Ultrafiltration Technology in Chemical Wastewater Treatment
Ultrafiltration technology selectively separates substances through the microporous structure on the surface of the membrane, and uses different pressures on both sides of the membrane to promote filtration.
When the waste liquid reaches the surface of the filtration membrane, the tiny pores on the surface of the membrane will allow water and small molecules to pass through to form new solution, and those substances with relatively large molecules will be blocked by the filter membrane on the other side to form a high-concentration concentrated solution, so that two solutions with different concentrations will be separated.
The performance of ultrafiltration technology has been gradually improved, and the production cost of ultrafiltration membranes has also been greatly reduced, enabling large-scale treatment of wastewater.
Features of ultrafiltration technology
Working principle and application
The working principle of ultrafiltration technology to treat wastewater is that under the pressure, the solution and small molecular substances pass through the micropores on the surface of the filter membrane to reach the other side of the filter membrane, while the macromolecular substances will be blocked and stay on this side.
The principle of physical sieving is the separation of substances.
Macromolecules are blocked mainly in three ways:
1.Adsorption on the surface of the filter membrane and micropores
2.Mechanical sieving on the surface of the filter membrane
3.Being blocked in the micropores.
Because the pore size of the ultrafiltration membrane is very small, even smaller than that of the microfiltration membrane, some particles and molecules with a diameter of less than 10 μm can be separated under the pressure of 0.7~7kg/cm2. The material of ultrafiltration is mainly organic membrane, so it is mainly suitable for the treatment of domestic sewage, oily wastewater, dye wastewater and pulp wastewater.
Solid-liquid Separation in QDEVU
The water filtration efficiency of ultrafiltration (UF) water treatment system is about 250 times that of traditional filtration system, which can be used in pretreatment stage or used to reduce turbidity to maintain the effectiveness of reverse osmosis membrane.
Processes include pre-screening (bag filters or self-cleaning sieve filters), outside-in capillary ultrafiltration modules, automatic air flushing and maintenance cleaning (MC) systems, and CIP systems for periodic recovery cleaning ( RC).
Additional pre- and post-filtration treatment steps can be added as needed to suit feed water conditions and/or treated water quality requirements. Low cost, no pollution residue, convenient operation, high recovery rate.
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