This powerpoint presentation begins by presenting AwwaRF Project # 3022 - Cross Connection and Backflow
Vulnerability: Monitoring and Detection, and then provides project objectives that include the following:
develop occurrence data for residential backflow;
develop a multiple sensor platform (pressure transient
monitors, water quality monitors, backflow sensing meters) to
evaluate 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 and
controls;
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 fouling
frequency and maintenance requirements for 5 months; and,
ran spiking tests to determine sensitivity of monitors to small
changes for a number of 14
surrogates. Pilot test results indicated a lime spike
and 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 simulate
groundwater intrusion through a leaking pipe; and,
measured responses of pH, ORP, chlorine residual, turbidity, and
conductivity. Growth media spiking is presented, along with a field test plan. Preliminary conclusions indicate that:
water meters are capable of measuring small amounts of residential
backflow - 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 investigate
these 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 huge
amounts of data can be collected. Includes table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 30 |
| Published : | 11/01/2008 |
