Reverse osmosis pure water equipmentApplication scope

1. Preparation of pure water and ultrapure water in industries such as electronics, industry, pharmaceuticals, and food;
2. Purification and preparation water for process water/chemical circulating water in the textile and chemical industries, as well as for chemical product manufacturing;
3. Water for purification and preparation of water for food and beverage industry, purified drinking water, beverages, beer, Baijiu, health products, etc;
4. Concentrate and recover useful substances from aqueous solutions in industrial production;
5. Pre desalination treatment of high-pressure boiler feedwater for enterprises in the power industry, thermal power generation boilers, and power systems for medium and low pressure boilers in factories and mines;
6. Desalination of brackish water and seawater;
7. The purified water device serves as the primary desalination equipment for high-purity water production.
8. Various types of enterprises and institutions with a large number of people, such as communities, real estate properties, schools, factories, hospitals, teahouses, hotels, beauty salons, canteens, etc.
9. It can be used for the production of bottled water, mineral water, and other bottled water.
10. Rinse water for electronic components such as integrated circuits, silicon chips, and display tubes in the electronic industry
11. The pharmaceutical industry uses large amounts of water for infusion, injections, tablets, biochemical products, equipment cleaning, etc;
12. Desalination of seawater and brackish water in islands, ships, offshore drilling platforms, and brackish water areas
13. Other processes use ultrapure water for painting automobiles, household appliances, coated glass, cosmetics, fine chemicals, etc.
14. Electroplating industry water - water for cleaning workpieces, water for tank solutions

Process flow and description of reverse osmosis pure water equipment

1. Process flow of reverse osmosis pure water equipment

Raw water → Raw water tank → Raw water pump → Multi medium filter (quartz sand filter) → Activated carbon filter → Soft water processor → Precision filter → High pressure pump → Primary reverse osmosis (RO) device → Purified water tank → High pressure pump → Secondary reverse osmosis → Ultraviolet sterilization device → Water point

2. Reverse osmosis pure water equipment, reverse osmosis equipment process description

1. Raw water tank

1) Function: Overcome the instability of pipeline water supply and ensure the stable and continuous water supply of the entire system; At the same time, it also provides a guarantee for the long-term reliable performance of various devices.

2) Selection: PE material or stainless steel material water tank.

3) Control: The water tank is equipped with a high water level float valve and a low water level switch. It has the advantages of high reliability, low cost, simple structure, and easy installation. When the water level is at a high level, the float valve closes and stops water intake. When the water level is at a low level, the high level float valve opens and begins to inject water into the water tank. At the same time, the low water level switch is disconnected, and the booster pump stops working.

2. Raw water pump

1) Function: Provide necessary working pressure for pre-processing equipment.

2) Selection: Determine the working pressure of the booster pump based on the design pressure drop of each pre-treatment equipment (maximum pressure drop of 0.05Mpa per filtration equipment) and the fact that the pressure before the high-pressure pump cannot be less than 0.5Kg/cm2.

3) Control: Use a regulating valve after the pump to adjust the pressure and inlet water volume.

3. Mechanical filter (quartz sand filter)

1) Function: The raw water first passes through a mechanical filter, where 12-24 mesh fine quartz sand is placed to trap suspended impurities such as flocs and rust in the raw water during this process. Due to the mechanical filter capturing a large amount of suspended impurities during operation, it is necessary to regularly flush and backwash the filter to ensure its normal operation.

2) Selection: Choose FRP material (fiberglass material) container

3) Control: The backwashing operation of the mechanical filter adopts a manual controller, and the filter should be cleaned once a day for 10-20 minutes.

4. Activated carbon filter

1) Function: This process uses an activated carbon filter as a pre-treatment for the reverse osmosis device, which is very important. The reverse osmosis system requires an inlet water index SDI ≤ 5 and residual chlorine<0.1mg/L. To meet its inlet requirements, it is necessary to further purify the raw water to achieve the inlet index of reverse osmosis. Installing a carbon filter in front of a reverse osmosis device has two main functions:
1. Adsorb some organic matter in water with an adsorption rate of about 60%
2. Adsorb residual chlorine in water. Inorganic colloids, organic colloids, and soluble organic polymer impurities with adsorption particle sizes of around 10-20 angstroms, as well as residual chlorine that is difficult to remove in sand filters.
2) Selection: Use fiberglass material container with an expansion rate of 40%.

3) Control: The control of the activated carbon filter adopts a manual controller. Due to the large amount of suspended impurities adsorbed by the activated carbon filter during operation, in order to ensure the normal operation of the system, flushing and backwashing must be carried out every day. The flushing process takes 15-30 minutes for cleaning.

5. Fully automatic water softener or dosing device

1) Function: Remove hardness (Ca) from water²⁺、 Mg²⁺）The process is called softening. This equipment is filled with 001 × 7 strong acid Na ion exchange resin, which replaces calcium and magnesium ions in the raw water with sodium ions to reduce the residual hardness in the raw water to below 0.03mmol/L. The purpose of softening is to prevent scaling on the surface of the reverse osmosis membrane, in order to extend its service life and treatment efficiency.

2) Selection: The water softener is a container made of fiberglass material,

3) Control: The control system adopts the American automatic control valve type. According to the set time/flow rate, the control valve head can automatically regenerate the resin, complete the salt absorption backwash, and forward water injection process. The water softener is equipped with a regeneration tank, and the salt and water levels in the tank should be checked daily, and salt should be replenished in a timely manner (iodized salt and other salt with additives are prohibited).

6. Precision filter

1) Function: Precision filtration, also known as security filter.

2) Selection: Choose stainless steel containers

7. High pressure pump

1) Function: The high-pressure pump provides the working pressure for the required water production flow rate and water quality of the reverse osmosis system. Make the filtered water reach a pressure of about 10 kilograms after passing through the pump body to meet the inlet pressure of the membrane body and ensure the output of pure water.

2) Selection: According to the required working pressure of the reverse osmosis membrane, a Grundfos vertical multi-stage high-pressure pump is used.

3) Control: When the pointer of the raw water pressure gauge reaches 2KG, press the water production switch to start the high-pressure pump and begin water production. A pressure protection switch is installed in front of the high-pressure pump. When the inlet pressure is below 1KG, the pressure protection switch is turned off and the high-pressure pump stops working.

8. Reverse osmosis device (pure water device)

1) Function: The reverse osmosis device is the main part of the purified water production line. This device uses energy-saving composite membrane ESPA type reverse osmosis membrane components produced by Japanese Nippon Denko Group and American Heideneng Company. The ESPA series is a high desalination rate desalination membrane for brackish water. High water flux can be achieved at lower operating pressures, with an average desalination rate of 99.5%.

9. Water tank (raw water tank)
Function: Reserve reverse osmosis product water and provide stable water supply for the next level system operation.
Control: The water tank is equipped with high and low level switches to control the high-pressure pump and booster pump. When the balance water tank is at a low water level, the booster pump automatically starts to produce water. When the water tank is at a high water level, the high-pressure pump stops working.

10. Boosting pump

1) Function: Provide necessary working pressure for the later stage mixed bed.

2) Control: Use a regulating valve to adjust the pressure and water intake after the pump (manual operation).

11. Purified water tank (finished water tank)

1) Function: The mixed bed effluent enters the purified water tank and is then sent to various water consumption points through the purified water tank.

2) Control: The purified water tank is equipped with high and low level switches to control the water supply pump of the mixed bed. When the purified water tank is at a low water level, the mixed bed feedwater pump starts working to inject water into the purified water tank; When the water level is high, the mixed bed feedwater pump stops working.

12. Fine filtering processor

1) Function: Using a 1 μ m polypropylene filter element, it can effectively trap extremely small particles and kill bacterial corpses inside the pipeline. It has a long lifespan, high flow rate, and high filtration accuracy, ensuring sterile water supply for the production line. After a certain period of use, if the water production of the fine filtration processor decreases due to blockage, the filter element must be replaced. The replacement basis is to replace it when the pressure difference before and after filtration is between 0.05-0.1Mpa.

13. Testing instruments and meters

1) The reverse osmosis host is equipped with a pre membrane pressure gauge and a post membrane pressure gauge to detect the working pressure of the membrane, and is also equipped with a system path operation display. The fresh water flow meter and concentrated water flow meter detect the flow rates of concentrated and fresh water.

2) The reverse osmosis host is also equipped with a conductivity meter and a resistivity meter. Online detection of freshwater quality is both intuitive and convenient, allowing for real-time observation of changes in product water quality.

3) Pre processing is equipped with pressure gauges to observe the operation status of the equipment at any time and analyze its operation status.