Pervaporation-biological oxidation hybrid process for removal of volatile organic compounds from wastewaters

Oliveira, Teresa A.C.; Scarpello, Justin T.; Livingston, Andrew G.

doi:10.1016/s0376-7388(01)00555-5

Cited by 31 publications

(15 citation statements)

References 23 publications

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“…Moreover, the diffusion coefficient of all components in the liquid augments as the operating temperature is raised. Therefore, K L increases with the operating temperature [113,117].…”

Section: Mathematical Modelingmentioning

confidence: 97%

Pervaporative recovery of volatile aroma compounds from fruit juices

Pereira

Ribeiro

Nóbrega

et al. 2006

Journal of Membrane Science

106

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“…Moreover, the diffusion coefficient of all components in the liquid augments as the operating temperature is raised. Therefore, K L increases with the operating temperature [113,117].…”

Section: Mathematical Modelingmentioning

confidence: 97%

Pervaporative recovery of volatile aroma compounds from fruit juices

Pereira

Ribeiro

Nóbrega

et al. 2006

Journal of Membrane Science

106

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“…We have observed in an experiment that a bioreactor treating a gas stream containing MCB showed a sudden perturbation between steady states when one of the parameters was slightly changed (Oliveira et al, 2001). It seemed that under certain conditions, small changes in the operating conditions caused large differences in the equilibrium states attained.…”

Section: Introductionmentioning

confidence: 99%

Bioscrubbing of waste gas—substrate absorber to avoid instability induced by inhibition kinetics

Oliveira¹,

Livingston²

2003

Biotech & Bioengineering

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The stability of a continuous stirred tank bioreactor treating a gas stream containing monochlorobenzene (MCB) was studied theoretically and experimentally. A bioreactor inoculated with Pseudomonas sp. strain JS150 was submitted to successive step disturbances in the MCB load, inducing washout and system instability. With time, and subject to high MCB concentrations in the biomedium, the microorganisms appeared to adapt to high MCB load, and needed increasingly severe shocks to induce washout. To improve the bioreactor stability, the influence of an MCB-absorber prior to the bioreactor was investigated, using silicone oil as the absorbent for MCB. A parallel was established with the first set of experiments (no absorber). Phase plane plots showed how the presence of the absorber changed the system trajectories from washout into stable pseudo-steady states. Experimental results confirmed the benefits of the absorber in avoiding washout under high MCB loads. At periods of low loading, MCB was desorbed from the absorber. For the same loading conditions, removal efficiencies were much higher than when no absorber was present. Elimination capacities observed in the bioreactor were much higher than those previously reported for biotrickling filters treating MCB containing gas streams: 300 to 450 g m(-3) h(-1). Gas inlet concentrations were in the range 12 to 65 g m(-3), well above the 5 g m(-3) upper limit usually suggested for biological treatment of waste gases, showing that highly concentrated gas streams may be biologically treated so long as inhibitory concentrations are not reached in the bioreactor.

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“…Therefore, they have the highest loss to the effluent according to the other types of dyes, and up to 50% of color is discharged in the effluent from reactive dyeing operations. Pagga and Brown (1986) also reported that only 47% of 87 dyestuffs are biodegradable due to insoluble dyes having low biodegradability. Studies on dye bath wastewater treatment with membrane technology started in the 1970's with MF, UF and RO membranes.…”

Section: Treatment Of Colored Wastewatermentioning

confidence: 99%