분야
pptx2.Materials For RO Membrane
3.CA Membrane
4.Advantages & Disadvantages
5.PA Membrane
6.Production of PA Membrane
7.Advantages & Disadvantages
8.The key point of the RO membrane
9.Fouling
10.Permeability & Energy consumption
11.State of the art R.O. Tech
12.Material improvement
13.mixed matrix materials
-R.O membrane type (Bang, junho)
-Property, affecting factor (Park, minoh)
-State of the art R.O membrane (Yoon, sehyun)
Advantages & Disadvantages
Stable performance in applications
Relatively low cost
Narrow operating pH range
Susceptibility to biological attack
Structural compaction
Under high pressure and low upper temperature limit
Advantages & Disadvantages
Superior water flux
Superior salt and organic rejections
Pressure compaction resistance
Wider operating temperature range (0 C–45 C) and pH range (from 1 to 11)
Higher stability to biological attack
Chlorine and fouling susceptibility
The key point of the RO membrane
Flux
Salt rejection
※ Problems
- fouling
- permeability
- energy consumption
Fouling
Main cause
- algae, microorganism, cationic foulants.
- We should replace the reverse osmosis membrane periodically.
Decrease the water flux
Increase the energy consumption, and desalination costs
Permeability & Energy consumption
If permeability is a high value, membrane area is decreasing.
It can decrease the costs of the desalination.
The thermodynamics limit of about 0.52kWh/
Objective
-Fouling and Scaling effect
-Salt rejection
-Energy consumption
※focus on Material and structural effect
1.Material improvement
-Chlorine endurable R.O
-CNT
-Current materials
2.Structure modification
-mixed matrix materials
-Modified Thin barrier film
1) Chlorine endurable R.O
-chlorine
-poly-sulfone
2)CNT
-smooth, hydrophobic → (fast water transport)
-channel size
