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 including two or more reverse osmosis membranes in fluidic communication and connected in series, wherein the system is configured to introduce a leachate to the first stage, wherein the first stage is configured to separate the leachate into a first stage concentrate and a first stage permeate;
a second stage including two or more reverse osmosis membranes in fluidic communication and connected in series, wherein the first stage and the second stage are in fluidic communication, wherein the system is configured to introduce the first stage permeate to the second stage, wherein the second stage is configured to separate the first stage permeate into a second stage concentrate and a second stage permeate, wherein the second stage is configured to operate at about 300 psi or less pressurized;
a filter in the first stage to prefilter the leachate prior to introduction to the first stage reverse osmosis membranes;
a filter in the second stage to prefilter the first stage permeate prior to introduction of the first stage permeate to the second stage reverse osmosis membranes; and
a collection tank, wherein the collection tank is configured to store leachate from the leachate source and the second stage, wherein the system is configured so that the liquid inflow is adjusted to maintain a dilution factor within a tank stock that optimizes system performance.
2. The membrane system of claim 1 , wherein the system is configured so that first stage permeate is the only permeate outflow from the system.
3. The membrane system of claim 1 , wherein the system is configured so that the second stage concentrate is introduced to a third stage, wherein the third stage is configured to separate the second stage concentrate into a third stage concentrate and third stage permeate.
4. The membrane system of claim 3 , wherein the system is configured to introduce the blended streams of the second and third stage permeate to the leachate while the third stage concentrate is disposed of or recirculated.
5. The membrane system of claim 1 , further comprising:
a pressure exchanger in that the pressure energy is transferred from a high pressure concentrate stream from the first stage to a low pressure concentrate stream of the second stage.
6. The membrane system of claim 1 , wherein the filter in the first stage is a one-micron filter.
7. The membrane system of claim 1 , wherein the filter in the second stage is a one-micron filter.