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  1. af7k

    Ozone/bromine vs. chlorine dioxide

    I found that each application has appropriate disinfection so that a blanket commentary is inappropriate. One caution with bromine has to do with disinfection byproducts if this is for drinking water. Ozone does not give a measurable residual.
  2. af7k

    smelly manhole

    With respect to flow control, I designed a lift-station with PLCs with variable levels for pumping. During the night, we lowered the start level so that it maintained a shorter residence time. That took care of H2S. We had problems with normal sewage odors and ended up sealing the station...
  3. af7k

    Velocities in pipes

    An incredible head loss.
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