Treatment of gaseous toluene in three biofilters inoculated with fungi/bacteria: Microbial analysis, performance and starvation response

Cheng, Zhuowei; Lu, Lichao; Kennes, Christian; Yu, Jianming; Chen, Jianmeng

doi:10.1016/j.jhazmat.2015.10.017

Cited by 102 publications

(31 citation statements)

References 40 publications

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“…The height of the packing layer is 500 mm, which is divided into three sections with 170 mm, 170 mm, 160 mm, so the sectional area was 9.50 x 10 -3 m 2 , and the total packing volume was 4.75 x 10 -3 m 3 . The preparation of cyclohexane was made by gas dynamic volumetric method [11] . …”

Section: Construction Of Reactor Systemmentioning

confidence: 99%

Research on Simultaneous Removal of Cyclohexane and Methyl Acetate in Biotrickling Filters

Zhanga¹,

Denga²,

Qina³

et al. 2018

International Conference of Recent Trends in Environmental Science and Engineering

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-In order to further purify two kinds of organic waste gases, methyl acetate and cyclohexane, which were difficult to be biodegraded in refinery wastewater treatment process, a new scheme for purifying mixed waste gas by bio-film construction with dominant bacteria was put forward. Because of the packing has a great influence on the performance of the bio-trickling filter (BTF) for purifying exhaust gas, the effect of two kinds of packing, namely ceramsite and volcanic rock, on cyclohexane purification was investigated. The results indicated that the filter efficiencies with two different packing were equivalent under the same conditions, but ceramsite was finally chosen as the next experimental packing because of its low weight. With activated sludge in secondary sedimentation tank from wastewater treatment plant as the original strain, the dominant degrading bacteria of methyl acetate and cyclohexane were obtained. After initial identification, a vertical BTF was startup with membrane of the dominant cyclohexane degradation bacteria Ochrobactrum intermedium. The tower can be startup quickly in 10 days, and the removal efficiency can reach over 95%. Moreover, the maximum eliminate capacity of cyclohexane was achieve 58.59 g·m -3 ·h -1 . When the reactor entered in stable phase, two kinds of methyl acetate predominant degrading bacteria, Bacillus velezensis and Ochrobactrum anthropi, were added and the methyl acetate gas was injected into the BTF. The performance of purify the mixture of cyclohexane and methyl acetate in the BTF was investigated in different operating conditions. The results showed that when the empty bed residence time was 176.6 s and 83.3 s, for cyclohexane concentration in the inlet air ranging from 50 mg·m -3 to 300 mg·m -3 , the removal efficiency was above 90%. Meanwhile, for methyl acetate concentration ranging from 300 mg·m -3 to 800 mg·m -3 , the removal efficiency was achieve 100%. The maximum eliminate capacity of the two kinds of pollutions was attain 72.99 g·m-3·h-1. In addition, the BTF was strongly resistant to impact load, and the pressure drop was remained at 5~100 pa over the entire operation time, no blockage appeared in the tower.

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Section: Construction Of Reactor Systemmentioning

confidence: 99%

Research on Simultaneous Removal of Cyclohexane and Methyl Acetate in Biotrickling Filters

Zhanga¹,

Denga²,

Qina³

et al. 2018

International Conference of Recent Trends in Environmental Science and Engineering

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“…Various studies indicate that the elimination capacity (EC) of fungal biofilters (F‐BFs) was 2‐fold or greater relative to the EC of bacterial biofilters (B‐BFs) . However, F‐BFs have certain drawbacks, such as the longer start‐up periods, because fungi have lower metabolic rates than aerobic bacteria . Moreover, filamentous hyphae produced by fungi eventually lead to channeling and clogging problems in biofilters .…”

Section: Introductionmentioning

confidence: 99%

“…Building a highly efficient biofiltration system is critical for hydrophobic VOCs control. According to recent reports, the fungal and bacterial biofilter (F&B‐BF) exhibited markedly higher performance for hydrophobic VOCs removal and odor removal than did conventional biofilters …”

Section: Introductionmentioning

confidence: 99%

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A comparative study of bacterial and fungal‐bacterial steady‐state stages of a biofilter in gaseous toluene removal: performance and microbial community

Zhai

Shi

Zhu

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Traditional biofilters can lack efficiency in removing hydrophobic volatile organic compounds (VOCs) due to their low gas‐to‐liquid phase transfer rates. The aim of this research was to construct a high‐performance biofilter for toluene removal, compare the degradation performance with that of a traditional biofilter and reveal the relationship between the microbial community and operational performance with different operational parameters. RESULTS The results illustrate that compared with conventional biofilters, the removal efficiency (RE) and the maximum elimination capacity (ECmax) of the high‐performance, fungal and bacterial biofilter (F&B‐BF) increased by 19.6% and 18 g toluene m‐3 h‐1, respectively. The bed pressure drop (ΔP/H) decreased by 1.6 cm H2O m‐1 at an empty bed residence time (EBRT) of 45 s at pH 4.0 and using nitrate (NO3‐) as a nitrogen source. CONCLUSION Low pH values could properly inhibit bacterial growth and progressively allow fungi to predominate in the biofilm. The degrading capabilities of fungi and bacteria were coupled to improve the biofilter performance in toluene removal. Using NO3‐ as the nitrogen source could control the biofilms' overgrowth and reduce the ΔP/H value. The experimental data analysis showed that the fungal genus Phialophora and the bacterial genus Alicyclobacillus played key roles in toluene and phenol degradation, respectively. © 2017 Society of Chemical Industry

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“…Since then several studies have come to conclude that fungi are correlated with increased VOC metabolization, both hydrophobic and otherwise [14]. As such, many have attempted to increase the efficiency of these fungal biofilters [17] [18] [19], as well as characterize the traits that make these fungi more efficient at metabolizing VOCs [11] [21]. For the most part, these studies have concluded varied effects on VOC elimination capacity due to the utilization of a microbial consortium.…”

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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Treatment of gaseous toluene in three biofilters inoculated with fungi/bacteria: Microbial analysis, performance and starvation response

Cited by 102 publications

References 40 publications

Research on Simultaneous Removal of Cyclohexane and Methyl Acetate in Biotrickling Filters

Research on Simultaneous Removal of Cyclohexane and Methyl Acetate in Biotrickling Filters

A comparative study of bacterial and fungal‐bacterial steady‐state stages of a biofilter in gaseous toluene removal: performance and microbial community

Role of Fungal Biomass in N-Hexane Biofiltration

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