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Process flow and principle of reverse osmosis water treatment equipment!

May 19, 2023

1.What is reverse osmosis water treatment?

Reverse Osmosis (RO) water treatment is a process that uses a semi-permeable membrane to remove pollutants and impurities in water. It is an effective method of water treatment and is commonly used in domestic and industrial applications.

Reverse osmosis, also known as reverse osmosis (RO), uses a certain pressure to separate the solvent in the solution through the reverse osmosis membrane. Because it is opposite to the direction of natural infiltration, it is called reverse osmosis. According to the different osmotic pressures of various materials, the reverse osmosis method greater than the osmotic pressure can achieve the purpose of separation, extraction, purification and concentration.

2.How does reverse osmosis water treatment work?

Reverse osmosis water treatment is the most precise membrane liquid separation technology. The operating pressure is applied on the feed water (concentrated solution) side to overcome the natural osmotic pressure. When the operating pressure higher than the natural osmotic pressure is applied to the concentrated solution side, the water molecules naturally The flow direction of osmosis will be reversed, and the water molecules in the feed water (concentrated solution) will pass through the reverse osmosis membrane to become the purified water on the dilute solution side; the reverse osmosis equipment can block all soluble salts and organic substances with a molecular weight greater than 100, but Allowing water molecules to pass through, the desalination rate of the reverse osmosis composite membrane is generally greater than 98%.

 

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3.Reverse osmosis water treatment process

Reverse osmosis water treatment is designed with special RO technology, key components and equipment are imported famous brand products, advanced technology, reliable quality, strong scalability, reasonable structure, small footprint, high water utilization rate, low energy consumption, fully automatic operation, Simple operation and maintenance. Generally, the lower limit of water production is 0.25m3/hr, and the upper limit is not limited. The water recovery rate can generally reach more than 75%, and the desalination rate> 98%. The permeated water will change with the decrease of the feed water temperature and the aging or pollution of the reverse osmosis membrane. the
Primary reverse osmosis: pretreatment - reverse osmosis - purified water tank - ion exchanger - ultraviolet lamp - pure water pump - water point
Two-stage reverse osmosis: pretreatment - one-stage reverse osmosis - two-stage reverse osmosis (positive charge reverse osmosis membrane) - purified water tank - pure water pump - ultraviolet lamp - water point
One-stage reverse osmosis + EDI: pretreatment - reverse osmosis - intermediate water tank - intermediate water pump - EDI device - purified water tank - pure water pump - ultraviolet lamp - water point
Two-stage reverse osmosis + EDI: pretreatment → ultraviolet sterilization device → primary RO device → secondary RO device → intermediate water tank → EDI device → deoxygenation device → nitrogen blanketed pure water tank → TOC UV removal device → polishing mixed bed → ultrafiltration device → water point
1. Raw water tank (optional) flow chart of reverse osmosis equipment
Store raw water for sedimentation of large sediment particles and other sedimentable substances in the water. At the same time, it buffers the impact of the unstable water pressure in the raw water pipe on the water treatment system. (such as the response of the pressure sensor caused by too low or too high water pressure).
2. Raw water pump
Constant system water supply pressure, stable water supply.
3. Multimedia filter
The main purpose of the filter with multiple filter layers is to remove the sediment, rust, colloidal substances, suspended solids and other particles contained in the raw water with a particle size of more than 20um. Manual valve control or automatic controller can be used for backwashing. A series of operations such as washing. Ensure the water quality of the equipment and prolong the service life of the equipment.
4. activated carbon filter
The system uses a shell activated carbon filter, which can not only absorb electrolyte ions, but also perform ion exchange adsorption. Adsorption by activated carbon can also reduce the oxygen consumption (COD) of potassium permanganate from 15 mg/L (O2) to 2-7 mg/L (O2). It plays a catalytic role, removes pigments, odors, a large number of biochemical organic substances in water, reduces the residual chlorine value of water and pesticide pollutants, and removes trihalides (THM) and other pollutants in water. Manual valve control or fully automatic controller can be selected for a series of operations such as backwashing and positive flushing. Ensure the water quality of the equipment and prolong the service life of the equipment. At the same time, the equipment has a self-maintenance system, and the operating cost is very low.
5. Ion softening system/dosing system
The R/O device is used for the concentrated discharge of dissolved solids and the utilization of fresh water. In order to prevent the concentration of CaCO3, MgCO3, MgSO4, CaSO4, BaSO4, SrSO4, and SiSO4 at the concentrated water end, especially the concentrated water side of the last membrane module of the RO device If the product is greater than its equilibrium solubility constant, crystallization will occur, which will damage the original characteristics of the membrane. Before entering the reverse osmosis membrane module, an 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 precision filter is used to remove the suspended solids, non-straight particles and colloids left in the influent water, so that the operation of subsequent equipment such as the RO system is safer and more reliable. The filter element is a 5um melt-blown filter element, the purpose of which is to remove impurities larger than 5um that are missed by the upper filter unit. Prevent it from entering the reverse osmosis device to damage the surface of the membrane, thereby damaging the desalination performance of the membrane.
7. reverse osmosis system
The reverse osmosis device uses sufficient pressure to separate the solvent (usually water) in the solution through the reverse osmosis membrane (or semi-permeable membrane), because this process is opposite to the direction of natural osmosis, so it is called reverse osmosis. The reverse osmosis method can adapt to various types of raw water with saline content, especially in water treatment projects with high saline content, and can obtain good technical and economic benefits. The desalination rate of the reverse osmosis method is improved, the recovery rate is high, the operation is stable, the floor space is small, and the operation is simple. While the reverse osmosis equipment removes salt, it also removes most bacteria, colloids and large molecular weight organic matter.

8.Ozone sterilizer/UV sterilizer (optional) - Eliminates bacteria generated from secondary contamination to ensure the sanitary quality of the finished water.

4.Application fields of reverse osmosis water treatment equipment

  1. Water for Electronic Industry - Water used for rinsing integrated circuits, silicon wafers, display tubes, and other electronic components.
  2. Water for Pharmaceutical Industry - Water used in pharmaceutical and formulation processes, medical blood dialysis, biochemical analysis, intravenous infusion, large infusion, injections, tablets, biochemical products, equipment cleaning, etc.
  3. Water for Chemical Industry Processes - Water used in chemical circulation systems, chemical product manufacturing, etc.
  4. Boiler Feed Water for Power Industry - Water used in thermal power boiler systems, medium and low-pressure boiler power systems in factories and mines.
  5. Water for Food Industry - Purified drinking water, beverages, beer, liquor, health products, etc.
  6. Seawater and Brackish Water Desalination - Desalination of seawater for islands, ships, offshore drilling platforms, brackish water regions.
  7. Drinking Purified Water - Water used in real estate properties, communities, enterprises, and institutions.
  8. Other Process Water - Deionized water for electroplating processes, pure water for battery production processes, pure water for surface coating and cleaning of automobiles and household appliances, pure water for coated glass, desalinated water for textile dyeing and printing processes.
  9. Deionized water for electroplating processes, pure water for battery production, pure water for surface coating and cleaning of automotive and building materials products, pure water for coated glass, and desalinated water for textile dyeing processes.

5.How to deal with the concentrated water after reverse osmosis water treatment?

Concentrated water (also known as concentrated water) produced during reverse osmosis water treatment usually requires further treatment or recycling. Concentrate water treatment methods may include re-treatment through reverse osmosis, salt recovery or other treatment methods.

6.8T/H reverse osmosis water treatment equipment display

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