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produce high-quality drinking water from feed water of various qualities using a range of technologies. These water treatment technologies include:
- Organisms used in water purification
- Supercritical water oxidation(SCWO)
- NERV (natural endogenous respiration vessel)
- Ion exchange
- Hydrex™ chemicals
- Treatment pond
- Upflow anaerobic sludge blanket digestion
- Cross-flow filtration
- Decentralized wastewater system
- Chemical addition wastewater treatment
Since the company’s beginnings in 1853, Veolia has used leading water treatment technologies to meet its objectives of supplying safe drinking water to towns and cities across the world. The company’s water treatment technologies can be supplied as a complete turnkey water solution, or retrofitted to upgrade an existing water treatment train.
Through cutting-edge water treatment technologies, Veolia Water Technologies South Africa is enhancing the performance and safety of drinking water treatment plants in Southern Africa.
Empty aeration tank for iron precipitation
Tanks with sand filters to remove precipitated iron (not working at the time)
A combination selected from the following processes is used for municipal drinking water treatment worldwide:
- Pre-chlorination for algae control and arresting biological growth
- Aeration along with pre-chlorination for removal of dissolved iron when present with small amounts relatively of manganese
- Coagulation for flocculation or slow-sand filtration
- Coagulant aids, also known as polyelectrolytes – to improve coagulation and for more robust floc formation
- Sedimentation for solids separation that is removal of suspended solids trapped in the floc
- Filtration to remove particles from water either by passage through a sand bed that can be washed and reused or by passage through a purpose designed filter that may be washable.
- Disinfection for killing bacteria viruses and other pathogens.
Technologies for potable water and other uses are well developed, and generalized designs are available from which treatment processes can be selected for pilot testing on the specific source water. In addition, a number of private companies provide patented technological solutions for treatment of specific contaminants. Automation of water and waste-water treatment is common in the developed world. Source water quality through the seasons, scale and environmental impact can dictate capital costs and operating costs. End use of the treated water dictates the necessary quality monitoring technologies, and locally available skills typically dictate the level of automation adopted.
|Turbidity and particles||Coagulation/ flocculation, sedimentation, granular filtration|
|Major dissolved inorganics||Softening, aeration, membranes|
|Minor dissolved inorganics||Membranes|
|Pathogens||Sedimentation, filtration, disinfection|
|Major dissolved organics||Membranes, adsorption|