AWWA ACE69098

This powerpoint presentation begins by presenting AwwaRF Project # 3022 - Cross Connection and BackflowVulnerability: Monitoring and Detection, and then provides project objectives that include the following:develop occurrence data for residential backflow;develop a multiple sensor platform (pressure transientmonitors, water quality monitors, backflow sensing meters) toevaluate how to detect residential backflow occurrence; and,develop protocols for responding to backflow incidents. Background information is provided on residential meters and online water quality monitors. A pilot test plan is presented and includes the following:constructed 200' pipeloop (4" diameter) with pumps andcontrols;installed 5 water quality monitors (sidestream panels,sidestream probe, and in-pipe sonde) with data collection;TOC, chlorine, conductivity, pH, ORP, UV-Vis absorbance, turbidity,pressure, temperature;ran baseline tests (continuous flow) to determine foulingfrequency and maintenance requirements for 5 months; and,ran spiking tests to determine sensitivity of monitors to smallchanges for a number of 14surrogates. Pilot test results indicated a lime spikeand included the following: spiked solutions of varying lime concentrations (1-10 mg/L)and 1 mg/L Fe2+ in chlorine-free water in order to simulategroundwater intrusion through a leaking pipe; and,measured responses of pH, ORP, chlorine residual, turbidity, andconductivity. Growth media spiking is presented, along with a field test plan. Preliminary conclusions indicate that:water meters are capable of measuring small amounts of residentialbackflow - the public health significance of these are unclear;backflow signals from water meters may signify serious issues -utilities should have protocols in place to identify and investigatethese occurrences; water quality monitors are sensitive enough to measure small (<5%)changes in water quality for many parameters;a wide range of monitors are available for different utility needs -O&M expenditures may not be very large; and,real-time data handling and analysis major impediment as hugeamounts of data can be collected. Includes table, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

30

File Size:

1 file , 2.4 MB