Wastewater treatment method comprising decantation and fine screening stages
First Claim
1. A method for removing helminth egg and other suspended solids from a wastewater stream, the method comprising:
- directing the wastewater to a ballasted flocculation system and adding a ballast, a coagulation agent and a flocculation agent into the wastewater to form sludge in the wastewater;
settling the sludge in the wastewater in a settling tank at a rate of at least 10 meters per hour and producing an effluent; and
removing helminth egg from the effluent by filtering the effluent through a fine screen having a mesh diameter of approximately 8 micrometers to approximately 12 micrometers, such that the filtered effluent has less than 1 helminth egg per liter.
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Abstract
A method for removing helminth egg and other suspended solids from a wastewater stream includes directing the wastewater to a ballasted flocculation system and adding a coagulation agent, flocculation agent and a ballast into the wastewater. Sludge is settled from the wastewater in a settling tank at a rate of at least 10 meters per hour. The method further includes removing helminth egg by filtering the effluent through a fine screen having a mesh diameter of approximately 5 micrometers to approximately 25 micrometers. After passing through the fine screen, the filtered effluent has less than one helminth egg per liter.
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Citations
8 Claims
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1. A method for removing helminth egg and other suspended solids from a wastewater stream, the method comprising:
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directing the wastewater to a ballasted flocculation system and adding a ballast, a coagulation agent and a flocculation agent into the wastewater to form sludge in the wastewater; settling the sludge in the wastewater in a settling tank at a rate of at least 10 meters per hour and producing an effluent; and removing helminth egg from the effluent by filtering the effluent through a fine screen having a mesh diameter of approximately 8 micrometers to approximately 12 micrometers, such that the filtered effluent has less than 1 helminth egg per liter. - View Dependent Claims (2, 3, 4)
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5. A method of treating water having helminth egg and other suspended solids, the method comprising:
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directing water into a settling tank and settling the suspended solids in the water at a rate of at least 10 meters per hour and producing an effluent; and downstream from the settling tank, filtering the effluent through a fine screen having a mesh diameter of approximately 8 micrometers to approximately 12 micrometers. - View Dependent Claims (6, 7, 8)
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Specification