Standard Oil Company (Indiana)

Joe D Walk

James F Grutsch

Russell C Mallatt

Disclosed is a process for the treatment of water so as to produce water of high purity, such as potable water. The process also entails the treatment of water which may have received prior water treatment, and comprises adding an effective amount of chemical flocculant to the feed water and subjecting said water to flocculation; passing the flocculated water to a clarifier where suspended solids are separated from the partially purified water; adding about 1 to about 100 parts powdered activated carbon per million parts of water from the clarifier; contacting the water with said carbon in a reaction zone so as to achieve substantial reduction of contaminants in the water; separating the activated carbon from the purified water; and recycling a portion of the separated activated carbon to the clarifier effluent.

Process for the purification of water

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.

Waste water process for treatment of strong wastes

Disclosed is an improved process for the treatment and purification of waste water. Generally the process comprises the use of primary, intermediate, and secondary treatment but tertiary treatment may also be included. Powdered activated carbon is used in the secondary treatment with recycle to any or all of the primary, intermediate or secondary treatment stages. Regeneration of used powdered activated carbon is also provided. In some cases, the improved process for the purification of waste water comprises feeding the waste water to a first clarification zone wherein easily removable solids are separated from the water; passing the effluent from the first clarification zone to a filtration or air flotation zone wherein suspended solids and colloidal matter are separated from the water; passing the effluent from the filtration or air flotation zone to an aeration zone wherein the water is contacted with activated sludge and powdered activated carbon, and oxygen is introduced into the water-sludge-carbon mixture; passing the effluent from the aeration zone to a second clarification zone wherein purified water is separated from the sludge and carbon; recycling a first portion of the separated sludge and carbon from the second clarification zone to the filtration zone effluent; recycling a second part of the separated sludge and carbon from the second clarification zone to the first clarification zone effluent; and passing purified water from the second clarification zone.

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Homewood, IL, United States of America

Joe D Walk