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- Kuraray - Model PVA - Gel Bioreactor
Kuraray - Model PVA -Gel Bioreactor
FromKuraray Group
Excellent fluidity in water requiring minimal energy for mixing. PVA gel has a network of minute pores about 20 microns in diameter tunneling throughout each bead.
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BOD removal
nitrogen removal
wastewater treatment
activated sludge
tunnelling
biodegradation
bioreactor
biomass treatment
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- Effective bacteria can be enriched in large numbers in the protective core of the beads, thus
greatly reducing sloughing of biomass - while maintaining stable treatment efficiencies.
Good oxygen permeability can support a high loading.
Therefore even with a low filling ratio PVA gel has high treatment power.
【Load】
Up to 50 kg・BOD/㎥・gel・d (BOD removal)
6 kg・N/㎥・gel・d (nitrogen removal)
- Effective bacteria can be enriched in large numbers in the protective core of the beads, thus
- Treatment with PVA gel yields less excess sludge as compared to conventional biological methods.
- PVA gel has a very high water content due to its extensive porosity, thus allowing for favorable permeability of oxygen and nutrients to the bacteria colonized inside the beads.
- Polymerized PVA gel is essentially insoluble in water and is not know to be biodegradable.
- Depending on the characteristics of the wastewater, treatment ability using PVA gel can be enhanced up to 5 times over that of conventional activated sludge, thus allowing for upgrading of existing overloaded systems or for design of new process units with greatly reduced foot prints.
- Material : PVA (Polyvinyl alcohol)
- 4 mm spherical beads having a specific gravity of 1.025.
- One PVA-gel bead can hold up to 1 billion microorganisms. *(* depending on operating conditions)
- Fluorescence in situ hybridization (FISH) method
- Bacteria multiply toward the core of PVA-gel beads.