RO Sharing Session

Match the filtration operating mode

• A is Dead End ; B is cross flow

• A is Cross flow ; B is dead end

What do you observe ?

• Tail element has the same feed pressure as lead element

• Lead and Tail element is treating the same amount of salt (TDS) in feed

• Permeate quality produced by each element is the same

• Permeate flow produced is dropping across the PV

What are the function of RO ?

• Remove contaminants

• Remove minerals

• Remove ions / dissolved salt

• all the above

What can be the feed source for RO process ?

• Wastewater treatment plant secondary treatment effluent

• saline water

• brackish water/Municipal /City water/ Tap water

• all the above

• 1

• 1.81

• 2

• 4

What is best choice of RO membrane ?

• As high salt rejection as possible

• Permeability as high as possible

• Balance between salt rejection and permeability

Which of the following will affect RO performance ? (Select the best answer)

• Feed Pressure, Temperature, Feed TDS and pH, Recovery

• Feed TDS, Temperature , Recovery, pH

• Feed TDS , Feed Pressure, Recovery

• Feed Pressure , Recovery, Temperature

select the correct answer

• (1) maintain (2) reduce (3) reduce

• (1) increase (2) increase (3) reduce (flow increase > SP increase )

• (1) increase (2) maintain (3) reduce

Both permeate flow & salt passage increase when T increases.What's the NET effect in permeate quality when T increases?

• Better (as permeate flow increase helps to dilute salt in permeate)

• remain same

• Poorer (as increase in SP > increase in permeate flow)

One day, feed SW TDS is 35,000ppm, instead of design 30,000ppm. Which is WRONG for SWRO ?

• Recovery reduce

• Poorer permeate quality

• Higher operating pressure (higher osmotic P, thus, higher NDP)