U.S. Environmental Protection Agency
                                                    NSF International
                      ETV Joint Verification Statement

        Ultraviolet (UV) Disinfection
        Secondary Effluent Treatment and Reuse
        Barrier Sunlight H-4XE-HO Open Channel UV System
        UV Validation and Research Center of New York
        Siemens Water Technologies Corp.
        1901 West Garden Road            PHONE: (856) 507-4149
        Vineland, NJ 08360
        http: //www.siem en s. com
FAX: (856) 507-4215
NSF International (NSF), in cooperation with the U.S. Environmental Protection Agency (EPA), operates the
Water Quality  Protection Center  (WQPC), one  of  six centers under the  Environmental  Technology
Verification Program (ETV). The WQPC recently evaluated the performance of the Barrier Sunlight H-4XE-
HO Open Channel UV Disinfection System (4XE System), manufactured by Siemens Water Technologies
Corp.  The 4XE System  was tested at the UV Validation and  Research Center of New York located in
Johnstown, NY. HydroQual, Inc. was the Testing Organization for this verification.

EPA created ETV to facilitate the deployment of innovative or improved environmental technologies through
performance verification and  dissemination of information. The Program's goal is to further environmental
protection by accelerating the acceptance and use of improved and more cost-effective technologies. ETV
seeks to achieve this goal by providing high quality, peer-reviewed data on technology performance to those
involved in the design, distribution, permitting, purchase, and use  of environmental technologies.
ETV works in partnership with recognized standards and testing organizations; stakeholder groups, which
consist of buyers, vendor organizations, and  permitters;  and  with  the full participation of individual
technology developers. The program evaluates  the performance of innovative technologies by developing
test plans that are responsive to  the needs  of stakeholders,  conducting field or  laboratory tests  (as
appropriate),  collecting and  analyzing data, and preparing peer-reviewed reports.  All  evaluations  are
conducted in accordance with rigorous quality assurance protocols to ensure that data of known and adequate
quality are generated and that the results are defensible.
The accompanying notice is an integral part of this verification statement.

                September 2009

The following description of the Barrier Sunlight H-4XE-HO Open Channel UV (4XE) System was provided
by the vendor and does not represent verified information.
The  4XE System utilizes 16 high-output, low-pressure  lamps oriented horizontally and parallel to the
direction of flow.  The lamps are housed in two modules, each containing eight lamps. Each lamp has a UV
output of approximately 60 Watts at 254nm and a total power draw of  175 Watts.   The  lamps are
approximately 60  inches long. Each lamp is housed in a clear fused quartz sleeve to isolate and protect the
lamp from the wastewater. The sleeves have only one open end, which are sealed with the lamp power cable
plug.  These quartz sleeves are 70 inches long, have an outer diameter of 28mm, a wall thickness of 1.5mm
and a UV transmittance (UVT) of 91%. The 4XE System is equipped with automatic sleeve wiping systems,
the performance of which was not verified during testing.
The  lamps in the unit  are powered  from electronic ballasts mounted vertically in a remotely located
enclosure. Each ballast powers two lamps in parallel so that one lamp failure does not cause the peer lamp to
turn off.  The 4XE System used for this verification was equipped with a SLS SiC004 UV intensity sensor
certified to DVGW (German Technical and Scientific Association for Gas and Water) Standards.  One sensor
was installed on the top cover of the lamp rack, approximately 2 cm from a lamp sleeve in the top row.  The
sensor includes a remote,  dedicated  amplifier that operates on a 4-20 mA signal.  The  sensor has  a
wavelength selectivity of 96% between 200 nm and 300 nm, a linear  (1%)  working range  of 0.01 to 20
mW/cm2, and a stability of 5% over 10 hours and a temperature range of 2 to  30°C. The commercial unit is
typically designed to operate at 100% input power (no lamp dimming).
The total intensity attenuation factor was set by Siemens for this verification at 80%, based on the combined
effects of a sleeve-fouling factor of 90% and a lamp-aging factor (end-of-lamp-life factor) of 90%.  This
lamp-aging factor is set based on a minimum of 12,000 operating hours. The 4XE System verified in this
ETV test is designed to  operate at flow rates of up to 868 gallons per minute (gpm), equal to 1.25 million
gallons per day (mgd).
The objective of this verification was to verify the performance of the system within broad operational limits,
taking into account flow rate, UV sensor reading, and UV sensitivity. Information found in several sections
of the USEPA Ultraviolet Disinfection Guidance Manual for the Final Long Term 2 Enhanced Surface
Water  Treatment Rule  (2006) (UVDGM), support that operation within  these  limits  should result in
successful disinfection  for  the targeted  organisms.  The testing included measuring or calculating the

1.  Performance  difference of the system between power turndown and  UVT turndown at the same
    operation conditions to mimic the total attenuation factor.  The method that yielded the lower Reduction
    Equivalent Dose (RED) was selected to simulate the total attenuation factor in the verification.
2.  Flow-dose relationship for the system at a nominal UVT of 50% to 80% for a dose  range of 5 to 25
    mJ/cm2 using a biological surrogate with relatively high sensitivity to UV  (Tl coliphage).
3.  Flow-dose relationship for the system at a nominal UVT of 50% to 80% for a dose range of 10 to 40
    mJ/cm2 using a biological surrogate with medium sensitivity to UV (Q(3 coliphage).
4.  Flow-dose relationship for the system at a nominal UVT of 50% to 80% for a dose range of 20 to 80
    mJ/cm2 using a biological surrogate with relatively low sensitivity to UV (MS2 coliphage).
5.  Adjusted observed RED performance results by a Validation Factor (VF) to account for uncertainties
    associated with the verification tests.
6.  Power consumption and head loss.
09/32/WQPC-SWP      The accompanying notice is an integral part of this verification statement.         September 2009


The testing methods and procedures employed during the study were outlined in the Verification Test Plan
for the Siemens Water Technologies V-40R-A150 and HE-2E4-HO Open Channel UV Systems for Reuse and
Secondary Effluent Applications (August 2008). A full-scale 4XE System (the system model designation was
changed from the HE-2E4-HO prior to the start  of the ETV test) was installed in a test channel at the UV
Validation and Research Center of New York (UV Center), located in Johnstown, NY.  Further details on the
testing procedures, analytical methodology, and QA/QC information are provided in the final report.
Biodosimetric tests were conducted at a simulated total attenuation factor of 80%, representing the combined
effects of the end-of-lamp-life (EOLL) factor and the fouling factor.  The total attenuation factor for the 4XE
System was simulated by lowering the water transmittance. For the three nominal UVT values tested for this
verification, 80%, 65%, and 50%, the actual UVT levels that were needed to include simulation of the 80%
sensor attenuation were 74.5%,  60.4% and 45.8%, respectively.  The  reported RED  is  based on the
collimated-beam dose-response curve generated on a seeded influent sample from the same day of testing. A
total of 31 flow tests, using three  different coliphage  (MS2, QP and Tl), were conducted for this ETV test.
These tests were successfully completed during  the verification, which resulted in development of a RED
performance algorithm that described the performance of the UV system over a range of observed RED. A
validation  factor was  determined to account for biases  and  experimental uncertainty  that allows
determination of the credited RED for various UV transmittances.
Performance verification was accomplished by determining the system's RED, the dose equivalent to that
delivered by a collimated beam to achieve the same log inactivation.  The biodosimetric RED data were
determined as  a function of flow  per lamp, as presented in Figure VS-1 for each challenge phage at their
respective nominal UVT levels.  The bounds described by these data represent  the validated operating
envelope for the UV system:

                      Flow:          134 to 866 gpm;
                      Flow/Lamp:    8.37 to 54.14 gpm/Lamp;
                      UVT:          50 to 80%; and
                      Power:         100 at PLC, or 100% input (2.75 kW/16 Lamps, or  171 W/Lamp).











• MS2, Nominal UVT = 80%
• MS2, Nominal UVT = 65%
A MS2, Nominal UVT = 50%
• T1, Nominal UVT = 50%
• QB, Nominal UVT = 80%
*QB, Nominal UVT = 65%
• QB, Nominal UVT = 50%



                    0    5   10  15   20  25  30   35  40   45  50  55   60  65   70
                                     Flow Rate per Lamp (gpm/Lamp)
              Figure VS-1. MS2, Tl and QP RED as a function of UVT and flow/lamp.

09/32/WQPC-SWP      The accompanying notice is an integral part of this verification statement.         September 2009

RED Performance Algorithm

A dose algorithm was developed to correlate the observed MS2, Tl and Q(3 RED data with the reactor's
primary operating variables, namely, the flow rate per lamp (Q/L) and sensor reading (S - a function of the
lamp output and the UVT).  In an operating  system, these variables are known on a real-time basis by the
PLC and  can be programmed into software to monitor and control the  UV system.  Because multiple
surrogates were used to test the  system,  it is  possible to combine  the test results  and incorporate the
sensitivity of each to differentiate their individual reactions  at the specified operating  conditions.  The
commissioned system can then incorporate  the sensitivity of the targeted pathogen (e.g., total or fecal
coliform, enterococcus,  etc.) when calculating the RED delivered by the  system.  The  dose algorithm to
estimate the RED is expressed as:

                                 a          bed
                       RED =10   -(Q  I  L}  -S   -UVS

Where:                Q             = Flow rate, gpm;
                      L             = Number of Lamps;
                      S              = Sensor Reading (%);
                      UVS           = UV Sensitivity (mJ/cm2/Log Inactivation (LI)); and
                      a, b, c, d        = Equation coefficients.
It is critical to note that the same sensors and their installed conditions, such as model type, position relative
to the lamp,  sleeve clarity, etc.,  must be used to  apply this algorithm. This algorithm is  valid if sensor
readings are  confirmed to meet the modeled  results as a function of UVT and power setting. Based on the
multiple  linear  regression  analysis of this RED  equation,  the coefficients were determined and are
summarized in Table VS-1.  The algorithm-calculated REDs versus the observed MS2, Tl and Q(3 REDs are
plotted in Figure VS-2.  Good agreement is observed between the predicted and observed RED.

             Table VS-1. H-4XE-HO (2W-1B-1C) Dose-Algorithm Regression Constants

                     Coefficient	a	b	c	d
                     Value       0.950550  -0.609884    0.683241    0.398391
Validation Factor (VF)
The  Validation Factor (VF) quantitatively  accounts for certain biases and experimental uncertainties to
assure that a minimum disinfection performance level can be confidently maintained. VF components RED
bias  (BRED), polychromatic bias (BPOLY) and validation uncertainty (UVai) were assessed. BRED can be set at
1.0 as long as the sensitivity of the targeted pathogen or pathogen indicator is within the range of 5 and 20
mJ/cm2/LI  (log inactivation), and the sensitivity used in the RED algorithm is equal to or less than the
sensitivity of the targeted microbe.  BPOLY is set to 1.0 because the system uses low-pressure monochromatic

Within the UVai, the uncertainties associated with the sensors (Us) and the collimated beam tests (UDR) can be
ignored because QA criteria were met, leaving only the uncertainty of interpolation (U:N). The VF can be
expressed as a function of the UIN, which is related to a statistical evaluation of the verification data set. The
VF reduces to the following expression as a function of the calculated RED (REDCalc):

                                     VF= 1 +(6.017/REDCaic)
09/32/WQPC-SWP       The accompanying notice is an integral part of this verification statement.         September 2009






n -












J\S2 -

*^ **

                                                                         100   110
                                         Observed RED (mJ/cm )
                   Figure VS-2. Algorithm calculated RED versus observed RED.
Figure VS-3 presents a series of solutions for VF at a UVT of 50% and sensitivities ranging between 5 and
20 mJ/cm2/LI.  The VF is shown as a function of Q/L under these specific and fixed operating conditions.
Similar calculations can be made at alternate operating conditions. These calculations are appropriate only
when the UVS of the targeted pathogen is equal to or greater than the sensitivity chosen for the calculations.
If the sensitivity of the  organism of concern is 10 mJ/cm2/LI, then UVS must be 10 or less when conducting
the calculations for the  VF. However, if this is not the case, then a RED bias term, similar to that described
by the UVDGM, would have to be incorporated into the validation factor.
                    Validation Factor at 50% UVT
• UVS=5mJ/cm2/LI
• UVS = 11 mJ/cm2/LI
 UVS = 15mJ/cm2/LI
• UVS=20mJ/cm2/LI
               0     5   10    15   20   25   30    35   40   45    50   55   60   65   70
                                     Flow Rate per Lamp (gpm/Lamp)

   Figure VS-3. Example solutions for VF at fixed operating conditions and a range of UV sensitivities.
         The accompanying notice is an integral part of this verification statement.

                September 2009

Credited RED Calculation
As outlined in the UVDGM, given the calculated RED results and the estimate of uncertainty associated with
the  experimental effort, the RED that can be applied, or credited, to the  system at prescribed operating
conditions can be determined.  This credited RED, which is the same as REDVai, is calculated as:
Figure VS-4  presents solutions for the 4XE System at a  UVT of 50%,  across the same  range of UV
sensitivities.  Similar graphical plots can be generated by the user at alternate conditions. It is important to
note that this  assumes the system sensors have been confirmed to have the same output as in the validation.
The solutions for credited RED (REDVai), such as those shown on Figure VS-4, would be reported at the PLC
of the 4XE  System, based on  monitored  real-time operating conditions. Calculations  and results  for
alternative UVT levels are presented in the final report, along with a design example.
                                                                   UVS = 5 mJ/cm2/LI

                                                                   UVS = 8 mJ/cm2/LI

                                                                   UVS = 11 mJ/cm2/LI

                                                                   UVS = 15 mJ/cm2/LI

                                                                   UVS = 20 mJ/cm2/LI
        Validated RED at 50% UVT
                         10    15   20   25   30   35   40   45   50   55
                                    Flow Rate per Lamp (gpm/Lamp)
                                                            60    65   70
             Figure VS-4. Credited RED at 50% UVT across a range of UV sensitivities.
Power Consumption

The power consumption of the  Siemens H-4XE-HO (2W-1B-1C) system was continuously logged when
operating. The mean total power input was 2.75 kW, or 171 W/Lamp.


Headless estimates  were derived from the hydraulic profile  data.   Two pressure  monitoring  locations
(immediately before and after the unit) were used at eight different flow rates, ranging from 0.2 to 1.26 mgd.
The headless for the unit can be estimated from the expression (should not be extrapolated outside tested
range of flow rates):

        Headloss (inches of water) = 3.160 (flow, mgd)2 - 0.938 (flow, mgd) + 0.148

Velocity Profiles

Cross-sectional velocity measurements were taken at 0.2  and 0.8 mgd, short of the full flow range tested in
the biodosimetry tests (0.2 to 1.25 mgd). The hydraulic conditions during validation represent a 'worst' case
The accompanying notice is an integral part of this verification statement.

September 2009

when compared to minimum full-scale commissioning requirements in the NWEJ/AWWARF Ultraviolet
Disinfection Guidelines for Drinking Water and Water Reuse (2003). Guidance states that the mean velocity
at any measured cross-sectional point of a commissioned system should not vary by more than 20% from the
theoretical average velocity  (i.e., flow divided by the cross-sectional area).  Further, the  commissioned
system should exhibit velocity profiles that are equivalent or better than those exhibited by the validated test
unit.  As such, the biodosimetry performance data can be considered conservative.
Overall,  a general observation was that the velocity profiles were more variable  at 0.8 mgd. The effluent
measurements tended to be outside  the targeted  20% range. The influent measurements at  0.8 mgd were
fairly stable.  At 0.2 mgd, velocity profiles were more  stable,  although the influent was  outside of the
variability guideline at the surface.
Use of Results
The data collected and verified from this testing is multi-variant and provides a flexible and  detailed set of
information to allow a knowledgeable engineer to design a UV disinfection system  for secondary wastewater
and water reuse applications. The detailed data presented  in the full  report is  a critical  component to
understanding the above summary.
Quality Assurance/Quality Control
NSF  completed a data quality  audit  of at least 10% of the test data  to  ensure that the reported data
represented the  data generated  during testing.   In addition to  QA/QC  audits performed by NSF, EPA
personnel conducted an audit of NSF's QA Management Program.
     Original signed by                                 Original signed by
     Sally Gutierrez	October 2, 2009       Robert Fersuson	October 23, 2009
     Sally Gutierrez                   Date             Robert Ferguson         	Date
     Director                                          Vice President
     National Risk Management Research Laboratory     Water Systems
     Office of Research and Development                NSF International
     United States Environmental Protection Agency
    NOTICE: Verifications are based on an evaluation of technology performance under specific, predetermined
    criteria and the  appropriate quality assurance procedures. EPA and NSF make no  expressed or implied
    warranties as to the performance of the technology and do not certify that a technology  will always operate as
    verified. The end user is solely responsible for complying with any and all applicable federal, state, and local
    requirements.  Mention of corporate  names, trade  names, or commercial products does not constitute
    endorsement or recommendation for use of specific products. This report is not an NSF Certification of the
    specific product mentioned herein.

    REFERENCED DOCUMENTS: The following documents were referenced in this statement:

    USEPA:  Ultraviolet Disinfection Guidance Manual for  the Final Long Term 2 Enhanced Surface Water
    Treatment Rule, EPA-815-R-06-007, 2006. Office of Water, Washington, DC.

    National Water Research Institute (NWRI)/AWWA Research Foundation (AwwaRF): Ultraviolet Disinfection
    Guidelines for Drinking Water and Water Reuse, Second Edition, 2003. Fountain Valley, CA.
09/32/WQPC-SWP      The accompanying notice is an integral part of this verification statement.         September 2009


        Availability of Supporting Documents
        Copies of the Verification Test Plan for the Siemens Water Technologies V-40R-A150 and HE-2E4-
        HO Open Channel UV Systems for Reuse and Secondary Effluent Applications (August 2008), the
        verification statement, and the verification report (NSF Report Number 09/32/WQPC-SWP) are
        available from:
            ETV Water Quality Protection Center Program Manager (hard copy)
            NSF International
            P.O. Box 130140
            Ann Arbor, Michigan 48113-0140
        NSF website: (electronic copy)
        EPA website: (electronic copy)
        Appendices are not included in the verification report, but are available from NSF upon request.
09/32/WQPC-SWP       The accompanying notice is an integral part of this verification statement.          September 2009