<p>PCT No. PCT/AU91/00587 Sec. 371 Date Jun. 18, 1993 Sec. 102(e) Date Jun. 18, 1993 PCT Filed Dec. 19, 1991 PCT Pub. No. WO92/11210 PCT Pub. Date Jul. 9, 1992.A process for treatment of biological waste includes passing biological waste liquid downwardly through at least one substantially vertically oriented curtain having a reinforcing layer of support material. Attached thereto is at least one layer of flexible reticulated open cellular material having a plurality of communicating cells which form a support for filamentous micro-organisms and/or symbionts included in the filamentous micro-organisms. The filamentous micro-organisms and/or symbionts form a dense mat of cellular material adhering to the support. The biological waste is collected after passage through the curtain for ultimate disposal.</p>
