Panel Discussion on Raw Water Treatment, Water & Sanitation Africa Magazine – May/June 2017


De Doorns Valley Water Reuse plant

What are some of the biggest challenges in raw water treatment to potable standards?

HS Conventional technologies, in some cases, are not sufficient to produce potable water quality, as a result of diminishing raw water quality in South Africa’s water sources. The identification of contaminants and water characterisation are critical to determine the raw water treatment requirements. Microbiological contamination assessments identified protozoa contamination as a new danger in raw water, as Giardia and Cryptosporidium can pass through a sand filter and are also resilient against chlorine disinfection.

How does QFS’ technology overcome these challenges?

QFS offers ultrafiltration as a mechanical barrier down to 0.04 micron for the Log 6 removal of Giardia and Cryptosporidium.  The effectiveness of the ultrafiltration membranes to remove suspended solids and microorganisms assists in better downstream disinfection by chlorine.

Can you provide an example of a client who used this technology?

Treated municipal wastewater requires a stringent tertiary filtration process to guarantee water safety for reuse applications. The provision of an integrity-testable ultrafiltration membrane ensures the quality of the final filtered water.  In the last 12 months,  QFS has provided two ultrafiltration skids for this application, at 3 Ml/day and 1.5 Ml/day plants.




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