Apparatus for controlling quality of treated water

• US 6,303,027 B1
• Filed: 02/25/2000
• Issued: 10/16/2001
• Est. Priority Date: 02/26/1999
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Shinohara, Tetsuya, Yuuki, Hiroshi, Nakada, Masajiro, Hatsushika, Yukio, Horie, Kazuhiro, Kunimi, Masaki, Nagamori, Yasuhiko, Tsutsumi, Masahiko, Yamanaka, Osamu, Nagaiwa, Akihiro
• Primary Examiner(s): Drodge, Joseph W.
• Application Number:
  US09/513,082
• Time in Patent Office: 599 Days
• Field of Search: 210/85, 210/87, 210/94, 210/96.1, 210/103, 210/138, 210/143, 210/614, 210/739, 210/97, 706/16, 706/21, 706/23, 706/903, 700/266, 700/271, 700/273, 700/275, 701/45, 701/50
• US Class Current: 210/143
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 2209/006 comprising a software program or a logic diagram
• CPC Class Codes: C02F 2209/008 comprising telecommunication features, e.g. modems or antennas
• CPC Class Codes: C02F 2209/02 Temperature
• CPC Class Codes: C02F 2209/08 Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
• CPC Class Codes: C02F 2209/14 NH3-N
• CPC Class Codes: C02F 2209/15 N03-N
• CPC Class Codes: C02F 2209/18 PO4-P
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 3/00 Biological treatment of water, waste water, or sewage C02F1/006 takes precedence
• CPC Class Codes: C02F 3/006 Regulation methods for biological treatment
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: G01N 33/1826 Organic contamination in water

Abstract

A treated water quality control system (10) has a sewage inflow estimating unit (1) for estimating an inflow of sewage and a process data storage unit (3) for storing process data on a sewage treatment plant (50). An estimated sewage inflow estimated by the sewage inflow estimating unit (1) and process data read from the process data storage unit (3) are given to a manipulated variable calculating unit (20). The manipulated variable calculating unit (20) calculates values of manipulated variables to be used by a process controller (6) for controlling the sewage treatment plant (50). The values of the manipulated variables calculated by the manipulated variable calculating unit (20) and the process data read from the process data storage unit (3) are given to a process condition estimating arithmetic unit (21). Data on estimated process conditions estimated by the process condition estimating arithmetic unit (21) is given to the manipulated variable calculating unit (20), and then the manipulated variable calculating unit (20) calculates values of the manipulated variables again.

Claims

1. A treated water quality control system for controlling a quality of treated water obtained by treating sewage by a sewage treatment plant, said treated water quality control system comprising:

a sewage inflow estimating unit configured to estimate an inflow of sewage;

a process data storage unit configured to store process data on the sewage treatment plant;

a process controller configured to control devices included in the sewage treatment plant;

a manipulated variable calculating unit configured to calculate manipulated variables for controlling the process controller on the basis of the inflow of sewage estimated by the sewage inflow estimating unit and the process data read from the process data storage unit; and

a process condition estimating arithmetic unit configured to predict future process conditions of the sewage treatment plant on the basis of process data read from the process data storage unit and the manipulated variables calculated by the manipulated variable calculating unit and configured to make the manipulated variable calculating unit update the calculated manipulated variables and determine optimum values of manipulated variables.

2. The treated water quality control system according to claim 1, wherein

the manipulated variable calculating unit determines optimum values of the manipulated variables by using a performance function for reducing operation cost to a minimum and making the quality of the treated water approach a desired value, and constraints to be fulfilled to satisfy water quality standards.

3. The treated water quality control system according to claim 1, wherein

the manipulated variable calculating unit calculates the manipulated variables by using a linear model representing a simplified biological reaction process.

4. The treated water quality control system according to claim 1, wherein

the process condition estimating arithmetic unit estimates the process conditions by calculation using a biological reaction model.

5. A treated water quality control system for controlling a quality of treated water obtained by treating sewage by a sewage treatment plant, said treated water quality control system comprising:

a sewage inflow estimating unit configured to estimate an inflow of sewage;

a process data storage unit configured to store process data on the sewage treatment plant;

an operation result data storage unit configured to store operation result data of past operations of the sewage treatment plant;

a process controller configured to control devices included in the sewage treatment plant;

a day condition input unit configured to input current weather conditions of a day;

an analogous operating condition data retrieving unit configured to retrieve operation result data on a past analogous operating day on the basis of the inflow of the sewage estimated by the sewage inflow estimating unit, the current weather conditions of the day input by the day condition input unit and operation result data of the past operations provided by the operation result data storage unit;

a process condition estimating arithmetic unit configured to predict future process conditions of the sewage treatment plant on the basis of the operation result data on the past analogous day provided by the analogous operating condition retrieving unit and the process data read from the process data storage unit.

6. The treated water quality control system according to claim 5 further comprising:

a display unit configured to display results of simulation, connected to the process condition estimating arithmetic unit.

7. A treated water quality control system for controlling a quality of treated water obtained by treating sewage by a sewage treatment plant, said treated water quality control system comprising:

a sewage inflow estimating unit configured to estimate an inflow of sewage;

a process data storage unit configured to store process data on the sewage treatment plant;

an operation result data storage unit configured to store operation result data of past operations of the sewage treatment plant;

a process controller configured to control devices included in the sewage treatment plant;

an operating condition specifying unit configured to specify operating conditions on an optionally set day on the basis of operation result data read from the operation result data storage unit; and

a process condition estimating arithmetic unit configured to predict future process conditions of the sewage treatment plant on the basis of the operating conditions for the set day specified by the operation data specifying unit and process data read from the process data storage unit.

8. The treated water quality control system according to claim 7 further comprising:

a display unit configured to display results of simulation, connected to the process condition estimating arithmetic unit.