1、 The difference between a first stage reverse osmosis water treatment system and a two-stage reverse osmosis water treatment system:

Primary reverse osmosis water treatment systemIt means that the pre treated water enters reverse osmosis, and then concentrated water and pure water are produced. The ion removal rate can reach about 99%. Most industrial water uses a first stage reverse osmosis water treatment system. In order to improve the output, the first stage reverse osmosis water treatment system may be divided into two stages, that is, the concentrated water in the first stage enters the second stage for treatment. Only the first stage has a first stage reverse osmosis reuse rate of about 50%, and the second stage has a reuse rate of about 70%, Dual stage reverse osmosis water treatment systemThe pure water from the first stage reverse osmosis water treatment system is further treated by the second stage reverse osmosis system, with a higher ion removal rate than the first stage, possibly reaching over 99.9%, which is suitable for places with higher requirements

II20ton/Hour dual stage reverse osmosis water treatment systemThe role of configuration

1. Raw water tank: Overcoming the instability of water supply in the pipeline network, ensuring stable and continuous water supply for the entire system; At the same time, it also provides a guarantee for the long-term stability and reliable performance of various equipment. Generally, PE or stainless steel water tanks are used, and large ones areDual stage reverse osmosis water treatment systemFiberglass or concrete water tanks will also be used. The raw water tank is equipped with a high water level float ball valve and a low water level switch, which have the advantages of high reliability, low cost, simple structure, and easy installation. When the original water tank is full of water, the float valve closes and stops the water inlet,Pure water tankWhen at low water level, the 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: forquartz sand filterreachActivated carbon filter、Softening filter、ultrafiltrationWhen the pre-treatment provides pressure, the working pressure of the booster pump is generally determined based on the design pressure drop of each pre-treatment equipment (0.05Mpa pressure drop for each filtration equipment), and the pressure before the high-pressure pump cannot be less than 0.5Kg/cm2. A regulating valve is installed after the raw water pump to adjust the pressure and inlet water volume.

3. Mechanical filter (quartz sand filter): The raw water first passes through a mechanical filter, in which 0.5-1-2-4-8-16mm quartz sand is placed to trap suspended impurities such as flocs and rust in the raw water. Due to the large amount of suspended impurities intercepted by the mechanical filter during operation, it is necessary to regularly flush and backwash the filter to ensure its normal operation. Small in sizeDual stage reverse osmosis water treatment systemSelect FRP material (fiberglass material) container largeDual stage reverse osmosis water treatment systemWe will use A3 carbon steel material, and in industries such as medicine and food, we will use stainless steel 304 or 316L material. Normally, the backwashing operation of mechanical filters is carried out using a manual controller, and the filter should be cleaned once a day for 10-20 minutes. For small filtersDual stage reverse osmosis water treatment systemIt can be controlled by an integrated manual multi way valve or a computer-controlled fully automatic machine head, of course, regardless of the size or type of large machine headDual stage reverse osmosis water treatment systemPLC and electric or pneumatic valve linkage control can be used.

4. Activated carbon filter:Dual stage reverse osmosis water treatment systemIt is very important to use activated carbon filters as pretreatment for reverse osmosis devices. 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. A carbon filter is installed in front of the reverse osmosis device for two main purposes. Firstly, it adsorbs some organic matter in the water with an adsorption rate of about 60%. Secondly, it adsorbs residual chlorine in the water, including inorganic colloids, organic colloids, and soluble organic polymer impurities with particle sizes around 10-20 angstroms, as well as residual chlorine that is difficult to remove in the sand filter. The reason why activated carbon can be used to adsorb active substances with particle sizes of around tens of angstroms is due to the presence of a large number of micropores and gaps with an average pore size of 20-50 angstroms in its structure. This structural characteristic of activated carbon allows its surface adsorption area to reach 500-2000m2/g. As the molecular diameter of organic compounds is generally slightly smaller than 20-50 angstroms, activated carbon has a strong adsorption effect on organic compounds. In addition, activated carbon has strong dechlorination ability. Due to the strong oxidizing properties of residual chlorine, it reacts with carbon to produce carbon dioxide and chloride ions, resulting in only a small amount of carbon loss. Therefore, activated carbon dechlorination can be used for a considerable period of time. Activated carbon not only has the above functions, but also can remove odors and pigments from water, improve water clarity. After a period of use, the adsorption capacity of activated carbon decreases and needs to be regenerated or replaced. So, after passing through the carbon filter, the raw water quality can be greatly improved, reducing pollution to the reverse osmosis membrane. The treated water quality can meet the requirements of the reverse osmosis device inlet water quality (residual chlorine<0.1mg/L)Dual stage reverse osmosis water treatment systemSelect FRP material (fiberglass material) container largeDual stage reverse osmosis water treatment systemWe will use A3 carbon steel material, and in industries such as medicine and food, we will use stainless steel 304 or 316L material. The control of the activated carbon filter adopts a manual controller. Due to the adsorption of a large amount of suspended impurities 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 to clean, and for small devicesDual stage reverse osmosis water treatment systemIt can be controlled by an integrated manual multi way valve or a computer-controlled fully automatic machine head, of course, regardless of the size or type of large machine headDual stage reverse osmosis water treatment systemPLC and electric or pneumatic valve linkage control can be used.

5. Fully automatic softened water filter or scale inhibitor dosing device: Whether using ion exchange resin physical adsorption method or scale inhibitor dosing method, the process of removing hardness (Ca2+, Mg2+) from water is called softening. This equipment is filled with 001 × 7 strong acid Naion exchange resinReplace 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 preventIn a two-stage reverse osmosis water treatment systemThe surface of the RO membrane is scaled to extend the service life and treatment efficiency of the reverse osmosis membrane. The water softener is a fiberglass container, and the control system usually uses American automatic control valves or domestically produced Runxin valves. According to the set time/flow rate, the control valve head can automatically regenerate resin, complete the salt absorption/backwashing, forward flushing/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: Precision filter, also known as security filter. It is raw water enteringDual stage reverse osmosis water treatment systemThe previous processing technique. PP filter element has the characteristics of high filtration flow rate, large pollutant holding capacity, and low pressure loss. It can block impurities of different particle sizes and integrate surface filtration and deep filtration. Precision filters also experience clogging after use, therefore,PP melt blown filter cartridgeReplacement required, replacement basis: Replace when the pressure difference before and after precision filtration is between 0.05-0.1Mpa.Double stage reverse osmosis water treatment system is usually usedChoose stainless steel containers

7. High pressure pump: High pressure pump is provided toDual stage reverse osmosis water treatment systemThe required water production flow rate and water quality working pressure. 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. Generally, multi-stage high-pressure pumps with a head of over 100m are used based on the required working pressure of the reverse osmosis membrane.In a two-stage reverse osmosis water treatment systemWhen 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.

8R.O Pure Water Treatment MachineThe 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%. Due to the advantages mentioned above, ESPA membranes provide a wider range of space for the selection of supporting equipment such as water pumps, pressure vessels, pipelines, valves, etc. And using a motor with lower power can meet the needs of work. At the same time, the high water flux and high desalination rate of ESPA membranes greatly reduce equipment manufacturing costs and system equipment investment expenses, and can save a lot of energy, reduce system operating costs, and improve water quality.Dual stage reverse osmosis water treatment systemThe designed water production temperature is 25 ℃, and the water utilization rate is 50-70%.

9. Purified water tank (finished water tank): reserveDual stage reverse osmosis water treatment systemProduct water and provide stable water supply for the operation of the next level system. 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. 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.

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