>

The Undeniable Link between Biological Growth & Pipeline Degradation

 

Much has been said about the immediate benefits of 2nd Generation ATP monitoring to reveal regrowth hotspots in water distribution system. Having this data available in the field enables water technicians to instantly flag water samples that contain elevated microbiological content, trace the problem to its source, and then guide maintenance activates (e.g. flushing) in real-time to adequately solve the problem without being wasteful of time or water in the process. However, the long-term benefits of an optimized water quality monitoring program guided by ATP monitoring can yield even greater economic benefits.

Perhaps the most costly of all issues that drinking water utilities deal with is repairing line breaks. In the USA, drinking water utilities typically experience 23-27 line breaks per 100 miles of pipe per year, each of which carrying a direct cost of approximately $3000 for each event (Kirmeyer, Richards, and Smith, 1884). Based on these figures, the following examples put this cost in perspective:

Table 1: Sample of Cities of Various Sizes and Anticipated Line Break Frequency

LocationMile of PipeProjected # of Line BreaksAnticipated Repair Costs* (USD)
Phoenix5,4001350$4,050,000
Dallas4,6001150$3,450,000
Kansas City1,912478$1,434,000
Macon1,400350$1,050,000

*Assuming 25 line breaks/100 miles of pipe/year

Based on the results shown in Table 1, the costs associated with line break repairs can put a tremendous burden on water utilities so it is certainly in the best interest of the city to minimize these costs. Investigating the issue further, it has been reported that of the total number of line breaks, typically 50% are due to construction accidents that accidentally penetrate water lines. That leaves the other 50% being due to degradation of the pipes itself which is very strongly influenced by the effectiveness of the microbiological control that the utility maintains. The control of the following corrosion-causing issues can be directly addressed through an enhanced water quality control program using ATP monitoring:

  • Microbially-Influenced Corrosion (MIC) – Elevated microbiological growth within water distribution lines inevitably result in biofilm formation. The adverse effects of biofilm are many (e.g. corrosion, premature loss of disinfectant residual, protection of biomass from disinfectant, etc.) and it is also very time-consuming to remove it through flushing. Repeated formation of tubercles and their subsequent removal through aggressive flushing also take their toll on the integrity of pipes.
  • Chlorine/Disinfectant Dosage – As mentioned in the previous point, the tendency of biofilm to prematurely consume disinfectant residual usually results in treatment facilities boosting the dosage to ensure that a sufficiently high residual is maintained throughout the system. The corrosiveness of chlorine then becomes an even bigger issue with more of it needing to be added. Maintaining water quality through ATP monitoring can result in reduced biofilm presence which would otherwise consume disinfectant and further promote corrosion.

Needless to say, bolstering your microbiological control program using 2nd generation ATP monitoring enables water managers to get out in front of this problem by properly handling distribution system regrowth in a pro-active way rather than reactively. Assuming that corrosion can be reduced by as little as 10% through enhanced water quality control (a conservative estimate) would still translate to enormous savings that would eclipse the investment involved in adopting 2nd generation ATP monitoring and produce tremendous economic returns. This also says nothing of the much more immediate ROI that would be seen through flushing and field service optimization by saving tremendous amounts of water as well as time.

Reference:

Kirmeyer, G.J., W. Richards, and C.D. Smith. 1994. An Assessment of Water Distribution Systems and Associated Research Needs. Denver, Colo.: Awwa Research Foundation and American Water Works Association


Dave Tracey

Dave has been with LuminUltra since Day 1 and is proud to have been able to contribute from its early days as a small start-up to the company that it is today. He has served in a wide range of roles during that time, from producing reagent and conducting laboratory experiments through to his current position. Nothing is more important to Dave than family, whether it’s his two young sons or his fellow Sales & Marketing teammates. In both cases, he’s well aware that he wouldn’t be much without them. Originally a graduate of the Chemical Engineering program at the University of New Brunswick, his alma mater has come full circle 14 years later with Dave now serving as a mentor for final year ChE students during their senior plant design projects.

Related Posts

Water Calculation Tools

  There are many water use resources available on the internet. At LuminUltra, we work in the water microbiology field, but we also pay attention to what’s going on in the larger world of water. We’ve come across some neat sites over time, so today we present this list of online water calculation tools: Water… Read More

Water and the Olympics

  At the Winter Olympics in PyeongChang, South Korea, hundreds of millions of people around the world watched as athletes competed in dozens of sports over two weeks. For some sports, water (usually in the form of snow or ice) is crucial. Where the Summer Olympics need pools and lakes filled with clean water for… Read More

Most Wanted Microbes – Nitrifiers (a.k.a. Nitrosomonas)

  From the editor: This is the fourth post in an ongoing series profiling microorganisms of particular significance in water and wastewater systems. In this series we will cover microorganisms of many types including some that are beneficial, inhibitory and pathogenic.  Nitrification is a two-part process whereby ammonia is converted to nitrate. The first step… Read More

© 2020 LuminUltra |