The City of Cape Town (CoCT) is investing R280-million to upgrade its Wildevoëlvlei wastewater treatment works (WWTW) in Kommetjie.

Constructed in 1977, the Wildevoëlvlei WWTW services Fish Hoek, Kommetjie, Noordhoek, Ocean View and Masiphumelele, with a maximum capacity of 14.5 ML/d.

The facility’s first upgrade in 1999 increased capacity from 7.5 ML/ to the current 14.5 ML/d.

The plant employs eight permanent and three Expanded Public Works Programme staff.

The facility uses a conventional activated sludge system, where the preliminary treatment involves screening and de-gritting to remove large foreign material and trash, as well as stones, grit and sand.

The secondary treatment process revolves around a biological reactor and carouse to break down the organic matter, as well as nitrogen and phosphorus in the sewage.

This is followed by the sludge handling/dewatering phase, which enables the sludge to be disposed of offsite safely.

The treated effluent processed at the plant flows into the Wildevoëlvlei, which drains into the ocean via Kommetjie Beach.

The current refurbishment includes a new, larger-capacity dewatering facility featuring the latest mechanical equipment.

This is scheduled for commissioning by November next year.

The upgrade also involves refurbishing existing mechanical equipment, such as mixers and aeration systems, to enhance biological treatment efficiency.

These improvements should increase operating capacity, boost operational efficiency and improve effluent quality.

Plans are also in place for a treated effluent pump station valued at R40.4-million, with construction expected to start early next year.

This facility will improve access to treated effluent in Kommetjie and neighbouring areas.

Full project completion is expected by April 2027.

A further capacity upgrade at the treatment works is planned for 2032, with planning and design work already under way.

“The city is committed to investing in its wastewater treatment plants,” says CoCT Water and Sanitation MMC Zahid Badroodien.

“This facility was earmarked for upgrades due to ageing infrastructure.

“Six months into the upgrade, progress is on track, and these improvements will ultimately enhance treated effluent quality and organic load control. We look forward to seeing the work completed next year.”