Process and a plant
AssigneeClean Teq Water Technology Pty Ltd
InventorsNikolai Zontov, Peter Voigt, Liann Goh, Volha Yahorava
Life of this patent
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Abstract
The present invention relates to a process and plant for treating feed water containing nitrate. The process includes, sorbing nitrate from the feed water onto an ion exchange resin to form a loaded resin and produce a treated water stream depleted in nitrate, regenerating the loaded resin so that the resin can be reused and produce a brine stream high in nitrate; and converting nitrate in the brine stream into molecular nitrogen gas with the assistance of a bioactive agent.
Claims24
A process of treating a feed water stream containing nitrate, the process includes the steps of:
- (i) sorbing nitrate in the feed water stream onto an ion exchange resin, which changes the ion exchange resin into a loaded ion exchange resin and produces a treated water stream depleted in nitrate;
- (ii) regenerating the loaded resin by desorbing nitrate therefrom using a regenerating stream including a salt which changes the loaded ion exchange resin into a regenerated ion exchange resin for reuse in step i), and produces a brine stream high in nitrate;
- (iii) converting nitrate in the brine stream into molecular nitrogen gas with the assistance of a bioactive agent, the nitrogen gas separates from the brine stream, and thereby forms a brine that provides a recycle stream;
- and
- (iv) adding at least part of the recycle stream to the regenerating stream.
A plant for treating feed water containing nitrate, the plant including:
- an adsorber vessel for sorbing nitrate in a feed water stream onto an ion exchange resin, which changes the ion exchange resin into a loaded ion exchange resin and produces a treated water stream depleted in nitrate;
- a regenerator vessel for regenerating the loaded resin by desorbing nitrate therefrom using a regenerating stream including a salt which changes the loaded ion exchange resin into a regenerated ion exchange resin for reuse in step i), and produces a brine stream high in nitrate;
- a converter vessel for converting nitrate in the brine stream into molecular nitrogen gas with the assistance of a bioactive agent, which separates from the brine stream, and thereby forms a brine that can provide a recycle stream;
- and
- a recycling line in which at least part of the recycle stream is directly or indirectly fed back to the regenerator stage.
Dependencies are inferred from the claim text.