1. Basic principle of reverse osmosis equipment
Reverse osmosis membrane separation technology (referred to as RO technology) is the reverse process of osmosis. Its principle is that water and solution are separated by a osmotic membrane, and the water penetrates laterally into the solution, and there is osmotic pressure between the two phases. If the pressure in the solution phase is greater than the osmotic pressure, the water in the solution phase will penetrate in the opposite direction of the water. Reverse osmosis is used to obtain desalinated water, that is, raw water passes through the membrane to become pure water under sufficient pressure, and the concentration of dissolved and suspended matter in the water that does not pass through the membrane gradually increases.
For a specific pure water system, the long-term stability of its performance is indispensable. The success of the long-term performance of the RO system depends on normal operation and maintenance, including the commissioning of the entire system, start-up and shutdown, cleaning and maintenance, etc. The prevention of surface dirt and scale is not only considered in the design of pretreatment, but also the proper operation is critical. At the same time, the preservation of records and the daily report of RO operating parameters are very important. These data can not only reflect the actual operation of the system, but also take corrections. Reference when taking measures.
Beijing Huaxia Ping'an Water Purification Equipment Co., Ltd., national service telephone.
Second, reverse osmosis equipment water intake and environmental requirements
Power supply: 380V 50Hz
Water supply: 3.0m3 / h
Water inlet requirements:
Water inlet temperature: 5-45 ℃
Influent PH value: 3.0-10.0
Inlet SDI (15 minutes)
Influent turbidity Free residual chlorine concentration The device should be placed indoors to avoid accelerating the aging of the mechanical parts of the device.
Drainage ditch should be provided at the location of the equipment. The maximum displacement is 1.5T / H.
The location of the equipment should be equipped with lighting facilities for easy operation.
At the location of the equipment, sufficient operating space should be reserved for operation and maintenance.
The equipment should avoid contact with corrosive fumes.
Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
3. Equipment operation
Boot
1. Check the electrical appliances and pipelines to ensure that there is water in the original water tank;
2. Turn on the water source switch before the incoming solenoid valve
3. Turn on [Flushing solenoid valve / Auto], [Original water pump / Auto], [High pressure pump / Auto], [Main power / ON].
4. The system starts to run automatically
Shutdown:
Turn on [Rinse Solenoid Valve / Manual] and rinse for 2 minutes.
Hit [total power / off]
Hit ã€Flush solenoid valve / Automatic】
Manual washing of reverse osmosis membrane:
Flush: Make sure there is water in the original water tank and make up for water, open [Flush solenoid valve / manual]
Turn to [Original Water Pump / Manual] [High Pressure Pump / Manual]
Turn to ã€Original water pump / stop】 ã€High pressure pump / stop】 ã€Flush solenoid valve / stop】
Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
Reverse osmosis valve adjustment:
There are certain requirements for the flow and pressure of the reverse osmosis system. The equipment should be adjusted to the appropriate state to ensure the stable operation of the reverse osmosis system. It only needs to be adjusted once and the manual valve opening can be kept unchanged.
1. Check the electrical appliances and pipelines to ensure that there is water in the original water tank;
2. Turn on the water source switch before the incoming solenoid valve
3. Ball valve, concentrated water discharge valve, and closed return valve of the fully-open RO high-pressure pump
4. Turn on [Original Water Pump / Manual], [High Pressure Pump / Manual], [Main Power / ON].
5. The RO system starts to run
6. Adjustment of the pressure switch in front of the high-pressure pump: The pressure switch in front of the high-pressure pump mainly prevents the high-pressure pump from running and causing damage to the equipment when the incoming water pressure is insufficient. Adjust the pressure switch in front of the high-pressure pump to 0.5kg / cm2, close the valve behind the high-pressure pump appropriately, so that the high-pressure pump will not start frequently.
7. Adjust the concentrated water discharge valve (close small) reverse osmosis membrane [inlet pressure] about 0.8--1Mpa, concentrated water flow is about: 0.6m3 / h, pure water flow is about 1.5m3 / h. Adjust the return water valve so that the concentrated water flow is about: 0.6-1.0m3 / h, [inlet pressure] is about 0.8--1Mpa (when all the drainage can be used, it is recommended to close the return water valve, which is beneficial to increase the life of the membrane.
The automatic control process of the main reverse osmosis system:
Process diagram:
When the electric buttons are all in automatic mode, the device executes as follows:
When starting up, the raw water solenoid valve and flushing solenoid valve are fully opened, the high-pressure pump is opened after a delay of 5 seconds, and after 30 seconds of flushing, the flushing solenoid valve is closed and the system enters the normal water supply state.
When the system is connected to pure water high-level control (float switch), the system automatically opens the flushing solenoid valve and closes the high-pressure pump when the water is full, and closes the original water pump and inlet solenoid valve after 20 seconds of low-pressure flushing. When the original water tank has water and the pure water tank is at a low position, the original water pump, high-pressure pump and water inlet solenoid valve are automatically turned on to make water.
When the front processing system is automatically flushed or regenerated, the high-pressure pump stops and the inlet solenoid valve closes.
Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
4. Description of pre-processing operation panel
A1—inlet valve A2—outlet valve A3—backwash inlet valve A4—backwash drain valve A5—forward wash drain valve
(1) Sand filter
1. Specifications: φ400 × SS1650,
2. Quantity: 1 set
3. Material: FRP
4. Type of filter material: refined quartz sand
Function: Effectively remove suspended solids and impurities in the water and reduce the turbidity of the incoming water.
Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
Operation method: The pipe valve arrangement of the sand filter is shown in Figure 2.
(1) Running
During normal startup, first open the inlet valve A1, the forward washing drain valve A5, the inlet water flow rate is controlled at 1.0T / H, after running for 3-5 minutes, gradually open the outlet valve A2, close the forward washing drain valve A5, at this time Go to normal work.
(2) Backwash
As the running time of the pure water machine increases, the trapped dirt gradually increases, and the resistance of the water flow becomes larger. At this time, backwashing is required to restore the filtering capacity of the sand filter. First open the backwash drain valve A4 and backwash inlet valve A3, the backwash flow rate is controlled at about 1-2T / H, backwash for 5 minutes (depending on the situation of the fouling), and the debris, Bubbles burst out until the water is clear.
(3) Washing
After backwashing, it needs to be washed forward. Open the inlet valve A1 and the forward washing drain valve A5 to control the flow rate of 1T / H. Washing until the effluent is clear and the water quality is qualified (about 3 ~ 4 minutes). Open the outlet valve A2 and close the forward washing and drain valve A5, and turn into normal working state.
(2) Carbon filter
1. Specifications: φ400 × SS1650,
2. Quantity: 1 set
3. Material: FRP
4. Type of filter material: water purification grade coconut shell activated carbon
Function: Effectively remove organic matter and residual chlorine in water.
Operation method: The arrangement of the pipe valve of the carbon filter is shown in the above figure. The operation method is the same as sand filter.
Fifth, pre-treatment rinse cycle setting:
Sand column: once a day
Charcoal column: once every 3 days
Filter replacement: depending on the pollution, generally 1-2 weeks.
Daily replacement of 5μm PP filter and carbon core:
In order to ensure the normal operation of the reverse osmosis system and extend the service life of the RO membrane, this system uses a PP filter element with a pore size of 5 μm, which has the characteristics of high filtration accuracy and long service life. The replacement cycle depends on the water quality. Generally, the replacement condition is that the filter element is seriously polluted on a large area, and becomes black and yellow.
The service life of the filter element is directly related to the operation status of the pretreatment equipment. The good operation of the pretreatment equipment can remove most of the solid particles and flocculent precipitates, organic matter, etc., reducing the load of the microfilter and extending the service life of the filter element.
The filter element should be replaced regularly to ensure its retention effect, otherwise it may cause irreparable damage to the RO membrane.
Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
Replacement method:
1. Use a wrench to unscrew the filter housing
2. Take out the old filter
3. Insert the new filter element, pay attention to put the "O" seal ring, the filter element is at the center of the filter shell, so that the filter shell waterline seals it.
4. Tighten the filter housing with a wrench.
6. Maintenance and maintenance of reverse osmosis device
1. After each shift is completed, the reverse osmosis components should be rinsed protectively for 20 minutes.
2. As the operating time increases, deposits will adhere to the surface of the membrane, affecting the amount of water permeable, and it is necessary to clean the RO components regularly. According to different pollution conditions, targeted treatment.
3. The high-pressure pump should be checked and maintained frequently, and the lubricant should be replaced in time according to the requirements of the equipment manual.
4. Periodically inspect and check the conductivity meter and each pressure gauge to make it work normally and accurately.
5. The RO device shuts down for a short period of time (not more than 3 days), and can be flushed with low-pressure water from the security filter for 0.5 hours every day, and ensure that the components are filled with water.
6.If the RO device is shut down for a long time (> 3 days), the 1% formaldehyde solution should be used to fill the RO components, and then all valves should be closed, and checked once a month.In summer, the ambient temperature should be controlled to prevent mildew and winter frost, necessary When adding 10-20% glycerin.
It is best to use fresh water for reverse osmosis for storage water and chemical reagent products for formaldehyde
When the reverse osmosis system composed of composite membranes is to be suspended for more than one week, the system should be soaked with 1% NaHSO3 solution to prevent bacteria from multiplying on the membrane surface.
Technical information provided by Beijing Huaxia Pingan Water Purification Equipment Co., Ltd. 400-040-0510
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Beijing Huaxia Ping'an Water Purification Equipment Co., Ltd. is a comprehensive high-tech production and assembly enterprise integrating R & D, design, manufacturing and sales of water treatment equipment. The company's main products are divided into: reverse osmosis equipment, purified water equipment, mineral water equipment , Softened water equipment, industrial water treatment equipment, domestic water treatment equipment, direct drinking water equipment, direct drinking machine, community direct drinking water station, automatic water vending machine, central water system, barreled water filling equipment, water treatment accessories class.
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