125
Figure5
Figure5.Microbial control inacooling tower simulationof conditions
that were highly conducive to heavy fouling in scaling conditions with
pH 8.5. Top panel photographs correlate with heat transfer resistance
measurements (%Clean).Evenveryheavilymicrobial fouling (photograph
on the leftcorrelatedwitha30% lossofheat transfer)wasquicklycontrolled
with practical applications of sodium hypochlorite (FRO = free residual
oxidant, as Cl2). Bottom panel: Event indicators: 1 – continuous 10 ppm
glucosenutrient feed, 5ppmphosphate concentration from scale inhibitor
andwater conditions previously shown to result in heavy foulingwithout
microbial control. Biocide applied was sodium hypochlorite at 2 ppm
NeoSens!Fouling!Sensor!Evaluation!
Data!Summary!
!
!
!
1
2
2 3
4!
5ppm
FRO
