Precautions for the operation of Ultra-filtration system

I. The principle of ultra-filtration system

Hollow fiber ultra-filtration membrane is an important membrane separation technology. It is characterized by separation at room temperature and low pressure. It has the advantages of low energy consumption, high filtration accuracy, large water production, and strong anti-fouling ability. It can effectively remove Bacteria, colloids, suspended solids, rust, macro-molecular organic matter and other harmful substances, but cannot be desalinated.

II. Performance characteristics of ultra-filtration system

1. High filtration accuracy, ultra-filtration filtration pore size in the range of 0.001-0.1m, effectively filtering out harmful substances such as bacteria, colloids, suspended solids, rust, and macro-molecular organics in the water. Significantly reduce COD, SS, SDI and turbidity, etc., to ensure that the effluent is stable and up to standard.

2. If ultra-filtration effluent is used as reverse osmosis inlet water, the cleaning cycle and life of the reverse osmosis membrane can be prolonged, and the water production can be increased.

3. Fully automatic control of system operation.

4. Compact structure and small footprint.

5. Low operating pressure and low operating cost.

6. The operation is simple, safe and easy to maintain.

III. Operation precautions of ultra-filtration system

1. The designed water production volume of the ultra-filtration system is usually measured under the conditions of 25℃ water temperature and standard pressure. If the water temperature rises or falls, the water production also increases or decreases. When the water temperature drops by 1℃, the water production drops by 2.13%. The opposite is true when the temperature rises.

2. The ultra-filtration membrane is best installed indoors to avoid sun and rain.

3. When the ultra-filtration system is working normally, the value of the inlet pressure gauge is 0.1-0.3Mpa, and the pressure cannot be arbitrarily increased to increase the water volume, otherwise the membrane elements will be damaged. The pressure value can be adjusted by the ultra-filtration water inlet butterfly valve.

4. Before starting the machine, please make sure that the valves are in the correct position. The booster pump can be turned on after the inlet valve is closed, otherwise the pressure gauge and ultra-filtration membrane may be damaged. After turning on the raw water pump, adjust the inlet valve to the inlet pressure. It is 0.1-0.3Mpa.

5. When the ultra-filtration membrane is started for the first time, use low-pressure, low-flow inlet water to drive away the air in the membrane module. The inlet pressure should be as low as possible. Water should be fed from the bottom of the membrane to flush all the produced water and concentrated water during the process. Both should be discharged; every subsequent start and stop will involve sudden changes in system pressure and flow, impact on membrane modules, etc. Therefore, the number of start and stop of system equipment should be minimized, and the normal start and stop process should also It should be as stable as possible, especially the rise of inlet water pressure and flow rate should be slow;

6. If the ultra-filtration inlet pressure is higher than 0.3Mpa, the inlet water quality fluctuates greatly, or the ultra-filtration produced water quality does not meet the standard, stop the machine and check the reason.

7. When the trans-membrane pressure difference of the ultra-filtration membrane Δp≤0.2MPa, the series runs normally, and when the trans-membrane pressure difference Δp>0.2Mpa, it means that the membrane is blocked seriously and needs to be shut down for treatment (chemical cleaning).

8. After the system shuts down, follow the following treatments:

1) Prevent the membrane from drying out due to loss of water. After the membrane loses water, there will be an irreversible drop in water production;

2) Use appropriate protective measures to prevent the growth of microorganisms or perform regular flushing every 24 hours;

3) When not in use for a long time (more than 5 days), please fill the ultra-filtration membrane with a protective solution for storage to prevent the loss of water from the ultra-filtration membrane and cause a drop in water production. The formula in the protection solution: (1% sodium metabisulfite + 10% propylene glycol protection solution + 89% RO reverse osmosis water or ultrafiltration water).

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