Environmental Engineering: Fundamentals and Design - Chapter 11

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TOC > Ch. 11 > 11.9 Disinfection

# Chapter 11 Wastewater Treatment

James R. Mihelcic, David W. Hand and Martin T. Auer

## Disinfection

The final step before releasing the treated wastewater to the environment is to kill microorganisms that might be health hazards. This process, called disinfection, can be accomplished by adding chlorine or by exposing the wastewater to ultraviolet light (UV). Disinfection with chlorine can produce chemicals which are dangerous to public health, so alternatives such as ultraviolet light are becoming more popular. The treated wastewater effluent can now be discharged to rivers or lakes.

UV light panels immersed in channel

Three parallel channels containing panels of UV lights

#### Credits

Three UV Light Panels photo: Andy Whaley (Michigan Tech).
Immersed UV Light Panels photo:

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