Ryoko TANIGUCHI
Biodegradation of Wastewater of Synthetic Resin containing Polyvinyl Alcohol (PVA) using a UASB - DHS system
Takashi YAMAGUCHI
Refinement process wastewater was selected for biodegradation as a wastewater containing synthetic resin. This wastewater was consisted not only poly (vinyl alcohol)[PVA] which is synthetic resin but also starch. So, UASB (up-flow anaerobic sludge blanket)-DHS (down-flow hanging sponge) system was made an attempt to treatment of wastewater containing PVA.
Strategy for treatment of this wastewater consists 2steps. The first step is biodegradation of degradable substrate like starch by UASB reactor. Then, PVA remained wastewater was supplied to the DHS reactor. And the other step is biodegradation of PVA by DHS reactor.
As a result of lab scale UASB-DHS system, 1000mg-COD¡¦L-1 of wastewater containing starch and PVA was reduced to 53mg-COD¡¦L-1 with total hydraulic retention time (HRT) 18 hours. So industrial effluent standard (120mg-COD¡¦L-1) was achieved with HRT 18 hours.
Clone analysis based on 16S rRNA was done for sludge in the DHS reactor. As a result of this analysis, some PVA degrading bacteria like sphingopyxis sp. was detected. So, it is assumed these bacteria degrade PVA remained wastewater.
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