Combination activated sludge—ballasted flocculation process
First Claim
1. A method of treating wastewater utilizing an activated sludge process and a ballasted flocculation process, comprising:
- directing a first wastewater stream to an activated sludge system having at least one reactor and a clarifier;
returning activated sludge from the clarifier to the reactor and mixing the activated sludge with the first wastewater stream to form mixed liquor, and directing the mixed liquor to the clarifier where the clarifier separates the activated sludge from clarified effluent;
directing a second wastewater stream to a mixing chamber;
directing mixed liquor or activated sludge from the activated sludge system to the mixing chamber, and mixing the mixed liquor or activated sludge with the wastewater from the second stream;
directing mixed liquor from the mixing chamber to a ballasted flocculation system having one or more mixing zones and a settling zone; and
mixing insoluble granular material with the mixed liquor passing through the ballasted flocculation system and separating sludge from clarified effluent in the settling zone.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and system for treating water or wastewater to remove both soluble BOD and suspended solids. The method entails directing first and second water or wastewater streams to a treatment system including an activated sludge system and a ballasted flocculation system. The first water or wastewater stream is directed to the activated sludge system which includes at least one reactor and a clarifier. The second water or wastewater stream is directed to a ballasted flocculation system. Mixed liquor or activated sludge is directed from the activated sludge system to a mixing chamber that is located upstream from the ballasted flocculation system. The water or wastewater of the second stream is mixed with the mixed liquor or activated sludge in the mixing chamber. The mixed liquor from the mixing chamber is directed to and through the ballasted flocculation system. In the end, the soluble BOD in the second water or wastewater stream is reduced and suspended solids in the water or wastewater are also reduced.
22 Citations
23 Claims
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1. A method of treating wastewater utilizing an activated sludge process and a ballasted flocculation process, comprising:
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directing a first wastewater stream to an activated sludge system having at least one reactor and a clarifier; returning activated sludge from the clarifier to the reactor and mixing the activated sludge with the first wastewater stream to form mixed liquor, and directing the mixed liquor to the clarifier where the clarifier separates the activated sludge from clarified effluent; directing a second wastewater stream to a mixing chamber; directing mixed liquor or activated sludge from the activated sludge system to the mixing chamber, and mixing the mixed liquor or activated sludge with the wastewater from the second stream; directing mixed liquor from the mixing chamber to a ballasted flocculation system having one or more mixing zones and a settling zone; and mixing insoluble granular material with the mixed liquor passing through the ballasted flocculation system and separating sludge from clarified effluent in the settling zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of treating wastewater comprising:
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a. directing at least a portion of the wastewater to be treated to an activated sludge system; b. mixing return activated sludge with the wastewater to form mixed liquor; c. directing at least a portion of the mixed liquor to a clarifier that forms a part of the activated sludge system and which produces a first clarified effluent; and d. directing at least a portion of the mixed liquor to a ballasted flocculation system that produces a second clarified effluent. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of utilizing a biological system and a ballasted flocculation system to treat wastewater, comprising:
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a. directing a first stream of wastewater through the biological system and biologically treating the first stream of wastewater to produce a first clarified effluent; b. directing a second stream of wastewater through a ballasted flocculation system and producing a second clarified effluent from the ballasted flocculation system; and c. utilizing sludge from the biological system to treat the second stream of water or wastewater such that the second stream of wastewater passing through the ballasted flocculation system is biologically treated. - View Dependent Claims (20, 21, 22, 23)
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Specification