UV disinfection of Waste Water effluent

UV disinfection of Waste Water effluent

uv largeAt many waste water treatment works, the last treatment step in the process is disinfection, where the amount of bacteria present in the effluent is reduced to levels required by legislation.

In this showcase, the application of closed vessel, medium pressure UV technology is demonstrated at a waste water plant which is suitable to compare traditional chlorination with UV technology.

The aim of the showcase is to demonstrate the suitability of modern UV disinfection technology.

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Background

In South Africa traditionally chlorine is used for the disinfection of municipal waste water, which is associated with many disadvantages. The benefits of the application of UV over chlorination are worldwide increasingly recognised and can be explained as follows: UV disinfection does not result in the production of disinfection byproducts, which improves the water quality in the river system where the effluent is discharged into.

Closed vessel UV technology is not associated with any health and safety aspects for operators, compared to the big risks for operators having to work with (gas) chlorine dosing systems.

UV disinfection systems are very robust and reliable and the disinfection is not dependent on the supply and/or availability of chlorine. UV kills also chlorine resistant pathogens, such as Cryptosoridium and Giardia.

Technology

UV-halmarThe application of ultra violet (UV) light technology systems, is found in drinkwater disinfection, waste water disinfection and water re-use.

In this showcase, the application of closed vessel, medium pressure UV technology is demonstrated at a waste water plant which is suitable to compare traditional chlorination with UV technology.

Status & Feedback

The showcase is expected to start in the second half of 2014.

Location

Amanzimtoti Waste water treatment works, KZN, eThekwini Water and Sanitation.

Contact

Dhevan Govender

Senior Manager: Commercial and Business

eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8689

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Results

The aim of the showcase is to demonstrate the suitability of modern UV disinfection technology.

Supporting this goal are the following activities;

  • Training of local operators on site.
  • Testing and validation of the UV system based on the microbiological results of the influent and effluent of the UV system, with a special focus on Cryposporidium and Giardia.
  • Presentation and sharing of results with the client and relevant metro cities in South Africa.

Training

Training is anticipated to be available early 2015.

Feedback

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