Timely hydraulic and chemical flushing:
The frequency of membrane maintenance depends on the operating conditions of the system and the quality of the source water.
Hydraulic flushing provides a mechanical effect on the membrane during which precipitation lags behind its surface and is discharged into the sewer. Typical methods may include direct and reverse rinsing with a stream of water with high pressure, vibration, adding air to loosen the deposits.
Chemical washing involves the use of surface-active agents, alkalis, acids, antiscalants, which are able to dissolve and wash off deposits. The chemistry for the membranes is selected according to the type of contamination of the membrane element, taking into account the safety of the reagents for the membrane material and equipment.
3. Dosing of reagents:
To prevent the formation of colloidal and salt deposits, antiscalants are used – substances that can disperse colloidal impurities. As for biological fouling, here you will need non-oxidizing disinfectants with good bactericidal, fungicidal and algicidal action.
4. Design features:
Often, fowling can be prevented by simple solutions in the parameters of the technological mode or design.
Important factors to consider when designing membrane systems are:
- the correct choice of membrane material depending on the composition of the water;
- the correct pore size – membrane installations should be selected not only in terms of the quality of the water obtained, but also from the quality of the source;
- optimization of operating parameters;
- control of temperature, pH, source water temperature.
Signs of Fowling:
If you observe sharp or smooth jumps in the pressure drop across the membrane, this indicates a deterioration in the quality of the source water or about fowling.
Reduced water quality:
If a high level of TDS is observed at the outlet of the membrane element, sometimes with a decrease in permeate yield, the cause is most often membrane contamination. Less commonly, this may be a sign of poor quality water pre-treatment. Therefore, it is worth checking the composition of effluents – if they contain a large number of mechanical particles, it is most likely necessary to improve the pretreatment by water filtration plant.
If a poor level of salt removal is accompanied by a pressure drop, then there is a likelihood of scaling, which may require more frequent chemical flushing, dosing of antiscalants, etc
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