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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

369
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
369

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Colorimetric Paper-based Detection of Escherichia coli, Salmonella spp., and Listeria monocytogenes from Large Volumes of Agricultural Water
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REAL TIME MONITORING FOR PATHOGENS IN WATER.

Syreeta L Miles1, Ian L Pepper1, Ryan G Sinclair2

  • 1Soil, Water, and Environmental Science Department, University of Arizona, Tucson, Arizona 85719.

Water Distribution Systems Analysis ... : Proceedings of the ... Water Distribution Systems Analysis Conference. Water Distribution Systems Analysis Conference
|September 17, 2025
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Summary
This summary is machine-generated.

Real-time water quality sensors can detect microbial contaminants like E. coli in water distribution systems. These sensors show a useful dynamic range for early warning systems against contamination events.

Keywords:
drinking wateronline monitoringpathogens

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Area of Science:

  • Environmental Science
  • Microbiology
  • Sensor Technology

Background:

  • Growing concerns about bioterrorism and infrastructure resilience necessitate real-time monitoring of biological contaminants in water distribution systems.
  • Water utilities are increasingly adopting commercially available sensors, requiring independent evaluation for performance and integration capabilities.
  • Supervisory Control and Data Acquisition (SCADA) systems require reliable sensor data for effective water management.

Purpose of the Study:

  • To independently evaluate the performance of commercially available real-time sensors for detecting microbial contaminants in water distribution systems.
  • To assess the capabilities of sensors in identifying Escherichia coli (E. coli) intrusions under realistic conditions.
  • To determine the suitability of these sensors for integration into existing water quality monitoring and SCADA systems.

Main Methods:

  • A field-scale test-bed laboratory was utilized for rigorous evaluation protocols.
  • Four types of water quality sensors were tested: HACH Guardian Blue, JMAR BioSentry, S::CAN spectro::lyser, and GE 5310 total organic carbon.
  • Sensors were challenged with E. coli intrusions at concentrations ranging from 10^3 to 10^6 colony-forming units per milliliter (cfu/mL) in both deionized and tap water.

Main Results:

  • Most evaluated sensors demonstrated responsiveness to increasing E. coli concentrations within the 10^3 to 10^6 cfu/mL range.
  • A useful dynamic range for detection was observed between 10^3 and 10^6 cfu/mL.
  • Sensor performance degraded below 10^3 cfu/mL (indistinguishable from noise) and above 10^6 cfu/mL (saturation and mis-classification).

Conclusions:

  • Select real-time sensors are capable of detecting microbial water quality changes in distribution systems.
  • These sensors can serve as a component of an early warning system for monitoring contamination events.
  • Independent evaluation is crucial for optimizing sensor use and ensuring reliable performance in water infrastructure security.