The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 30, 1979
Filed:
Jun. 15, 1977
Joe D Walk, Homewood, IL (US);
James F Grutsch, Hammond, IN (US);
Russell C Mallatt, Crown Point, IN (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
Disclosed is a waste water process for the treatment of strong wastes. Generally the process comprises an activated sludge process for the purification of waste water comprising: feeding the waste water to a first aeration zone wherein oxygen is introduced into the waste water, and said waste water is contacted with activated sludge; passing the effluent from the first aeration zone to a first clarification zone where the water from the first aeration zone is clarified to separate suspended sludge particles from partially decontaminated water; recycling a portion of the separated sludge from the first clarification zone to the first aeration zone and passing the partially decontaminated water from the first clarification zone to a second aeration zone; adding about 5 to about 500 ppm powdered activated carbon to the partially decontaminated water from the first clarification zone; oxygenating the partially decontaminated water containing carbon in a second aeration zone wherein oxygen or air is introduced into the partially decontaminated water; passing the effluent from the second aeration zone to a second clarification zone where the water from the second aeration zone is clarified to separate suspended sludge and carbon particles from decontaminated water; and recycling a portion of the separated sludge and carbon from the second clarification zone to the second aeration zone and passing decontaminated water out of the second clarification zone. Preferably said first aeration zone comprises a multiple stage aeration zone wherein waste water is aerated to introduce oxygen into the waste water in a first stage and the effluent from the first stage is aerated in one or more stages downstream of said first stage.