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US 8,986,503 B2Granted
Whitewater recovery process
AssigneeKadant Inc.
InventorsPhilip Mason Kemp, Chris Spence
Life of this patent
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Abstract
Whitewater recovery processes, and associated systems and components, are generally described. Certain embodiments relate to whitewater recovery processes in which ion exchange is used to remove dissolved ions from the whitewater, which can reduce the degree to which chemical additives are used in the process. In certain embodiments, flocculation and/or filter components can be employed to aid in the removal of suspended solids from the whitewater.
Claims22
A method of treating whitewater, comprising:
- exposing a liquid input stream comprising whitewater or derived from whitewater and containing cations and suspended solids to a flocculent such that agglomerations of flocculent and suspended solids are formed;
- removing at least a portion of the agglomerations from the liquid input stream to produce a supernatant stream containing a lower quantity of suspended solids than the liquid input stream;
- filtering the supernatant stream to produce a retentate stream and a filtrate stream containing a lower quantity of suspended solids than the retentate stream;
- and
- removing at least a portion of the cations from the filtrate stream using an ion exchange medium.
2 more elements
A method of treating whitewater, comprising:
- flowing a liquid input stream comprising whitewater or derived from whitewater and containing cations through an ion exchange vessel containing an ion exchange medium;
- and
- removing at least a portion of the cations from the liquid input stream using the ion exchange medium to produce an ion exchanged effluent stream.
A method of treating whitewater, comprising:
- exposing a liquid input stream comprising whitewater or derived from whitewater and containing cations and suspended solids to a flocculent and a magnetically responsive material such that agglomerations of flocculent, magnetically responsive material, and suspended solids are formed;
- removing at least a portion of the agglomerations from the liquid input stream using a magnet to produce a supernatant stream containing less suspended solids than the liquid input stream;
- and
- removing at least a portion of the cations from the supernatant stream using an ion exchange medium.
1 more element
Dependencies are inferred from the claim text.