Online Methodology for Determining THM Formation Potential & Predicted Network TTHM Levels

Transcription

1 Online Methodology for Determining THM Formation Potential & Predicted Network TTHM Levels Presented by: Tom Williams, Business Development Manager Alabama/Mississippi Section of the American Water Works Association 2016 Conference

2 Aqua Metrology Systems US based company with R&D and Technical Support in Sunnyvale, CA and manufacturing in Lowell, MA and Seattle WA. Started life in the semi conductor industry Founded in 2007 to focus on TTHM and HAA Monitoring with 2013 USA Stage 2 DBP regulations in mind. Now have installations in 20+ States, the US Air Force (Suez AgBar, Aqua America, East Bay MUD, Scottish Water) Acquired on-line trace metals monitoring business in December 2014 (Arsenic, Chromium, Selenium, Lead etc.) Market leader. Established presence across the USA and Europe Data driven process engineering company. 2

3 Smart Networks Getting better performance from the same basic engine. 3

4 Smart TTHM Monitoring Lab Network 4

5 % Error CH1-3 % Error CH1-3 Reliability: Labs vs. Online (ISO accredited for reporting Suez Agbar) 5 US-EPA Accredited Labs & 3 THM-100 Monitors (current studying 60 labs nation wide) Sample Water Spiked at TTHM 79.5 ug/l (60% CH 3 ) Lab 1 Lab 2 Lab 3 Lab 4 Lab 5 THM THM THM % Error CH % Error CH3 5

6 The Value of Real-time THM Data Online THM Monitors Contribute to Effective Design, Project Validation, and Process Control

7 Co-operation between Lab and Ops Data oud

8 Total THM, ppb Online THM Monitors Optimize Process Controls and provide Baseline Unpredictable changes in raw quality are easily identified Measure TTHMs/THM-FP values under dynamic conditions Process controls can be put into place to match water quality Blend PSC NBA Avg Daily THM

9 Online THM Monitors Help Validate Pilot Study Results or Upgrades Timely Cost-effective Aeration On Aeration On Allows for real-time process optimization Aeration Off Aeration Off

10 Controlling Purchased Water Quality in a Consecutive System 10

11 The Reaction Online Monitors Contribute to Effective Design, Project Validation, and Process Control

12 Disinfection By-Product Formation DBPs Naturally-Occurring Organic Matter (NOM) e.g. - Humic Acids - Fulvic Acids Chlorine Based Compounds for Microbiological Disinfection e.g. - Chlorine - Hypochlorite - Chlorine Dioxide Disinfection By-Products* - Several thousand are known - More than 500 have been toxicologically reviewed - Several classes and compounds are regulated in drinking water: Trihalomethanes Disinfection By-Products* e.g. - Trihalomethanes - Haloacetic Acids - omate - Chlorite Haloacetic Acids 12

13 Halogens the Halo s in THM s 13 halogen molecule structure model d(x X) / pm (gas phase) d(x X) / pm (solid phase) fluorine F chlorine bromine iodine I

14 THM Formation: 14 The DBP Reaction H H H H CO2H CO2H CO2H H CO2H CO2H CO2H H H CO2H CO2H CO2H C H H H H l

15 The THM100 Formation Potential Method Online Monitors Contribute to Effective Design, Project Validation, and Process Control

16 Case Study- Aigües de Barcelona Sant Joan Despí WTP Servicing > 3 million people Mixed conventional & advanced treatment Wanted continuous and realtime measurement of THM Formation Potential Worked with Aqua Metrology Systems to develop an accelerated online THM-FP method 6-month study results presented

17 Options for Measuring THMS & THM Formation Potential (THM-FP) Standard THM Method Not automated, grab samples, ~2 weeks for results Online THM Monitor Real-time, automated process, ~120 minutes Standard THM-FP Method Not automated, 7-day sample incubation,20 C reaction temp., ph buffering and addition of 2 NEW- Accelerated Online THM-FP Method

18 Sant Joan Despí WTP THM Monitoring 5 online THM analyzers 1 THM-100 unit monitors THM at WTP 1 THM-100 unit monitors THM levels in network (Beques III Water Storage Tank) 3 THM-100 units in network, including points of handover compliance with other utilities The THM-100 at the WTP was modified to undertake accelerated online THM-FP measurements

19 TTHM Levels THM-Forming Reaction Accelerated Online THM-FP Method - Customized to match network TTHM Levels - Software parameters determine the extent of THM Formation (Reaction Time & Temperature) TTHM-FP Level TTHM Network Level Standard Method THM-FP 2 Booster WTP TTHM Level Water age (Contact time with 2 ) End of Network 7 days

20 San Joan Despí WTP & Network TTHM Values

21 Sant Joan Despí WTP THM & THM-FP Levels

22 Sant Joan Despí WTP THM-FP & 72-hr Time-Shifted Network TTHM Levels

23 PN-THM Derived from Online THM-FP Values, Compared with actual Network TTHM Levels

24 Conclusion Online THM-FP monitoring allows modeling, in near real-time, of THM values that will be reached in the distribution network several days later This novel accelerated online THM-FP methodology helped Aigües de Barcelona: Optimize treatment processes Assist in monitoring water quality at handover points Reduced expenses while ensuring regulatory compliance Other utilities are now using this methodology to determine THM-FP levels in their network

25 Real-time Water Quality Data Drives Smart Decisions Online THM monitors provide high-frequency, unattended, real-time and accurate results for TTHM/THM-FP values Online THM monitors provide baseline data on plant or network TTHM/THM-FP values in potable and wastewater applications Online THM monitors provide the necessary operational data on TTHM/THM-FP values to validate pilot/engineering studies Online THM monitors help manage treatment controls; leading to process optimization and cost minimization

26 Thank you Tom Williams USA: UK: E: