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

Claim 0:
1. A two-stage water treatment process to provide potable water from a first stage and to process a resulting waste stream of water to provide makeup water, the process comprising:
in a first stage, processing the incoming stream of water to remove impurities and produce an outgoing stream of potable water and a rejection stream of waste water, wherein the first stage includes a forward osmosis (FO) or nanofiltration process, 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,
in a second stage, processing the rejection stream of waste water to remove hardness and alkalinity and produce an outgoing stream of make-up water, wherein the second stage includes:
capturing some or all of the rejection stream of waste 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 waste water from the waste storage tank into a waste water feed line leading to a weak acid cation resin;
monitoring, via a pH monitor, the pH of the waste water in the waste water feed line; and
processing waste water from the waste water feed line through the weak acid cation resin,
wherein the pH monitor controls the release of salt from the salt storage tank to the waste storage tank to raise the alkalinity of the waste water in the waste storage tank.