NOVELTY - A waste treatment apparatus comprises a feed tank for collecting and feeding waste; a bioreactor to receive and treat the waste from the feed tank, where the bioreactor includes a first volume having a substrate for supporting organisms and through which the waste can pass; and a second volume adapted to receive and collect a first treated waste after it has passed through the first volume.    USE - For treating waste, by using the feed tank to supply the feed waste to the apparatus including the bioreactor; passing the waste through the first volume within the bioreactor, where the first volume includes the substrate for supporting microorganisms, thus to provide the first treated waste; collecting the first treated waste in the second volume within the bioreactor after it has passed through the first volume; and controlling the rates of addition of the feed waste and/or recirculation of waste within the recirculation circuit fluidly communicable with the first volume and/or the second volume, thus to provide a treatment cycle within the bioreactor where the rate and/or proportion of aerobic and/or anoxic treatment of the waste is controllable. (Claimed)    ADVANTAGE - The apparatus results in a higher quality effluent that may be reused. It provides in each treatment cycle at least one relatively low-oxygen period and/or at least one relatively high-oxygen period. By using the inventive apparatus, an operator may alter the time and relative amounts of aerobic and/or anoxic treatment to provide complete and sufficient waste treatment. The inventive apparatus provides effective nitrification/denitrification within a single apparatus. It provides for excellent reduction in biological oxygen demand, suspended solids, nitrogen, phosphate and fecal coliform. It does so in a simple, inexpensive and controllable device, without the need for complex chemical or physical treatment of the incoming waste.    DETAILED DESCRIPTION - A waste treatment apparatus comprises a feed tank (10) for collecting and feeding waste; a bioreactor (20) to receive and treat the waste from the feed tank, where the bioreactor includes a first volume (22) having a substrate for supporting organisms and through which the waste can pass; and a second volume (24) adapted to receive and collect a first treated waste after it has passed through the first volume. The flow of waste into the bioreactor is controllable within a treatment cycle to provide for and toggle the relative proportions of aerobic and anoxic treatment of the waste in the bioreactor.    DESCRIPTION OF DRAWING(S) - The figure is a front elevational view of a waste treatment apparatus.    Feed tank (10)    Bioreactor (20)    First volume (22)    Second volume (24)    Ultraviolet disinfection unit (40)