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

Claim 4:
5. A two stage water treatment 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 for further processing in a second stage,
in a second stage, processing the rejection stream of waste water to remove hardness and alkalinity and produce a second outgoing stream of water;
wherein the first stage comprises:
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;

wherein the second stage comprises:
capturing some or all of the rejection stream of water as waste water in a waste storage tank holding waste water from the first stage;
feeding waste water from the waste storage tank through a waste water feed line leading to a weak acid cation resin;
monitoring, via a pH monitor, the pH of the waste water flowing through 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; and
passing the waste water flowing through the waste water feed line through the weak acid cation resin to produce the second outgoing stream of water.