Removal of Acetaldehyde and Propionaldehyde from Waste Gas in Packed Column with Immobilized Activated Sludge Gel Beads

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概要

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• A new type of waste gas treatment was previously proposed in the packed column containing the immobilized activated sludge gel beads of 5 mm in diameter together with the hollow plastic balls of 10 mm in the optimal diameter with their optimal volume ratio of 1 to 2 to avoid compaction of the gel beads. The same type of biofilter is employed and analyzed for removal of acetaldehyde or propionaldehyde as a model of toxic and malodorant pollutants under a wide range of the inlet aldehyde concentrations. The same spherical gel beads as prepared previously by the PVA-boric acid method are stable and durable during storage as well as use in the removal operation. The biofilter gives a very low pressure drop to the waste gas stream through the packed bed. The acetaldehyde or propionaldehyde removal in the column decreases with an increase in the inlet aldehyde concentration. The kinetics data on the gel beads suspended in an air-tight batch reactor reveal that the Michaelis-Menten type rate equation is applicable to both respiration and pollutant biodegradation by the gel beads with negligible mass transfer effect. A model for removal of a single pollutant is developed assuming that the Henrys law constant determines the dissolved pollutant concentration in the gel bead, the pollutant is biodegraded according to the above rate equation and the contact efficiency of gel beads with waste gas has the same value of 0.24 as determined previously. The observed removals agree well with those calculated from the design equation developed. As a result the observed decrease in removal of aldehyde with its inlet concentration is due to the fact that the biodegradation rate itself approaches asymptotically the maximum one with the aldehyde concentration.

• 社団法人 化学工学会の論文

著者

• Yamamoto Masaya

  Department of Cardiology, Toho university Ohashi medical center

• NAKAO Katsumi

  Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi Universi

• FUKUNAGA KIMITOSHI

  Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi Universi

• Yamamoto Masaya

  Department Of Applied Chemistry And Chemical Engineering Yamaguchi University

• IBARAHIM Mohd

  Department of Applied Chemistry and Chemical Engineering, Yamaguchi University

• YASUDA Yoshimasa

  Department of Applied Chemistry and Chemical Engineering, Yamaguchi University

• Ibarahim Mohd

  Department Of Applied Chemistry And Chemical Engineering Yamaguchi University

• Nakao Katsumi

  Department Of Applied Chemistry And Chemical Engineering Faculty Of Engineering Yamaguchi University

• Nakao Katsumi

  Department Of Applied Chemistry And Chemical Engineering Yamaguchi University

• Yasuda Yoshimasa

  Department Of Applied Chemistry And Chemical Engineering Yamaguchi University

• Fukunaga Kimitoshi

  Department Of Applied Chemistry And Chemical Engineering Yamaguchi University

• Yamamoto Masaya

  Department Of Anatomy And Histology School Of Medicine Fukushima Medical University

• Ibrahim Mohd

  Department of Applied Chemistry and Chemical Engineering, Yamaguchi University

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