POWER May 2013 - 81

WATER TREATMENT
fluctuating manganese in the makeup water
source, which is known to contribute to interferences
in the DPD method test results,
produced inaccurate results. The decision
was made to use the Hach amperometric test
method (Hach AutoCAT 9000 Method) to
ensure that there was no discharge of TRC
beyond the permit limits. Along with free
chlorine and TRC testing, microbial dipslide
tests (to test for the presence of microorganisms
in liquids) were performed weekly to
track the effectiveness of the biocide treatment
system.
Data collection consisted of downloading
and aggregating plant historian data plus data
from manual field tests. This historian data is
critical, as it contains important information
regarding overall plant operation, specifically
condenser and cooling tower performance.
Once the data is compiled and analyzed, the
effectiveness of the biocide program can
be quickly determined based on the performance
of the very systems the program was
designed to protect.
Review Water Chemistry
The target TRC was set as 0.35-0.5 ppm
prior to the trial. However, biological mon1.
Free chlorine in water discharge. The chemical feed rate to maintain permitted
residual chlorine levels in the discharge was established during the 45-day testing period, July
12 through August 20. Source: Nalco Chemical Co.
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
itoring using dipslides determined that a
constant 0.15-0.2 ppm TRC maintained
the bulk water biocounts well below the
industry standard of less than 104 CFU/
ml (Figure 1). Meeting the biocount standard
is particularly challenging because
the organically loaded makeup water from
the Muskingum River can rapidly change,
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CIRCLE 56 ON READER SERVICE CARD
CIRCLE 57 ON READER SERVICE CARD
May 2013 | POWER
www.powermag.com
81
Free chlorine (ppm)
8/19/2012
8/17/2012
8/15/2012
8/13/2012
8/11/2012
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8/7/2012
8/5/2012
8/3/2012
7/30/2012
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7/28/2012
7/26/2012
7/24/2012
7/22/2012
7/20/2012
7/18/2012
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7/12/2012
kalenborn

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POWER May 2013

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