Ontario Pipeline - Fall 2018 - 20

Figure 4: peCOD Oxidation Profile

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FALL 2018
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The area under this plot is directly proportional to the COD of the sample (Figure 4).
A drinking water utility in Massachusetts
has recently adopted the peCOD parameter as part of an effort to predict and
control the formation of DBPs. This utility
receives source water from a tributary of
the Connecticut River, a major watershed
providing drinking water for millions of
households in the Northeast U.S. states,
and sees a great amount of variation in
source water quality throughout the year,
and even from events such as storms and
rapid snowmelt. In early 2017, they implemented peCOD alongside TOC and UV254
in an online monitoring system, with the
end goal of using real-time monitoring of
these parameters to develop a model for
dictating treatment actions, such as pH
adjustment and coagulant dosing. The first
stage of this project is to establish baseline
conditions for each of the parameters, as
well as comparing their response to events
known to influence NOM. A few excerpts of
data from the first year of monitoring are
provided in Figure 5.
The four data graphs show peCOD,
UV254, and TOC responding to four different storm events in the summer of 2017.
There are a few interesting points to note
about the responses:
1. In the June 16-19 events, it is apparent
there is similar trending between UV254
and peCOD (TOC was offline). A large
dip was detected by peCOD before the
first event spike, which barely registered
on UV254 compared to the peak. As
this occurred for ~5 hours before the
spike, it would be relevant information

affecting treatment decisions. Also
note, UV254 experienced a sharp false
spike in the reading around 10:00 on the
19th, behaviour which causes operators
to lose faith in the measurement.
2. In the June 23-25 events, peCOD, UV254,
and TOC respond very similarly to a
short, large spike (<1h) followed by a
longer, small spike (>5h). PeCOD and
UV254 doubled, and TOC increased by
~50%. This behaviour (short, large spike
followed by long, smaller spike) was
seen on numerous occasions over the
year, and could be related to a specific
storm size/variety.
3. For July 15-17, peCOD detects small
variations over a couple days before
the event, which barely register on
TOC or UV254. When the short event
(<1h) occurred, peCOD spiked over 4x
the baseline, TOC doubled, and UV254
barely changed. This event may have
been related contamination of a specific
compound that TOC and UV254 have
difficulty detecting.
4. For August 4-6, peCOD and TOC are
compared for an event with behaviour similar to the June 23-25 events
(short spike followed by longer spike).
Interesting to note is that the second
spike of this event measured higher for
peCOD than the first spike, suggesting
that peCOD picked up on an additional
fraction of the NOM that TOC was not
able to detect.
These examples show great evidence
for the value of the peCOD parameter in
the application of source water monitoring. The data indicates that peCOD can


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Ontario Pipeline - Fall 2018

Table of Contents for the Digital Edition of Ontario Pipeline - Fall 2018

The OWWA Report
The OMWA Report
The OWWEA Report
Ontario Provincial Standards are Made for Life in Ontario
QA/QC for the Operational Lab & Online Equipment
The Perils of Misreading and Misusing Standards
Control & Prevention of Disinfection By-product Formation
The Great Lakes Water Festival
Committee Reports
Certification Corner
OWWEA Member Listing
Index to Advertisers
Ontario Pipeline - Fall 2018 - Intro
Ontario Pipeline - Fall 2018 - bellyband1
Ontario Pipeline - Fall 2018 - bellyband2
Ontario Pipeline - Fall 2018 - cover1
Ontario Pipeline - Fall 2018 - cover2
Ontario Pipeline - Fall 2018 - 3
Ontario Pipeline - Fall 2018 - The OWWA Report
Ontario Pipeline - Fall 2018 - The OMWA Report
Ontario Pipeline - Fall 2018 - The OWWEA Report
Ontario Pipeline - Fall 2018 - 7
Ontario Pipeline - Fall 2018 - Ontario Provincial Standards are Made for Life in Ontario
Ontario Pipeline - Fall 2018 - 9
Ontario Pipeline - Fall 2018 - 10
Ontario Pipeline - Fall 2018 - 11
Ontario Pipeline - Fall 2018 - QA/QC for the Operational Lab & Online Equipment
Ontario Pipeline - Fall 2018 - 13
Ontario Pipeline - Fall 2018 - 14
Ontario Pipeline - Fall 2018 - The Perils of Misreading and Misusing Standards
Ontario Pipeline - Fall 2018 - 16
Ontario Pipeline - Fall 2018 - 17
Ontario Pipeline - Fall 2018 - Control & Prevention of Disinfection By-product Formation
Ontario Pipeline - Fall 2018 - 19
Ontario Pipeline - Fall 2018 - 20
Ontario Pipeline - Fall 2018 - 21
Ontario Pipeline - Fall 2018 - The Great Lakes Water Festival
Ontario Pipeline - Fall 2018 - 23
Ontario Pipeline - Fall 2018 - Committee Reports
Ontario Pipeline - Fall 2018 - 25
Ontario Pipeline - Fall 2018 - 26
Ontario Pipeline - Fall 2018 - 27
Ontario Pipeline - Fall 2018 - 28
Ontario Pipeline - Fall 2018 - 29
Ontario Pipeline - Fall 2018 - 30
Ontario Pipeline - Fall 2018 - 31
Ontario Pipeline - Fall 2018 - 32
Ontario Pipeline - Fall 2018 - Certification Corner
Ontario Pipeline - Fall 2018 - OWWEA Member Listing
Ontario Pipeline - Fall 2018 - 35
Ontario Pipeline - Fall 2018 - 36
Ontario Pipeline - Fall 2018 - 37
Ontario Pipeline - Fall 2018 - Index to Advertisers
Ontario Pipeline - Fall 2018 - cover3
Ontario Pipeline - Fall 2018 - cover4
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