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Preparation of crosslinked macroporous PVA foam carrier for immobilization of microorganisms

Paper ID Volume ID Publish Year Pages File Format Full-Text
35210 45081 2010 7 PDF Available
Title
Preparation of crosslinked macroporous PVA foam carrier for immobilization of microorganisms
Abstract

In this work, a new and economical way to prepare macroporous poly(vinyl alcohol) (PVA) foam was explored by adding calcium carbonate as a pore-forming agent and using epichlorhydrin as a chemical crosslinking agent to improve foam stability. The mixture for foam formation has been optimized to obtain macroporous PVA foam carriers with uniform apertures, narrow distribution of pore sizes, and good elasticity. The crosslinked PVA foam (CPVAF) carrier demonstrated better chemical and thermal stability, as well as larger specific surface area and diffusion coefficients than the traditional PVA (TPVA) carrier. Nitrifying bacteria were used to test the suitability of CPVAF and TPVA carriers for immobilized microorganisms. CPVAF carriers supported higher biomass density and microbial activity than TPVA carriers. At the same biomass density, the higher nitrification rate of CPVAF carriers was attributed to excellent mass transfer of the substrate (and oxygen) between the bulk solution and the immobilized microorganisms.

Keywords
Poly(vinyl alcohol); Macroporous carrier; Crosslink; Adsorption; Immobilized microorganism; Nitrifying bacteria
First Page Preview
Preparation of crosslinked macroporous PVA foam carrier for immobilization of microorganisms
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 1, January 2010, Pages 60–66
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering