| 摘要 |
An apparatus to filter and assist the aerobic biological treatment, in stages, of liquid waste effluent such as sewage and other household degradable wastes. A hollow body is enclosed other than for a waste inlet and a filtrate outlet. The inlet discharges onto solids entrapment means mounted on a drain plate in an aerated void within the body. The trapped solids are seeded with a quantity of organisms such as worms and beetles to create a biomass which acts to break down the trapped solids. A diffuser is provided to receive the permeation from the entrapment means. The diffuser is aerated and provides a substantial surface area over which the permeation flows. Permeation settling on the diffuser forms a slime which continues the breaking down action of the biomass. Permeation from the diffuser is preferably transferred to a reservoir adapted to be pressured and air pumping means are directed thereinto. The filtrate outlet conduit has an intake controlled by a float valve in an upper part of the reservoir. A recycle conduit has an intake in a lower part of the reservoir and discharges onto the entrapment means. Control means are provided for the periodic pressurisation of the reservoir to recycle some of the permeation in the reservoir. Also, if the quantity of permeation is such as to open the outlet valve to expel some of the permeation from the filtrate outlet. Secondary filters and a second reservoir can be provided between the first reservoir and the filtrate outlet. The second reservoir operates substantially the same as the first reservoir, the recycle conduit thereof discharging onto the outlet filters. |
