透過性支持体を用いた回転円板法による下廃水処理の特性

抄録

Generally, an impermeable plate has been used as the substratum of rotating biological contractors (RBC). In this study, ‘wire nets’ are used for the permeable substratum of RBCs. As a result, the following findings were elucidated : (1) The substrate removal rate of the permeable substrata is higher than that of the impermeable ones due to bio-mass existing in the space of the substratum and the increase of bio-film thickness. (2) The stable treatment performances are attained in case of short- and long-term change of loading. (3) After detaching bio-film from the substratum, the substrate removal rate of the permeable substratum is not decreased by reactivating of the remained bio-film. Concluding from the above results, when permeable substratum is used in RBCs and any detachment is occurred on the bio-film, the detachment face retrieves a new bio-film surface. Dominant microorganisms in the deep bio-film can be activated. Then it is predicted that the substrate removal rate increases more than the one in the impermeable substratum.