Fluid treatment apparatus

• US 6,609,070 B1
• Filed: 11/13/2000
• Issued: 08/19/2003
• Est. Priority Date: 06/19/1998
• Status: Expired due to Fees

• Current Assignee: RODI Systems Corp.
• Original Assignee: RODI Systems Corp.
• Inventors: Lueck, Stanley R.
• Primary Examiner(s): Nghiem, Michael
• Assistant Examiner(s): VO, HIEN XUAN
• Application Number:
  US09/712,483
• Time in Patent Office: 1,009 Days
• Field of Search: 702/50, 700/2-3, 700/47, 700/9, 700/83, 700/266, 700/267, 700/271, 210/614, 210/739, 210/741-746, 210/96.1, 73/530.1, 73/616.8, 73/615.6
• US Class Current: 702/50
• CPC Class Codes: B01D 61/12 Controlling or regulating
• CPC Class Codes: G01N 33/18 Water
• CPC Class Codes: G05D 21/02 characterised by the use of electric means

Abstract

A fluid monitoring and control apparatus and method including providing a programmable and reprogrammable control unit comprising a display, user inputs, and input/output connections; placing a programmable logic controller in direct communication with the control unit, which programmable logic controller is programmable and reprogrammable through the control unit; and placing a plurality of fluid parameter sensors in direct communication with the control unit. The invention is also of a fluid control apparatus and method comprising providing a membrane and estimating salt rejection by the membrane.

Claims

1. A fluid monitoring and control system comprising:

a programmable and reprogrammable control unit comprising display means, user input means, and input/output connectors;

a programmable logic controller in direct communication with said control unit; and

a plurality of fluid parameter sensors in direct communication with said control unit.

2. The system of claim 1 wherein said control unit comprises a serial port for direct communication with said programmable logic controller.

3. The system of claim 1 wherein said control unit comprises a network connection port for direct communication with said plurality of fluid parameter sensors.

4. The system of claim 1 wherein said programmable logic controller receives no inputs other than from said control unit.

5. The system of claim 1 additionally comprising an integral housing to which said control unit and said plurality of sensors are attached and through which flows a fluid stream whose parameters are being sensed by said sensors.

6. The system of claim 1 wherein said plurality of sensors comprises a pressure sensing manifold cycling through a plurality of solenoid valves but requiring only a single input/output connection to said control unit.

7. A fluid control system comprising means for estimating salt rejection by a membrane wherein said estimating means comprises means for calculating one or more of the group consisting of recovery, differential pressure (DP), and normalized permeate flow (NPF).

8. The system of claim 7 additionally comprising means for detecting excessive changes in said salt rejection.

9. The system of claim 7 wherein said estimating means comprises means for detecting a concentration of dissolved solids in a permeate (C_P), in feed water (C_F), and in reject flow (C_R).

10. The system of claim 9 wherein said estimating means comprises means for calculating C_P/((C_F+C_R)/2).

11. A fluid monitoring and control method comprising the steps of:

providing a programmable and reprogrammable control unit comprising display means, user input means, and input/output connectors;

placing a programmable logic controller in direct communication with the control unit; and

placing a plurality of fluid parameter sensors in direct communication with the control unit.

12. The method of claim 11 wherein the providing step comprises providing a control unit comprising a serial port for direct communication with the programmable logic controller.

13. The method of claim 11 wherein the providing step comprises providing a control unit comprising a network connection port for direct communication with the plurality of fluid parameter sensors.

14. The method of claim 11 wherein placing the programmable logic controller in direct communication with the control unit excludes all inputs other than from the control unit.

15. The method of claim 11 additionally comprising providing an integral housing to which the control unit and the plurality of sensors are attached and through which flows a fluid stream whose parameters are being sensed by the sensors.

16. The method of claim 11 wherein placing the plurality of sensors comprises providing a pressure sensing manifold cycling through a plurality of solenoid valves but requiring only a single input/output connection to the control unit.

17. A fluid control method comprising the steps of providing a membrane and estimating salt rejection by the membrane wherein the estimating step comprises calculating one or more of the group consisting of recovery, differential pressure (DP), and normalized permeate flow (NPF).

18. The method of claim 17 additionally comprising detecting excessive changes in the salt rejection.

19. The method of claim 17 wherein the estimating step comprises detecting a concentration of dissolved solids in a permeate (C_P), in feed water (C_F), and in reject flow (C_R).

20. The method of claim 19 wherein the estimating step comprises calculating C_P/((C_F+C_R)/2).

21. A fluid control system comprising means for estimating salt rejection by a membrane wherein said estimating means comprises means for detecting a concentration of dissolved solids in a permeate (C_P), in feed water (C_F), and in reject flow (C_R) and wherein said estimating means comprises means for calculating C_P/((C_F+C_R)/2).

22. A fluid control method comprising the steps of providing a membrane and estimating salt rejection by the membrane wherein the estimating step comprises detecting a concentration of dissolved solids in a permeate (C_P), in feed water (C_F), and in reject flow (C_R) and wherein the estimating step comprises calculating C_P/((C_F+C_R)/2).