US 5,707,514 AGranted

Water treating method and apparatus treating waste water by using ion exchange resin

AssigneeSharp Kabushiki Kaisha

InventorsKazuyuki Yamasaki, Yoshihiro Hamaguchi, Shigeki Matumoto

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Abstract

A water treating apparatus is provided which can treat waste water for use as raw water in an ultrapure water producing system without addition of various kinds of chemicals. The apparatus includes a first water tank for receiving acid waste water, a second water tank for subjecting the waste water from the first water tank to solid-liquid separation and discharging supernatant liquid, an ion exchange tank including ion exchange resin and an aeration tube for generating treated water through a membrane filter, a precipitation tank for settling ion exchange resin, an air lift pump for introducing ion exchange resin from the precipitation tank into the first water tank, and a return air lift pump for returning ion exchange resin from the second water tank to the ion exchange tank. The ion exchange resin acts to exchange ions with fluorine ions of treated water in the ion exchange tank and is regenerated by acid waste water in the first water tank.

Claims8

Dependent claims

A water treating apparatus comprising:

a first water tank for receiving alkali water or acid water;
an ion exchange tank having anion exchange resin or cation exchange resin into which anionic water or cationic water is introduced such that the anionic water or cationic water is subjected to an ion exchange treatment with the anion exchange resin or cation exchange resin for generation of treated water;
an ion exchange resin introduction means for introducing into the first water tank the anion exchange resin or cation exchange resin in the ion exchange tank;
an ion exchange resin return means for returning to the ion exchange tank the anion exchange resin or cation exchange resin regenerated by alkali water or acid water in the first water tank;
and
means for receiving alkali water or acid water from the first water tank in which the anion exchange resin or cation exchange resin has been regenerated and for introducing into the ion exchange tank water to be treated which is the alkali water or acid water having been subjected to a predetermined treatment.

3 more elements

Dependencies are inferred from the claim text.