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Vliya Pretreatment System For Water Treatment - China

price: contact company for price

Pretreatment is important when working with reverse osmosis and

nanofiltration membranes due to the nature of their spiral- wound

design. The material is engineered in such a fashion as to allow only

one- way flow through the system. As such, the spiral- wound design does

not allow for backpulsing with water or air agitation to scour its

surface and remove solids. Since accumulated material cannot be removed

from the membrane surface systems, they are highly susceptible to

fouling ( loss of production capacity) . Therefore, pretreatment is a

necessity for any reverse osmosis or nanofiltration system.

1. Screening of solids: Solids within the water must be removed and the water treated to prevent fouling of the membranes by fine particle or biological growth, and reduce the risk of damage to high- pressure pump components.

2. Cartridge filtration: Generally, string- wound polypropylene filters are used to remove particles of 1–5 µm diameter.

3. Dosing: Oxidizing biocides, such as chlorine, are added to kill bacteria, followed by bisulfite dosing to deactivate the chlorine, which can destroy a thin- film composite membrane. There are also biofouling inhibitors, which do not kill bacteria, but simply prevent them from growing slime on the membrane surface and plant walls.

4. Prefiltration pH adjustment: If the pH, hardness and the alkalinity in the feedwater result in a scaling tendency when they are concentrated in the reject stream, acid is dosed to maintain carbonates in their soluble carbonic acid form.

CO 32− + H 3O + = HCO 3− + H 2O

HCO 3− + H 3O + = H 2CO 3 + H 2O

5. Carbonic acid cannot combine with calcium to form calcium carbonate scale. Calcium carbonate scaling tendency is estimated using the Langelier saturation index. Adding too much sulfuric acid to control carbonate scales may result in calcium sulfate, barium sulfate, or strontium sulfate scale formation on the reverse osmosis membrane.


Company Contact:


  • Phone: 8615820261538

  • Address: Wanjiang Dongguan City Guangdong Province China, Dongguan, China

  • Email: Email


Published date: January 15, 2016 -

  • Business Description: RO system pure water machine, CEDI deionized ultrapure water treatment machine, Ion exchanger, UF system, Water filter, Wastewater treatment machine, Water reuse treatment system, Seawater desalination system, Purification water treatment machine, Water tanks, ect.

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