Plunging liquid jet reactor and water treatment system

A plunging liquid jet reactor and water treatment system, comprising:

• a supply tank holding supply water, the supply tank having one or more fluid inlets and one or more fluid outlets;
• a downcomer having an upper end and an open lower end, the downcomer defining a hollow column positioned within the supply tank;
• a pump and one or more conduits for pumping supply water;
• a nozzle mounted on the upper end of the downcomer, the nozzle configured to receive pressurized supply water from the pump and configured to generate a liquid jet downward in the hollow column;
• a filter surrounding the downcomer, the filter having one or more vertical sidewalls and a base wherein at least one wall of the filter or the base is a semi-permeable membrane;
• and
• a collection tray mounted between the filter and the supply tank for collecting treated water pushed upward through an annulus between the filter and downcomer, wherein a pressure difference is created between supply water surrounding the filter and water within the filter, the pressure difference causing water molecules from the supply water surrounding the filter to pass through the semi-permeable membrane.