Membrane treatment of water containing free oil
AssigneeEcolab USA Inc.
InventorSeong-Hoon Yoon
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Abstract
An oil-containing wastewater can be chemically treated to provide a treated wastewater that is then subject to membrane filtration. Chemical treatment of the oil-containing wastewater can reduce membrane fouling by contaminants, such as oily and colloidal contaminants, allowing a wastewater that may not otherwise be practically treated using a membrane to be treated using the membrane. The oil-containing wastewater can be pretreated with a surfactant and a high molecular weight cationic flocculant, e.g., in combination with a coagulant and an acid and/or base to adjust the pH of the wastewater to a level effective for performance of the coagulant and/or flocculant.
Claims22
A method of treating oil-containing water for membrane filtration, the method comprising:
- adding a cationic polymeric flocculant having a molecular weight of at least 1,000,000 Da and a surfactant to an oil-containing wastewater to form a treated wastewater;
- and
- supplying the treated wastewater to a membrane and generating therefrom a permeate stream and a concentrate stream.
A method of treating oil-containing water for membrane filtration, the method comprising:
- adding a cationic polymeric flocculant having a molecular weight of at least 1,000,000 Da, a coagulant, and a surfactant to an oil-containing wastewater to form a treated wastewater, wherein the oil-containing wastewater comprises wastewater from a metal milling process and/or a die casting process;
- and
- supplying the treated wastewater to a membrane and generating therefrom a permeate stream and a concentrate stream.
Dependencies are inferred from the claim text.