One decade and still running strong

The WINGOC (Windhoek Goreangab Operating Company) consortium is celebrating the ten-year anniversary of the opening of the New Goreangab Water Reclamation plant in Windhoek, which has been re-using the city's water since 2001.

Forming the consortium, Veolia Water AMI, Berlinwasser International and VA-Tech Wabag have been responsible for the operation and maintenance of the Goreangab plant - which is a high-tech waste water treatment and processing facility directing water into the Windhoek potable drinking water system.

"Some of the challenges we faced since the plant became operational have included the need to react to the dynamic quality of semi-purified intake water," says Gunter Rencken, Managing Director, Veolia Water Solutions & Technologies South Africa. "We improved the sampling, analysis, and operation optimisation methods, which helped us to meet our contractual targets regarding water output quality."

The plant purifies wastewater and semi-purified sewage for direct potable re-use through the Windhoek drinking water system. This pioneering project is the only one worldwide that provides potable water commercially on such a large scale, which is remarkable, considering Namibia is comprised of 80% desert and semi-desert.

Maintenance, carried out since 2001, has included work on the main pump sets, the replacement of membranes, VSDs (variable speed drives), and the related control systems. "This maintenance is intended to ensure that the treatment plant continues to produce potable water with the possibility of incorporating future technological advancements into the designs, as newer technologies have already seen the output water quality improve," says Rencken.

Currently, the plant employs 24 technicians, maintenance engineers, process engineers, and laboratory assistants who ensure smooth operation and constant water quality.

The plant features an output capacity of 21 000 m3 per day and provides up to a third of the city's total potable water supply - serving almost 300 000 people.