CO2 Response to Doses of Organic Solvents Biodegraded in a Batch Biofilter

Fang, Yuanxiang; Govind, Rakesh

doi:10.1007/s11270-006-9107-0

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Alternatively, monitoring biomass accumulation by determining the active and inert biomass fractions by means of counting cell numbers or protein assays [12,13] are tortuous tasks and very sensible to the distribution and heterogeneity of biomass. Complementary, carbon dioxide production, as a result of oxidation of organic compounds by microorganism activity has been used satisfactorily in several studies [14,15] to assess biomass excess and attend stable long-term performance. Therefore, 4 simultaneous measurement of several parameters could be a complete and real solution to monitor biomass accumulation and to evaluate which conditions affect microorganisms activity and growth.…”

Section: Introductionmentioning

confidence: 99%

Biomass accumulation in a biofilter treating toluene at high loads – Part 1: Experimental performance from inoculation to clogging

Dorado

Baeza

Lafuente

et al. 2012

Chemical Engineering Journal

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Biomass accumulation was studied in a biofilter packed with an organic/inorganic, hybrid packing material made of clay pellets plus clay pellets covered by a thin layer of compost and inoculated with activated sludge from a municipal WWTP. Operating conditions under high loads of toluene were selected to force plant failure by clogging. The biofilter achieved a remarkably maximum elimination capacity of 595 g toluene •m-3 •h-1 (1280 g toluene•m-3 •h-1 based on the first 25 cm of the biofilter). The evolution of biofilter performance and biomass growth over the packing material were studied until the reactor collapsed. Several variables related to biomass growth such as reactor weight, oxygen consumption, CO 2 production, substrate removal and pressure drop were monitored. Alternated periods of substrate supply and starvation were tested to assess biomass growth and detachment. Moreover, pH and biomass content were periodically measured in the leachate to determine the washing efficiency of intermittent watering. Pressure drop measurements demonstrated that watering was an effective technique to wash the excess of biomass accumulated. Experimental data also permitted to determine important parameters for biofilter modeling as the biomass growth yield and the stoichometric coefficients of toluene biological oxidation. Variables monitored are sensitive to biomass accumulation

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Section: Introductionmentioning

confidence: 99%

Biomass accumulation in a biofilter treating toluene at high loads – Part 1: Experimental performance from inoculation to clogging

Dorado

Baeza

Lafuente

et al. 2012

Chemical Engineering Journal

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Biofiltration of simulated air pollutants from distillers dried grains with solubles (DDGS) dryer vents at corn‐derived ethanol production facilities

Chen

Bangs

Kinney

et al. 2010

Env Prog and Sustain Energy

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The DDGS dryer vents at corn-derived ethanol production facilities often contain a mixture of odorous and/or potentially hazardous air pollutants including acetaldehyde and formaldehyde. The objective of this study was to investigate the feasibility of utilizing a biofilter system to treat the volatile organic compounds (VOCs) released from the DDGS dryer stack during ethanol production. Single aldehyde elimination capacity experiments indicate that both acetaldehyde and formaldehyde are readily biodegraded in a biofilter at a short contact time of 10 s, although the acetaldehyde removals during the initial start up period were lower than those observed during later operation. A biofilter packed with porous silicate pellets at neutral pH successfully achieved greater than 90% removal of VOC mixtures containing acetaldehyde, formaldehyde, ethanol, and acetic acid. However, extended operation with the four component VOC mixture led to a decline in biofilter pH. At low pH (4.6), acetaldehyde removal declined from 95 to 62% and ethanol removal declined from 90 to 57%. The option of utilizing a water scrubber upstream of the biofilter to remove acetic acid was investigated; it was determined that effective acetic acid removal was possible in a recirculating water scrubber maintained at a pH level above $7, where the rate of removal was controlled by gas phase mass transfer resistance.

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Effect of oil concentration and residence time on the biodegradation of α-pinene vapours in two-liquid phase suspended-growth bioreactors

Montes

Veiga

Kennes

2012

Journal of Biotechnology

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Recently, research on the use of binary aqueous-organic liquid phase systems for the treatment of polluted air has significantly increased. This paper reports the removal of α-pinene from a waste air stream in a continuous stirred tank bioreactor (CSTB), using either a single-liquid aqueous phase or a mixed aqueous-organic liquid phase. The influence of gas flow rate, load and pollutant concentration was evaluated as well as the effect of the organic to aqueous phase ratio. Continuous experiments were carried out at different inlet α-pinene concentrations, ranging between 0.03 and 25.1 g m⁻³ and at four different flow rates, corresponding to residence times (RTs) of 120 s, 60 s, 36 s and 26 s. The maximum elimination capacities (ECs) reached in the CSTB were 382 g m⁻³ h⁻¹ (without silicone oil) and 608 g m⁻³ h⁻¹ (with 5%v/v silicone oil), corresponding to a 1.6-fold improvement using an aqueous-organic liquid phase. During shock-loads experiments, the performance and stability of the CSTB were enhanced with 5% silicone oil, quickly recovering almost 100% removal efficiency (RE), when pre-shock conditions were restored. The addition of silicone oil acted as a buffer for high α-pinene loads, showing a more stable behaviour in the case of two-liquid-phase systems.

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CO2 Response to Doses of Organic Solvents Biodegraded in a Batch Biofilter

Cited by 3 publications

References 30 publications

Biomass accumulation in a biofilter treating toluene at high loads – Part 1: Experimental performance from inoculation to clogging

Biomass accumulation in a biofilter treating toluene at high loads – Part 1: Experimental performance from inoculation to clogging

Biofiltration of simulated air pollutants from distillers dried grains with solubles (DDGS) dryer vents at corn‐derived ethanol production facilities

Effect of oil concentration and residence time on the biodegradation of α-pinene vapours in two-liquid phase suspended-growth bioreactors

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