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KMID : 0380019950100030241
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Korean Journal of Biotechnology and Bioengineering
1995 Volume.10 No. 3 p.241 ~ p.248
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Degradation of Polyvinyl Alcohol in Dye-Processing Wastewater by Agar-Acrylamide Microbial Immobilization Method
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Abstract
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For the treatment of poorly biodegradable polyvinyl alchol (PVA) in dye-processing wastewate;immobilized microbial beads were prepared by using agar-acrylamide method. PVA removal efficiency for the synthetic wastewater was 85% at the PVA volume loading rate of 3.1g// -day. In case of real desizing wastewate;PVA removal efficiency was 81.3% at the PVA volume loading rate of 3.25g// .day. In observation of cross section of immobilized bead passed 5 months with diameter of 2.4mm, the growth of cell was limited by the resistance of substrate and oxygen tranfer for the inner region of more than 48% of bead radius from the surface. It was estimated that 70% of total removed PVA was degraded by the immobilized cells in the continuous immobilized reactor. Substrate utilization rate in the suspended reactor was decreased with increasing dilution rates above 0.083 hr-;but that in the immobilized reactor was increased with increasing dilution rates up to 0.125hr-´. The substrate removal efficiency of immobilized reactor was much superior to that of suspended reactor with increasing dilution rates. Saturation constant of substrate utilization rate equation, Ks was 6.6 g PVA/. , and maximum specific substrate utilization, k was 0.175g PVA/g cell . hr
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