System for continuous oil/water separation using superhydrophilic oil/water separation filter
A continuous oil-water separation system includes a storage tank having an inlet and an outlet and storing an oil-water mixture, a filter housing including a storage space having a predetermined height and having an inlet connected to the outflow portion of the storage tank to allow the oil-water mixture to flow in therethrough, a water drain hole allowing water separated from the oil-water mixture to be discharged therethrough, and an outlet allowing a residual oil-water mixture to flow out therethrough, a super-hydrophilic oil-water separation filter positioned in the storage space of the filter housing to absorb water from the oil-water mixture and connected to the water drain hole to allow the absorbed water to be discharged therethrough, a pressure control valve installed on an outlet pipe extending from the outlet, and a hydrophobic membrane connected to a rear end of the pressure control valve on the outlet pipe.
1 . A continuous oil-water separation system comprising:
a storage tank having an inflow portion and an outflow portion and storing an oil-water mixture;
a filter housing including a storage space having a predetermined height and including an inlet connected to the outflow portion of the storage tank to allow the oil-water mixture to flow in therethrough, a water drain hole allowing water separated from the oil-water mixture to be discharged therethrough, and an outlet allowing a residual oil-water mixture to flow out therethrough;
a super-hydrophilic oil-water separation filter positioned in the storage space of the filter housing to absorb water from the oil-water mixture and connected to the water drain hole to allow the absorbed water to be discharged therethrough;
a pressure control valve installed on an outlet pipe extending from the outlet; and
a super-hydrophobic membrane connected to a rear end of the pressure control valve on the outlet pipe,
wherein the super-hydrophilic oil-water separation filter includes polymer base fibers and a thermosetting coating layer and a hydrogel layer formed on surfaces of the fibers,
wherein the thermosetting coating layer includes polyimide (PI) or polyamic acid (PAA) having carboxyl groups (—COO—) on a surface thereof, wherein the hydrogel layer includes polyacrylamide (PAM) crosslinked by a crosslinking agent including bisacrylamide (BIS), and wherein the hydrogel layer is chemically bonded to the thermosetting coating layer via amide bonds (—CONH—) formed between the carboxyl groups and acrylamide monomers,
wherein the filter has a structure in which the polymer base fibers are stacked in multiple layers to form a cylindrical shape,
wherein the filter has super-hydrophilicity having a contact angle with water in the air of 10° or less.
2 . The continuous oil-water separation system of claim 1 , wherein
the inlet is fluidly connected to a lower end of the storage space of the filter housing,
the outlet is fluidly connected to an upper end of the storage space of the filter housing, and
the water drain hole is fluidly connected to a lower end of the super-hydrophilic oil-water separation filter.
3 . The continuous oil-water separation system of claim 1 , wherein
the super-hydrophilic oil-water separation filter is provided in a central portion of the filter housing in a columnar shape extending in a height direction of the filter housing.
4 . The continuous oil-water separation system of claim 1 , wherein
the polymer base fibers includes one or more selected from the group consisting of
polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE).
5 . The continuous oil-water separation system of claim 1 , wherein
each of the polymer base fibers has a diameter of 10 to 50 micrometers.
6 . A continuous oil-water separation system comprising:
a storage tank having an inflow portion and an outflow portion and storing an oil-water mixture;
a first filter housing having a storage space having a predetermined height and including a first inlet connected to the outflow portion of the storage tank to allow the oil-water mixture to flow in therethrough, a water drain hole allowing water separated from the oil-water mixture to be discharged therethrough, and a first outlet allowing a residual oil-water mixture to flow out therethrough;
a super-hydrophilic oil-water separation filter positioned in the storage space of the first filter housing to absorb water from the oil-water mixture and connected to the water drain hole to allow the absorbed water to be discharged therethrough;
a first pressure control valve connected to the first outlet to control opening and closing of the first outlet;
a second filter housing including a storage space having a predetermined height and having a second inlet connected to the first outlet of the first filter housing to allow the oil-water mixture to flow in therethrough, an oil drain hole allowing oil separated from the oil-water mixture to be discharged therethrough, and a second outlet allowing a residual oil-water mixture to be discharged therethrough;
a super-hydrophobic oil-water separation filter positioned within the storage space of the second filter housing to absorb oil from the oil-water mixture, and connected to the oil drain hole to discharge the absorbed oil;
a second pressure control valve installed on an outlet pipe extending from the second outlet; and
a super-hydrophilic membrane connected to a rear end of the second pressure control valve on the outlet pipe,
wherein the super-hydrophilic oil-water separation filter includes polymer base fibers and a thermosetting coating layer and a hydrogel layer formed on surfaces of the fibers,
wherein the thermosetting coating layer includes polyimide (PI) or polyamic acid (PAA) having carboxyl groups (—COO—) on a surface thereof, wherein the hydrogel layer includes polyacrylamide (PAM) crosslinked by a crosslinking agent including bisacrylamide (BIS), and wherein the hydrogel layer is chemically bonded to the thermosetting coating layer via amide bonds (—CONH—) formed between the carboxyl groups and acrylamide monomers,
wherein the filter has a structure in which the polymer base fibers are stacked in multiple layers to form a cylindrical shape,
wherein the filter has super-hydrophilicity having a contact angle with water in the air of 10° or less.
7 . The continuous oil-water separation system of claim 6 , wherein
the first inlet is fluidly connected to a lower end of the storage space of the first filter housing,
the first outlet is fluidly connected to an upper end of the storage space of the first filter housing, and
the water drain hole is fluidly connected to a lower end of the super-hydrophilic oil-water separation filter.
8 . The continuous oil-water separation system of claim 6 , wherein
the second inlet is fluidly connected to an upper end of the storage space of the second filter housing,
the second outlet is fluidly connected to a lower end of the storage space of the second filter housing, and
the oil drain hole is fluidly connected to an upper end of the super-hydrophobic oil-water separation filter.
9 . The continuous oil-water separation system of claim 6 , wherein
the super-hydrophilic oil-water separation filter is provided in a central portion of the first filter housing in a columnar shape extending in a height direction of the first filter housing.
10 . The continuous oil-water separation system of claim 6 , wherein
the super-hydrophobic oil-water separation filter is provided in a central portion of the second filter housing in a columnar shape extending in a height direction of the second filter housing.
11 . The continuous oil-water separation system of claim 6 , wherein
the polymer base fibers includes one or more selected from the group consisting of
polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE).
12 . The continuous oil-water separation system of claim 6 , wherein
each of the polymer base fibers has a diameter of 10 to 50 micrometers.