US 8,577,623 B2Grant
Anti-terrorism water quality monitoring system
Issue Date:2013-11-05
•19 Claims
•2 Drawing Sheets
Abstract
An Anti-Terrorism water quality monitoring system for continuously monitoring a potable water treatment system and related potable water distribution network that provides potable water to a municipality, city, housing development or other potable water consumer. The system includes the collection of data from the water distribution system and from the water treatment facility and from advanced separation processes which are integrated into analytical instruments. The data collected are stored in a remote database on a remote server computer or bank of computers and accessible by Homeland Security or its designated agency. Preferred parameters of monitoring include the turbidity and disinfectant such as chlorine, hypochlorous acid, sodium hypochlorite, calcium hypochloritc, ozone, chlorine dioxide, chloramines, hydrogen peroxide, peracetic acid.
Metadata
Assignee
- Hach Company
Inventor
- Thomas D. Wolfe
Application Information
Application Number:US 13/619,775
Filing Date:2012-09-14
Priority Date:1998-12-17
Art Unit:2857
Classifications
IPC:
G06F19/00
Patent Drawings (2 sheets)
Description
Cross-Reference to Related Applications
[0001] This application is a continuation of application Ser. No. 12/710,451 filed Feb. 23, 2010, which is a divisional of application Ser. No. 12/272,018 filed Nov. 17, 2008 (now U.S. Pat. No. 7,698,073 issued Apr. 13, 2010), which is a continuation of application Ser. No. 10/392,112 filed Mar. 19, 2003 (now U.S. Pat. No. 7,454,295 issued Nov. 18, 2008), which is a continuation-in-part of application Ser. No. 10/055,225 filed Oct. 26, 2001 (now U.S. Pat. No. 6,560,543 issued May 6, 2003), which is a continuation-in-part of application Ser. No. 09/213,781 filed Dec. 17, 1998 (now U.S. Pat. No. 6,332,110 issued Dec. 18, 2001) the contents of all of which are incorporated herein by reference in their entireties.
Field of the Invention
[0002] This invention is related to the field of water treatment, and in particular, to a method of monitoring advanced separation and/or ion exchange processes by use of the world wide web allowing review of data collected and compiled asynchronously from a web server.
Background of the Invention
[0003] Protection of water supplies from either inadvertent or deliberate contamination is an increasingly important concern. While there exist many different devices and methods to analyze water for contaminants, widespread deployment of such devices is expensive and difficult.
[0004] Most water treatment and distribution systems rely on the introduction and maintenance of a disinfectant into the water system to protect against biological and to a big extent chemical contamination. Chlorine, in the form of gas or hypochlorite, is by far the most common material used for this purpose. However, substitutes such as chloramines, ozone, hydrogen peroxide, peracetic acid, chlorine dioxide, and various mixed oxides also find service in this application. All of these materials have a more or less common mode of action. They rely on some sort of oxidation to effect the deactivation of biological organisms and the destruction of other organic compounds present in the water to be treated. The reaction rates of the various disinfection compounds are reasonably well known and well characterized.
[0005] Additionally, the presence or absence of turbidity in the water supply can greatly affect the amount of disinfectant required to achieve inactivation of biological organisms. The suspended particles producing turbidity are usually removed in the water treatment process before disinfection agents are applied. However, turbidity breakthroughs do occur and failure to quickly raise the disinfection dose level can lead to insufficient disinfection residuals reaching the distribution system. This can present a threat to public health, particularly if the drinking water supply is contaminated either deliberately or inadvertently.
[0006] To respond to the threats of terrorism in drinking water supplies, sensors have been and are being introduced into the distribution system to continuously monitor selected contaminants in the drinking water supply. For example a system may monitor free chlorine residual at a location in the distribution system downstream of the main treatment plant. However, the concentration of free chlorine present at this point in the distribution system may lag the free chlorine analyzed at the exit of the water treatment plant by hours or even days in some cases. The lag will also vary by time of day, since water demand follows well known 24 hour cyclical periods.
[0007] Applicant's invention registered as U.S. Pat. No. 6,332,110 teaches the use of a remote monitoring system to monitor the performance of an advanced separation process, particularly as related to water treatment. Many of the analytical devices used to continuously monitor water treatment operations are based on advanced separation processes employing selective ion membranes which concentrate the analyte for the detector apparatus. For example, detection of chlorine may be mediated via a membrane which readily and specifically passes free chlorine or hypochlorous acid (HOCl), thus separating the analyte from the bulk solution and concentrating it. The detector apparatus may incorporate multiple sensors and analyzers on a single unit. The multiple units are usually electronically controlled. The control system usually features output methods allowing the display and storage of collected data.
[0008] Deploying a range of sensor systems in the field provides a means to analyze for contaminants but does not provide for reporting and subsequent analysis of the data. Rapid reporting of the data to a facility readily accessible by the management or operators of the utility or distribution system and subsequent analysis of the data is very important to providing quick response in the event of a system contamination, either deliberate or otherwise.
[0009] The instant invention provides a means of rapidly aggregating the information at a central location in a form readily accessible to authorized users such as Homeland Security. It further provides a means to employ sophisticated statistical and data analysis techniques to the collected data. Since the central data collection server is connected to the internet, dispersion of alarms and alerts is greatly facilitated.
[0010] This invention consists of a method for collecting analytical data from the electronic control system of a single analyzer unit or multiple analyte units, storing the raw data locally for a short period of time, and subsequently using any of a variety of transmission means to send this data to a remote internet server computer. At the remote internet server computer, the data is stored in a database and may also be displayed via a web server. Upon arrival, or upon scheduled intervals, or upon a user request, the data is analyzed, compared to historical records, and a performance analysis result is made. Based upon the raw data or upon the analysis result, reports can be issued to appropriate regulatory agencies, alerts or alarms can be raised, and notifications issued via email, pager, voice or text messaging, or other messaging medium which can be mediated by a computer program connected to a phone line or the internet.
[0011] The methods used for data analysis can be readily varied or modified by someone skilled in the art of computer programming since the raw data is easily available from the database for manipulation. For example, the analytical data, when combined with known system constants such as flow rates, residence times, and so on, can be used to continuously generate a calculated product of disinfectant concentration times contact time C*T. This simple factor alone is quite useful in predicting the amount of biological organism deactivation. More sophisticated analyses can also be utilized. The results can be conveniently stored in the database and displayed as virtual sensors.
[0012] This invention is particularly useful when the same remote server computer has access to data from both the treatment facility and to analytical data from within the distribution system. In this case, historical information can be used to predict the expected conditions within the distribution system based on the effluent conditions from the treatment plant. The expected conditions can then be compared to the actual conditions in the distribution system. For example, in the instant invention, assume that data is being collected at the water treatment plant from the electronic control system about water flow rates, chemical dosing rates, filtered water turbidity, and chlorine residual. Also assume that data is also being collected from sensors in the distribution system reporting chlorine residual among other data. With current data and with historical data as a reference point, one can calculate a chlorine demand from the chemical dose rates, flows, and residual. Chlorine Demand is the actual amount of chlorine which is reacting, typically calculated as free chlorine dosed less the residual. Chlorine demand can be correlated with temperature, season, and filtered water turbidity. Additionally residual chlorine leaving the plant can be correlated with residual chlorine within the distribution system. If the actual chlorine residual measured at the distribution system point of measurement varies from the historical values expected from the chlorine residual leaving the treatment facility by more than a set percentage or more than a set number of standard deviations, then an alarm or alert may be issued by the monitoring system of the instant invention.
[0013] As a further example, consider the potential deliberate injection of chemically or biologically active agents into the distribution system at a point downstream of the treatment facility. A sophisticated terrorist may first inject a chlorine scavenger such as sodium metabisulfite into the distribution system to eliminate the chlorine residual normally present. At some point downstream of the metabisulfite injection point, the chemical or biological agent can be injected into the water without destruction by any residual disinfectant. Without an analytical station and monitoring system in place within the distribution system this approach could go undetected for quite some time, allowing a thorough infiltration of a biological or chemical agent throughout the distribution system. Assuming such an attack, the chlorine residual at the monitoring station would very quickly diminish to zero. A monitoring system with an active system in place to analyze the incoming data would quickly detect such an attack and sound the alarm. With historical data to compare to, the incidence of false terrorist attack alarms could be greatly diminished. For example a chlorine dosing equipment failure would be noticed at the water treatment plant providing information that a subsequent fall of chlorine concentration in the distribution system was not a terrorist attack, but an equipment failure.
[0014] In the same example of a hypothetical terrorist attack, the terrorist might try to simply overwhelm the residual chlorine in the distribution system by injecting, for example, an amount of biological or chemical agent dispersed as a fine powder in water. In this case, chlorine would fall as well but depending on the location of the sensors in relation to the injection point, the concentration might not fall to zero. However, the turbidity might well be affected. Thus a turbidity sensor in the distribution system would be an advantage in assessing a potential threat. In all cases, the need to quickly transmit raw data from both the distribution system and treatment plant to a computer system where it can be manipulated and analyzed is very important for prompt action to occur in response Co any threat Co the water system.
Summary of the Invention
[0015] The instant invention is a method for continuously monitoring a water treatment system and related distribution network providing potable water to a municipality, city, housing development or other potable water consumer. The method includes the collection of data from the distribution system and in the preferred embodiment from the water treatment facility as well. The method also includes the collection of data from advanced separation processes which are integrated into analytical instruments. The data collected are stored in a remote database on a remote server computer or bank of computers.
[0016] The data are manipulated to generate preconfigured performance, maintenance, quality assurance, quality control, regulatory, performance graphing, historical trends, and regulatory reports. The data is collected from sensors located at an equipment site and transferred to a remotely located computer using transmission means by use of the Internet where all data received can be used for the generation of reports which are accessible by Internet connection. The reports, graphs and information can be viewed online or downloaded by use of a web browser. Regulatory reports can be forwarded automatically to the regulatory agency via electronic transmission means with the added benefit of receiving reports generated directly from the sensor input thereby eliminated the possibility of human error or tampering. The method allows a single location to monitor countless customers with each customer capable of reviewing information relevant to their equipment. All information is kept confidential by use of appropriate account names, protocols and passwords.
[0017] Thus, an objective of the invention of utmost importance for security concerns is to use the data manipulation steps to continuously compare the current water treatment facility data with current data obtained from the distribution system to each other and to historical records of performance already stored in the database. As will be readily appreciated by those skilled in the art of data analysis, this can provide a powerful indicator of either normal response in the distribution system or out of bounds conditions that may require immediate notification of responsible parties preferrably by direct contact with Homeland Security.
[0018] Another objective of the invention is to provide a means for analytical devices using advanced separation processes such as ion selective membranes or electrodialysis membranes to rapidly and securely transmit their data to a remote database server computer for data manipulation and display on the World Wide Web.
[0019] Another objective of the invention is to provide a facile means to evaluate the conditions in the water treatment distribution systems as to health and safety concerns and allow this information to be shared by responsible parties via the World Wide Web.
[0020] Yet another feature and objective of the invention is to provide a means of remote monitoring advanced separation processes, water, and wastewater treatment plants in a manner that prevents any possible hacker attack to the electronic control system of the plant or process being monitored. The use of a remote database and web server allows viewers near real time access to plant performance but only allows access to web pages, not the control system. In more conventional remote monitoring applications, users or viewers need to actually connect with the computer or electronic control system which is actually controlling the plant. Thus, compromised passwords could result in an unauthorized user seizing control of the control system. In the instant invention, the control system need not be configured for remote access at all. In the instant invention, a compromised password will merely allow a remote user to see data from the process but not control any part of process, nor actually make any connection to the electronic control system of the facility, or computer attached to the electronic control system.
Brief Description of the Drawing
[0021] FIG. 1 is a flow diagram of a conventional water treatment facility and distribution system with the interfaced anti-terrorism quality monitoring system of the instant invention.
Detailed Description of the Preferred Embodiment
[0022] Referring to FIG. 1 , which shows a typical water treatment facility and distribution system, water from the supply (1) is pumped to the treatment plant. Analyzer A1 (2) and flow meter (3) collect data on the raw water supply. Analyzer A1, analyzing for turbidity, temperature, and possibly TOC (Total Organic Carbon) are not strictly necessary but if present provide better predictive reliability.
[0023] Treatment step (13) typically consists of settling and filtration to remove suspend matter. Analyzer A2 (14) monitors the efficiency of the treatment step. Disinfection step (4) allows chlorine dosed from the chlorine dosing station (5) to contact the water for a period of time, variable depending on temperature and organic matter loading in the supply water. Analyzer A3 (6) verifies that the disinfection step is working by measuring chlorine residual before entering the distribution system (7).
[0024] Analyzers A4, A5, and A6 (8) analyze for chlorine residual in the distribution system. Multifunction analyzers, the so called ab on a chip could also be used in the distribution system to analyze for constituents in addition to chlorine.
[0025] Data from the water treatment system is typically collected by a SCADA or other electronic control system (11) allowing local operators to operate and control the plant. Analyzers in the distribution system can be fitted to either send data to the treatment plant SCADA system or to the remote Database and Web Servers (10) of the instant invention. Data sending can be via transmission methods to the internet then subsequently via the Internet to said remote database and web servers.
[0026] At the said remote database and web servers, the data is manipulated, reported, and displayed for various authorized viewers and users (16). If the data manipulation indicates that alarms or alerts are warranted, the software in the database can send the appropriate notices (15). As can be readily appreciated there are many different permutations and combinations of the above system which will be obvious to someone skilled in the art of water treatment and in the art of remote monitoring. No matter the permutations, key features of the instant invention remain the same. For example, the distribution system may incorporate various additional pumping stations or head tanks (17). Similarly, the transmission methods used by the instruments and analyzers in the water, treatment system and in the water distribution system used to send data to either the remote database and web servers or to the SCADA system at the treatment facility can vary. For example, cellular phones can be used to dial either local or central Internet services providers. Radios, or so called remote terminal units (RTU) coupled to radio frequency transmitters, can also be used to send transfer the collected data to SCADA system or can send it directly to the said remote database.
Claims
I claim:
1. A system for real-time web-based monitoring of water utilities, the system comprising:
at least one data detection device configured to:
continuously scan sensor data input and send the inputted sensor data to a data management device;
receive sensor and operational data relevant to monitoring the water in a water utility system;
manipulate the received sensor and operational data; and
store the manipulated data; and
a data management device configured to:
receive the manipulated data sent from the data detection device;
evaluate the received data by continuously comparing the received sensor data with set alarm points;
manipulate the evaluated data into an analysis result:
display the analysis result and historical data in a color-coded graphical user interface, indicating normal system operation warning status, and alarm conditions;
the analysis result being continuously updated based on the incoming data and displayed in a graphical or tabular format such that an individual having been authorized to access the analysis result can assess a current state of the system performance based on the display; and
determine that an individual is authorized to receive the analysis result.
2. The system of claim 1, wherein the data detection device is configured to send the stored data via an ftp protocol.
3. The system of claim 1, wherein the customized report includes a work order with predefined inspection checklist.
4. The system of claim 1, wherein the customized report includes a summary of work order and maintenance schedule.
5. The system of claim 1, wherein the customized report includes a regulatory compliance report.
6. The system of claim 1, wherein the customized report includes a trend modeling report when conditions appear likely to exceed normal alarm conditions.
7. The system of claim 1, wherein the customized report includes a financial oversight report.
8. The system of claim 1, wherein the customized report includes an exception report indicating instances where conditions were close to triggering an alarm.
9. The system of claim 1, wherein the data management device is further configured to display the historical data in a geographical form.
10. A system for real-time web-based monitoring of water utilities, the system comprising:
at least one data detection device configured to:
receive sensor and operational data relevant to monitoring the water in a water utility system; and
a data management device separate from the data detection device and configured to:
receive the data from the data detection device;
evaluate the received data;
manipulate the evaluated data into an analysis result;
display the analysis result in a user interface; and
automatically send information relating to the analysis result to authorized individuals;
wherein the data detection device is configured to continuously scan sensor data input and send the inputted sensor data to the data management device, and
the data management device is configured to continuously compare the received sensor data with set alarm points and update the display based on newly received sensor data from the detection device.
11. The system of claim 10, wherein the data management device is further configured to display data in a geographical form.
12. The system of claim 10, wherein the sending of the information includes automatically sending the information to the authorized individuals using multimedia messaging including e-mail, pager, or facsimile.
13. The system of claim 10, wherein the data management device is further configured to display the analysis result graphically in a multi-color tabular format indicating normal system operation, warning status, and alarm condition.
14. The system of claim 10, wherein the data management device is further configured to display historical data concerning the water management system.
15. The system of claim 10, wherein the data management device is further configured to display historical data in a geographical form.
16. A system for real-time web-based monitoring of water utilities, the system comprising:
a web-based data management device configured to:
obtain periodically from one or more remote sources data based on water quality sensor readings;
compile the data into a database;
update the compiled data based on new data from the one or more remote sources;
analyze the compiled data to determine whether a predetermined alarm condition exists and whether the alarm condition satisfies a predefined requirement;
format the analyzed data into a color coded graphical display indicating normal system operation, warning status, and alarm conditions, such that an individual having been authorized to access the web-based management device can assess a current state of the system performance based on the display;
generate a customized report based on the analyzed data;
send the customized report to pre-selected recipients if the alarm condition satisfies the predefined requirement;
display the analysis result in a user interface;
continuously update the analysis result based on the updated compiled data; and
send information relating to the analysis result to authorized individuals.
17. The system of claim 16, wherein the customized report includes a regulatory compliance report.
18. The system of claim 16, wherein the customized report includes an exception report indicating instances where conditions were close to triggering an alarm.
19. The system of claim 16, wherein the information consists of an alarm signal.
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