Water treatment control system using fluorescence analyzer

• US 20040045880A1
• Filed: 08/14/2003
• Published: 03/11/2004
• Est. Priority Date: 11/30/2000
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kaneko, Masao, Tamaki, Shojiro, Murayama, Seiichi, Kurokawa, Futoshi, Taguchi, Kenji, Hayashi, Takumi, Kubo, Kie, Hiramoto, Akira, Iyasu, Kotaro, Kaiga, Nobuyoshi
• Granted Patent: US 7,014,752 B2
• Time in Patent Office: Days
• US Class Current: 210/96.1
• CPC Class Codes: B01D 2311/04 Specific process operations in the feed stream; Feed pretreatment
• CPC Class Codes: B01D 2311/16 Flow or flux control
• CPC Class Codes: B01D 61/145 Ultrafiltration
• CPC Class Codes: B01D 61/147 Microfiltration
• CPC Class Codes: B01D 61/16 Feed pretreatment
• CPC Class Codes: B01D 61/22 Controlling or regulating
• CPC Class Codes: C02F 1/008 Control or steering systems not provided for elsewhere in subclass C02F
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/44 by dialysis, osmosis or reverse osmosis general membrane separation processes B01D61/00, membrane modules B01D63/00, electrodialysis C02F1/4693, combination of membrane modules and bioreactors C02F3/1268
• CPC Class Codes: C02F 1/444 by ultrafiltration or microfiltration
• CPC Class Codes: C02F 1/52 by flocculation or precipitation of suspended impurities C02F1/463 takes precedence
• CPC Class Codes: C02F 1/76 with halogens or compounds of halogens C02F1/4674 takes precedence
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2209/001 Upstream control, i.e. monitoring for predictive control
• CPC Class Codes: C02F 2209/003 Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: Y10S 210/908 Organic

Abstract

A water treatment control system using a fluorescence analyzer includes an activated carbon injection equipment 4 having an activated carbon injector 4a, a fluorescence analyzer 7 provided on the upstream of the activated carbon injector 4a, and a flowing water flowmeter 6. An activated carbon injection rate necessary to reduce a trihalomethane formation potential is calculated by an activated carbon injection rate calculating apparatus 8 based on a measured value from the fluorescence analyzer 7. An activated carbon injection amount from the activated carbon injector 4a is controlled by an activated carbon injection amount control apparatus 9 based on the activated carbon injection rate and a measured value from the flowing water flowmeter 6.

Claims

1. A water treatment control system using a fluorescence analyzer comprising:

an injection mechanism for injecting an impregnating agent to a water to be treated;

a fluorescence analyzer for measuring a relative fluorescence intensity of the water to be treated;

a flowing water flowmeter for measuring a flow rate of the water to be treated; and

a control apparatus for calculating an impregnating agent injection rate necessary to reduce a trihalomethane formation potential based on a measured value from the fluorescence analyzer to control the injection mechanism based on the impregnating agent injection rate and the flow rate from the flowing water flowmeter.

2. The water treatment control system using a fluorescence analyzer according to claim 1,

wherein the injection mechanism includes an activated carbon injector for injecting an activated carbon to the water to be treated, and

wherein the control apparatus includes an activated carbon injection rate calculating apparatus for calculating an activated carbon injection rate necessary to reduce the trihalomethane formation potential based on the measured value from the fluorescence analyzer, and an activated carbon injection amount control apparatus for controlling an activated carbon injection amount from the activated carbon injector based on the flow rate from the flowing water flowmeter and the activated carbon injection rate calculated by the activated carbon injection rate calculating apparatus.

3. The water treatment control system using a fluorescence analyzer according to claim 2,

wherein the fluorescence analyzer consists of a pair of analyzers provided on both upstream side and downstream side of the activated carbon injector, and the activated carbon injection rate calculating apparatus calculates the activated carbon injection rate based on measured values from the pair of analyzers.

4. The water treatment control system using a fluorescence analyzer according to claim 1,

wherein the injection mechanism includes a plurality of chlorine agent injectors for injecting a chlorine agent to the water to be treated, and

wherein the control apparatus includes a chlorine agent injection equipment calculation apparatus for selecting an optimum chlorine agent injector to constrain the trihalomethane formation potential based on the measured value of the fluorescence analyzer, and for calculating a chlorine agent injection rate, and a chlorine agent injection amount control apparatus for controlling a chlorine agent injection amount from the chlorine agent injector based on the flow rate from the flowing water flowmeter and the chlorine agent injection rate calculated by the chlorine agent injection equipment calculation apparatus.

5. The water treatment control system using a fluorescence analyzer according to claim 4,

wherein the fluorescence analyzer is provided on the upstream side of the chlorine agent injectors.

6. The water treatment control system using a fluorescence analyzer according to claim 1,

wherein the injection mechanism includes an ozone treatment equipment having a plurality of ozone tanks arranged serially, each of which has an ozone injector for injecting an ozone to the water to be treated, and

wherein the control apparatus includes an ozone injection rate calculating apparatus for calculating an ozone injection rate to the respective ozone tanks necessary to reduce the trihalomethane formation potential based on a measured value of a control fluorescence analyzer, and an ozone injection amount control apparatus for controlling an ozone injection amount from the ozone injectors based on the flow rate from the flowing water flowmeter and the ozone injection rate calculated by the ozone injection rate calculating apparatus.

7. The water treatment control system using a fluorescence analyzer according to claim 6,

wherein the fluorescence analyzer is provided in at least one of the ozone tanks.

8. The water treatment control system using a fluorescence analyzer according to claim 1,

wherein the injection mechanism includes a coagulant injector for injecting a coagulant to the water to be treated, and

wherein the control apparatus includes a coagulant injection rate calculating apparatus for calculating an optimum coagulant injection rate necessary to reduce the trihalomethane formation potential based on the measured value of the fluorescence analyzer, and a coagulant injection amount control apparatus for controlling a coagulant injection amount from the coagulant injector based on the flow rate from the flowing water flowmeter and the coagulant injection rate calculated by the coagulant injection rate calculating apparatus.

9. The water treatment control system using a fluorescence analyzer according to claim 8,

wherein the fluorescence analyzer consists of a pair of analyzers provided on both upstream side and downstream side of the coagulant injector, and the coagulant injection rate calculating apparatus calculates the coagulant injection rate based on measured values from the pair of analyzers.

10. A water treatment control system using a fluorescence analyzer comprising:

a membrane filtration apparatus for separating and removing a turbid substance in a water to be treated;

a fluorescence analyzer for measuring a relative fluorescence intensity of the water to be treated; and

a membrane filtration operation control apparatus for operating and controlling the membrane filtration apparatus based on the measured value of the fluorescence analyzer.

11. The water treatment control system using a fluorescence analyzer according to claim 10,

wherein the fluorescence analyzer consists of a pair of analyzers provided on both upstream side and downstream side of the membrane filtration apparatus, and the membrane filtration operation control apparatus operates and controls the membrane filtration apparatus based on the measured values from the pair of analyzers.