Nitrification and denitrification wastewater treatment process
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United States of America Patent
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Jul 16, 1996
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N/A
app pub date -
Feb 21, 1995
filing date -
Feb 21, 1995
priority date (Note) -
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Abstract
The present invention entails a nitrification-denitrification wastewater treatment process where nitrification and denitrification is carried out in three separate treatment basins. First, wastewater influent is directed from a supply line into a first basin where the wastewater is subject to denitrification. Wastewater held in a second basin is subjected to nitrification while the influent wastewater is directed into the first basin. Effluent from the first basin that is being filled is directed directly to a third basin which performs both denitrification and nitrification at various times during the total process. Purified wastewater from the third basin is directed to a clarifier which separates activated sludge from the purified wastewater and the activated sludge is returned and mixed with the influent wastewater. After a selected time period the influent wastewater being directed to the first treatment basin is switched to where the wastewater influent is now directed into the second treatment basin. Effluent from the second treatment basin is directed directly into the third treatment basin. Throughout the process, each basin is alternately switched between aerobic (Ae) and anoxic (Ao) treatment such that at various times both nitrification and denitrification can be carried out in each of the three basins.
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