Wastewater overflow systems and methods

Patent metadata

Field	Value
Publication number	US-10106446-B2
Application number	US-201314437365-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Oct 22, 2012
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

Systems and methods for treating a wastewater are provided. The wastewater treatment system and methods allows for effective treatment of wastewater during conditions that may cause increased wastewater flow to the system.

First claim

The invention claimed is:

1. A method of treating wastewater comprising:
introducing a first wastewater stream to a first bioreactor to provide a first mixed liquor;
introducing a second wastewater stream to a second bioreactor to provide a second mixed liquor, the first bioreactor and the second bioreactor arranged in parallel;
separating the first mixed liquor in a first clarifier to provide a first treated effluent and a first activated sludge;
separating the second mixed liquor in a second clarifier to provide a second treated effluent and a second activated sludge, the first clarifier and the second clarifier arranged in parallel;
introducing a ballast to at least one of the second activated sludge and the second bioreactor to provide a ballasted activated sludge, wherein introducing the ballast comprises mixing the ballast and the second activated sludge in a mixing tank; and
introducing a portion of the ballasted activated sludge to a ballast recovery subsystem responsive to a termination of a high flow event, prior to mixing the ballast and the second activated sludge in the mixing tank, to provide a recovered ballast and a waste sludge.

2. The method of claim 1 , further comprising storing the recovered ballast in a slurry tank.

3. The method of claim 2 , further comprising introducing the recovered ballast from the slurry tank to the mixing tank.

4. The method of claim 1 , further comprising introducing a portion of the first activated sludge to at least one of the first bioreactor, the second bioreactor, and the mixing tank.

5. The method of claim 4 , further comprising introducing a portion of the second activated sludge to at least one of the first bioreactor and the second bioreactor.

6. The method of claim 1 , further comprising introducing a polymer downstream of the second bioreactor and upstream of the second clarifier.

7. The method of claim 6 , further comprising introducing a polymer downstream of the first bioreactor and upstream of the first clarifier.

8. The method of claim 1 , further comprising adding at least one of fresh and recovered ballast to the mixing tank.

9. The method of claim 1 , wherein the ballast is magnetite.

10. The method of claim 1 , wherein a total flow of the first wastewater stream and the second wastewater stream is about 1,500 gallons per day per square foot of a surface area of clarifier to about 5,000 gallons per day per square foot of the surface area of clarifier.

11. The method of claim 1 , wherein the second wastewater stream is introduced to the second bioreactor responsive to a high flow event.

Assignees

• Evoqua Water Tech Llc

Inventors

• Bishop Andrew G
• Woodard Steven E
• Rodrigues Paul M

Classifications

• C02F2101/10

  Inorganic compounds · CPC title

• C02F2103/001

  Runoff or storm water · CPC title

• Y02W10/15

  Cross-Sectional Technologies · mapped topic

• C02F2101/16

  Nitrogen compounds, e.g. ammonia · CPC title

• C02F3/12 Primary

  Activated sludge processes · CPC title