Reverse Osmosis

Which of the following membrane systems has the smallest pore size?
1. Microfiltration (MF)
2. Ultrafiltration (UF)
3. Nanofiltration (NF)
4. Reverse Osmosis (RO)
What is the term used to describe the filtered water from a membrane treatment process?
1. Permeate
2. Concentrate
3. Reject
4. Flux
Which flow pattern within a membrane system assists in minimizing fouling?
1. Dead end flow
2. Cross flow
3. Inside out
4. Outside in
What does the term molecular weight cutoff (MWCO) describe?
1. The overall weight of a membrane unit
2. The individual fiber weight of a membrane
3. The maximum weight that can be supported by the membrane surface
4. The smallest molecule retained by the membrane.
What is the term used to describe the water flow through a membrane system?
1. Permeate
2. Reject
3. Flux
4. Flow through filtration
What is meant by using a multi barrier approach to ensure safe potable water?
1. Several layers of membranes
2. Difficult government regulations
3. Regulatory oversight by multiple government agencies
4. Several layers of treatment to ensure safe potable water
Which membrane system is an excellent solution to utilities that are experiencing disinfection byproduct (DBP) compliance issues?
1. Reverse Osmosis (RO)
2. Nanofiltration (NF)
3. Ultrafiltration (UF)
4. Cartridge filtration (CF)
What is the process that causes the flow of solvent through a semi-permeable membrane, from a dilute solution to a concentrated solution?
1. Reverse Osmosis
2. Osmosis
3. Polarization
4. Pressure equalization
What can happen if Operators over concentrate the brine in an RO system?
1. Concentration Polarization
2. Seal rupture at element
3. Clog permeate discharge valve
4. Excessive backpressure at feed pump
Which membrane integrity test detects a rise in turbulence in the module when there is a fiber failure?
1. Particle counting
2. Air pressure testing
3. Bubble point testing
4. Sonic wave sensing
Which membrane configuration uses bundles of tiny, hair-like membrane tubes?
1. Hollow fiber
2. Thick Plate
3. Composite Plate
4. Spiral wound
What can be used prior to the membrane system in an attempt to remove turbidity from highly turbid waters?
1. Ozone
2. Chlorine
3. Coagulants and filter cartridges
4. Chlorine dioxide
What test is frequently used to determine the tendency to precipitate calcium carbonate in the RO process?
1. Langelier Index
2. Marble test
3. Calcium Column
4. Silt Density Index
What type of acid is commonly used to remove dissolve inorganic scaling from an RO unit?
1. Citric acid
2. Nitric acid
3. Sulfuric acid
4. Acids are not used, bases are
What must you always do when restarting a RO system that has been shut down for an extended period of time?
1. Remove all traces of the chlorine or bactericide that was used during the prolonged shutdown
2. Pre rinse the unit with a low dose acid solution to increase permeability
3. Reverse the feed flow rate to remove any precipitates that may have formed on the membrane surface
4. Increase the feed water pump by 150% to achieve the “initial push” through the membranes
What is the process of chemical cleaning while the membrane modules remain within the membrane unit?
1. Dip and Rinse (D&R)
2. Extended soak (ES)
3. Clean and rinse (CR)
4. Clean in place (CIP)
What specific test is used to confirm water quality as it relates to avoiding and controlling fouling?
1. The Silt Density Index (SDI)
2. Langelier index
3. Millipore test
4. Marble test
What is the more common membrane configuration used in drinking water?
1. Hollow fiber
2. Thick Plate
3. Composite Plate
4. Spiral wound
Which membranes are also referred to as “softening membranes?”
1. Reverse Osmosis (RO)
2. Nano filtration (NF)
3. Ultra filtration (UF)
4. Micro filtration (MF)
Which membrane process is currently being used instead of conventional granular media filtration?
1. Reverse Osmosis (RO)
2. Nano filtration (NF)
3. Ultrafiltration (UF)
4. Cartridge filtration (CF)

Reverse Osmosis

Quiz