Performance of low pH biofilters treating a paint solvent mixture: Continuous and intermittent loading

Qi, Bing; Moe, William M.

doi:10.1016/j.jhazmat.2005.11.065

Cited by 63 publications

(30 citation statements)

References 33 publications

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“…because 8-16 h work per day or process shutdown during weekend and holidays) cause a starvation condition on the microorganism population which has been identified as one of the factors that causes reduction in the pollutant removal [12]. Qi and Moe [13] demonstrated that low pH biofilters can be started successfully under 8 h/day loading condition of a paint solvent mixture; this operation can lengthen the time interval needed to achieve high removal. Wright et al [14] operated a biofilter in flow-direction switching mode; complete removal of toluene was observed for a 4-h on/28-h off cyclic loading pattern.…”

Section: Introductionsupporting

confidence: 91%

Biofiltration of ethyl acetate under continuous and intermittent loading

et al. 2007

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A laboratory‐scale peat biofilter was used for ethyl acetate removal from an air stream over a period lasting 1 yr. In a first stage, the biofilter was operated under continuous mode: a maximum elimination capacity of 400 g m−3 h−1 was obtained, and ethyl acetate was efficiently degraded with empty bed residence time (EBRT) as short as 22 s. The estimated yield coefficient, determined from the carbon dioxide production, resulted in 0.42 g dry biomass produced per gram of ethyl acetate consumed. The living and the dead cell concentrations were also monitored. The dead cell percentages varied between 18 and 85%, progressive increases in the dead cell percentages were achieved as EBRT decreased and inlet load increased. In a second stage, operation under intermittent loading (16 h/day or 2‐h‐on/2‐h‐off cycles) was performed to investigate the effect of industrial practices such as overnight and weekend shutdowns, intermittent emission or inlet concentration and flow rate peaks. System performance was not significantly affected by changes, demonstrating the process viability for industrial applications. The intermittent loading of 16 h/day resulted in lower penetration of contaminant in the bed in comparison with continuous loading, but the 2‐h‐on/2‐h‐off caused a greater pollutant breakthrough detected at the first quarter of the biofilter, with a high increase in the dead cell density. Respirometric monitoring showed that biomass was fully activated in 1–2 h after night or weekend starvations. Finally, a 15 days starvation period was applied and afterwards operation was restarted. The system performance was fully restored without noticeable reacclimation period and dead cell density recovered normal values. © 2007 American Institute of Chemical Engineers Environ Prog, 2007

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Section: Introductionsupporting

confidence: 91%

Biofiltration of ethyl acetate under continuous and intermittent loading

et al. 2007

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“…Regular transients are the most common type due to normal cycles in process operations and scheduled maintenance activities [20,21]. Two conditions were simulated in experiment including all day closures (shut down 24 h) and weekend closures (shut down 48 h).…”

Section: Experimental Methodsmentioning

confidence: 99%

Process Performance of a Biotrickling Filter Using a Flow‐Directional‐Switching Method

Wang

et al. 2013

CLEAN Soil Air Water

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Non-uniform distribution of biomass and the accumulation of excess biomass at the inlet of a unidirectional flow biotrickling filter (UF-BTF) may lead to severe operating problems including increasing airflow resistance in packed bed, clogging, and low contaminant removal efficiencies, even performance loss. Therefore, a flow-directionalswitching biotrickling filter (FDS-BTF) was designed to improve performance such as the maximum elimination capacity and elimination efficiency. Toluene was chosen as the unique carbon source for microorganism. The results indicated that the purification performance of FDS-BTF was superior to UF-BTF. The maximum elimination capacity of FDS-BTF was up to 480 g/(m 3 h), which was 17.1% higher than that of UF-BTF. After a 50-day continuous operation, FDS-BTF attained the stable purification performance and the outlet concentrations of toluene could meet the emission standard with inlet concentrations ranging from 720 to 1100 mg/m 3 for an empty bed residence time (EBRT) of 23.9 s. The average well color development in FDS-BTF was higher than that in UF-BTF. It indicated that FDS-BTF could improve the metabolic activity, which may improve the uniform distribution of biomass along the length of packed bed. When two systems were shut down, 24 and 48 h, respectively, the time that FDS-BTF and UF-BTF needed to restore the former elimination efficiency after a shut down of 48 h were 3-4 and 9-10 h. These data indicated that the purification performance of FDS-BTF was superior to UF-BTF.

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“…Published data related to the behavior of BTFs under typical perturbations in industry (e.g., cyclic pollutant feeding, variable inlet concentration, starvation periods, and shutdowns) are relatively scarce. 23,24 Successful reacclimation of toluene-degrading BTFs has been reported after periods of up to 9 days of non-use, 25 and ethyl acetate removal in a peat biofilter after a non-use period of as much as 15 days. 26 In addition, it has been reported 8,27,28 that a buffering carbon filter installed preceding biological reactor facilitates the treatment of sudden variations in concentration, spikes, and unstable loads of VOCs.…”

Section: Technical Papermentioning

confidence: 99%

Performance of a Pilot-Scale Biotrickling Filter in Controlling the Volatile Organic Compound Emissions in a Furniture Manufacturing Facility

Martínez‐Soria

Gabaldón

Penya-Roja

et al. 2009

Journal of the Air & Waste Management Association

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A 0.75-m 3 pilot-scale biotrickling filter was run for over 1 yr in a Spanish furniture company to evaluate its performance in the removal of volatile organic compounds (VOCs) contained in the emission of two different paint spray booths. The first one was an open front booth used to manually paint furniture, and the second focus was an automatically operated closed booth operated to paint pieces of furniture. In both cases, the VOC emissions were very irregular, with rapid and extreme fluctuations. The pilot plant was operated at an empty bed residence time (EBRT) ranging from 10 to 40 sec, and good removal efficiencies of VOCs were usually obtained. When a buffering activated carbon prefilter was installed, the system performance was improved considerably, so a much better compliance with legal constraints was reached. After different shutdowns in the factory, the period to recover the previous performance of the biotrickling reactor was minimal. A weekend dehydration strategy was developed and implemented to control the pressure drop associated with excessive biomass accumulation.

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Performance of low pH biofilters treating a paint solvent mixture: Continuous and intermittent loading

Cited by 63 publications

References 33 publications

Biofiltration of ethyl acetate under continuous and intermittent loading

Biofiltration of ethyl acetate under continuous and intermittent loading

Process Performance of a Biotrickling Filter Using a Flow‐Directional‐Switching Method

Performance of a Pilot-Scale Biotrickling Filter in Controlling the Volatile Organic Compound Emissions in a Furniture Manufacturing Facility

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