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Main process flow of reverse osmosis equipment

Dec 04, 2019

  1. Raw water tank (optional) reverse osmosis equipment process map (click to enlarge)

Store raw water for sedimentation of large sediment particles and other precipitable substances in water. At the same time, it buffers the impact of water pressure instability on the water treatment system in the raw water pipe. (such as pressure sensing reaction caused by low or too high water pressure).

  2. Original water pump

Constant system water supply pressure, stable water supply.

3. Multi-media filter

The filter with multiple filtration layers is mainly used to remove the sediment, rust, colloidal substances, suspended solids and other particles containing more than 20um in the raw water. It can be backwashed by manual valve control or fully automatic controller. Flush and other operations. Ensure the water quality of the equipment and extend the service life of the equipment.

4. Activated carbon filter

The system uses a shell-shell activated carbon filter. The activated carbon not only adsorbs electrolyte ions, but also performs ion exchange adsorption. The adsorption of activated carbon can also reduce the oxygen consumption (COD) of potassium permanganate from 15mg/L (O2) to 2-7mg/L (O2). In addition, due to the adsorption, the concentration of adsorbed and replicated surface increases. It acts as a catalyst, removes pigments, odors, large amounts of biochemical organic matter, reduces residual chlorine values of pesticides, and removes trihalides (THM) and other contaminants from water. Manual valve control or fully automatic controller can be used for backwashing, flushing and other operations. Ensure the water quality of the equipment and extend the service life of the equipment. At the same time, the equipment has a self-maintenance system and the operating costs are low.

5. Ion softening system / dosing system

In order to dissolve the concentrated discharge of solid matter and the utilization of fresh water, the R/O device prevents the concentration of CaCO3, MgCO3, MgSO4, CaSO4, BaSO4, SrSO4, SiSO4 on the concentrated water side of the concentrated membrane end, especially the RO unit. The product is larger than its equilibrium solubility constant and crystallizes out, damaging the proper characteristics of the original film. Before entering the reverse osmosis membrane module, the ion softening device or an appropriate amount of scale inhibitor should be used to prevent the precipitation of carbonate, SiO2 and sulfate crystals. .

6. Precision filter

The use of precision filters to remove suspended solids, non-straight particles and colloids in the influent water makes the subsequent operations of the RO system safer and more reliable. The filter element is a 5um meltblown filter element, the purpose of which is to remove impurities larger than 5um which are leaked from the upper filter unit. Preventing it from entering the reverse osmosis device damages the surface of the membrane, thereby damaging the desalination performance of the membrane.

7. Reverse osmosis system

The reverse osmosis device separates the solvent (usually water) in the solution through a reverse osmosis membrane (or semi-permeable membrane) with sufficient pressure. This process is called reverse osmosis because it is opposite to the direction of natural permeation. The reverse osmosis method can adapt to all kinds of raw water with salt content, especially in the high-salt water treatment project, it can obtain good technical and economic benefits. The reverse osmosis method has high salt rejection rate, high recovery rate, stable operation, small floor space and simple operation. The reverse osmosis equipment removes most bacteria, colloids and large molecular weight organic substances while removing salt.

  8. Ozone sterilizer / UV sterilizer (optional)

Kill the bacteria caused by secondary pollution to completely ensure the hygiene index of the finished water.

Generally include raw water pumps, dosing devices, quartz sand filters, activated carbon filters, precision filters, etc. Its main role is to reduce the pollution index of raw water and other impurities such as residual chlorine to meet the requirements of reverse osmosis. The equipment configuration of the pretreatment system should be based on the specific conditions of the raw water. It generally includes the original water pump, dosing device, quartz sand filter, activated carbon filter, precision filter and so on. Its main role is to reduce the pollution index of raw water and other impurities such as residual chlorine to meet the requirements of reverse osmosis. The equipment configuration of the pretreatment system should be based on the specific conditions of the raw water.

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