Abstract
The deterioration of drinking water during distribution process is caused by many factors. The microorganisms and substances peeling off from the “growth-ring” make the secondary pollution in drinking water distribution systems. To reduce the secondary pollution, two-phase pulse flushing technology is introduced to quickly remove the “growth-ring”. In this study, experiment is undertaken for investigating the efficiency of the two-phase pulse flushing and finding the best setting combination. A case study is undertaken to compare the efficiencies between the two-phase pulse and the single-phase flushing. The best setting combination of the two-phase pulse flushing is at the frequency 4 s–6 s (air inflow time is 4 s and air cut off time is 6 s) and the round air inflow nozzle is set at the bottom of the pipe. Two-phase pulse flushing technology can save 95% of water and 6 h 40 min flushing time.
Highlights
The water consumed by the consumers travels large distances and takes long durations through the water distribution system
Sediments attach on the pipe wall, and they can interact with the pipe wall materials by chemical or electrochemical processes and microorganisms, which forms an irregular “growth-ring”
“growth-ring” into bulk water is the main mechanism of the secondary pollution in drinking water distribution system [8]
Summary
The water consumed by the consumers travels large distances and takes long durations through the water distribution system. The secondary pollution causing deterioration occurs after clean drinking water leaves the treatment plant. The secondary pollution is mainly caused by the so-called “growth-ring”. The microorganisms and substances peeling off from the “growth-ring” into bulk water is the main mechanism of the secondary pollution in drinking water distribution system [8]. Leakage because its growth occupies the room for water distribution. It is imperative to growth occupies the room for water distribution. It is imperative to reduce the influence of reduce the influence of the “growth-ring” in order to improve the drinking water quality. The influences of different pulse frequencies, shapes of inlets and locations of the inlets are discussed in order to obtain the best setting combination. Comparison between two-phase pulse and single-phase flushing is presented in this paper
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