1,721,005 research outputs found
Pyrolysis gaschromatography mass spectrometry of polychlorophenols and polychlorophenates
No full textKinetics of Phenol Degradation by Activated Sludge: Value of Measurements in a Batch Reactor
No full textKinetic measurements on the degradation of phenol in a batch reactor were done at 20°C using an activated sludge taken from a continuous reactor where the process had shown Monod-type kinetics without substrate inhibition. When employing a sludge sample, adapted to the substrate steady concentration Cs1, for runs with initial substrate concentration Cs0, observed batch rates were as high as expected for Cs0 = Cs1, but lower than expected in runs carried out at Cs0 > Cs11, with indications of a transient inhibitory effect instead of a positive response to the increased substrate concentration. It is concluded that kinetic data collected in a batch reactor are of limited value for the design of a continuous biodegradation process
Kinetics of Biodegradation of Mixtures Containing 2,4-Dichlorophenol in a Continuous Stirred Reactor
No full textA solution containing 2,4-dichlorophenol (DCP) and phenol (or glucose), in the ratio 1:1 in terms of carbon, was fed to a completely mixed continuous flow reactor with recycle and controlled wasting of the activated sludge, operated at steady-state conditions at 20°C. A carefully adapted sludge was able to degrade DCP, besides the accompanying substrate, with no evidence of substrate inhibition in the concentration range covered (156 mg l-1 in the influent). The reactivity order was found to be glucose ≫ phenol > DCP. The results of a series of kinetic runs with phenol + DCP were interpreted by a first-order equation for phenol and by the Monod model for DCP
Kinetics of phenol degradation by activated sludge in a continuous-stirred reactor
No full textThe rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20.0°C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked. While the latter markedly affects the rate of phenol removal, the change of sludge with another one originally different but similarly adapted influences the kinetics to a lesser extent.
The rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20. 0 degree C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked
Kinetics of Phenol Degradation by Activated Sludge in a Continuous-Stirred Reactor
No full textThe rate of phenol biodegradation by an adapted activated sludge was studied in a completely mixed, continuous-flow reactor with recycle and controlled wasting of the sludge, operated at steady-state conditions at 20.0°C. No substrate inhibition was evidenced in the concentration range covered (up to 360 mg phenol/l in the influent). The results of a series of kinetic runs at the highest influent substrate concentration were interpreted in the framework of the Monod model, obtaining the values of the kinetic parameters. The effect of different sludges and of a different influent concentration was checked. While the latter markedly affects the rate of phenol removal, the change of sludge with another one originally different but similarly adapted influences the kinetics to a lesser extent
Kinetics of Biodegradation of Phenol and 2,4-Dichlorophenol in a Continuous Stirred Reactor
No full textAnalytical characterization of municipal solid waste incinerator fly ash - Part II
No full textThe synergy of the micro FT-IR (Fourier Transform-Infrared) and SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray) techniques has been shown to be particularly helpful and effective for the characterization of inorganic compounds in fly ashes. The experimental data obtained by these techniques have been interpreted in comparison with those of other techniques, The presence of calcium carbonate, some sulfates, ammonium nitrate, calcium hydrogen phosphate, some chlorides, some oxides and aluminium silicates have been verified
A comparison between the catalytic combustion of volatile organic compounds (VOC) with and without ozone to reduce the industrial air pollution. I. Not halogenated organic compounds
No full text- …
