Membrane and Desalination Technologies - TCE Moodle Website

Membrane Filtration Regulations and Determination of Log Removal Value 185
Table 4.13
Summary of requirements of continuous indirect integrity monitoring (Source: US EPA)
Topic Requirement synopsis
Scale of testing Monitoring must be conducted separately on each membrane unit (i.e., rack, skid,
etc.) in service
Monitoring
method
Continuous indirect integrity monitoring must be conducted using turbidity
monitoring unless the state approves an alternative method
Frequency Continuous indirect integrity monitoring must be conducted at a frequency of at least
one reading every 15 min
Control limit If the continuous indirect integrity monitoring results exceed the specified control
limit for any membrane unit for a period greater than 15 min (i.e., two consecutive
readings at 15-min intervals), direct integrity testing must be immediately
conducted on that unit
The control limit for turbidity monitoring is 0.15 NTU
Control limits for state-approved alternative methods must be established
by the state
Reporting Any continuous indirect integrity monitoring results triggering direct integrity
testing, as well as any corrective action taken in response, must be reported to the
state within 10 days of the end of the monthly monitoring cycle
All continuous indirect integrity monitoring results must be retained for a minimum
of 3 years
Qp ¼ ð85LmhÞ100m2
60 min =h
Qp ¼ 142L=min:
Therefore, the required test solution volume can be calculated as follows:
Vtest ¼ ð142L=min 30min þ 200L þ 600LÞ
1:2;
Vtest ¼ 6; 070L:
Step 2: Determine feed challenge particulate concentration within the bounds established by
Eqs. 4 and 5.
Minimum feed concentration:
Cf min ¼ 10 LRVtDL; From ð5Þ (5Þ
where LRV t = 4 log (from given information), DL = 1 particles per 500 mL (from given
information), DL = 2 particles per L
Cf min ¼ 10 4
2 particles=L;
Cf min ¼ 2 10 4 particles=L: