Maximum Feed Concentration = 1 x 104 x (Filtrate Detection Limit)
LRV = LOG10(Cf)-LOG10(Cp)
Where:
LRV = log removal value demonstrated during challenge testing; Cf= the feed concentration measured during the challenge test; and Cp= the filtrate concentration measured during the challenge test. In applying this equation, the same units shall be used for the feed and filtrate concentrations. If the challenge particulate is not detected in the filtrate, then the term Cp shall be set equal to the detection limit.
Maximum Feed Concentration = 3.16 x 106 x (Filtrate Detection Limit)
LRV = LOG10(Cf) - LOG10(Cp)
Where:
LRV = log removal value demonstrated during the challenge test; Cf = the feed concentration measured during the challenge test; and Cp= the filtrate concentration measured during the challenge test. Equivalent units shall be used for the feed and filtrate concentrations. If the challenge particulate is not detected in the filtrate, the term Cp is set equal to the detection limit for the purpose of calculating the LRV. An LRV shall be calculated for each membrane module evaluated during the challenge test.
LRVDIT= LOG10(Qp/(VCF x Qbreach))
Where:
LRVDIT= the sensitivity of the direct integrity test; Qp= total design filtrate flow from the membrane unit; Qbreach= flow of water from an integrity breach associated with the smallest integrity test response that can be reliably measured, and VCF = volumetric concentration factor. The volumetric concentration factor is the ratio of the suspended solids concentration on the high pressure side of the membrane relative to that in the feed water.
LRVDIT= LOG10(Cf)-LOG10(Cp)
Where:
LRVDIT= the sensitivity of the direct integrity test; Cf= the typical feed concentration of the marker used in the test; and Cp= the filtrate concentration of the marker from an integral membrane unit.
Wis. Admin. Code Department of Natural Resources NR 810.45