Immobilization of nitrifying bacteria in porous pellets of urethane gel for removal of ammonium nitrogen from waste-water |
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| Authors: | T Sumino H Nakamura N Mori Y Kawaguchi M Tada |
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| Institution: | (1) Research Division, Hitachi Plant Engineering and Construction Corporation, Kamihongo 537, 271 Matsudo, Chiba, Japan;(2) Japan Sewage Works Agency, Shimosasame, 335 Toda, Saitama, Japan |
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| Abstract: | Summary The effects of immobilizing materials on the activity of nitrifying bacteria and removal of ammonium nitrogen (NH4-N) from waste-water by immobilized nitrifying bacteria were investigated using six urethane prepolymers. With a urethane prepolymer containing 2.27% free isocyanate, a high activity yield of nitrifying bacteria was obtained. There was a drastic improvement over the conventional method of immobilization by acrylamide in the activity yield. Inorganic synthetic waste-water was treated at a high loading rate of 0.24 kg N·m–3·day–1. The NH4-N concentration of the effluent could be reduced to 2 mg·1–1 or less and the removal was 90%. The life of the pellets in terms of activity was at least 120 days.
Offprint requests to: T. Sumino |
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