TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred System: The bedding material is containable in several removable bedding enclosure which is removable to effect harvesting of the castings. The housing comprises several floors and several spray means, each floor adapted to support several bedding enclosures. The housing is also insulated. The bedding enclosures are provided with mounting means so that an additional bedding enclosure containing worm bedding material can be mounted on top of an existing enclosure. This interrupts the application of sludge from the applicator means onto the worm containing bedding enclosure and thus stimulates the movement of worms from the lowest to the uppermost bedding enclosure. To allow the worms to travel between enclosures there transport holes on the base of the enclosures.Preferred Apparatus: The applicator means includes a pump for pumping the sludge from the settlement tank to the bedding enclosure, and a spray means for spraying the sludge onto the worm bedding material, such that the sludge being sprayed is in a liquid form with less than 5% solid material per volume. The bedding enclosure is a mesh tray which is on the support floor within the enclosure. The support floor is provided with a draining means for draining excess fluid that filters through the bedding material, it is transported to the waste water treatment plant. The waste treatment system further comprises a means for controlling at least two environmental parameters within the enclosure, these being moisture, temperature and optionally light and pH level.Preferred Worms: The worms are preferably red worms, preferably worms of the variety Eisenia fetida.Preferred Method: The method comprises an additional step of placing the bedding material into several bedding enclosures prior to the housing of the worms in the bedding material. The sludge is applied to the surfaces of the bedding material. The bedding enclosures, comprising bedding material and worm castings, are removed from the housing at most once every six months. EXAMPLE - None given.