Nitrification and denitrification wastewater treatment process
First Claim
1. An activated sludge wastewater treatment process for effectuating nitrification and denitrification utilizing three separate treatment zones, comprising the steps of:
- a) alternately introducing influent wastewater into first and second treatment zones;
b) alternately nitrifying and denitrifying the wastewater in the first and second treatment zones during the process such that at one time the first treatment zone performs a nitrification function while the second treatment zone performs a denitrification function and vice versa;
c) alternately directing effluent from the first and second treatment zones to a third treatment zone such that the effluent from the first and second treatment zones passes into the third treatment zone in alternating fashion;
d) alternately nitrifying and denitrifying the wastewater in the third treatment zone during the process such that at one time during the process the wastewater in the third treatment zone will be subjected to nitrification and at another time during the process the wastewater in the third treatment zone will be subjected to denitrification; and
e) directing the wastewater from the third treatment zone to a clarifier and separating activated sludge from purified wastewater and mixing at least a portion of the activated sludge with the influent wastewater that is alternately directed into the first and second treatment zones.
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Accused Products
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.
28 Citations
23 Claims
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1. An activated sludge wastewater treatment process for effectuating nitrification and denitrification utilizing three separate treatment zones, comprising the steps of:
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a) alternately introducing influent wastewater into first and second treatment zones; b) alternately nitrifying and denitrifying the wastewater in the first and second treatment zones during the process such that at one time the first treatment zone performs a nitrification function while the second treatment zone performs a denitrification function and vice versa; c) alternately directing effluent from the first and second treatment zones to a third treatment zone such that the effluent from the first and second treatment zones passes into the third treatment zone in alternating fashion; d) alternately nitrifying and denitrifying the wastewater in the third treatment zone during the process such that at one time during the process the wastewater in the third treatment zone will be subjected to nitrification and at another time during the process the wastewater in the third treatment zone will be subjected to denitrification; and e) directing the wastewater from the third treatment zone to a clarifier and separating activated sludge from purified wastewater and mixing at least a portion of the activated sludge with the influent wastewater that is alternately directed into the first and second treatment zones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An activated sludge wastewater treatment process for effectuating nitrification and denitrification utilizing three treatment basins comprising the steps of:
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a) directing wastewater influent from a supply line into a first treatment basin for a selected time period; b) switching the flow of wastewater from the first treatment basin to a second treatment basin and directing the influent wastewater from the supply line into the second treatment basin for a selected time period; c) nitrifying wastewater in one of the first and second treatment basins while denitrifying wastewater in the other treatment basin; d) directing effluent directly from either the first or second treatment basin to a third treatment basin; e) subjecting the wastewater in the third treatment basin to both nitrification and denitrification at various times during the nitrification-denitrification process to produce a purified effluent; and f) separating activated sludge from the purified effluent and mixing at least a portion thereof with the influent wastewater. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification