Haldane kinetic and hyphal elongation and ramification. A specific surface area of transport (SSAT) of 1.91 × 105 m2 m−3 and a maximum elimination capacity (EC) of 248 g m−3 h−1 were obtained by the mathematical model simulation, with a 10% of error with respect to the experimental EC. Biotechnol. Bioeng. © 2008 Wiley Periodicals, Inc.

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Section: à3mentioning

confidence: 91%

Phenomenological model of fungal biofilters for the abatement of hydrophobic VOCs

Vergara-Fernández

Hernández

Revah

2008

Biotech & Bioengineering

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“…Hexane vapors are particularly difficult to treat biologically in bacterial biofilters due to the low transfer rates from the gas to the liquid phase where biodegradation occurs (Budwill and Coleman, 1999;Devinny et al, 1999;Morgenroth et al, 1996;Zhu et al, 2004). Fungi have been found to increase elimination capacities at least twice greater than those reported with conventional bacterial biofilters (Arriaga and Revah, 2005;Spigno et al, 2003;Van Groenestijn et al, 2001) due to their higher hydrophobicity and transfer surface (Kennes and Veiga, 2004;VergaraFernandez et al, 2006).…”

Section: Introductionmentioning

confidence: 94%

Fungal removal of gaseous hexane in biofilters packed with poly(ethylene carbonate) pine sawdust or peat composites

Hernández-Meléndez

Bárzana

Arriaga

et al. 2008

Biotech & Bioengineering

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The removal of volatile organic compounds (VOC) in biofilters packed with organic filter beds, such as peat moss (PM) and pine sawdust (PS), frequently presents drawbacks associated to the collapse of internal structures affecting the long-term operation. Poly(ethylene ether carbonate) (PEEC) groups grafted to these organic carriers cross linked with 4,4'-methylenebis(phenylisocyanate) (MDI) permitted fiber aggregation into specific shapes and with excellent hexane sorption performance. Modified peat moss (IPM) showed very favorable characteristics for rapid microbial development. Water-holding capacity in addition to hexane adsorption almost equal to the dry samples was obtained. Pilot scale hexane biofiltration experiments were performed with the composites after inoculation with the filamentous fungus Fusarium solani. During the operation of the biofilter under non-aseptic conditions, the addition of bacterial antibiotics did not have a relevant effect on hexane removal, confirming the role of fungi in the uptake of hexane and that bacterial growth was intrinsically limited by an adequate performance of the composites. IPM biofilter had a start-up period of 8-13 days with concurrent CO(2) production of approximately 90 g m(-3) h(-1) at day 11. The final pressure drop after 70 days of operation was 5.3 mmH(2)O m(-1) reactor. For modified pine sawdust (IPS) packed biofilter, 5 days were required to develop an EC of about 100 g m(-3) h(-1) with an inlet hexane load of approximately 190 g m(-3) h(-1). Under similar conditions, 12-17 days were required to observe a significant start-up in the reference perlite biofilter to reach gradually an EC of approximately 100 g m(-3) h(-1) at day 32. Under typical biofiltration conditions, the physical-chemical properties of the modified supports maintained a minimum water activity (a(w)) of 0.925 and a pH between 4 and 5.5, which allowed the preferential fungal development and limited bacterial growth.

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“…Biological systems work best for the treatment of large volumes of off-gases that contain low concentrations of biodegradable contaminants [6] [7]. Several studies highlighted the dependency of successful biofiltration on Henry's law constant, meaning that the ability of microorganisms to metabolize VOCs is significantly dependent upon VOC solubility [8] [9]. For this reason, hydrophobic VOCs such as n-hexane present a unique challenge as they are not easily captured for metabolism by microorganisms growing on biofilter mediums.…”

Section: Introductionmentioning

confidence: 99%

Role of Fungal Biomass in N-Hexane Biofiltration

Botros¹,

Hassan²,

Sorial³

2017

AiM

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The biofiltration of n-hexane is studied to optimize determinants factors of hydrophobic VOC filtration efficiency. Four trickle-bed air biofilters (TBABs) were employed; two of which were supplied with nutrients buffered at a neutral pH, while another two at an acidic pH of 4 to induce and enhance fungal growth. The loading rate of n-hexane was kept constant in all TBABs at 13 g/m 3 /h. At each pH levels studied, the biomass of the TBABs was pre-acclimated using different ratios of n-hexane and methanol. The fungal biomass responsible for the degradation of n-hexane was then examined and quantified. Dichloran Rose Bengal Chloramphenicol agar was used for fungi quantification, and optical microscopy for classification. Effluent biomass was validated by measuring volatile suspended solids. Fungal counts resulting from n-hexane biodegradation were related to nitrate and carbon consumption. It was found that n-hexane elimination capacity closely followed biomass growth, and reached a steady-state at an optimum biomass density of roughly 3000 cfu/ml. Major shifts in fungal species were observed in all TBABs. Dominant fungal species grew slowly to become the most numerous, and were found to provide maximum elimination capacity, although TBABs pre-acclimated to higher methanol concentrations took less time to reach this steady-state. It was concluded, therefore, that steady and monitored growth of TBAB biomass is an essential factor in maximizing fungi's ability to metabolize VOCs and that a new ecological biofiltration model may be the most effective at VOC purification.

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Effect of Substrate Henry’s Constant on Biofilter Performance

Cited by 89 publications

References 19 publications

Phenomenological model of fungal biofilters for the abatement of hydrophobic VOCs

Phenomenological model of fungal biofilters for the abatement of hydrophobic VOCs

Fungal removal of gaseous hexane in biofilters packed with poly(ethylene carbonate) pine sawdust or peat composites

Role of Fungal Biomass in N-Hexane Biofiltration

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