and odor compound MIB on a pilot-scale
MPUV (Figure 2). UV-Cl2 AOP is dependent
on pH but appears to be more effective
with MPUV rather than low pressure. UV
doses of 100 mJ/cm2 and 250 mJ/cm2
proved effective with 20% to 90% MIB
degradation. Comparison was also made
to UV-H2O2 AOP and depending on pH,
results were very comparable. UV-Cl2 AOP
is especially promising to GCWW in terms
of cost effectiveness since a much lower
oxidant residual is needed in the reaction.
A pre-UV chlorination system has been
installed at the UV facility.
In May 2013, WRF held a Webcast
titled “UV System Start-Up, Operations,
and Avoidance of Off-Spec Water.” The
Webcast was developed in conjunction
with staff from GCWW to enhance their
training as they learn to better operate
their new UV system. Information that
the operators gained from the Webcast
included the following:
º Types of reactors and reactor compo-
º The importance of UVT and sensor
calibrations including frequency
º Power consumptions
º Complex algorithms that go behind
the scene and ease of operation
º Lamp replacement, fouling, and aging
The archived version of the Webcast is
available on the WRF Website.
IN-DEPTH RESEARCH AND evaluations
led to a successful design and construction of a state-of-the-art UV facility at
the RMTP with several unique features.
Among those are multiple operating
modes including 0- to 4-log inactivation
of Cryptosporidium and Giardia (based
on either MS- 2 or T1 validation), a user
defined emerging pathogen mode, a
low dose AOP mode with pre-UV chlorination, and inherent design to minimize
AWAD, J., R.D. Kashinkunti, N. Winnike,
and J. Malley. 2006. Finding optimum
UV disinfection location in a large water
treatment plant. IUVA News, 8 ( 1): 11-17.
HOFMAN-CARIS, C.H.M, AND E.F.
Beerendonk, eds. 2011. New Concepts
of UV/H2O2 Advanced Oxidation.
Nieuwegein, NL: KWR.
KASHINKUNTI, R.D., K.G. Linden, G.
Shin, D.H. Metz, M.D. Sobsey, M.C.
Moran, and A.M. Samuelson. 2004.
Investigating multibarrier inactivation
for Cincinnati-UV, by-products, and bio-stability. Journal AWWA, 96 ( 6):114-127.
METZ, D. H.; M. Meyer, A. Dotson, E.
Beerendonk, and D.D. Dionysiou. 2011.
The effect of UV/H2O2 treatment on
disinfection byproduct formation
potential under simulated distribution
system conditions. Water Research, 45
PLEWA, M.J., E. D. Wagner, D.H. Metz, R.
Kashinkunti, K.J. Jamriska, and M. Meyer.
2012. Differential toxicity of drinking
water disinfected with combinations
of ultraviolet radiation and chlorine.
Environmental Science and Technology,
46 ( 14):7811-7817.
RECKHOW, D.A.; K.G. Linden, J. Kim, H.
Shemer, and G. Makdissy. 2010. Effect of
UV treatment on DBP formation. Journal
AWWA, 102 ( 6):100-113.
ROSENFELDT, E., A. K. Boal, J. Springer,
B. Stanford, S. Rivera, R.D. Kashinkunti,
and D. H. Metz. 2013. Comparison
of UV-mediated advanced oxidation.
Journal AWWA, 105 ( 7): 29-33.