What different RO system and UF system?
There is no water tank, waste water, and electricity in the UF Water Filtration System.
In a reverse osmosis system, raw milk is pumped into a semi-permeable membrane. The membrane has a very small pore size that will only allow the water to continue through the system. The pressure added to the inlet side is raised above the osmotic pressure; this forces the water through the membrane (Wichell and Hammond,1984). Osmotic pressure is the minimum amount of pressure desired to stop osmosis. In reverse osmosis and nanofiltration, the largest amounts of pressure were observed.
This was due to the small pore size of the semipermeable membrane. The osmotic pressure in RO or NF was high compared to MF or UF. The pressure applied must exceed the osmotic pressure (Pouliot, 2008).
In an ultrafiltration system, the process was much like that of RO. The main difference was pore size UF was larger than RO. Being that UF had larger pores, it allowed for more than just water to pass through. The permeate of UF milk consists of water, soluble salts, lactose and soluble nonprotein nitrogen (Kosikowski, 1973). The osmotic pressure will be lower than that of RO or NF. This was because the larger pore size in UF allowed for the fluid to flow easier through the membrane.
UF is ideal for the removal of colloids, proteins, bacteria, pyrogens, and macromolecules larger than the membrane pore size from water. The primary removal mechanism is size exclusion, though surface chemistry of the particles or the membrane may affect the purification efficiency. UF can be used as pretreatment for reverse osmosis systems or as a final filtration stage for deionized water.