低濃度で数種類の濾材に付着した生物膜の硝化活性

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Recently. a biological nitrification process using the attached biofilm has been tried and applied topurify the river and/or lake water where water pollution has become worse. In this study. the acti- vity of attached biofilm on the several kinds of filter media was measured and expressed using thebacterial number. Five reactors and two reactors were operated at about 20℃ and 10 ℃, respectively.The porous ceramics. glass beads or plastic media filled up the former reactors and the latters con tained the glass beads. Influent water prepared at about 1mg/1 of ammonium- nitrogen concentrationwas introduced continuously 1.2 liter per hour of flow rate.As results. the stable and exellent removal efficiency was acquired in the reactors at about 10℃ forabout month, which was not so different from the case of those at about 20℃. The occasional dis- charge of innert biofilm. however. should be carried out for the maintenance of biofilm activity andthe prevention of filter clogging. The ammonium-oxydizing bacteria were attached scatteringly on thesurface of the glass beads whose diameter was 2 mm. and their attachment density was 8.9 X 10^5cell/㎠. The nitrifying activity expressed using the volatile suspended solids became lower than that re- ported in the former literature. since the ammonium~oxydizing bacteria were not exsisting sufficientlyin the biofilm. However. the nitrifying activity was shown to be higher in the biofilm which contained more ammonium oxydizing bacteria. For ammoniun nitrogen. the maximum specific utilizationrateexpressed using with the bacterial number proved to be 5.7 X 10^-10 mgN/cell/day. which was within the range calculated from the values reported formerly.
福島工業高等専門学校の論文

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原田正光
福島工業高等専門学校建設環境工学科

低濃度で数種類の濾材に付着した生物膜の硝化活性

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