| eMalahleni Waste Water Treatment |
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Emalahleni Municipality is situated in Mpumalanga Province, and it represents one of six local municipalities in the Nkangala District Municipality. It forms part of the western regions of Mpumalanga Province and borders onto Gauteng Province.
The southern parts of the Emalahleni Municipality form part of the precinct referred to as the Energy Mecca of South Africa, due to its rich deposits of coal reserves and power stations such as Kendal, Matla, Duvha and Ga-Nala.
Besides Witbank town, other activity nodes/towns in the municipal area are represented by Ogies and Phola; Ga-Nala and Thubelihle; Rietspruit; Van Dyksdrift and Wilge. This area is represented by a number of Waste Water treatment facilities that include the following with their respective design capacities:
Riverview 12 Ml per day
Naauwpoort 5 Ml per day
Ferrobank 16 Ml per day
Klipspruit 10 Ml per day
Rietsspruit 1 Ml per day
Kriel/Ga-Nala 5 Ml per day
Phola 3 – 4 Ml per day
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| ERWAT JP Marais HTH® Scientific™ Dosing System - alternative chlorination system |
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About JP Marais WWTW
JP Marais Works is situated in Benoni area and falls within the DD5 ERWAT area. It is designed to treat 15 Mℓ per day of raw sewage water. Conventional activated sludge is employed as the main sewage purification process. The final effluent is chlorinated before discharging it into a tributary of the Blesbokspruit.
Problem
Chlorination of the semi-treated water with chlorine gas (915-kg Chlorine gas tanks) could be interrupted by either planned - or unplanned events.
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| ERWAT Rynfield HTH® Scientific™ Dosing System - alternative chlorination system |
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About ERWAT
ERWAT or East Rand Water Care Company, South Africa’s largest wastewater treatment company provides bulk wastewater conveyance and a highly technical and proficient wastewater treatment service to some 2 000 industries and more than 3.5 million people who have access to sanitation services.
It comprises currently of 19 wastewater care works, treating a combined capacity of 696 Mℓ of wastewater per day. These operations are mainly situated in the Ekurhuleni Metropolitan Council.
The wastewater treatment works in each catchment are grouped together in three drainage districts: District DD3, DD5 and DD6.
The Rynfield Works is situated south-west of the Van Ryn Dam in Benoni and falls within the DD5 area. Built in 1969 and extended in 1979, it is designed to treat 13 Mℓ per day of raw sewage from the Benoni, Cloverdene and Rynfield areas. Both biological filtration and activated sludge are employed as treatment processes.
A central inlet works, incorporating the processes of screening and grit removal serves the works. The older biological filtration module includes primary sedimentation, biological filtration and humus clarification. The BNR activated sludge module consists of a 5 stage reactor basin and final clarification. The final effluent is chlorinated before discharging it into a tributary of the Blesbokspruit.
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Background
Riespruit WWTW was built in 1952 and subsequently upgraded in the 1970’s. The plant currently has a design capacity of 36Ml/day and has an operational capacity of 30Ml/day. The plant serves an approximate population of 125, 000 and is impacted by the cities/villages; Vanderbijlpark, Boipatong, Bonnane, Bophelong and Muvhango.
ProblemA problem was identified at Rietspruit WWTW and an enquiry was directed to the ICM team at Arch Chemicals. The discharge water from the treatment plant was problematic in that the bacterial levels and free chlorine readings were out of specification. An investigation was conducted and it was found that the plant design is as such that during low flow/peaks, the water supply to the chlorine gas dosing installation is insufficient and hence no chlorine dosing is administered, subsequently resulting in highly contaminated discharge.
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