Veolia was contracted by Lepelle Northern Water Board to augment its existing water supply from its Politsi Water Treatment Plant. Although producing 5.5 MLD high-quality potable water from turbid raw water, Politsi was unable to meet the growing water demands of the surrounding communities. In addition, the Plant was facing drastic onsite space-constraints and unable to expand its existing treatment plant by conventional process.
Veolia, therefore, was contracted to design and build a fully-containerised water treatment plant that is capable of supplying 5 MLD of potable water, increasing the overall water supply to 10.5 MLD for the villages.
To do this, Veolia utilised its tried-and-tested prefabricated clarification and pressurised filtration technology together with a range of chemicals. “In this process, raw water is fed through a pump station (by others) to the packaged clarifiers where it’s dosed with polymers and coagulants to enhance flocculation and coagulation,” says Thabo Mogadima, Business Development Manager (Municipal), Veolia South Africa.
This chemically-dosed raw water will enter the clarifier, where the floc particles, which resulted from the flocculation and coagulation process, will settle in the clarifier “This is followed by pressurised sand filtration process and finally is disinfected using hydrochloride acid,” adds Mogadima. In addition, Veolia will utilise pH correction chemicals to correctly adjust the pH level to comply with SANS 241-1:2011. This treated water is then combined with the 5.5 MLD produced from the existing plant in an underground reservoir from where it’s pumped to the villages.
“Our packaged plants offer rugged, low maintenance performance and are particularly suited to remote locations such as this one,” adds Mogadima. “The low footprint plant was also pre-assembled at our Sebenza workshop and simply needed to be mounted on a concrete slab, ’plugged in and switched on’ when it arrived on site in February this year.”
Understanding the importance of community involvement in addressing municipal issues, Veolia will also conduct onsite training for the municipality as well as offer 12-month ‘on-call’ response time to problems that may arise at the plant.