Lync WQ-RS
SECTION 1: INTRODUCTION
L- OMM-005_A
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2/23/2022
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Prefilter Cartridge
- Used to remove smaller suspended solids and trap any particles that may
be generated by the other pretreatment. The cartridge(s) should be replaced when the pressure
drop across the housing increases 5 - 10 psig over the clean cartridge pressure drop. The effect
of suspended solids is measured by the silt density index (SDI) test. An SDI of five (5) or less is
specified by most mem- brane manufacturers and three (3) or less is recommended.
Iron & Manganese
- Iron should be removed to less than 0.1 ppm. Manganese should be
removed to less than 0.05 ppm. Special media filters and/or chemical treatment is commonly
used.
pH
- The pH is often lowered to reduce the scaling potential.
Silica: Reported on the analysis as SiO2. Silica forms a coating on membrane surfaces when
the concentration exceeds its solubility. Additionally, the solubility is highly pH and temperature
dependent. Silica fouling can be prevented with chemical injection and/or reducing the recovery.