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Biooxidation of a synthetic waste by a microbial film grown on the liquid surface in a shallow flow reactor

  • Kiyoshi Toda
  • Mitsunori Miyake
  • Hisao Ohtake
Article

Abstract

A new process of biological waste treatment was developed by use of microbial films grown on the liquid surface in a shallow flow reactor. The performance of this process was tested using a synthetic waste that contained acetic acid as a model organic pollutant. About 90% of acetic acid (10,000 mg/L-1) in the synthetic waste was removed by settinga τ: (a specific liquid surface area, cm-1, andτ: hydraulic liquid detention time, h) higher than 15 cm-1/h. It was necessary to maintaina large enough (more than 10 cm-1 in most cases) to satisfy oxygen demand for the biooxidation. The oxygen balance and TOC determinations showed that the acetic acid removed was completely oxidized with oxygen transferred through the liquid surface. This process would contribute to energy savings, since it requires no forced aeration for oxygen supply.

Index Entries

Microbial film surface culture biooxidation of acetic acid oxygen transfer through liquid surface Acetobacter sp. 

Nomenclature

A

Liquid-surface area, cm2

a

Specific liquid-surface area, cm-1

Cs

Saturated DO concentration, g-O2/cm-3 or g-O2/L-1

E

Dispersion coefficient of waste flow, cm2/h-1

F

Volumetric flow rate of influent and effluent, cm3/h-1

HL

Liquid height of SF reactor, cm

Ks

Saturation constant for acetic acid, g-acetic acid L-1

Ka

Apparent reaction constant, cm/h-1

kf

Specific rate of acetic acid removal based on liquid-surface area, g-acetic acid cm-2/h-1

kL

Oxygen transfer coefficient, cm/h-1

kLa

Volumetric oxygen transfer coefficient, h-1

L

Nominal length of open channel type SF reactor, cm

S

Acetic acid concentration of effluent flow, g/L-1

Si

Acetic acid concentration of influent flow, g/L-1

u

Linear flow rate of liquid, cm/h-1

V

Liquid volume in a reactor, cm2

Z

Sodium sulfite concentration of effluent, g/L-1

Zi

Sodium sulfite concentration of influent, g/L-1

Greeks

σ

Standard deviation of residence time of liquid element in reactor, h

τ

Hydraulic liquid detention time in SF reactor, h

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Copyright information

© Humana Press Inc. 1990

Authors and Affiliations

  • Kiyoshi Toda
    • 1
  • Mitsunori Miyake
    • 1
  • Hisao Ohtake
    • 1
  1. 1.Institute of Applied MicrobiologyUniversity of TokyoTokyoJapan

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