Einsatz eines Suspensions‐Airlift‐Schlaufenreaktors zur Reinigung problematischer Abwässer

Mixtures of phenol-formaldehyde-resin and pressed olive stones in a weight ratio of 20/80 were cured as small cylinders and then pyrolyzed. Some samples were also activated by steam. For these specimens and for two commercial activated caobons of laboratory or industrial uses the specific surface area, the structure, the adsorption properties, and the adsorption capacity were determined. The results indicate that the carbonaceous material produced by activation has greater values for the examined properties in comparison to the only pyrolyzed and the two commercial activated carbons, respectively. It was found that the Freundlich-equation is valid for the adsorption of 4-nitrophenol on all carbonaceous materials examined. The produced carbonaceous materials have different kinds of pores than the commercial activated carbons. The experimental results are explained with regard to the molecular dimensions of the adsorptive substances and the polarization effect of the substituents of the benzene ring. 0 1988 Hilthig& Wepf Verlag, Basel

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Adsorption of phenols on carbonaceous adsorbents produced from phenol‐formaldehyde‐resin mixed with olive stones

Simitzis

Sfyrakis

1988

Angew. Makromol. Chem.

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Biodegradation by immobilized bacteria in an airlift‐loop reactor—influence of biofilm diffusion limitation

Wagner

Hempel

1988

Biotech & Bioengineering

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Naphthalene-2-sulfonate was degraded by submerse growing Pseudomonads in a chemostat culture. The kinetic parameters for the Monod equation, including Pirts maintenance energy, were calculated from these experiments regarding naphthalene-2-sulfonate as substrate and oxygene as cosubstrate. By immobilizing the bacteria on sand particles, the degradation of naphthalene-2-sulfonate was carried out in a specialy designed three-phase airlift-loop reactor in a completely fluidized state. From these experiments, the influence of biofilm diffusion limitation on reaction kinetics and criteria for stable biofilm formation on sand particles were obtained.

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Sorptionscharakteristik und Hydrodynamik in zwei‐ und dreiphasig betriebenen Airlift‐Schlaufenreaktoren

Lindert

Hamschmidt

Hempel

1990

Chemie Ingenieur Technik

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Bei der aeroben Reinigung spezieller industrieller Abwasser bietet es sich in vielen Fallen an, auf Tragerpartikeln immobilisierte Biomasse in Airlift-Reaktoren einzusetzen [l, 21. Diese verbinden in denkbar einfacher Weise Sauerstoff-Versorgung und Durchmischung im Reaktor. Die in dieser Arbeit vorgestellten Untersuchungen zur Auslegung technischer Reaktoren zur Abwasserbehandlung wurden an einem 80-1-und einem 800-1-Airlift-Schlaufenreaktor (ASR) durchgefuhrt. Abb. 1 zeigt eine Prinzipskizze . Zunachst wurden iiber das Reaktorvolumen gemittelte Daten wie Umlaufgeschwindigkeit , Gasgehalt und Stoffiibergangskoeffizienten erfaat. Die in den Diagrammen hierfiir verwendeten dimensionslosen KenngroRen sind in Tab. 1 definiert. Abb. 2 verdeutlicht, daR der Fliissigphaseumlauf mit steigender Begasung zunimmt, mit steigender Widerstandszahl des Umlaufs dagegen fallt. Sehr deutlich ist der Unterschied zwischen denr,' \/ I Abb. 1. Prinzipskizze der Airlift-Schlaufenreaktoren (ASR). MFM Mass Flow Meter, p DruckmeRstellen, x LeitfahigkeitsmeRstellen, 0 2 MeRstellen der Sauerstoff-Konzentration; V = 80 1: dl = 0,15 m, dz = 0,042 m, H = 2,9 m; V = 800 1: d l = 0,3 m, d2 = 0,l m, H = 7,9 m.

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Einsatz eines Suspensions‐Airlift‐Schlaufenreaktors zur Reinigung problematischer Abwässer

Cited by 7 publications

References 7 publications

Adsorption of phenols on carbonaceous adsorbents produced from phenol‐formaldehyde‐resin mixed with olive stones

Adsorption of phenols on carbonaceous adsorbents produced from phenol‐formaldehyde‐resin mixed with olive stones

Biodegradation by immobilized bacteria in an airlift‐loop reactor—influence of biofilm diffusion limitation

Sorptionscharakteristik und Hydrodynamik in zwei‐ und dreiphasig betriebenen Airlift‐Schlaufenreaktoren

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