PES Session 3

What are the disadvantage to have pretreatment before UF ?

• reduction of SS and some dissolved water parameters

• compensation of seasonal peaks

• well defined design parameters

• WE SELL LESS MEMBRANE!

What does this permeability chart tell us ?

• significant decline in permeability after 12 months of operation

• stable permeability supported by inline coagulation with efficient BW + CEB

For PES inside-out membrane, Coagulation is a must for the the followings, except

• surface water

• well water

• seawater

• wastewater

Greensand can be applied to remove ( select best answer)

• Ca , Ar

• Ar, Mn, Fe

• Ar, Mn

• Ca , Mn

What is / are the advantage(s) of direct coupling UF and RO ?

• compact footprint

• Smaller tank required for BW

• Lower power consumption

• all above

Theoretically minimum ___(A)___ trains are required for direct coupling UF-RO. But preferably to have __ (B) _ trains in real application .

• A= 2

  B= 3

• A= 2

  B= 4

• A= 3

  B= 5

• A= 3

  B= 8

which option is preferred when designing UF-RO direct coupling ?

• Option A

• Option B

for drinking water application where NSF is required , i can propose MB PRO 95 now. Select the best answer

• Why not

• NEVER

• Have to wait for NSF certification

Turbidity has great impact on the PES UF permeability .

Select best answer based on your understanding.

• correct.

  when NTU is high for long run, permeability and turbidity will be lousy

• Not true.

  So long coagulation , BW+CEB is efficient, impact is minimum.

Match the prefilter size recommended for
(A) city /surface/wastewater

(B) Seawater

C) borewell water with sand (Hmemcor)

• (A) <200um

  (B) <200um

  (C) <200um

• (A) <300um

  (B) <150um

  (C) <100um

• (A) <300um

  (B) <150um

  (C) <200um

• (A) <200um

  (B) <150um

  (C) <100um