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US 11,767,240 B2Granted
Method for removing a contaminant from wastewater from an industrial plant and a system for performing such method
AssigneeYara International Asa
InventorsPetr Chladek, Clive M. H. Brereton, Eric Robin Mielke
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Abstract
The present application relates to a method for removing a contaminant from wastewater from industrial fertilizer plant. The method comprises the steps of concentrating the wastewater, of electrolyzing the wastewater and of recirculating the electrolyzed wastewater to the fertilizer plant. The present application further relates to a system arranged to perform the method according to the present application.
Claims8
A method for removing a contaminant from wastewater from a fertilizer plant comprising the steps of:
- a) concentrating the contaminant in the wastewater;
- b) chemically converting the contaminant in the wastewater by electrolysis;
- c) recirculating the electrolyzed wastewater to the fertilizer plant;
- and
- d) adding a salt solution to or upstream of the second compartment of the osmosis module via a salt reservoir:
- wherein the step of concentrating the wastewater is performed by a forward osmosis module or a pressure assisted osmosis module, the forward osmosis module or pressure assisted osmosis module comprising a first compartment and a second compartment separated by a membrane,
- wherein the step of concentrating the wastewater comprises the step of directing the wastewater to the first compartment of the osmosis module and wherein the recirculating step comprises the steps of
- i) directing the electrolyzed wastewater to the second compartment of the osmosis module;
- and
- ii) recirculating the wastewater from the second compartment of the osmosis module to the fertilizer plant;
- wherein the contaminant is chloride and the salt solution comprises one of ammonium nitrate and calcium nitrate.
8 more elements
Dependencies are inferred from the claim text.