Water&Sanitation Africa July/August 2020

Page 42

TREATMENT

Ozone: a powerful alternative Ozone is an incredibly powerful disinfectant – many times more effective than even chlorine, one of the most widely used chemical disinfectants in the water space.

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hlorine and other chemical disinfectants have long been popular for their price/performance ratio. However, ozone has proved to be a highly effective and useful alternative, treating numerous types of bacteria and other organisms. On its own, ozone is a potent yet environmentally friendly disinfectant agent that outshines other choices. When using treatments that combine ozone’s immediate effects with long-term

disinfectants, the results and savings can be significant. “Ozone doesn’t last long, and it leaves no chemical residual,” explains Brendan van Wyk, business development manager, Xylem. “If we were to disinfect a room with ozone, it would be hazardous to be in that environment during the procedure. But after about 20 minutes, it would be perfectly safe to re-enter the room, with little or no trace of any ozone being detected. This is because ozone (O3) is very unstable and reverts back to oxygen (O2).” This view is backed by research, such as trials undertaken in 2014 by Campden BRI. It found that “ozone at


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Flumes & Weirs

3min
pages 52-53

Raising Garden Route Dam

4min
pages 50-51

Pipes, Pumps & Valves

3min
page 39

Dams & Reservoirs

2min
pages 48-49

Treatment

4min
pages 42-43

Massive magnetic flow meter delivered

4min
pages 40-41

Stormwater

4min
pages 46-47

South Africa: before, during and after Covid-19

7min
pages 36-38

Sanitation

5min
pages 44-45

Web platform addresses Covid-19 challenges

3min
pages 34-35

Water Supply

4min
pages 32-33

Tailings management aims to progress despite headwinds

5min
pages 24-25

A water-driven approach

7min
pages 26-28

The story of Nelson Mandela Bay’s bulk water maintenance

8min
pages 29-31

SA joins fight for Human Right 2 W ater

3min
pages 22-23

Non-revenue Water

5min
pages 16-17

News

6min
pages 14-15

Water Security

4min
pages 18-19

Regulars

4min
pages 5-6

WISA

3min
page 7

YWP

4min
pages 12-13

Africa round-up

5min
pages 10-11

Chair’s comment

4min
pages 8-9
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