Abstract
At present, most of the source water of domestic urban water supply treatment plants is taken from micro-polluted surface water. With the further improvement of drinking water sanitation standards, the traditional “coagulation-sedimentation-filtration-disinfection” process cannot meet the requirements of the new standards. Ultrafiltration, as the core technology in the field of water treatment in the 21st century, is increasingly applied to water treatment due to its advantages of green efficiency, simple operation, small footprint, and high degree of automation. However, the use of ultrafiltration membrane alone has some problems such as substandard water quality and serious membrane pollution. Therefore, the combination of ultrafiltration and traditional water treatment technology to treat micro-polluted surface water has become the mainstream choice for treatment plants. This article mainly introduces the current research status of domestic ultrafiltration combined technology, trying to explore more reasonable and effective ways to apply ultrafiltration membranes in actual projects.
Highlights
Intermediate blockage model, n=1: As the water flow reaches the membrane surface, the particulate matter can be deposited at any position on the membrane surface, including unblocked membrane pores and deposited particles, allowing overlapping accumulation
Peldszus S, Huck PM et al [16,17] studied the impact of fast biofilters on ultrafiltration membrane fouling, and the results showed that pretreatment of biofilters can remove part of the biopolymers, delay the growth rate of irreversible pollution, and the longer contact time, the more significant effect, this green pretreatment process is suitable for small water treatment systems
Ultrafiltration membranes will occupy a more important position in water supply treatment
Summary
Micro-polluted surface water contains suspended particulate matter, colloidal matter, algae, organic matter and bacteria and other microorganisms. These substances have different physical and chemical properties such as particle size, molecular weight, hydrophobicity, and chargeability. In the process of membrane separation, impurities in water form a concentration gradient on the membrane surface, and form a stable concentration polarization boundary layer, and a filter cake layer. N=2: all particles reaching the membrane surface completely block a membrane pore during the filtration process. Intermediate blockage model, n=1: As the water flow reaches the membrane surface, the particulate matter can be deposited at any position on the membrane surface, including unblocked membrane pores and deposited particles, allowing overlapping accumulation.
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