| 摘要 |
A wastewater treatment system for use with a conventional septic tank, or other small-scale wastewater treatment facility, for enhancing wastewater treatment without requiring complex control or maintenance limitations. The system incorporates a plurality of primary functions that combine to oxidize, nitrify, denitrify and remove water borne total dissolved solids prior to effluent discharge. Included is a fluidized-bed reactor containing biofilm attached to carrier particulates for use in the purification of wastewater. The fluidized-bed reactor is configured to include two distinct regions, namely a "lower" aerobic region and an "upper" anoxic region, during normal operating conditions. The lower aerobic region uses aerobic facultative bacteria to oxidize Carbonaceous Biochemical Oxygen Demand (CBOD), organic (Kjeldahl) nitrogen, and ammonia while consuming the dissolved oxygen in the water. Simultaneously, denitrification occurs in the upper anoxic region of the same bed at the same time. The creation of an additional anoxic region is maintained in the lower region of the septic tank for times when the dissolved oxygen consumption of the reactor is insufficient to maintain an anoxic state in the upper region of said reactor. This additional anoxic region assures effective denitrification under all operating conditions. Aeration of the wastewater is achieved by motivation of suction generated by the circulation pump and oxygenation is enhanced by the pump impeller prior to entering the fluidized bed.
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