Biological treatment characteristics of benzene and toluene in a biofilter packed with cylindrical activated carbon

Li, G.-W.; Hu, Hong-Ying; Hao, Jiming; Zhang, H.-Q.

doi:10.2166/wst.2002.0716

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Under this reaction limited zone, kinetic inhibition seemed to occur when the reactor was exposed to higher OLs (> 40 g m' 3 -reactor h" 1 ), with a subsequent decrease in EC. A similar behaviour has been observed during the biological treatment of benzene and toluene in a biofilter [26].…”

Section: Treatment Inhibitionsupporting

confidence: 78%

Biological treatment of a contaminated gaseous emission containing monochlorobenzene

Rangel¹,

Castro²,

Jorge³

2003

Environmental Technology

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This study presents the operation of a biotrickling filter when treating a monochlorobenzene (MCB) contaminated gaseous emission. Treatment dynamics were characterised by exposing the reactor to various MCB Organic Loads (OL). The use of different growth support materials, namely limestone, sand, ceramic and PVC pall-rings, was investigated. Limestone led to dogging of the reactor due to the accumulation of surface precipitates, but PVC pall-rings allowed for a uniform biofilm growth. The biotrickling filter presented maximum removal efficiency (RE, 95%) under OL regimes of 10 g m(-3)-reactor h(-1). Treatment inhibition was observed when the reactor was exposed to OL of 45 g m(-3)-reactor h(-1), with RE reaching a minimum value (8%) and elimination capacity of 8 g m(-3)-reactor h(-1). The first half of the reactor height was the predominant section for MCB biodegradation and increasing the mineral medium recirculation rate was beneficial for the overall treatment.

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Section: Treatment Inhibitionsupporting

confidence: 78%

Biological treatment of a contaminated gaseous emission containing monochlorobenzene

Rangel¹,

Castro²,

Jorge³

2003

Environmental Technology

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“…There was a trend of increasing elimination capacity with increasing inlet loading and then reaching a constant level, which was named as the maximum elimination capacity. The maximum elimination capacity of toluene in the low pH biofilter was 205 g/m 3 Á h according to the curve, which was higher than 55-165 g/m 3 Á h in some reported publications (Li et al, 2002;Delhoménie et al, 2002;Chang, 2003). Figure 5b shows the relationship of the H 2 S elimination capacity with the inlet loading.…”

Section: Elimination Capacitymentioning

confidence: 57%

Application of biological activated carbon as a low pH biofilter medium for gas mixture treatment

Liu

Chiaw

Ning

2006

Biotech & Bioengineering

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Packing material is a crucial component of a bioreactor as it is the microbial population's habitat. This study assessed potential improvements to current biofiltration processes by investigating use of a novel support medium. Biological activated carbon (BAC) with microorganisms growing on granular activated carbon can produce a novel medium in which both adsorption and biodegradation contribute to pollutants removal. Investigation of carbon characteristics demonstrated that BAC was an ideal packing medium for biofiltration. The application of the novel packing medium for gas mixture treatment was evaluated in a low pH biofilter. Results demonstrated that BAC biofilter obtained high removal efficiency for both H(2)S and toluene. The removal mechanisms of BAC were investigated after the biofilter operation and it demonstrated that the performance of the BAC system was mainly controlled by the additive contributions of two removal mechanisms - adsorption and biodegradation. This study also indicated the potential for simultaneous treatment of hydrogen sulfide and toluene at low pH condition.

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“…The RE was subsequentially decreased to ca 60%, suggesting that the reactor was under a diffusion-limited regime. 13 The VPB was then exposed to another 2 weeks' starvation period (day 57), with no MM recirculation through the filter bed. Subsequently, the VPB was exposed to the previous OL (ca 11 g h −1 m −3 of reactor), and within 1 day the reactor recovered the RE values of 75%.…”

Section: Vpb Operation At Laboratory-scalementioning

confidence: 99%

Biological treatment of a contaminated gaseous emission from a paint and varnish plant—from laboratory studies to pilot‐scale operation

Castro

Jorge

2003

J of Chemical Tech & Biotech

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A Vapour-Phase Bioreactor (VPB), namely a biotrickling filter, was scaled-up and operated insitu for the treatment of gaseous emissions from a paint and varnish industrial plant. A microbial culture able to degrade the target compounds was enriched and a laboratory-scale VPB was established in order to evaluate the treatment's performance. The VPB presented removal efficiencies higher than 90% when exposed to Organic Loads (OL) of ca 50 g h −1 m −3 of reactor. The VPB was exposed to dynamic conditions often found in-situ (eg night and weekend shutdown periods) and showed a fast capacity to recover, with and without mineral medium recirculation. After a prolonged interruption period (10 months), the VPB was not able to cope with OL of ca 25 g h −1 m −3 of reactor and re-inoculation was required in order to recover the treatment performance. The VPB also showed limited treatment when exposed to higher OL (ca 500 g h −1 m −3 of reactor). The VPB was then scaled-up and a 3 m 3 VPB was operated in-situ, showing removal efficiencies higher than 50% when exposed to an OL of c 5 g h −1 m −3 of reactor, thus complying with current legal demands. The addition of a maintenance feed was shown to be a useful tool for VPB pilot-scale operation when shutdown periods occurred. A factorial design of experiments was carried out, which allowed reduction to one-tenth of the initial supply of the main mineral medium constituents, namely phosphate buffer, ammonium and magnesium salts, and also elimination of the metal supplement. Overall, the VPBs were shown to be robust equipment, being able to respond actively to dynamic treatment scenarios, particularly night and weekend shutdown periods.

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Biological treatment characteristics of benzene and toluene in a biofilter packed with cylindrical activated carbon

Cited by 6 publications

References 8 publications

Biological treatment of a contaminated gaseous emission containing monochlorobenzene

Biological treatment of a contaminated gaseous emission containing monochlorobenzene

Application of biological activated carbon as a low pH biofilter medium for gas mixture treatment

Biological treatment of a contaminated gaseous emission from a paint and varnish plant—from laboratory studies to pilot‐scale operation

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