a.
Initial Start-Up. (3-24-22)
i. The Department
shall be notified at least one (1) week in advance of the planned start-up
date. (3-24-22)
ii. The design
engineer shall oversee start-up procedures. (3-24-22)
iii. All monitoring equipment shall be
calibrated prior to start-up. (3-24-22)
iv. The system shall pass direct integrity
testing prior to going on-line and producing water for distribution.
(3-24-22)
v. A method for the
disposal of start-up water shall be approved by the Department prior to
start-up. (3-24-22)
b.
Direct Integrity Testing. (3-24-22)
i. Scale
of Testing. Testing must be conducted on each membrane skid in service at least
daily for the first year of operation. (3-24-22)
ii. Resolution. The test method used must
have a resolution of three (3) gm or less for Cryptosporidium and Giardia
lamblia removal credit. (3-24-22)
iii. Sensitivity. The test method used must
have sensitivity sufficient to verify the ability of the membrane filtration
system to remove the constituent at a level commensurate with the credit
awarded by the Department. (3-24-22)
(1)
Formulae for sensitivity calculation for pressure-based tests are available in
the Membrane Filtration Guidance Manual referenced in Subsection
002.02. The volumetric
concentration factor used in the calculation may be either calculated or
determined experimentally. (3-24-22)
(2) Formulae for sensitivity calculation for
marker-based tests are available in the Membrane Filtration Guidance Manual
referenced in Subsection
002.02.
(3-24-22)
iv. Control
Limit. A control limit must be established within the sensitivity limits of the
direct integrity test that is indicative of an integral membrane unit capable
of achieving the log removal credit awarded by the Department. (3-24-22)
(1) If the direct integrity test results
exceed the control limit for any membrane unit, that unit must be removed from
service. (3-24-22)
(2) Any unit
taken out of service for exceeding a direct integrity test control limit cannot
be returned to service until repairs are confirmed by subsequent direct
integrity test results that are within the control limit.
(3-24-22)
v. Frequency.
Direct integrity testing must be conducted on each membrane unit at a frequency
of at least once per day that the unit is in operation. The Department may
extend testing frequency up to a duration of once per week after one (1) year
of daily testing showing a less than five percent (5%) testing failure rate for
the previous year. During weekly testing, if at any time the system fails more
than two (2) direct integrity tests within a three (3) month period, the system
shall return to daily testing. (3-24-22)
c. Indirect Integrity Monitoring. (3-24-22)
i. Scale of Testing. Testing must be
conducted on each membrane unit in service. (3-24-22)
ii. Monitoring Method. Continuous indirect
integrity monitoring must be conducted using turbidity monitoring unless the
Department approves an alternative method. (3-24-22)
iii. Frequency. Continuous indirect integrity
monitoring must be conducted at a frequency of at least one (1) reading every
fifteen (15) minutes. The Department may allow a time delay in reporting
compliance turbidity measurements if it can be demonstrated that elevated
turbidity readings above fifteen hundredths (0.15) NTU immediately following
direct integrity testing or maintenance are the result of factors related to
entrained air or membrane wettability and are not related to membrane
integrity. (3-24-22)
iv. Control
Limit. If the continuous indirect integrity monitoring results exceed the
specified control limit for any membrane unit for a period greater than fifteen
(15) minutes (i.e., two (2) consecutive readings at fifteen (15) minute
intervals), direct integrity testing must be immediately conducted on that
unit. (3-24-22)
(1) The control limit for
turbidity monitoring is fifteen hundredths (0.15) NTU. (3-24-22)
(2) Control limits for Department approved
alternative methods shall be established by the Department.
(3-24-22)
d.
Operations Plan. A project specific operation and maintenance manual shall be
provided as required in Subsection
501.12. See definition of
Operation and Maintenance Manual in Section
003 for the typical contents of an
operation and maintenance manual and the included operations plan. The
operations plan in the operation and maintenance manual for membrane systems
shall include, but is not limited to the following information: (3-24-22)
i. Filtration: (3-24-22)
(1) Control of feed flow to the membrane
system; (3-24-22)
(2) Measurement
of inlet/outlet pressures and filtrate flows; (3-24-22)
(3) Measurement of transmembrane pressure
changes during filter run; and (3-24-22)
(4) Feed flow control in response to
temperature changes. (3-24-22)
ii. Membrane backwashing: (3-24-22)
(1) Programming automated frequency;
(3-24-22)
(2) Proper backwash
venting and disposal; see Section
540; (3-24-22)
(3) Appropriate backwash rate; and
(3-24-22)
(4) Monitoring during
return of filter to service. (3-24-22)
iii. Chemical cleaning: (3-24-22)
(1) Selection of proper chemical washing
sequence; (3-24-22)
(2) Proper
procedures for dilution of chemicals; (3-24-22)
(3) Monitoring of pH through chemical
cleaning cycle; (3-24-22)
(4)
Rinsing of membrane system following chemical clean; and (3-24-22)
(5) Return of filter to service.
(3-24-22)
iv. Chemical
feeders (in the case that chemical pretreatment is applied): (3-24-22)
(1) Calibration check; (3-24-22)
(2) Settings and adjustments (how they should
be made); and (3-24-22)
(3)
Dilution of chemicals and polymers (proper procedures).
(3-24-22)
v. Monitoring
and observing operation: (3-24-22)
(1)
Observation of feed water or pretreated water turbidity; (3-24-22)
(2) Observation of trans-membrane pressure
increase between backwashes; (3-24-22)
(3) Filtered water turbidity;
(3-24-22)
(4) Procedures to follow
if turbidity breakthrough occurs. (3-24-22)
vi. Troubleshooting. A troubleshooting
checklist or guide shall be included. Suggested troubleshooting items include
but are not limited to the following: (3-24-22)
(1) No raw water (feed water) flow to plant;
(3-24-22)
(2) Can't control rate of
flow of water through equipment; (3-24-22)
(3) Valving configuration for direct flow and
cross-flow operation modes; (3-24-22)
(4) Poor raw water quality (raw water quality
falls outside the performance range of the equipment); (3-24-22)
(5) Poor filtrate quality;
(3-24-22)
(6) Failed membrane
integrity test; (3-24-22)
(7) Low
pump feed pressure; (3-24-22)
(8)
Automatic operation (if provided) not functioning; (3-24-22)
(9) Filtered water turbidity too high;
(3-24-22)
(10) Head loss builds up
excessively rapidly; (3-24-22)
(11)
Reduced flux; (3-24-22)
(12)
Machine will not start and "Power On" indicator off; (3-24-22)
(13) Machine will not start and "Power On"
indicator on; (3-24-22)
(14) Pump
cavitation; (3-24-22)
(15) Valve
stuck or won't operate; and (3-24-22)
(16) No electric power.
(3-24-22)
e.
Reporting. The sensitivity, resolution, and frequency of the direct integrity
test proposed for use with the full-scale facility must be reported to the
Department prior to initial operation. The following shall be reported to the
Department on a monthly basis: (3-24-22)
i.
Any direct integrity test results exceeding the control limit, as well as the
corrective action taken in response, must be reported to the Department within
ten (10) days of the end of the monthly monitoring cycle on a Department
reporting form. The form is available at
www.deq.idaho.gov; (3-24-22)
ii. Any continuous indirect integrity
monitoring results triggering direct integrity testing, as well as any
corrective action taken in response, must be reported to the Department within
ten (10) days of the end of the monthly monitoring cycle on a Department
reporting form. The form is available at
www.deq.idaho.gov; (3-24-22)
iii. Any additional information considered
necessary by the Department on a case-specific basis to verify proper operation
and maintenance of the membrane filtration process; and (3-24-22)
iv. All direct integrity test results and
continuous indirect integrity monitoring results must be retained for a minimum
of three (3) years. (3-24-22)