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Validity of actinometry to monitor oxygen atom concentration in microwave discharges created by surface wave in O2-N2 mixtures (1994)

Granier, A. ; Chéreau, D. ; Henda, K. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 104-114

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The validity of actinometry to monitor oxygen atom concentration in O2-N2 microwave discharges created by surface wave is investigated. The plasma is created with a gas flow in a quartz tube of inner diameter 16 mm at pressures in the Torr range. First, it is shown that the reliability of actinometry can be deduced from the longitudinal profile of the actinometry signal. Second, absolute concentrations of oxygen atoms are estimated from the experimental actinometry signal and agree satisfactorily with concentrations simultaneously measured by vacuum ultraviolet (VUV) absorption downstream from the plasma. Moreover, upon varying the nitrogen percentage (0%–100%), it is evidenced that the actinometry signal is proportional to the concentration measured by VUV absorption. Furthermore, it is evidenced that the oxygen dissociation rate is only 2% in pure oxygen plasmas, while it reaches 15% (433 MHz) or 30% (2450 MHz) for mixtures containing more than 20% of nitrogen. This drastic increase in [O] upon the addition of N2 is extensively discussed and, finally, attributed to a decrease in the recombination frequency of oxygen atoms on the quartz wall, in the presence of nitrogen.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.355897

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A new pilot reactor for solid-state fermentation: Application to the protein enrichment of sugar beet pulp (1988)

Durand, A. ; Chereau, D.

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 31 (1988), S. 476-486

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: A new pilot reactor for solid-state fermentation has been used for single-cell protein production on raw sugar beet pulp with a mutant, Trichoderma viride T.S. This pilot plant, having a maximum working capacity of one ton (ca. 200 kg dry matter) can be scaled up to the production plant level. During the process, the protein content increases from 9 to 20-21% (on the basis of dry matter) in 48 h. A material and heat balance is presented in relation with temperature and moisture level regulation during the process.

Additional Material: 10 Ill.