RO reverse osmosis system 50T/H

Product details:

RO is the process of passing a portion of the raw water through the membrane in a direction perpendicular to the membrane. Salts and colloidal substances in the water will be concentrated on the surface of the membrane, while the remaining portion of the raw water will be carried away in a direction parallel to the membrane and self cleaned during operation. The higher the water flux and recovery rate of the membrane element, the higher the degree of concentration on its membrane surface. Due to the concentration effect, the solubility of substances on the membrane surface is different from the concentration of substances in the main water flow, resulting in concentration polarization phenomenon. Concentration polarization can increase the concentration of salt on the membrane surface, increase the osmotic pressure of the membrane, cause an increase in salt permeability, and require more energy to increase the pressure of the feedwater. In this case, cleaning should be used for recovery.

1、 Structural form:

The reverse osmosis device consists of composite membrane elements, fiberglass pressure vessels, carbon steel slides, and instrument control cabinets. The instrument control cabinet is equipped with various instruments such as conductivity, flow, pressure, etc., making it easy for users to detect and automate the operation of the device at any time.

2、 Performance parameter table:

1. Performance parameter table

Note: The actual desalination rate may vary depending on the salt content of the raw water and the specific water quality.

2. In order to ensure the safe and normal operation of the reverse osmosis device, the raw water entering the device should be treated and adjusted appropriately to achieve the following indicators:

3、 Device installation:

The installation of reverse osmosis devices must be carried out according to the following conditions:

After the device is transported to the site, it should be placed indoors with a minimum ambient temperature of 5 ℃ and a maximum ambient temperature of 38 ℃. When the temperature exceeds 35 ℃, ventilation measures should be strengthened.

After the device arrives, it should be installed within one month and immediately undergo a water test run.

Before conducting a water test on the device, no valve should be opened to prevent the protective solution from flowing out and causing damage to the components.

After the device is in place, the support points of the device should be adjusted to ensure that the components are in a basic horizontal position and have reliable contact with the foundation.

5. The pipelines and valves connecting the device to the water supply pump should be degreased before connection, and the overcurrent part of the water supply pump should also be degreased.

The maximum output height of the water output pipe of the device should be less than 8 meters.

Note: Points 2 and 3 are only applicable to devices with membrane components installed in the RO device.

4、 Debugging steps:

1. Analyze and test the water inlet of the device, and only when the results show that it meets the water inlet requirements, can the device be debugged for water supply.

2. Adjust the pressure control of the water supply pump and the automatic water quality monitoring system.

3. Check whether the connections between all pipelines of the device are complete, whether the pressure gauges are complete, whether the low-pressure pipeline connections are tight, and whether there are any shortages.

4. Open the discharge valve before the pump, start the pre-treatment equipment, and adjust the water supply to be greater than the inlet water of the device.

5. Fully open all pressure gauge switches, inlet valves, concentration discharge valves, and production water discharge valves.

6. Close the discharge valve before the pump, and after the component is filled with water, close the inlet valve of the device.

7. When the inlet pressure of the high-pressure pump is greater than 0.2 MPa, start the high-pressure pump and slowly open the inlet valve of the device while closing the concentrated discharge valve. Control the total pressure difference of the device to be less than 0.3 MPa. After discharging the produced water for 2 minutes, close the production and discharge valve and run for 15 minutes. Check whether the high and low pressure pipelines and instruments are working normally.

8. Adjust the inlet valve and concentrated water outlet valve to make the ratio of produced water to concentrated water 3:1.

9. Test the conductivity of the product water. When it meets the requirements, first open the product water outlet valve, and then close the product water discharge valve.

10. Precautions for debugging process:

During the debugging process of 10-1, the inlet water pressure shall not exceed 1.5MPa.

If the inlet water temperature is higher or lower than 25 ℃, it should be corrected according to the water temperature water production curve, and the recovery rate should be controlled at 75%.

After continuous operation for 4 hours, if the desalination rate of the 10-3 device cannot reach the designed removal rate, the desalination rate of each component in the device should be checked one by one, and the faulty component should be replaced after identifying it.

When water leakage is found in the high-pressure pipeline and needs to be eliminated, the device should be depressurized and it is strictly prohibited to loosen the high-pressure joint under high pressure conditions.

5、 Operation and management of the device:

1. Strictly control the incoming water quality to ensure that the device operates under water quality conditions that meet the requirements of the incoming water indicators.

2. When controlling the operating pressure, the lowest possible pressure value should be taken while meeting the requirements of water production and quality. This is beneficial for reducing the water flux attenuation of the membrane and decreasing the membrane replacement rate.

3. For inlet water temperature control, the minimum temperature that cannot meet the requirements of water production and quality should be taken as the inlet water temperature during this time period based on the actual water consumption, taking the boundary pressure (the pressure value below which the desalination rate decreases significantly). This can reduce the attenuation of membrane water volume.

4. Emission control: Due to changes in factors such as water temperature and operating pressure, the water production of the device also changes accordingly. In this case, the emission should be adjusted to control the ratio between the emission and water production to 1:2.5-1:3, otherwise it will affect the desalination rate of the device.

5. Operational measures for high water temperature in summer:

5-1 Reduce operating pressure while ensuring the required salt content in the influent for post-treatment. Implement decompression operation. This strategy is the preferred strategy.

5-2 According to the water supply requirements, reverse osmosis should be shut down alternately (limited to factories with two or more reverse osmosis units installed), but the shutdown time should not exceed 24 hours (in summer), otherwise it may cause bacterial growth on the membrane surface and increase pressure drop.

6. The device shall not be shut down for a long time and shall operate for at least 2 hours per day. If preparing to shut down for more than 72 hours, use a chemical cleaning device to fill the components with 1% sodium bisulfite and 18% glycerol for protection.

8. During each shutdown and start-up of reverse osmosis, the device should be flushed for 15 minutes under the condition that the inlet pressure is less than 0.4 MPa.

9. The operator should record the operating parameters every 2 hours, including:

Inlet water: pH value, conductivity, pressure SDI、 Water temperature.

Water production: conductivity, flow rate PH。

Concentrated water: flow rate, pressure. And the inlet pressure of each section.

10. It is strictly prohibited for untrained personnel to operate on duty.

6、 Fault analysis and troubleshooting methods:

１. Abnormal operation of the device and countermeasures

２. Abnormalities and Countermeasures of Reverse Osmosis Components:

３. Symptoms and countermeasures after RO component contamination:

4. Cleaning formula:

5. Conditions and precautions for cleaning reverse osmosis:

If any of the following situations occur during the operation of the 5-1 device, chemical cleaning must be carried out immediately. Under standard conditions, with a pressure of 1.5 MPa, a water temperature of 25 ℃, and a recovery rate of 75%.

(a) When the total pressure difference of the device increases by 0.15-0.2MPa compared to the initial operation.

(b) When the desalination rate of the device decreased by three percentage points compared to the last cleaning.

(c) When the total water production of the device has decreased by more than 10% compared to the last cleaning.

(d) Even if the above three situations have not occurred, it is usually recommended to clean once every 3-6 months.

5-2 Precautions:

(a) During cleaning, acid washing formula is used to remove CaCO3 scale and heavy metal pollution, while alkaline washing formula is used to remove organic pollution.

(b) The maximum temperature of the cleaning solution is 30 ℃, the maximum pressure is 3.5Kg/Cm2, and each cleaning period is 45 minutes. Prepare the solution with reverse osmosis water or deionized water, and mix the solution evenly.

(c) After cleaning according to the prescribed time, rinse with filtered water from a security filter (5 microns). The flushing time is generally 30-60 minutes, and the reverse osmosis outlet water should be emptied and discharged.

(d) After confirming the flushing, it is best to immediately put it into normal operation. The time from chemical cleaning to resuming operation should not exceed one day.

6. Cleaning method:

6-1 Clean the first section, remove the tube plugs from each cleaning reflux port, replace the tube fittings, and close the concentrated water outlet valve;

6-2 Open the outlet valve of the cleaning pump, start the cleaning pump, and adjust the reflux valve of the cleaning pump to an output flow rate of 80 m3/h (for the cleaned component), with a pressure gauge pressure not exceeding 0.4 MPa. Cycle for 45 minutes and the cleaning temperature not exceeding 30 ℃.

Clean the second section 6-3 and close the main reflux port of the first section cleaning solution.

6-4 Repeat action 6.2.

After the 6-5 cleaning is completed, all valves should be put into normal operation, the concentrated water and product water discharge valves should be opened, and all valves of the cleaning device should be closed.

Perform low-pressure flushing on device 6-6.

7、 Sealing method of membrane:

7-1 Use a cleaning device to prepare a preservation solution for the membrane.

7-2 Close the concentrated water outlet valve. Open the inlet and outlet valves of the cleaning solution, and open the outlet valve of the cleaning permeate.

The operation steps for 7-3 are the same as 6.2, but the total pressure difference of the device for cleaning the pump flow is limited to no more than 0.4 MPa.

8、 Precautions for disassembly and assembly of components:

1. Remove the component from the opposite direction of the water inlet. When removing, the component must be pulled out in parallel and must not be shaken left or right.

2. When installing components, they should be installed from the water inlet direction and pushed in evenly with force. Hard objects should not be forcefully knocked in.

3. The disassembled components should be immediately immersed vertically in the storage solution and must not be left dry in the air

9、 Preservation of membrane

Scope of application:

1. Short term storage of reverse osmosis membrane components installed in pressure vessels;

2. Long term storage of reverse osmosis membrane components installed in pressure vessels;

3. Dry storage of reverse osmosis membrane components as spare parts and membrane storage before starting the reverse osmosis system.

Short term storage:

The short-term storage method is suitable for reverse osmosis systems that have been out of operation for more than 5 days but less than 30 days. At this time, the reverse osmosis membrane element is still installed in the pressure vessel of the RO system. The specific steps are as follows:

1. Rinse the reverse osmosis system with water while ensuring complete removal of gas from the system;

2. After filling the pressure vessel and related pipelines with water, close the relevant valves to prevent gas from entering the system;

3. Rinse every 5 days according to the above method.

Long term disuse protection

Suitable for reverse osmosis systems that have been out of operation for more than 30 days and still have membrane components installed in pressure vessels. The specific steps for protecting operations are as follows:

1. Cleaning membrane components in the system;

2. Prepare a disinfectant solution using reverse osmosis water (recommended to use 1% sodium bisulfite) and keep it in the system, ensuring that the system is completely filled.

3. If the system temperature is below 27 ℃, perform 2-3 refills with new disinfectant every 30 days; If the system temperature is higher than 27 ℃, the protective solution (disinfectant) should be replaced every 15 days.

4. Before putting the reverse osmosis system back into use, rinse the system with low-pressure water for one hour. Before restoring the system to normal operation, check and confirm that the product water does not contain any sterilizing agents.

Preservation of membrane components before system installation:

When the membrane components leave the factory, they are vacuum sealed in plastic bags containing protective liquid. Membrane components should be stored in a dry and ventilated environment before installation and transportation to the site, with a suitable storage temperature of 20-35 ℃. Membrane components should be protected from direct sunlight and avoid contact with oxidizing gases.