| 摘要 |
<p>Filter characterized in that it comprises, as bacterial support, a set of substantially continuous skeins of tapes of plastic material in a spiral arrangement around two holding members. The set of skeins of tapes is produced by loading it with a bacterial bed according to conventional techniques and arranging it, by virtue of the holding members, in a reservoir for treatment of waste water, preferably in a number of successive vertical planes. <IMAGE></p> |
