Aeration On
Lab Parker Hannifin
120 100
53% TTHM Removal
80 60 40
02-Oct-13
27-Sep-13
22-Sep-13
17-Sep-13
07-Sep-13
02-Sep-13
0
12-Sep-13
14-Day Tank Equilibration
20
28-Aug-13
There are also a number of excellent success stories for the energy-optimised aeration and mixing “THM Reduction System” known as TRS. Results from the installation of a PAX TRS system in a 30 ML reservoir at Hunting Hill in the city of Rockville, Maryland, showed an average THM reduction of 53% in the reservoir (see fig 2). In another example with a 750,000 litre reservoir in North Carolina, pre-installation THM levels of up to 140 ppb were reduced by 99% in samples collected after a smaller TRS installation.
Aeration Off
140
TTHMs [ppb]
Proven Results - Iain Weir, Chief Technical Officer at Panton McLeod, said “Research in the United States has shown that active mixing not only eliminates short-circuiting in water storage assets, but also significantly improves chlorine residual levels (Grayman et al., 2004). Results, including from the installation of a PAX Water Mixer in a 2.3 ML reservoir (Enfield Basin) near Melbourne in Australia support this.” (see fig 1)
fig 2: TTHM levels in water leaving the Hunting Hill tank with the TRS off (shaded in gray) compared with THM levels with the TRS on. After the TRS is turned on, time is required for the TTHM levels to reach a steady-state level of reduction – in this case 14 days
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