REGENERATION OF USED DISHWASHING WATER WITHOUT CHEMICAL ADDITIVES FOR SANITIZING AND SPOT-FREE RINSE USES

摘要

An improved dishwashing system includes operating methods and apparatus for water and energy conservation and elimination of spot-reducing chemicals in the rinse water. return water from the rinse cycle is stored in insulated tanks and rinse water flowing to the dishwasher absorbs heat from the return water to thereby conserve the heat energy of the return water while simultaneously cooling the return water to a selected temperature in preparing a feed solution for membrane separation. A controlled quantity of make-up water is added to the feed solution which is raised to a selected pressure to provide for reverse osmosis purification and deionization. The reverse osmosis effluent is accumulated and, when needed, boosted in pressure to a desired operational dishwasher pressure, and heated to sanitizing level so as to achieve desired bacterial count levels during rinse cycles. Rinsing with the purified and deionized water results in filmfree and spot-free dishes after drying.