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: 1 Carnation Road, Welgedacht AH, Springs

The Welgedacht works is situated in the DD5 area with a design capacity of 35 megalitres per day. The process comprises the following stages : Three sets of Archimedean screw pumps lift the raw water into the inlet works in two stages. Two coarse screens followed by two automatic fine screens and screw compactor, are used to remove rags from the influent. Grit is removed in two automatic Pista degritters.

The reactor utilises a 5 stage Phoredox process configuration, with the following zones : anaerobic anoxic,aerobic, second anoxic followed by re-aeration. Aeration is by 16 surface mounted aerators and mixing by 13 submersible mixers. Effluent from the reactor flows into three parallel biological clarifiers from which the underflow is recycled back to the anaerobic zone of the reactor. Excess sludge is wasted from the underflow. The clarifiers overflow to three chemical clarifiers where ferric chloride or polymers can be used for additional phosphate removal. Chlorine is used to disinfect the water, and excess chlorine is removed by automated sulphonation.

Sludge handling includes the use of three linear gravity screens followed by three belt presses, after which the sludge is dried on sludge drying beds.

Capacity : 35.00 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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