Patent ID: 11866350
Assignee: APHINITY, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 8:
9. A two-stage water treatment process for processing an incoming stream of water, comprising:
in a first stage comprising a forward osmosis or nanofiltration process, processing the incoming stream of water to remove impurities and produce an outgoing stream of water usable for potable water and a rejection stream of waste water, the first stage comprising:
introducing a dechlorination chemical into the incoming stream of water using a dechlorination pump;
subsequently passing the incoming stream of water through a membrane of a nanofiltration or forward osmosis process, thereby producing the outgoing stream of water useable for potable water and the rejection stream of waste water;
monitoring the ORP of the rejection stream of waste water with an ORP monitor, wherein the ORP monitor controls the on/off operation of the dechlorination pump,

the two-stage water treatment process further comprising, in a second stage including a weak acid cation resin, processing the waste water to remove hardness and alkalinity and produce an outgoing stream of processed water, wherein the second stage includes:
capturing some or all of the rejection stream of water in a waste storage tank holding waste water from the first stage;
storing a salt in a salt storage tank and providing a salt feed line between the salt storage tank and the waste storage tank;
pumping the waste water from the waste storage tank into a waste water feed line leading to the weak acid cation resin;
monitoring, via a pH monitor, the pH of the waste water in the waste water feed line;
controlling, via the pH monitor, the introduction of a salt into the waste storage tank to raise the alkalinity of the waste water in the waste storage tank;
processing the waste water through the weak acid cation resin to remove hardness and alkalinity from the waste water, via ion exchange, and produce the outgoing stream of processed water; and
storing the processed water in a processed water storage tank.