Inventors:
Marc M. Spratt - Kalispell MT
Geoffrey W. Harvey - White Fish MT
Thor A. Jackola - Kalispell MT
Assignee:
Waste Treatment Technologies, Inc. - Kalispell MT
International Classification:
C02F 330
Abstract:
A method of treating sewage is disclosed that is particularly suitable for one or a small group of residential dwellings in environmentally sensitive areas. The raw sewage is flowed first into an aerobic first cell where it is aerated and forced into a highly aerobic condition where aerobic bacteria grow and consume phosphorus in a vigorous life cycle and then die. Substantial primary unloading of B. O. D. , T. S. S. , coliform, and phosphorous is accomplished in this first cell. The fluid from the first cell overflows into a second cell where additional sedimentary clarification occurs and it goes anaerobic. A third cell has an upwelling flow through a porous medium substrate where anaerobic bacteria converts nitrogen in nitrates and nitrites to nitrogen gas, and the fluid then flows into a fourth holding cell. The effluent in the holding cell can then be flowed intermittently through a sand filter that has a bed of dolemite for final removal of residual phosphorus before it flows into a drain field. Alum and methanol can be added to the raw sewage to, respectively, enhance initial flocculation and sedimentation in the first cell and to support anaerobic bacteria in the third cell.
