Long-term evaluation of a UF pilot plant for potable water production

Botes J.P. ; Jacobs E.P. ; Bradshaw S.M. (1998)

Article

The results of a 15 m2 low-pressure capillary membrane UF pilot investigation are presented. The plant has been operating for 20 000 h using the same set of prototype membrane modules, and continues to produce 10-15 m3/D of high-quality potable water. Sub-standard surface water from the Theewaterskloof impoundment, normally used for irrigation, was supplied as the feed to the plant. The membrane filtration system removes >95% turbidity, 92-97% apparent colour, 97-99% iron, and 60-85% natural organic matter. All faecal and other coliform bacteria are also removed while the heterotrophic plate count is reduced to an acceptable level. A 15-20% average specific flux loss was observed, and the membrane life is estimated to be >5 years.The results of a 15 m2 low-pressure capillary membrane UF pilot investigation are presented. The plant has been operating for 20,000 h using the same set of prototype membrane modules, and continues to produce 10-15 m3/D of high-quality potable water. Sub-standard surface water from the Theewaterskloof impoundment, normally used for irrigation, was supplied as the feed to the plant. The membrane filtration system removes >95% turbidity, 92-97% apparent colour, 97-99% iron, and 60-85% natural organic matter. All faecal and other coliform bacteria are also removed while the heterotrophic plate count is reduced to an acceptable level. A 15-20% average specific flux loss was observed, and the membrane life is estimated to be >5 years.

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