Reverse osmosis process flow-Yuanlai Water Treatment

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Reverse osmosis process flow

Released Date: Jun 17,2015 Article Source: Yuanlai Water Treatment

Beijing Yuanlai Water Treatment Equipment Co., Ltd. provides (reverse osmosis process flow)

Reverse osmosis process flow
　Raw water → Raw water tank → Raw water pump →Multi-media filter (Quartz sand filter→Activated carbon filter →Soft water processor (Scale inhibitor addition device→ Precision filter →High-pressure pump → First-stage reverse osmosisRO"Device" →Ultraviolet device (ozone device → Water usage point

Process description
I. Raw water tank
1Function: Overcome the instability of water supply in the pipeline network and ensure the stable and continuous water supply of the entire system. It also provides a guarantee for the long-term reliable performance of each device.
2Selection:PEMaterial or stainless steel water tank.
3Control: The water tank is equipped with a high water level float valve and a low water level switch. It features high reliability,Low price,Simple structure,It has the advantages of easy installation, etc. When the water level is high, the float valve closes to stop water inflow. When the water level is at a low level, the high water level float valve opens and starts to fill the water tank with water. At the same time, the low water level liquid level switch opens and the booster pump stops working.
Ii. Raw water pump
1Function: To provide the necessary working pressure for each pretreatment device.
2) Selection: Based on the design pressure drop of each pretreatment device (the maximum pressure drop for each filtration device)0.05MpaAnd the pressure before the high-pressure pump must not be less than 0.5Kg/cm2Determine the working pressure of the booster pump.
3Control: The pressure and water inflow are regulated by a regulating valve after the pump.
Iii. Activated Carbon Filter
1Function: This process employs an activated carbon filter as a pretreatment for the reverse osmosis device, which is of great significance. The reverse osmosis system requires feed water indicatorsSDI≤5Residual chlorine<0.1mg/L. To meet its feed water requirements, the raw water needs to be further purified to reach the feed water standards for reverse osmosis. The carbon filter installed before the reverse osmosis device mainly has two functions:
   AIt adsorbs some organic substances in water, with an adsorption rate of60%Left and right
   BAdsorb residual chlorine in water. Adsorption particle size10-20Inorganic colloids, organic colloids and dissolved organic polymer impurities of about a and in the sand filter   It contains residual chlorine that is difficult to remove. The reason why activated carbon can be used to adsorb active substances with particle sizes of around several tens of angms is that its structure contains a large number of average pore sizes20-50The micropores and particle gaps of activated carbon, this structural feature, enable its surface adsorption area to reach500-2000m2/gBecause the molecular diameter of common organic substances is slightly smaller than20-50Therefore, activated carbon has a strong adsorption effect on organic matter. In addition, activated carbon has a strong dechlorination capacity. Due to the strong oxidizing property of residual chlorine, it reacts with carbon to form carbon dioxide and chloride ions. Therefore, only a small amount of carbon is lost, so 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 in water and improve water clarity. After being used for a period of time, the adsorption capacity of activated carbon decreases and it needs to be regenerated or replaced. Therefore, after the raw water passes through the carbon filter, the water quality can be greatly improved, and the pollution to the reverse osmosis membrane can be reduced. The treated water quality can all meet the feed water quality requirements of the reverse osmosis device (residual chlorine)<0.1mg/L"
Iv. Mechanical Filters (Quartz Sand Filters)
1Function: The raw water first passes through a mechanical filter and is placed in the filter12-24The purpose is to refine quartz sand to cause flocculation in the raw water Suspended impurities such as body and rust are retained during this process. As the mechanical filter retains a large amount of suspended impurities during operation, to ensure the normal operation of the filter, it is necessary to regularly flush and backwash the filter.
2Selection: ChooseFRPMaterial (fiberglass reinforced plastic) container.
3Control: The backwashing operation of the mechanical filter adopts a manual controller. The filter should be cleaned once a day, and the cleaning time is10-20Minutes.
2Selection: Choose fiberglass reinforced plastic (FRP) material containers with an expansion rate40%.
3Control: The control of the activated carbon filter adopts a manual controller because the activated carbon filter adsorbs a large amount of suspended matter during operation Impurities: To ensure the normal operation of the system, flushing and backwashing are carried out every day. The flushing process lasts for a cleaning time of15-30Minutes.
V. Fully automatic water softener or dosing device
1Function: Remove hardness from waterCa2+ ,Mg2+The process of this is called softening. This equipment is filled001×7Strong acid typeNaIon exchange resin uses sodium ions to replace calcium and magnesium ions in the raw water, reducing the residual hardness of the raw water to less than0.03mmol/L. The purpose of softening is to prevent scaling on the surface of reverse osmosis membranes, thereby extending the service life and treatment efficiency of reverse osmosis membranes.
2Selection: The water softener is a fiberglass reinforced plastic container
3Control: The control system adopts the automatic control valve type from the United States. According to the set time/The flow rate and control valve head can automatically regenerate resin to complete the process of salt absorption, backwashing, forward flushing and water injection. The water softener is equipped with a regeneration tank. The salt and water levels in the salt tank should be checked daily, and salt should be replenished in a timely manner (iodized salt and other salts with additives are prohibited).
Vi. Precision Filters
1Function: Precision filtration is also known as a security filter. It is a treatment process before the raw water enters the reverse osmosis membrane device.PPThe filter element features a large filtration flow rate, a large dirt-holding capacity, and low pressure loss. It can block impurity particles of different sizes and integrates surface filtration and deep filtration. Precision filters may also get clogged after a certain period of use. Therefore, after a certain period of timePPMelt-blown filter element replacement, replacement basis: The pressure difference before and after precision filtration is0.05-0.1MpaReplace it when necessary.
2Selection: Choose containers made of stainless steel.
Vii. High-pressure Pump
1Function: The high-pressure pump provides the required water production flow and water quality working pressure for the reverse osmosis system. Let the filtered water pass through the pump body to reach to10A pressure of about kilograms is required to meet the feed water pressure of the membrane body and ensure the output of pure water.
2Selection: According to the working pressure required by the reverse osmosis membrane, Grundfos vertical multistage high-pressure pumps are adopted.
3Control: When the pointer of the raw water pressure gauge reaches2KGAt that time, press the water production switch, the high-pressure pump starts, and water production begins. A pressure protection switch is installed in front of the high-pressure pump. When the inlet water pressure is lower than1KGAt that time, the pressure protection switch is closed and the high-pressure pump stops working.
Viii. Reverse Osmosis Unit (Pure Water Unit)
1Function: The reverse osmosis device is the main component of the purified water production line. The imported membrane can achieve high water flux and its average desalination rate at a relatively low operating pressure99.5%. Imported membranes have the above-mentioned advantages, thus providing a broader space for the selection of supporting equipment such as water pumps, pressure vessels, pipelines and valves. Moreover, a motor with a smaller power can meet the working requirements. Meanwhile,ESPAThe high water flux and high desalination rate of the membrane significantly reduce the manufacturing cost of the equipment and the investment cost of the system equipment. Moreover, it can greatly save energy, lower the operating cost of the system and improve water quality.
2Selection: Imported membrane, the designed product water temperature of the reverse osmosis device25℃The utilization rate of water is70%.
Ix. Fine Filtering Processor
Function: Selected1μmPolypropylene material filter elements can effectively retain extremely tiny particles and kill dead bodies in the pipeline. It has a long service life, large flow rate and high filtration accuracy, ensuring sterile water supply for the production line. After the fine filtration processor has been in use for a certain period of time, if the water production decreases due to clogging, the filter element should be replaced. The basis for replacement is: the pressure difference before and after filtration is0.05-0.1MpaReplace it when necessary.
X. Testing Instruments and Meters
1The reverse osmosis main unit is equipped with pre-membrane pressure gauges and post-membrane pressure gauges to detect the working pressure of the membrane. It also has a system path operation display, as well as fresh water flow meters and concentrated water flow meters to measure the flow rates of concentrated and fresh water.
2The reverse osmosis main unit is also equipped with a conductivity meter and a resistivity meter. Online detection of fresh water quality is both intuitive and convenient, allowing for the observation of water quality changes in product water at any time.
3The pretreatment is equipped with a pressure gauge to monitor the operation status of the equipment at any time and to analyze the operation status of the equipment.
Xi. Water Tank (Raw Water Tank
   Function: Store reverse osmosis product water and provide stable water supply for the operation of the next-level system. Control: The water tank is equipped with high and low liquid level switches Turn off and control the high-pressure pump and the booster pump. When the balance water tank is at a low water level, the booster pump starts automatically and begins to produce water. When the water tank is at a high water level, the high-pressure pump stops working.
Twelve. Booster Pump
1Function: To provide the necessary working pressure for the subsequent mixed bed.
2Control: The pressure and water inflow are regulated by a regulating valve after the pump (manual operation).
Xiii. Purified Water Tank (Finished Water Tank
1Function: The effluent from the mixed bed enters the purified water tank and is then sent to each water usage point through the purified water tank.
2Control: The purified water tank is equipped with high and low liquid level switches to control the feed water pump of the mixed bed. When the water level in the purified water tank is low, the mixed bed feed water pump starts to work Fill the purified water tank with water. When the water level is high, the feed water pump of the mixed bed stops working.

Keywords: Water Softening Equipment Automatic Water Softener Reverse Osmosis Equipment Manufacturer of Water Treatment Equipment

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