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Hamilton Water Treatment Plant Meeting 10-10-2023

In attendance:

  • John Bui
  • Jay ?
  • Sudhir
  • Jake

Meeting Notes​

  • Two plants, 6 mgd and 40 mgd outside of Hamilton, OH proper. At the 40 one now.

  • Chlorite? dioxide disinfectant

  • .45 in summer

  • Lowest .05 to max of .8

  • US filters, evoqua? manufacturers of their hardware to create the disinfectant

  • Sensor method (electro chemical) for testing, down to 7 min from an hour, very reliable, much quicker. The method they use here for chloride testing. Palintest. kemio disinfection for chlorites and ____ dioxide.

  • 25% sodium chlorite solution and gas chlorine to generate the disinfectant.

  • 6 gal. 5 wells onsite. Built in 1935.

  • 16 wells in bigger facility.

  • All their water comes from wells.

  • Sourcewater protection. Groundwater consortium. 7 members. Includes private and public groups. They all fund it. GCWW, Fairfield, butler co, miller coors, hamilton. Semiannual training. Collect samples for contaminants, water levels.

  • Distribution system. 5 el tanks, 6 pump stations, 6 prvs, 7-8 pressure zones. 817 is main. Peak dominance. Average PSI is around 60-135 PSI.

  • This facility 6 high pump, 4 700 hp, 2 450 hp. 4 stage vertical turbine pumps.

  • Pumps put in early 90s, efficiency is ok but not the greatest.

  • 344 miles of water main. 2 in to 36in. Some are over 100 years old (cast iron).In the early 90s, put in some hdpe pipe not knowing how the disinfection would affect it. Literature then indicated should have been fine. Turned out not the case. Lasted 10 years only. There was a flaw in the study. Water just sat in the line. It didn't flow.

  • Oxidized the polymers, made pipes rigid, change in pressure, ruptured. Always split on the top.

  • Add disinfectant as something to keep in mind for pipe breaks AI analysis.

  • 25 miles of hdpe still remaining.

  • 15 years ago did a condition assessment. Big list of mains that need replacement. They've been working through those. Engineer study, not using the AI pipe breaks. Interested in some of the newer technologies? They might be. That would be out of distribution.

  • Leak detection? Use anything for that? Echo accoustics? That's always a problem. They knew about a leak, took several years to actually get it repaired. 24 inch steel line put in early 30s. Lot of holes. Rust. Near powerplant. 1.3 mgd water lost from that pipe.

  • They're working on completing their distribution water model with GIS. Working with Hazen (sp?).

  • They had bentley but are trying to switch to infowater.

  • Not sure if they will manage it in house or continue contracting to pay for the maintanence.

  • Get a contact in their engineering dept?

  • Currently averaging 16 mgd, in a couple years will average 26 mgd.

  • Pressure management. Watch pressure on customer side to get a better/cheaper feel.

  • Currently tracking total system usage in/out via Excel.

  • Do a pilot with them? Moving Excel to the hydrotrek software? Maybe.

  • Manually set pressure on PRVs. Not radio controlled. They don't change settings on the PRVs. Mostly used in the intermediate areas.

  • WW plant 32 mgd. Do about 8 mgd of treatment. Stormwater capac of 65 million. Short duration can store. If too long, they would just blend it.

  • Activated sludge system, bubbles, diffuser, press.

  • That plant was constructed in the 40s (maybe?)

  • They had a consent decree in 92. They had to complete in oct 2013.

  • In pipe flow monitoring. SSO. No combined sewers.

  • Condition assessment. CCTV. They have a couple trucks. Do the analysis in house. Can't say if PACP based.

  • Pipe logic software.

  • They'll talk w. collection sys superintendent to see if something they're interested in.

  • Strand is looking at bio filtering.

  • Membrane bio reactors?

  • Quite a few lead service lines. Going through inventory count. Using GIS with historic knowledge knowing what areas are likely. Jon isn't involved with that project though. From the City level not water utility. Environmental section of the city. He can get us their name. Wanted to have interns go door-to-door and use residents to get inventory of lead service lines.

  • Interested in an AMI system. To be able to look at the whole system at any time. He's pushing for it, but upper management says it's too much money and not priority, probably not even on the horizon.

  • Vibrations maybe?

  • Remote pump stations, wells. Not just here.

  • Temperature too could be beneficial.

  • More sensors on those to avoid more manual inspections.

  • Could connect it straight to the SCADA system (snyder) to avoid more complicated telemetry.

  • Anyone who uses groundwater would be a good candidate.

Last updated on by jacobgqc