Membrane system to treat leachate and methods of treating leachate
Embodiments of the present disclosure provide for systems for removing contaminants from a leachate, methods of removing contaminants from a leachate, and the like.
1 . A recursive concentrate reduction membrane system, comprising:
a first stage series of membrane vessels in fluidic communication, where each membrane vessel is connected in series with one another, wherein each of the membrane vessels are independently selected from the group consisting of: a reverse osmosis membrane and a nanofiltration membrane, wherein the first membrane vessel in the first stage series is configured to separate a leachate into a permeate and a concentrate, wherein the recursive concentrate reduction membrane system is configured to direct the concentrate from one vessel to the following vessel in the series, wherein each subsequent membrane vessel is configured to separate the concentrate from the previous vessel into a concentrate and a permeate, wherein the permeate from the subsequent vessels is of lower quality in terms of higher total dissolved solids and other monovalent ions concentration than the previous vessel, wherein at least some of the concentrate from the end of the first stage series is directly discharged or recirculated back to the location of the untreated leachate for additional treatment; and
a second stage series of membrane vessels in fluidic communication, wherein the permeate from the end of the first stage series is sent to the second stage series of membrane vessels.
2 . The recursive concentrate reduction membrane system of claim 1 , wherein the membrane vessels are configured to frequently monitor the treated permeate quality from each membrane vessel and routed either to discharge the permeate from the system or to be returned to either a holding tank or the location where the untreated leachate is stored, depending on the treated leachate quality.
3 . The recursive concentrate reduction membrane system of claim 1 , further comprising a filter upstream of the first membrane vessel to prefilter the leachate prior to introduction to the membranes.
4 . The recursive concentrate reduction membrane system of claim 1 , wherein the system is configured to introduce the permeate from subsequent membrane vessels to the leachate while the system is configured to dispose of or recirculate a final stage concentrate.
5 . The recursive concentrate reduction membrane system of claim 1 , wherein the first stage series of membrane vessels, or the second stage series of membrane vessels, are configured to treat the partially treated permeate again either blended with untreated leachate or as a distinct stream.
6 . The recursive concentrate reduction membrane system of claim 1 , further comprising a system to adjust the pH of the leachate prior to introduction to the membranes.
7 . The recursive concentrate reduction membrane system of claim 5 , wherein the pH of permeate is adjusted before introducing to the first membrane vessel.