CPC C02F 3/302 (2013.01) [C02F 3/006 (2013.01); C02F 2103/005 (2013.01); C02F 2209/03 (2013.01); C02F 2301/046 (2013.01)] | 27 Claims |
1. A method for nitrification and denitrification of septic effluent comprising:
contacting a septic effluent with oxygen in a pump chamber to generate a pump chamber effluent, the pump chamber effluent having a dissolved oxygen concentration;
passing the pump chamber effluent to a nitrification zone to generate a first partly nitrated effluent and second partly nitrated effluent;
passing the first partly nitrated effluent to an anoxic zone to generate a partly nitrated anoxic effluent, the anoxic effluent having a dissolved oxygen concentration less than the dissolved oxygen concentration of the pump chamber effluent;
passing the partly nitrated anoxic effluent to a first denitrification zone wherein a portion of the nitrates in the partly nitrated anoxic effluent is converted to nitrogen gas and recycling effluent from the first denitrification zone to the pump chamber; and
passing the second partly nitrated effluent to a second denitrification zone to generate a denitrification zone effluent.
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