Microfiltration process is one of the most useful processes to remove particle in raw water. But, it is needed to recover TMP using chemical cleaning when membrane fouling occurs. Therefore, it is very important to control membrane fouling. It is required to present a stable operating method in microfiltration inflowing high turbidity and organic matters. In this study, controlling method of organic and inorganic membrane fouling was evaluated by physical and chemical methods.
A 100 m3/day mobile water treatment plant was operated. It was divided to two lines according to whether including DAF process or not including. Raw water was high turbidity and included organic matter.
Membrane fouling occurred rapidly between A and B section in both lines. After base chemical cleaning, 92% of TMP was recovered. Therefore, organic matters were the major cause of membrane fouling. After chemical cleaning, 10 mg/L NaOCl was injected during backwashing in C and D section. After injection, long term operation was possible. Therefore, it was possible to control organic membrane fouling using NaOCl.
Increasing TMP of line 1 was about 0.2 kg/cm2 and increasing TMP of line 2 was about 0.75 kg/cm2. Particles were removed floating by DAF process in line 1. Therefore, it was possible to control membrane fouling in microfiltration using DAF process inflowing high turbidity.
It is possible to control membrane fouling using DAF Process inflowing high-turbidity water and control organic membrane fouling using chemically enhanced backwash.