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US 2025/0083979 A1Published application
Membrane process for wastewater recycling and solvent recovery
AssigneeAquatech International Corporation
InventorsRavi Chidambaran, Narendra Singh Bisht, Nitin Chandan, D.V.R. Seshagiri Rao, Lalit W. Kumbhare
Life of this patent
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Abstract
Embodiments provide methods for separation of solvents from water using reverse osmosis membranes. The recovered water and/or recovered solvents may be recycled into a process or otherwise diverted for beneficial use.
Claims17
A process for removing a solvent from water, comprising:
- a. passing a feed water containing a solvent into a first reverse osmosis membrane water purification unit, and creating a first concentrated reject stream comprising the solvent and a first water permeate stream;
- b. recycling the first concentrated solvent stream into the feed stream;
- c. passing the first water permeate stream to a plurality of reverse osmosis membrane water purification units in a series, where each reverse osmosis membrane water purification unit in the series passes a water permeate stream to a successive feedwater for the next reverse osmosis membrane water purification unit in the series and passes a concentrated reject stream comprising solvent to a feed stream for the prior reverse osmosis membrane;
- d. from a final reverse osmosis membrane water purification unit in the series, passing a final water permeate stream for collection or beneficial use, and, optionally polishing through an activated carbon filter;
- and
- e. from the first reverse osmosis membrane water purification unit, purging the first concentrated reject stream.
3 more elements
A process for removing a solvent from water, comprising:
- a. pretreating a feed water containing a solvent in at least one of an ultrafiltration membrane, microfiltration membrane, or nanofiltration membrane;
- b. passing the feed water into a first reverse osmosis membrane water purification unit, and creating a first concentrated reject stream comprising the solvent and a first water permeate stream;
- c. recycling the first concentrated solvent stream into the feed stream;
- d. passing the first water permeate stream to a plurality of reverse osmosis membrane water purification units in a series, where each reverse osmosis membrane water purification unit in the series passes a water permeate stream to a successive feedwater for the next reverse osmosis membrane water purification unit in the series and passes a concentrated reject stream comprising solvent to a feed stream for the prior reverse osmosis membrane;
- e. from a final reverse osmosis membrane water purification unit in the series, passing a final water permeate stream for at least one of collection or beneficial use;
- and, optionally, passing the water stream for beneficial use through an activated carbon filter for polishing;
- f. from the first reverse osmosis membrane water purification unit, purging the first concentrated reject stream;
- g. optionally processing the purged first concentrated stream by at least one of advanced vacuum membrane distillation to further recover solvent, and optionally processing a distillate bottom from the advanced vacuum membrane distillation through agitated thin film drying for zero liquid discharge;
- h. recovering solvent from the processed first concentrated reject stream for at least one of collection or beneficial use.
6 more elements
Dependencies are inferred from the claim text.