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54 Water / Wastewater


HOW TWO MUNICIPAL WWTPs SAVED MONEY & ENERGY USING REAL-TIME INFLUENT MONITORING


In the pursuit of operational effi ciency and sustainability, wastewater treatment facilities are increasingly turning to advanced technologies. This includes using technology in locations never possible before to gather data on critical areas that aff ect treatment performance, effl uent outcomes, and energy use within the plant. Two municipal examples of this include the Sewer Authority Mid-Coastside (SAM) in California and the Charlottetown Pollution Control Plant (CPCP) in Eastern Canada who in both cases, turned to SENTRY™ Water Monitoring and Controls (SENTRY) for earlier, real-time wastewater insight using the company’s robust biofi lm-based sensors.


Better Wastewater Sampling for Better


Effl uent Outcomes Half Moon Bay, California, is home to SAM which operates a 15 million gallons per day (MGD) wastewater treatment facility serving a population of 27,000. SAM faced challenges with high and variable Biochemical Oxygen Demand (BOD) levels in its infl uent, largely due to industrial discharge in the region. Traditional BOD testing methods were slow and unreliable, prompting the facility to rely on labor-intensive Chemical Oxygen Demand (COD) sampling. Manual COD sampling and analysis requires operator time and availability meaning that samples are taken daily from Monday to Friday, and not on the weekend. This sampling regime resulted in missed infl uent events and very limited ability to act on data indicating challenging infl uent.


To address these issues, SAM installed SENTRY wastewater sensors at strategic points in the treatment process, including the infl uent and primary clarifi er effl uent. These sensors uniquely provided real-time data on infl uent BOD, organic loading, and biomass health enabling immediate operational adjustments that weren’t possible before with manual sampling. The benefi ts were substantial:


• Cost Savings: By reducing the need for manual COD sampling by 80%, SAM achieved an estimated annual savings of $50,000.


• Operational Effi ciency: Real-time monitoring allowed the facility to promptly address incoming organic loads and toxic events, maintaining stable effl uent quality.


• Future Optimization: SAM plans to expand its use of SENTRY sensors, including implementing a feed-forward aeration control system to further optimize energy use and effl uent quality.


The real-time, early-on insights SAM gained proved critical in a region challenged by industrial dischargers. Now SAM is better positioned to manage the ongoing variability and do so with less time and money.


Decarbonizing Where it’s Needed Most


Located in Charlottetown, Prince Edward Island, the CPCP has a design capacity of 7 MGD. The facility was identifi ed as a major contributor to the community’s greenhouse gas (GHG) emissions, accounting for almost one third according to the 2018 Community Inventory Greenhouse Gas Inventory. Seeking to mitigate its environmental impact, the CPCP turned to SENTRY and its partner, APG Neuros, to implement an intelligent Advanced Aeration Control (AAC) system since they knew aeration is one of the most energy intensive and expensive processes in municipal treatment facilities.


SENTRY wastewater sensors were placed upstream providing the only reliable minute-by-minute, feed-forward signal that can be used for aeration control. This allowed the AAC system to better monitor incoming organic loads which were confi rmed for accuracy using machine learning-based algorithms and


IET ANNUAL BUYERS’ GUIDE 2024/25


The Sewer Authority Mid-Coastside (SAM) treatment plant where they’re using SENTRY wastewater sensors for real-time, early-on infl uent insight to better manage variable infl uent from industrial dischargers


The zero-calibration, biofi lm-based SENTRY wastewater sensor


Charlottetown Treatment Plant where they’re using SENTRY wastewater sensors upstream to monitor incoming loading and make more accurate aeration adjustments for energy conservation


modelling before aeration adjustments were made regarding how much energy was needed to effectively treat the wastewater. This approach allowed for more precise aeration tuning and enhanced overall system performance. The results were signifi cant:


• Energy Savings: The facility validated a 14% improvement in aeration effi ciency during test periods, translating to annual savings of $30,000 in electricity costs.


• GHG Emissions Reduction: The initiative would cut GHG emissions by 65 tons of CO2


to the CO2 removal capacity of 77 acres of forest.


• Community Impact: The energy savings are suffi cient to power over 150 homes, demonstrating a tangible environmental benefi t.


equivalent annually, comparable


The CPCP’s success serves as a pioneering model for decarbonizing wastewater treatment, offering potential annual savings in the hundreds of thousands of dollars if adopted by larger cities across North America.


The Right Technology


at the Right Location The experiences of SAM and CPCP adopting SENTRY’s unique wastewater sensors highlight the transformative potential of not only using advanced technology but also of using it in new locations within a WWTP. These cases prove that having the right data when it’s needed most is powerful helping optimize treatment processes and reduce the environmental footprints of today’s plants while saving tens of thousands of dollars annually in the process.


For More Information: Visit SENTRY at www.sentrywatertech.com.


Author Contact Details Patrick Kiely, CEO • SENTRY Water Monitoring & Controls • Address: 65 Watts Avenue, Charlottetown, PE C1E 2B7, CANADA • Tel: +1 (902) 200-8632 • Email: pkiely@sentrywatertech.com • Web: www.sentrywatertech.com


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