Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1.
Scope.
This part establishes the requirements for registering
bacteriological reduction processes.
Subp. 2.
Verification.
Manufacturers shall, for the purpose of product registration
as described in parts
7083.4000 to
7083.4040 for meeting treatment
level A or B, verify bacteriological reduction performance by sampling and
testing for fecal coliform.
Subp.
3.
Testing process.
All test data submitted for product registration must be
produced by a qualified, third-party testing organization. Bacteriological
reduction performance requirements must be determined while the treatment
product or sequence is tested according to the NSF Standard 40 testing
protocol, or other equivalent commissioner-approved testing protocol. The
tester must:
A. collect samples from
both the influent and effluent streams and identify the treatment performance
achieved by the full treatment process, component, or sequence;
B. obtain influent characteristics within the
range of 106 - 108 fecal
coliform/100 mL calculated as 30-day geometric means during the test;
C. test the influent to any disinfection unit
and report flow rate, pH, temperature, and turbidity at each occasion of
sampling performed in item D;
D.
obtain samples for fecal coliform analysis during both design loading and
stress loading periods, as follows:
(1) grab
samples shall be collected and analyzed from both the influent and effluent on
three separate days of the week; and
(2) each set of influent and effluent grab
samples must be taken from a different dosing time frame (morning, afternoon,
or evening) so that samples have been taken from each dosing time frame by the
end of the week;
E.
conduct analyses for fecal coliform according to Standard Methods for the
Examination of Water and Wastewater, prepared and published jointly by the
American Public Health Association, American Water Works Association, and Water
Environment Federation (1998). The standard methods are incorporated by
reference, are available through the Minitex interlibrary loan system, and are
subject to frequent change;
F.
report the geometric mean of fecal coliform test results from all samples taken
within 30-day or monthly calendar periods;
G. report the individual results of all
samples taken throughout the test period for design loading and stress loading;
and
H. report all maintenance and
servicing conducted during the testing period, such as instances of cleaning an
ultraviolet lamp or replenishment of chlorine chemicals.
Subp. 4.
Disinfection.
Manufacturers are allowed to register products that:
A. meet the bacteriological testing
requirements alone, without the need for a separate disinfection device to meet
treatment level A or B;
B. meet the
bacteriological testing requirements when tested with a compatible secondary
disinfection device as a component of the process to meet treatment level A or
B; or
C. meet the bacteriological
testing requirements when coupled with a compatible secondary disinfection
device that meets bacteriological requirements of this part as a component of
the process to meet treatment level A or B.
