Development of an Integrated System with Photoreactive Functional Polymer Gels, Denitrifying Dephosphatation and Methane Denitrification

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Biomass immobilization technique has been put to practical use in advanced waste water treatment processes. The conventional immobilization technique, however, poses a problem with respect to mass transfer resistances for substrate and product molecules to the microorganisms inside immobilization gel matrices. The problem can be solved by utilization of functional gels as an immobilizing medium, which reversibly shrink and swell when external conditions change such as temperature, pH, solvent composition and so on. In this study, visible light-stimulus-response NIPA-CH(N-isopropylacrylamide-Chlorophyllin) gels were applied to examine a possibility of the utilization in waste water treatment processes. The purpose of this study was to investigate physical properties of the NIPA-CH gels such as swelling ratios, repetitive behaviour, and the influence of the immobilized microorganisms upon the swelling capacities. The NIPA-CH gels showed sufficient swelling ratios under cyclic visible light stimuli, and it was suggested that the mass transfer of substrates would be enhanced by the shrinking and swelling effects of the visible light-stimulus-response NIPA-CH gels.