Ultrafiltration Membrane (UF)

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Ultrafiltration Membrane (UF)

Ultrafiltration (UF) is a separation principle for screening, with pressure as the driving force to realize mechanical separation membrane separation process , namely under certain pressure , when the mixed solution of large molecules or a small molecule solute through the membrane surface, solvent (e.g., inorganic salt) and small molecule solutes through the membrane, and the solute molecules due to mechanical filtration membrane as concentrate intercept. To achieve the purpose of purification, separation and concentration.

Hollow fiber ultrafiltration membrane is an important form of separation membrane . The membrane pores are capillary , and the micropores are located on the wall of the tube. The solution is based on whether its components can be purified, separated and concentrated through these micropores.Among the membrane components per unit volume, hollow fiber membrane has the largest effective area , high filtration and separation efficiency , easy cleaning , simple structure , easy operation and low price .The production process does not produce secondary pollution, so it is widely used.

Operating Parameters

Material	PES		PVDF	PAN
Module	(Inside-out)	(Inside-out)	(Outside-in)	(Inside-out)
Membrane diameter ID/OD(mm)	1.0/1.6	0.7/1.3	0.7/1.3	1.4/2.2
Maximum Feed turbidity	<50NTU		<100NTU	<80NTU
Maximum chlorine resistance	continuously 50ppm Instantaneously 500ppm		continuously 200ppm Instantaneously 2000ppm	continuously 5ppm Instantaneously 100ppm
Temperature range	2-10		2-12	2-10
PH range	5-45 ℃
Operation module	Cross flow or dead-end
Maximum permeate Flux	120L/m²·h		150L/m²·h	150L/m²·h
Maximum Feed pressure	0.5 MPa
Maximum trans membrane pressure	0.2 MPa
Maximum Back wash pressure	0.25 MPa
Back wash frequency	15-60 min
Back wash duration	30-60 sec
Back wash flux	100-360 L/m²·h
Chemical enhanced backwash (CEB) frequency	1-15 day
Chemical enhanced backwash (CEB) duration	1-10 min
Chemical cleaning frequency	30-180 day
Chemical cleaning duration	90-480 min
Chemical cleaning chemicals	NaClO Or H2O2 (500ppm), NaOH（pH≤12）, HCl（pH≥2)		NaClO Or H2O2 (2000ppm), NaOH（pH≤10）, HCl（pH≥2）	NaClO Or H2O 2 (100ppm), NaOH（pH≤10）, HCl（pH≥2）

External pressure VS Internal pressure

External pressure(outside-in)

he original liquid is driven by the pressure difference , penetrates radially from the outside to the inside, through the hollow fiber to become the osmotic fluid, and the trapped concentrated material is collected in the outside of the hollow

Internal pressure（in-outside）

The original solution into the hollow fiber membrane, driven by the pressure difference, radial from inside to outside through the hollow fiber into osmotic fluid, concentrated liquid is left in the hollow fiber, from the other end out.