Immobilization of activated sludge using improved polyvinyl alcohol (PVA) gel
ZHANG Li-sheng , WU Wei-zhong , WANG Jian-long
DOI:
Received January 10, 2007,Revised May 07, 2007, Accepted , Available online
Volume 19,2007,Pages 1293-1297
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The microbial immobilization method using polyvinyl alcohol (PVA) gel as an immobilizing material was improved and used for
entrapment of activated sludge. The oxygen uptake rate (OUR) was used to characterize the biological activity of immobilized activated
sludge. Three kinds of PVA-immobilized particles of activated sludge, that is, PVA-boric acid beads, PVA-sodium nitrate beads and
PVA-orthophosphate beads were prepared, and their biological activity was compared by measuring the OUR value. The bioactivity
of both autotrophic and heterotrophic microorganisms of activated sludge was determined using di erent synthetic wastewater media
(containing 250 mg/L COD and 25 mg/L NH4
+-N). The experimental results showed that the bioactivity and stability of the three kinds
of immobilized activated sludge was greatly improved after activation. With respect of the bioactivity and the mechanical stability, the
PVA-orthophosphate method may be a promising and economical technique for microbial immobilization.
