Brief introduction of reverse osmosis water purification system

RO water treatment equipments is generally adopted by pure water plant,mineral water plant,bottled water plant, beverage processing plant, etc. and used in pure water production line, beverage production line, fruit juice production line, yogurt production line, and more. Reverse osmosis water purification is the removal of contaminants from untreated water to produce drinking water that is pure enough for its intended use, most commonly human consumption. Substances that are removed during the process of drinking water treatment include suspended solids, bacteria, algae, viruses, fungi, minerals such as iron, manganese and sulphur, and man-made chemical pollutants including fertilisers.

1). This system adopts the most advanced Reverse Osmosis pure water filter technic. Its water production conductance rate generally less than 10us/cm, which precedes the national standard GB17323-1998. The reverse osmosis water made by this RO system is asepsis, non-granule and pure.
2) The RO membranes of this system adopt American hydranautics membrane or the American Dow membrane

Advantages of the RO water treatment equipment

1) Our pure water treatment equipment can remove all types of contaminants to some extent, including particles, pyrogens, microorganisms, colloids and dissolved inorganics.
2) Minimal maintenance is required and thus the water treatment machine is very economical.
3) We provide tailor-made systems as per raw water condition and specific needs of customers.
4) The water treated by our pure water treatment equipment tastes sweet.
Angel Drinking Water Equipment Company is one of the leading manufacturers and suppliers drinking water treatment equipment in China. To satisfy diversified needs of customers, we provide many different models of the water treatment equipment, which are popular with customers. Meanwhile, water bottling equipment, water filling equipment, wrap shrink packaging machine, and more, are also available. For more information about our drinking water equipment, please go to products page or directly contact us. We at Angel are ready to serve you.

Functions of the reverse osmosis water treatment machines

Prevention of membrane fouling (including Fe3, Fe2, CaCO3, CaCO4, SrSO4, CaF2, SiO2, iron, aluminum oxide).
Prevention of colloidal material and suspended solid particles from plugging.
To prevent organic fouling
To prevent microbial fouling
To prevent the oxidation of substances on the oxidative damage to membrane
To maintain the ultrafiltration plant capacity stability
RO membranes auto wash and manual wash
RO membranes manual wash with medicine
Pure water high water level auto stop,low water level auto start
Multi-phases pump protected without water
Protected when no power,poor power,large electrical cuttent short circuit,creepage of electricity.
In light of corrosion, pressure, vibration and temperature when choosing filter materials, we offer tailor-made solutions according to raw water conditions of our customers. For example, if the TDS of raw water is very high, customers will be recommended to use fiber glass filter tank so as to optimize the whole water treatment system and also prolong the life of the reverse osmosis water treatment equipment.

Whole RO pure water production line technical process

Remark: The above mentioned filtration process is our typical design. Actually, the final filtration process will depend upon your raw water analysis reports and your special requirements.

SUS304 Raw water tank
If the booster pump direct extraction pipe water, May because of lack of water flow and the instability
Pressure lead to damage the pump or affect the normal operation of the system, Use one raw water
tank to offer water can avoid that happen.
The raw water tank with built-in water stainless steel ball valve and liquid level controller, large equipment need a water inlet of electric butterfly valve.
1. Inlet valve function is control of raw water into the water, make sure the system can timely
replenishment water.
2. Liquid level controlled have middle water level and low water level, Its function is to control the
booster pump’s start and stop; when the water level above the water level, the booster pump can
be started automatically; when the water level is below the low water level, booster pump auto stop.

SUS304 Pure water tank 
Its used to store pure water
Water tank has three water level: high level, middle level, low level, when the water level at low level the pure water pump automatic stop supply water until the water of the pure water tank water level reaching or above the middle water level can be automatically activated, restoration of water supply; water level below the middle water level the high pressure pump automatic starting the system to producing water until the water level reach the high level, high pressure pump auto stop running.

Raw water pumps (booster pump):stainless steel centrifugal pump
To deliver the raw water to the pre-treatment system and the RO system, control system of the pressure pump will be synchronized by PLC system with the whole filtration system.
Our company offer export brand booster pump like:
Rich; Germany Ville; Spanish Espa
China brand booster pump like : The South Pump, Wuxi Joyoung pump
Free repair of mechanical seal pump, Efficient, Low noise, Stable and reliable performance.
Liquid level controller control the booster pump’s start and stop.

Quartz sand filter
The quartz sand filter is widely used in drinking water treatment to remove different types of particles, such as suspended solids (turbidity), colloidal compounds and etc. This process will reduce the load on the back-end filters
Water production index: SDI The design of single pressure filter is adopted in this system. In order to protect the back-end filters, we adopt one pressure filter. After a period of time, the filter will be saturated. In order to restore its function, the filter needs backwashes. In order to achieve its best results, the efficient backwash needs taking 20-30min. This filter is fitted with two diffusers, a manhole for discharge media.
Manhole for Maintenance
The manhole is made of food grade fiber glass. Moreover, the material of the sealed part connecting the tank is sanitary silicone, completely in line with the requirements of food hygiene .
Diffuser
The tow diffuser, are installed in the upper and lower part of the filter. Their main function is to make the compressed air and the water distribute evenly during backwash

Activated carbon filter
With a valve operating system, pipeline system, containing the manhole, hand hole, the upper and lower water distribution devices, media, pressure.
The active-carbon filter is the key device, commonly used for removal of organic substance and heavy metal element, suspended solids and etc. It can effectively reduce the level of COD and improve the taste of water. The designed flow the 7m3/h. After a period of time, the media will be saturated and it needs backwashes. In order to achieve its best results, the efficient backwash needs taking 20-30min. This filter is fitted with two diffusers, a manhole for load media..
The tow diffuser, are installed in the upper and lower part of the filter. Their main function is to make the compressed air and the water distribute evenly during backwash
1, Adsorption of organic matter in water part of the adsorption rate of 60%:
2, Absorption chlorine, active carbon adsorption removal of chlorine is not a simple role, but its surface as a catalyst, so full of activated carbon adsorption problem does not exist, but the loss of carbon only.
After the quartz sand filter and active carbon filter, the water basically required the water treatment plants water standard: SD1 ≤ 4; TDS≤400

Chemical dosing system:
a. Scaling chemical dosing
Confirm the type of the scaling chemical, basically FeCl3 will be added and assistant scaling content like bone being injected in the pre-treatment part (in between the deposit tank and the deposit-filtering tank)
b. Redox chemical dosing
NaHSO3 will be considered a good redox chemical for the Chloride removal purpose.
Being injected before the ultrafiltration system or before the Reverse Osmosis system
c. PH adjustment or other scaling chemical dosing

Precision filters:
Prevent the particles entering the membrane, scratched the surface of the membrane. In the normal operating condition, the filter can maintained for 3 mouth. The filter structure for fast replace.
Manufacture of high quality PVC material. Filter holder containing a fixed
The 5μm PP filter is most commonly used for dealing the pure water. It is generally believed that the harmful particles and bacteria are larger than 0.22μm. In order to prolong the life of RO system, the whole system adopts one set of stainless pp filter. The polypropylene microporous filter cartridges with the length of 40 inch in 5μm filters respectively. The 5μm filter acts as the protector of the RO system, filtering the vast majority of particles in the water, which eases the load of RO system and prolong its life. The filter cartridges are for one-time use, as the particles retained in the gap of microporous filtering film is hardly removed by rinsing with acid-base. After a period of time, the filter cartridge needs to be replaced. The structure of them makes replacement of cartridge convenient.
This apparatus contain filtration cartridges and stainless support layers. The support layer is made of stainless steel 304, with the advantages of compact structure, beautiful shape, high flux, good filtration accuracy and etc.

High pressure water pump.
High pressure pump is mainly to add pressure of the inlet water into a certain standard so that the pressure difference will be enough for the Reverse Osmosis need,
High pressure pump is adopting plunger pump:

RO Device
The RO device removes the hydronium, organic substance, colloid, bacteria and other impurity by the method of membrane.  And the water can be desalted and purified. The theory is as follows. The treated water and the untreated water are separated by the membrane; the treated water osmoses to the untreated water. There is osmotic pressure between the two. If the pressure is added to the untreated water and the pressure of the untreated water is bigger than the osmotic pressure, the water of the untreated water osmoses to the opposite position of the water. This applies the reverse osmosis to the desalted water. That is to say the untreated water is purified into the pure water through the RO membrane under adequate pressure. The left water which can not osmosis through the membrane contains a lot of solute and suspended substance, and it will be drained out as waste water.
The water must be pretreated before entering into the RO system, or it will bring damage to the RO membrane.
The RO system not only can be used for desalination, but also for filtering the organic substance and bacteria.
The production of water is monitored by the liquid crystal display conductivity meter.
The RO system needs be cleaned timely, including the stainless steel pump, filter, disinfectant tank, valve and other components.
Commonly, the RO system should work once every day.  If it does not work in one week, it must be protected by some measures, or the service life of the membrane will be serious affected.

RO device employs low pressure large flux membrane made by American Dow Company. The type is American Dow BW30-4040 Ro Memebrane, and it has nine of them.  The membranes can serve for years in good maintenance. This instruction explains the details of operation and maintenance methods. The RO device removes the hydronium, organic substance, colloid, bacteria and other impurity by the method of membrane. And the water can be desalted and purified. The theory is as follows. The water and the solution are separated by the membrane; the water osmoses to the solution. There is osmotic pressure between the two. If the pressure is added to the solution and the pressure of it is bigger than the osmotic pressure, the water of the solution osmoses to the opposite position of the water. This applies the reverse osmosis to the desalted water. That is to say the raw water is purified into the pure water through the RO membrane under adequate pressure. The left water which can not osmosis through the membrane contains a lot of solute and suspended substance, and it will be drained out as waste water. This principle makes RO device.

Pipeline and other material between the equipments
The pipeline of the equipment is made of food-grade PVC-U. The connecting part of PVC-U sealed part is sanitary silicone, completely in line with the requirements of food hygiene

Control devices
The whole automatic production line is achieved through the PLC and data collector such as the liquid lever sensor, flow sensor and etc. The whole production line is monitored by liquid level sensor. When the water level of the product water tank is high, the system will stop automatically. When the water level of the product water tank is low, the system will run automatically. This ensures the production line is synchronized with filling production line.

Assistant devices for the RO system:
Membrane cleaning:
Membrane cleaning system is composed of the cleaning tank, cleaning pump, cleaning filters.
After long term running the RO system might have slight pollution of the RO membrane , which will affect the inlet and output pressure of the RO membrane, it need chemical cleaning to remove the salt content on the surface of the membrane. Daily rinse process is along with each time turning on/off the machine by low pressure cleaning, but after long term of running, the membrane system should be cleaning by chemical content.
Reverse Osmosis inlet water part pressure switch, if the inlet water pressure is below 0.1 to 0.15Mpa, the high pressure pump will stop working, and energy recycling will stop working also, if it’s over 0.1 to 0.15Mpa, the system will run automatically.
Reverse Osmosis output part side mounting pressure system, if the rated pressure is over 0.2 to 0.3Mpa, pressure switch will send signal to stop the high pressure from working.
Reverse Osmosis waste water part automatic valve system, on the high pressure pump start running and stop point, the PLC system will give signal to automatic rinse the RO membrane system.
Chemical washing for the RO membrane by manual control.
System component:
Piping system and valves:
water system Low pressure part using UPVC material, High pressure part using SS304 material.
Pure water part using UPVC material
Valves: Low pressure part UPVC material, high pressure part: SS304 material.
System low feed water pressure protecting system, high pressure protecting switch system.
d). Indicating gadgets for monitor use.
e). Sample getting point on the side of the membrane unit to get pure water sample.

Reverse osmosis part:
Reverse Osmosis inlet water part pressure switch, if the inlet water pressure is below 0.1 to 0.15Mpa, the high pressure pump will stop working, and energy recycling will stop working also., if it’s over 0.1 to 0.15Mpa, the system will run automatically.
Reverse Osmosis output part side mounting pressure system, if the rated pressure is over 0.2 to 0.3Mpa, pressure switch will send signal to stop the high pressure from working.
Reverse Osmosis waste water part automatic valve system, on the high pressure pump start running and stop point, the PLC system will give signal to automatic rinse the RO membrane system.
Chemical washing for the RO membrane by manual control.

Ultraviolet sterilization assembly(UV)
Ultraviolet ( UV ) is a kind of disinfectant, it can kill bacteria and viruses, including microbial, although some microorganisms than other microorganisms on UV bear ability better. This process does not use chemical products, but to allow water in the inner container subjected to high intensity of UV irradiation. Ultraviolet light can at the cell level to destroy microbes: kill them, or make them lose the ability to replicate. No replication-competent virus is harmless.