System for providing treated water

Patent metadata

Field	Value
Publication number	US-10611650-B2
Application number	US-201916661493-A
Country	US
Kind code	B2
Filing date	Oct 23, 2019
Priority date	Aug 8, 2018
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

Abstract

A method of treating water in a water treatment system after a replacement of an ion exchange bed includes introducing water to be treated into the ion exchange bed of the water treatment system to produce treated water, calculating a current exchange daily average flow rate of water through the water treatment system, calculating a cumulative daily average flow rate of water through the water treatment system, and determining an estimated number of days remaining to exhaustion of the ion exchange bed based on the current exchange daily average flow rate and the cumulative daily average flow rate.

First claim

What is claimed is:

1. A system for providing treated water, the system comprising a first water treatment unit having:
a first ion exchange bed having ion exchange media contained therein, and disposed to receive a first water stream to be treated;
a first flow meter positioned along a flow path including the first ion exchange bed and configured to measure a first flow rate of the first water stream passing through the first flow path; and
a first controller in communication with the first flow meter, the first controller configured to:
receive first flow rate data regarding the first flow rate;
calculate, based on the first flow rate data, a first current average flow rate of the first water stream through the first ion exchange bed;
calculate a first cumulative average flow rate through the first water treatment unit;
determine a first weighted average flow rate from a weighted average of the first current average flow rate and the first cumulative average flow rate; and
determine an estimated number of days remaining to exhaustion of the ion exchange media in the first ion exchange bed based on the first weighted average flow rate and a capacity of the ion exchange media of the first ion exchange bed.

2. The system of claim 1 , further comprising a second water treatment unit disposed remotely from the first water treatment unit, the second water treatment unit having:
a second ion exchange bed having ion exchange media contained therein, and disposed to receive a second water stream to be treated;
a second flow meter positioned along a second flow path including the second ion exchange bed and configured to measure a second flow rate of the second water stream passing through the second flow path; and
a second controller in communication with the second flow meter, the second controller configured to:
receive second flow rate data regarding the second flow rate;
calculate, based on the second flow rate data, a second current average flow rate of the second water stream through the second ion exchange bed;
calculate a second cumulative average flow rate through the second water treatment unit;
determine a second weighted average flow rate from a weighted average of the second current average flow rate and the second cumulative average flow rate; and
determine a second estimated number of days remaining to exhaustion of the ion exchange media in the second ion exchange bed based on the second weighted average flow rate and a capacity of the ion exchange media of the second ion exchange bed.

3. The system of claim 2 , further comprising a central controller located at a site remote from first water treatment unit disposed to receive the estimated number of days remaining to exhaustion of the ion exchange media in the first ion exchange bed.

4. The system of claim 3 , wherein the central controller is further configured to receive the second estimated number of days remaining to exhaustion of the ion exchange media in the second ion exchange bed and determine whether to replace the ion exchange media in the first ion exchange bed and ion exchange media in the second ion exchange bed in a same service trip.

5. The system of claim 3 , wherein the central controller is configured to determine whether to replace the ion exchange media in the first ion exchange bed and the ion exchange media in the second ion exchange bed in the same service trip by weighing a cost associated with regenerating the ion exchange media of the first ion exchange bed and the ion exchange media of the second ion exchange bed against a cost associated with different service trips to each of the first and the second sites.

6. The system of claim 1 , wherein the first controller is configured to determine the first weighted average flow rate by applying a greater weighting to the first current average flow rate than a weighting applied to the first cumulative average flow rate.

7. The system of claim 6 , wherein the first controller is configured to determine the first weighted average flow rate by performing a calculation as follows:
first weighted average flow rate=A×(first cumulative average flow rate)+B×(first current average flow rate), wherein 0.5<A<0.9, 0.1<B<0.5, and A+B=1.

8. The system of claim 6 , wherein the first controller is further configured to schedule a second replacement of the ion exchange media at a second time determined from the estimated number of days remaining until the ion exchange media will be exhausted.

9. The system of claim 6 , wherein the second controller is configured to determine the second weighted average flow rate by performing a calculation as follows:
second weighted average flow rate=C×(second cumulative average flow rate)+D×(second current average flow rate), wherein 0.5<C<0.9, 0.1<D<0.5, and C+D=1.

Assignees

• Evoqua Water Tech Llc

Inventors

• Hoefferle Erich G
• Rozario Isabel
• Mildner Stephen

Classifications

• C02F2303/14

  Maintenance of water treatment installations · CPC title

• C02F1/283

  using coal, charred products, or inorganic mixtures containing them · CPC title

• C02F1/441

  by reverse osmosis · CPC title

• C02F1/4693

  electrodialysis · CPC title

• C02F1/76

  with halogens or compounds of halogens {(C02F1/4674 takes precedence)} · CPC title