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Summary Of 6 Major Categories Of Commonly Used Membrane Treatment Technologies(2))

Author: Site Editor     Publish Time: 2022-08-26      Origin: Site


Ⅳ. Reverse osmosis (RO) membrane technology

1. Reverse osmosis (RO) principle

Reverse osmosis is a pressure driven membrane separation process in use to produce reverse osmosis pressure needs to be pumped to saline solution or wastewater pressure to overcome the natural osmotic pressure and membrane resistance to make water through the reverse osmosis membrane, the dissolved salt or contaminants in the water to prevent the other side of the reverse osmosis membrane.

2. Reverse osmosis membrane in the application of water treatment

(1) in the water treatment of conventional applications

Water is an essential material condition for people to survive and carry out production activities. Due to the increasing lack of fresh water resources, the world's reverse osmosis water treatment device capacity has reached millions of tons per day.

(2) Applications in municipal wastewater

At present, the application of reverse osmosis membrane in the deep treatment of urban sewage, especially the secondary effluent reuse and water reuse in sewage treatment plants, has been highly regarded.

Ⅴ. Dialysis membrane technology

1. Dialysis membrane technology principle

Dialysis (Dialysis, D for short) is the process of solute transfer from the upstream of the membrane to the downstream of the membrane, under the effect of its own concentration gradient.

2. Application of Dialysis Membrane

Dialysis was the first membrane separation technology discovered and studied, but because of the limitations of its own system, the dialysis process is slow and inefficient, and the selectivity of the dialysis process is not high, so the dialysis process is mainly used to remove low molecular weight components from solutions containing a variety of solutes, such as haemodialysis, i.e. using dialysis membranes instead of kidneys to remove toxic low molecular weight components such as urea, creatinine, phosphate and uric acid to relieve patients with renal failure and uremia.

Ⅵ. Positive Osmosis (FO) technology

1. Principle of ortho-osmosis (FO)

The solvent and solution are separated by a semi-permeable membrane that can only pass through the solvent but not the solute molecules, and the solvent molecules will spontaneously pass through the membrane from the solvent side into the solution side under the action of osmotic pressure, which is the phenomenon of osmosis, also known as "forward osmosis.

2. Positive osmosis membrane in the application of water treatment

In the FO system, similar to RO, the water molecules in the raw liquid permeate through the semi-permeable membrane to the permeate side of the membrane, trapping the salt solution on the other side of the membrane. Therefore the use of FO as a desalination process and method has been the focus of research by researchers, and there are now a number of patents.

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