ERWAT
East Rand Water Care Company

A truly indigenous South African wastewater company providing bulk wastewater conveyance and a highly technical and proficient wastewater treatment service to some 2 000 industries and more than 3,5 million people.


Provision and maintenance of process control systems


Advanced chemical and bacteriological laboratory services


Research and development in water-related areas


Industry-specific training in both the scientific and operating fields

Physical Address: Ceramic Road, Olifantsfontein

The Olifantsfontein works, situated in the northern Drainage District (DD3), serves the majority of the communities and industries in Tembisa, Olifantsfontein and Ivory Park, as well as sections of Kempton Park and Midrand. It is designed to treat some 105 megalitres of wastewater per day.

The original phase 1 of the works, based on the conventional biological filtration process, was built in 1972 to treat an inflow of 4.5 megalitres per day. The works was expanded in 1976 to a treatment capacity of 9 megalitres per day.

An increase in flow and loading resulted in a further expansion (phase 2) to the to a capacity of 38 megalitres per day in 1985, based on an integrated biological filtration and activated sludge process. The economic and industrial growth in the district resulted in the construction and commissioning of the 70 megalitres per day phase 3 extension by ERWAT in 1995, equipped with a semi-automatic process control via a Supervisory Control And Data Acquisition (SCADA) system.

The phase 3 works consists of a mirrored system, with two identical 35 megalitres per day. Biological Nutrient Removal (BNR) process units, incorporating common preliminary and tertiary treatment units. The preliminary treatment includes screening in three sets of double screens and degritting in three vortex degritters, as well as automated screenings dewatering and grit classification. After flow measurement and division, primary treatment takes place in two in-line prefermenter primary settling tanks (36 m diameter). The settled sewage is treated in two 25000 m3 BNR reactors, designed as 3rd stage Bardenpho configurations, with flexibility to allow custom processes such as the University of Cape Town (UCT) or Modified UCT arrangements. A standby chemical phosphate removal dosing system is available to ensure nutrient removal can be accomplished continuously. Each reactor contains eight mixers (11 kW) and sixteen dual speed surface aerators (110 kW). Biomass settling, recirculation and final clarification take place in four secondary settling tanks (38 m diameter). Final effluent chlorination takes place in a flash mixer, after which a 3-leg contact basin (2200 m3) provides the required disinfection contact time. The disinfected effluent discharges into the Kaalspruit, which eventually flows to the Hartebeestpoort Dam.

Primary sludge is treated in four 2750 m3 anaerobic digesters before dewatering. Waste activated sludge is thickened in two Dissolved Air Flotation (DAF) units, before it is combined with the digested primary sludge for conditioning and final dewatering in three Filter Belt Presses (FBP). The dewatered sludge is used for agricultural land application.

The works is designed to contain and recover all waste liquid process water on-site, with a network of internal recirculation systems to allow for retreatment.

Capacity : 105.00 Mℓ/d

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News/Events

ERWAT welcomes new Managing Director

Mr Tumelo Gopane recently joined ERWAT as Managing Director.

“I am honored to have been appointed as ERWAT’s Managing Director. It is a privilege to be part of an organization that delivers high quality services and innovative solutions to its clients and that continuously pursues excellence in the water sector”, says Gopane.

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Important information for suppliers and vendors

NOTICE TO ALL BIDDERS AND POTENTIAL ENTRANTS TO ERWAT’S SUPPLIER DATABASE

National Treasury has introduced the CSD (Central Supplier Database). In line with National Treasury directives ERWAT is no longer accepting vendor applications as from 1 July 2016. All vendors must now register on the National Treasury Central Supplier Database. For more information please visit our "Procurement" page.

 

Welgedacht WWTW extended with 50 megalitres per day

AN EXCITING DAY AT WELGEDACHT WASTEWATER TREATMENT WORKS

Excitement filled the air on Monday, 9 May 2016 when the Executive Manager: Operations, Mr Fortune Mabunda, switched on the pumps to start pumping the first wastewater through the new 50 megalitre per day (Mℓ/day) extension at ERWAT’s Welgedacht Wastewater Treatment Works (WWTW).

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War On Leaks Program by DWS

A “War on Leaks” program was recently launched by the Department of Water and Sanitation (DWS), in collaboration with Rand Water.

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Four ERWAT plants received recognition at WISA 2014

Four of ERWAT’s larger wastewater treatment works (WWTW) were recognised for their achievements at a recent conference hosted by the Water Institute of Southern Africa (WISA). These WWTW’s are Waterval, Olifantsfontein, Dekema and Rondebult.

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CONTACT ERWAT

Telephone: +27 11 929 7000

Facsimile: +27 11 929 7031

ENQUIRY: ERWAT

General email: mail@erwat.co.za

Laboratory email: laboratory@erwat.co.za

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