Water recycling system

Abstract

A closed water recycling system produces potable drinking water from total domestic waste-water, including household sewage. The system includes filtration and demineralization units. An electronic controller, which is preferably a microprocessor, monitors the operation of the system and automatically cleans the filter assembly, operates the demineralizer when the monitored variables indicate this is necessary, acts as a failsafe monitor to insure water quality, and shuts down the system in case of a malfunction. For example, the demineralizer may include acid and base regenerated resin beds in an ion-exchange system. When a monitor indicates that the beds require regeneration, acid and base regenerating solutions are supplied to the beds. The flow of regenerating solution and rinse is controlled by the electronics which sense conditions at the bed outlet. By stopping regeneration and rinse at certain points, a saving in regenerating solution and a reduction in rinse water are both effected, thus keeping the water losses from regeneration to a minimum. (It is desirable to have only a small amount of by-product water, of high salt concentration, to dispose of). Organic reduction is used in conjunction with the above process to reduce the requirement of physically removing and disposing of organic sludges and solids.