Impact of biocatalyst and moisture content on toluene/xylene mixture biofiltration

Klapkova, Eva; Halecky, Martin; Fitch, Mark W.; Soccol, Carlos Ricardo; Páca, Jan

doi:10.1590/s1516-89132006000300020

Cited by 5 publications

(5 citation statements)

References 9 publications

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“…During the first phase the REs were only due to packing materials adsorption. This result is consistent with the findings of the Klapková et al (2006) study. These efficiency values were maintained during the first phases since the BFs were aerated at night (during the experiments) for 12 h with the minimum flow and pollutant concentration.…”

Section: Toluene Removal Efficiency In Both Bfssupporting

confidence: 93%

“…Figures 4 and 5 illustrate a slight increase in the pressure drop curves during the two stages of the operation, which indicates the subsidence and compression of the bed especially in the first phase of the experiments (Chen et al 2013;Estrada et al 2013b;Klapková et al 2006). In addition, the formation and gradual growth of the biomass and mycelium cause partial obstruction of the pores of the media, and it is a factor in the more pressure drop during the second phases in two stages (Dorado et al 2012;Padhi and Gokhale 2014;Schiavon et al 2016).…”

Section: Bed Pressure Drop In Both Experimentsmentioning

confidence: 95%

“…However, the adaptation period was not long in this study since the pre-adapted microorganisms were used (Amin et al 2014). The adaptation time in other studies ranges from a few days to a few weeks and a month (Estrada et al 2013a;Klapková et al 2006;Novak et al 2008).…”

Section: Toluene Removal Efficiency In Both Bfsmentioning

confidence: 96%

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A comparison of biofiltration performance based on bacteria and fungi for treating toluene vapors from airflow

et al. 2020

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With increasing concerns about industrial gas contaminants and the growing demand for durable and sustainable technologies, attentions have been gradually shifted to biological air pollution controls. The ability of Pseudomonas putida PTCC 1694 (bacteria) and Pleurotus ostreatus IRAN 1781C (fungus) to treat contaminated gas stream with toluene and its biological degradation was compared under similar operating conditions. For this purpose, a biofilter on the laboratory scale was designed and constructed and the tests were carried out in two stages. The first stage, bacterial testing, lasted 20 days and the second stage, fungal testing, lasted 16 days. Inlet loading rates (IL) for bacterial and fungal biofilters were 21.62 ± 6.04 and 26.24 ± 7.35 g/m 3 h respectively. In general, fungal biofilter showed a higher elimination capacity (EC) than bacterial biofilter (18.1 ± 6.98 vs 13.7 ± 4.7 g/m 3 h). However, the pressure drop in the fungal biofilter was higher than the bacterial biofilter (1.26 ± 0.3 vs 1 ± 0.3 mm water), which was probably due to the growth of the mycelium. Fungal biofiltration showed a better performance in the removal of toluene from the air stream.

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Section: Toluene Removal Efficiency In Both Bfssupporting

confidence: 93%

Section: Bed Pressure Drop In Both Experimentsmentioning

confidence: 95%

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A comparison of biofiltration performance based on bacteria and fungi for treating toluene vapors from airflow

et al. 2020

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“…In the presence of moisture in the SCAS, FA can react with water to form methylene glycol and this affects the BTFR performance. A moisture content of about 70% has reported in a previous study 39 to be optimal for an effective biofiltration process and plays an important role in reaching high values of VOC removal efficiency.…”

Section: Analysis Of Fa Removal Efficiency For the Different Experimentsmentioning

confidence: 99%

Calculation of optimal gas retention time using a logarithmic equation applied to a bio-trickling filter reactor for formaldehyde removal from synthetic contaminated air

2013

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Formaldehyde (FA) removal from contaminated air has been extensively studied using a bio-trickling filter reactor (BTFR). However, the effect of different volumetric air flow rates (VAFRs) on FA removal efficiency needs to be verified for better BTFR design with optimal operating conditions. This study uses a laboratoryscale BTFR, operating with the three different VAFRs to remove FA from synthetic contaminated air.Mathematical models to determine the optimal retention time of contaminated air flow through the BTFR system are developed. The effect of different pH values on the FA removal efficiency is evaluated. FA removal efficiencies of 99, 96 and 95% are verified for VAFRs of 90, 291 and 1512 L h 21 , respectively.Optimal retention times of 141, 50 and 26 s are verified for BTFR experiments operating at 90, 291 and 1512 L h 21 VAFR, respectively. The logarithmic models are proposed as a new approach for determining the optimal retention time and hoped to make a significant contribution to future biotechnological developments and air quality improvement analysis.

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“…The microbial activity in biofilters is highly dependent on the moisture content of the filter bed. Therefore, maintaining an appropriate moisture content of the packing material is essential for its effectiveness [4]. Controlling the moisture content of the bed material is a critical aspect of biofilter operation [5].…”

Section: Introduction mentioning

confidence: 99%

Relationship between Moisture Behavior and Gaseous Volatile Organic Compounds Removal in a Biofiltration System

Mansoori¹,

Mori²,

Higuchi³

2017

JESE-B

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Studies on the relationship between moisture behavior and gaseous VOCs (Volatile Organic Compounds) removal efficiency of packed tower biofilters are limited. In this research, the nutrient holding capacity, moisture evaporation rate and gaseous toluene and MEK (Methyl Ethyl Ketone) removal efficiencies of bioreactors with porous synthetic resin as the packing material were simultaneously observed. The nutrient holding capacity in one of the reactors was higher than those of the other two because its packing layer was frequently supplied with a nutrient solution by soaking. This reactor exhibited the highest toluene removal efficiency. However, excessive biomass growth was observed in this reactor. The reactor with a less frequent supply of nutrient solution by soaking showed a slightly lower toluene removal efficiency, possibly due to lack of nutrients in the packing layer. The reactor that was fed with the nutrient solution by spraying it onto the packing layer (a common method for supplying moisture) had the lowest toluene removal efficiency, mainly because of the uneven distribution of nutrients. Moreover, the moisture evaporation rate in the packing layer during moisture supply and heat balance were determined.

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Impact of biocatalyst and moisture content on toluene/xylene mixture biofiltration

Abstract: ABSTRACT

Cited by 5 publications

References 9 publications

A comparison of biofiltration performance based on bacteria and fungi for treating toluene vapors from airflow

A comparison of biofiltration performance based on bacteria and fungi for treating toluene vapors from airflow

Calculation of optimal gas retention time using a logarithmic equation applied to a bio-trickling filter reactor for formaldehyde removal from synthetic contaminated air

Relationship between Moisture Behavior and Gaseous Volatile Organic Compounds Removal in a Biofiltration System

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