Ultrafiltration
UF

Ultrafiltration membrane is a membrane separation technology that can purify and separate solutions. The ultrafiltration membrane system is a solution separation device that uses the ultrafiltration membrane as the filtering medium and the pressure difference on both sides of the membrane as the driving force. The ultrafiltration membrane only allows the penetration of solvents (such as water molecules), inorganic salts, and small organic molecules in the solution, while intercepting the suspended solids, colloids, proteins, and microorganisms in the solution, thus achieving the purpose of purification and separation.
Currently, ultrafiltration membranes are widely used in water treatment engineering. Ultrafiltration technology is playing an increasingly important role in fields such as reverse osmosis pretreatment, drinking water treatment, and reclaimed water reuse. Ultrafiltration technology plays a key role in the sterilization and turbidity removal of alcohol and beverages, the heat source removal of drugs, and the concentration process of food and drugs.
Hollow fiber ultrafiltration membranes are divided into external pressure hollow fiber ultrafiltration membranes and internal pressure hollow fiber ultrafiltration membranes according to their different forms. The main difference between external pressure hollow fiber ultrafiltration membranes and internal pressure hollow fiber ultrafiltration membranes is the different direction of penetration of the permeate.

Introduction
Interception effect
Product parameters
Application area
Internal pressure filtration

The original solution first enters the inner hole of the membrane filament, is driven by pressure difference, and permeates through the hollow fiber radially from the inside out to form the permeate through the internal pressure filtration. Internal pressure filtration can use high-pressure and high-flow flushing to quickly flow through the membrane pore in a tangential direction, thus flushing out pollutants adsorbed on the surface of the membrane pore and restoring the water flux of the membrane.

Interception effect
Retention rate (%) and retention effect of various substances

Colloidal silica

99

Colloidal iron

99

Colloidal aluminum

99

Turbidity

O.1NTU

Suspended solids

100

Microorganism

99.99

SDI

≤3

E. coli

99.99
Product parameters
Limited scope Limited scope

Product water turbidity

<0.1NTU

Temperature tolerance range

5 -45°C

Operating pH range

2-13

turbidity

O.1NTU

Suspended solids

100

Short time residual chlorine tolerance range

2-13

Short time residual chlorine tolerance range

500ppm

operation mode

Internal pressure type

Maximum inlet pressure

0.3MPa

Range of transmembrane pressure difference

<0.15MPa< /p>

Maximum backwash pressure

0.2MPa

Backwash water flux

100-15OL/m2-h

Filtering cycle

30 -60min

Backwash time

3min

Chemical cleaning frequency

30-60 days

Chemical cleaning time

1-2h

Chemical cleaning reagents

Citric acid, sodium hydroxide, sodium hypochlorite

*The flux test condition is pure water at 25 ℃, and the permeability pressure difference is tested at 0.1MPa.

Application field and characteristics

Characteristics and specifications of MEMSOULTM internal pressure ultrafiltration membrane:
The MEMSOULTM internal pressure hollow fiber ultrafiltration membrane uses high-performance polysulfone and polyethersulfone polymers as raw materials for membrane production. Polysulfone and polyethersulfone are widely promoted and applied ultrafiltration membrane materials internationally. This membrane material is expensive, non-toxic and harmless, has excellent stability in use, and long service life. The membrane structure is a double skin finger like structure, with a thin and dense separation layer on the side in contact with the original liquid, and a loose and wedge-shaped structure on the side in contact with the permeate liquid. This type of hollow fiber ultrafiltration membrane has excellent filtration performance and strong pollution resistance, resulting in excellent water quality.

Internal pressure ultrafiltration is mainly used for:
1. Pre treatment of surface water, groundwater, tap water, etc
— lternative clarification tank
— Alternative sand filtration
— RO pre-treatment
2. Treatment of food, beverages, mineral water, rural slightly polluted water, etc

External pressure filtration

The original liquid is driven by pressure difference and permeates through the hollow fiber membrane filament radially from the outside to the inside to become a permeable liquid. When the intercepted substances gather outside the hollow fiber membrane filament, it is subjected to external pressure filtration.

Product parameters
Membrane material PVDF

Nominal membrane aperture

0.03μm

Hollow fiber diameter

0.7mm inner diameter/1.3mm outer diameter

Filtering form

outside-in

Operating mode

Full flow/cross flow filtration

Operating pH range

2- 11/(During chemical cleaning 1-12)

Operating temperature

1- 40°C

Maximum inlet pressure

6bar

Running transmembrane pressure difference

≤2bar

Backwash pressure

≤2.5bar

Flux design range

40-120LMH

Backwash flow range

100-150LMH

Single component air intake

5~12N m3/h

Sodium hypochlorite tolerance

≤2000ppm

*The flux test condition is pure water at 25 ℃, and the permeability pressure difference is tested at 0.1MPa.


Operating parameters

SCP-500n

SCP-700n

film forms

Externally compressed hollow fiber

Externally compressed hollow fiber

membrane

PVDF

PVDF

Shell Material

UPVC

UPVC

Nominal membrane aperture

0.03um

0.03um

Application

Pretreatment before reverse osmosis

Pretreatment before reverse osmosis

Inflow flux range

40-120 LMH

40-120 LMH

Single membrane water production range

2.2-6.7 m3/h

3.0-9.2 m3/h

membrane area

56㎡

77㎡

Turbidity of produced water

≤0.1NTU

≤0.1NTU

Water productionSDI（15min）

≤3

≤3

Maximum inlet pressure

6 bar

6 bar

Weight of membrane components (wet)

85kg

100kg

Range of transmembrane pressure difference

0-2bar

0-2bar

Single component air intake

5-12N m3/h

5-12N m3/h

maximum operating temperature

40℃

40℃

Continuous operation PH range

5-10

5-10

Short time cleaning PH range

1-12

1-12

Sodium hypochlorite tolerance

2000ppm

2000ppm


Application industry

● Power plant boiler makeup water
● Water reuse in coal chemical industry
● Reuse of semiconductor grinding wastewater
● Photovoltaic and photothermal power generation
● Waste incineration power plant
● Standard discharge/reuse of mine water
● General industrial reuse water
● Reuse of printing and dyeing/chemical fiber wastewater
● Municipal/domestic/hospital wastewater reuse
● Fermentation/aquaculture/high concentration organic wastewater treatment
● Coking/electroplating/wastewater reuse


Component characteristics

● Low pollution PVDF membrane reduces cleaning frequency and intensity;
● External pressure filtration process provides balanced inflow flow distribution and solid load, and prevents blockage of hollow fiber membrane fibers
● Special hydrophilic treatment of ultrafiltration membrane PVDF material ensures stronger anti pollution performance than similar products
● High solid tolerance, able to cope with high turbidity impact loads and high doses of flocculants
● The internationally leading third-generation ultrafiltration membrane sponge like grid structure with a nominal 0.03 micron separation layer on the surface ensures safer water quality
● Special sponge like structure membrane filaments with high porosity/high inter pore connectivity/high permeability ensure high and stable ultrafiltration effluent flux
● Excellent antioxidant performance, with a tolerance range of over 2000mg/L to sodium hypochlorite
● Compact membrane components and standardized combination design,Compatible with other external pressure ultrafiltration and microfiltration systems