Process and system for back-and-forth washing of adsorptive media
AssigneeOzono Polaris, S.A. de C.V.
InventorDavid Ross Mackay Pett
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Abstract
The invention provides methods and systems for washing adsorptive media with minimal water consumption. More specifically, the invention provides methods and systems for in situ regeneration and/or sanitization of adsorptive media, such as activated carbon, using back-and-forth washing.
Claims20
A method for washing an adsorptive medium within a water treatment system, wherein the water treatment system comprises a first and a second vessel, the first vessel having an underdrain assembly,
- and wherein the first vessel is configured to contain at least one adsorptive medium and to perform a fluid filtration step of a fluid in a filtration flow direction and the second vessel is in fluid communication with the first vessel, wherein the fluid to be filtered comprises water;
- said method comprising the steps of:
- filtering the fluid;
- stopping the filtration step and draining the fluid from the first vessel in a draw down direction that is substantially the same as the filtration flow direction;
- and
- performing at least one washing stage with at least one wash fluid, the at least one washing stage comprising the steps of
- (a) performing a back-and-forth flow cycle comprising
- (i) drawing the at least one wash fluid from the second vessel to the first vessel in a first wash step for a duration sufficient to at least substantially fill the first vessel with the at least one wash fluid, wherein the wash fluid flows to the first vessel through the underdrain assembly and in a direction opposite to the filtration flow direction;
- and
- (iii) drawing the at least one wash fluid from the first vessel through the underdrain assembly to the second vessel in a second wash step in a direction substantially the same as the filtration flow direction;
- (b) repeating the back-and-forth flow cycle of step (a) to produce a continuous back-and-forth flow of the at least one wash fluid through the adsorptive medium, wherein the continuous back-and-forth flow comprises a plurality of back-and-forth flow cycles sufficient to at least partially regenerate the adsorptive medium, thereby producing a processed wash fluid;
- and
- (c) stopping the back-and-forth flow cycle of step (a).
A method for washing an adsorptive medium within a water treatment system, wherein the water treatment system comprises a first and a second vessel, the first vessel having an underdrain assembly,
- and wherein the first vessel is configured to contain at least one adsorptive medium and the second vessel is in fluid communication with the first vessel;
- said method comprising the steps of:
- performing at least one washing stage with at least one wash fluid, the at least one washing stage comprising the steps of
- (a) performing a back-and-forth flow cycle comprising
- (i) drawing the at least one wash fluid from the second vessel to the first vessel in a first wash step for a duration sufficient to at least substantially fill the first vessel with the at least one wash fluid, wherein the wash fluid flows to the first vessel through the underdrain assembly and in a direction opposite to the filtration flow direction;
- and
- (iii) drawing the at least one wash fluid from the first vessel through the underdrain assembly to the second vessel in a second wash step in a direction substantially the same as the filtration flow direction;
- (b) repeating the back-and-forth flow cycle of step (a) to produce a continuous back-and-forth flow of the at least one wash fluid through the adsorptive medium, wherein the continuous back-and-forth flow comprises a plurality of back-and-forth flow cycles sufficient to at least partially regenerate the adsorptive medium, thereby producing a processed wash fluid;
- and
- (c) stopping the back-and-forth flow cycle of step (a).
Dependencies are inferred from the claim text.