Reverse Osmosis Water Treatment Plant Water Purification System

What is RO Water Treatment System?

Reverse osmosis, also known as ro water treatment system, is a membrane separation operation driven by pressure difference to separate the solvent from the solution. Pressure is applied to the material liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent will reverse osmosis against the direction of natural osmosis. Thus in the low pressure side of the membrane to get through the solvent, that is, osmotic liquid; The high-pressure side yields a concentrated solution, known as concentrate. If seawater is treated by reverse osmosis, fresh water is obtained at the low pressure side of the membrane and brine is obtained at the high pressure side.

Because ro water treatment system is opposite to the direction of natural infiltration, it is called reverse osmosis. According to the different osmotic pressure of various materials, reverse osmosis pressure greater than osmotic pressure can be used, that is, reverse osmosis method, to achieve the purpose of separation, extraction, purification and concentration.

Technical parameters of RO Water Treatment System

Basic Principle of RO Water Treatment System

The same volume of dilute solution (e.g., water) and thick liquid (such as sea water or salt water), respectively, on both sides of the container, separated by a semipermeable membrane, dilute solution of the solvent nature through a semipermeable membrane, flowing the concentrated solution side, the side of the strong solution liquid level than the dilute solution of liquid level above a certain height, and form a pressure difference, achieve osmotic balance state, this pressure difference is the osmotic pressure, The osmotic pressure depends on the type, concentration and temperature of the concentrated solution, and is independent of the properties of the semi-permeable membrane. If a pressure greater than osmotic pressure is applied on the side of the concentrated solution, the solvent in the concentrated solution will flow to the dilute solution, and the flow direction of the solvent is opposite to the direction of the original infiltration. This process is called reverse osmosis.

Process Flow of RO Water Treatment System

Raw water → original water tank → original water pump → multi-media filter (quartz sand filter)→ activated carbon filter → soft water processor → precision filter → high pressure pump → first stage reverse osmosis (RO) device → pure water tank → high pressure pump → second stage reverse osmosis → ultraviolet sterilization device → water point

Reverse osmosis water treatment system generally includes pretreatment system, reverse osmosis device, post-treatment system, cleaning system and electrical control system:

1, the pretreatment system generally includes the original water pump, dosing device, quartz sand filter, activated carbon filter, precision filter, etc. Its main function is to reduce the pollution index of raw water and other impurities such as residual chlorine to meet the requirements of reverse osmosis inlet water.

2. Reverse osmosis device mainly consists of multistage high pressure pump, reverse osmosis membrane element, membrane shell (pressure vessel), bracket and so on. Its main function is to remove impurities in water, so that the water meets the requirements of use.

3. Post-treatment system is an additional configuration in the case that reverse osmosis cannot meet the requirements of outlet water. Mainly including negative bed, positive bed, mixed bed, sterilization, ultrafiltration and other one or more of the equipment.

4, cleaning system is mainly composed of cleaning water tank, cleaning water pump, precision filter. When the reverse osmosis system is polluted and the effluent index cannot meet the requirements, it is necessary to clean the reverse osmosis system to restore its efficacy.

5. Electrical control system is used to control the normal operation of the whole reverse osmosis system. Including instrument panel, control panel, all kinds of electrical protection, electrical control cabinet, etc.

The pretreatment of the reverse osmosis water treatment system can ensure the stable operation and service life of the reverse osmosis device, such as the following:

(1) To prevent scaling on the film surface (including CaCo3, CaSO4, SrSO4, CaF2, SiO2, iron and aluminum oxide, etc.);

(2) to prevent colloidal substances and suspended solid particles fouling;

(3) to prevent pollution and blockage of organic matter;

(4) to prevent microbial fouling;

(5) to prevent oxidative damage to the film by oxidizing substances;

(6) Keep the water yield of reverse osmosis device stable.

Pretreatment system: iron and manganese filter, multi-media filter, activated carbon filter, sodium ion exchanger, precision filter, ultrafiltration.

FAQ:

1. What are the inlet water quality requirements for ro water treatment system membrane components?

2. What is the material of ro water treatment system membrane?

Acetate membrane (CA) : mainly because of its resistance to chlorine, so it is still durable. But its suitable pH range is small, easy hydrolysis

Aromatic polyamide membrane (PA) : water almost can not have chlorine, only through a variety of pretreatment chlorine.

3. RO water treatment system configuration?

First-stage multi-stage process: if the recovery rate is not achieved in the first stage (50-65% in the first stage and 65-75% in the second stage), the multi-stage tandem filtration can be used. The effective cross-sectional area of each segment decreases. 2:2 and 2:3 and 4:2:1

Multi-stage process: when the first stage process cannot meet the effluent quality requirements (the first stage is generally ≤20μs/cm), the product water of the first stage process is sent to another reverse osmosis unit.

The arrangement of membrane components can be divided into series and parallel.

4. What is the shell film material and specification of ro water treatment system?

Material of membrane case: stainless steel and fiberglass (FRP)

Specification of membrane shell: four inch membrane shell 4040 (one core to four core)

8 inch membrane case 8040 (one to seven cores)

Water inlet: end water inlet, side water inlet

5. What is the design water yield of ro membrane element? (except anti-pollution membrane and seawater desalination membrane)

Model 4040 is designed by 0.25m3/h

Model 8040 is designed by 1-1.2m3/h

Jufu Water is a Hi-tech enterprise which specialized in integrating Research & Development, Manufacturing, Sales, Engineering installation and Consulting on water treatment and water purification equipment and technologies.

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