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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.
Problem
A 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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Problem
This plant is situated in the residential area in the town Bela Bela. The old plant used Chlorine gas for post chlorination, but this type of disinfection is a high risk. Due to non compliance on the existing chlorine gas installation and high capital costs requirements for upgrading this facility, an alternative, safe, cost effective chlorination method was opted.
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Siza water - Sewage Water Treatment |
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Siza water at Frasers Works Ballito treats about 5 Ml of sewage water per day.
Problem
There are two main concerns at this plant:
- The operation of the Chlorine gas chlorination system is unsafe if it is not properly operated and maintained by skilled staff.
- The control system to ensure sufficient residual Chlorine levels in the final water, was not difficult to operate and not accurate to comply to the discharge requirements set by Department of Water Affairs (DWA).
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DBF at Johannesburg Water |
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Problem:
The Johannesburg Water Company treats most of the residential waste water in the Northern Suburbs of Johannesburg, and current treats some 800 Million liters of domestic effluent per day. Using gaseous Chlorine the obvious safety risks were identified and a decision was made to look for an alternative source of disinfection material. All of the treatment plant final effluent flows into rivers and streams which presented another challenge in terms of which type of chemistry could be used.
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