Ultrafiltration is a membrane separation technology between nanofiltration and microfiltration. Ultrafiltration uses a pressure-activated membrane to trap colloids, particles and relatively high molecular weight substances in water under the action of external forces (pressure), while water molecules and small solute particles pass through the membrane separation process. Substances with molecular weight of 500 -- 500000 daltons can be intercepted by screening micropores on the membrane surface. When the treated water passes through the membrane surface at a certain velocity with the help of external pressure, water molecules and solutes with molecular weight less than 300-500 pass through the membrane, while particles and macromolecules larger than the membrane hole are intercepted due to the screening effect, so as to purify the water.
Equipment overview:
Ultrafiltration is a membrane separation technology between nanofiltration and microfiltration. Ultrafiltration uses a pressure-activated membrane to trap colloids, particles and relatively high molecular weight substances in water under the action of external forces (pressure), while water molecules and small solute particles pass through the membrane separation process. Substances with molecular weight of 500 -- 500000 daltons can be intercepted by screening micropores on the membrane surface. When the treated water passes through the membrane surface at a certain velocity with the help of external pressure, water molecules and solutes with molecular weight less than 300-500 pass through the membrane, while particles and macromolecules larger than the membrane hole are intercepted due to the screening effect, so as to purify the water. That is to say, when the water passes through the ultrafiltration membrane, most of the colloidal silicon contained in the water can be removed, and a large number of organic matter can be removed, so as to achieve the purpose of purification, separation and concentration of the original solution.
Ultrafiltration device: mainly plate and frame type ultrafiltration device, tube type ultrafiltration device, roll type ultrafiltration device, hollow fiber type ultrafiltration device. At present, the mature product process is mainly hollow fiber ultrafiltration device, which is widely used in reverse osmosis pretreatment, reclaimed water reuse and wastewater treatment projects.
In addition to the body equipment, the ultrafiltration device system should also be equipped with backwash device, backwash dosing device and cleaning device to ensure the normal maintenance and prolong the service life of the ultrafiltration device.
Main features:
The separation process does not occur phase change, the driving force is low pressure pump, energy consumption is small;
Separation process can be carried out at room temperature, can be suitable for some heat sensitive substances;
The equipment and process are simple, easy to operate, manage and maintain;
The maximum effective membrane area per unit volume, the highest working efficiency, small footprint.
Operating conditions:
Inlet water temperature: 10-60℃
Inlet pH: 2-11
Operating pressure: 0.11 ~ 0.6Mpa
Inlet turbidity: < 10NTU
Inlet TSS: < 20mg/L
Influent COD (GR method) : < 30mg/L (O2)
Scope of application:
It is suitable for further purification of water containing suspension and low impurity (turbidity less than 2-5 degrees). Widely used in industrial water treatment, municipal drinking water engineering, beverage, brewing, biological pharmaceutical and other industries.
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