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Re: Disinfection



Pradeep

As you indicated there are a number of more environmentally friendly
wastewater disinfection techniques.  Each situation rrequires a technical and
cost-effectiveness analysis to determine the optimal system for the
application.

UV has generally been the most cost-effective technique.  Technical concerns
are Fe concentrations that may interfer with UV disinfection.  SS
concentrations affect the design (and naturally cost) of the system - however
secondary effluent is not a difficult stream for UV to be effective.  A
concern with UV is that there is no residual disinfectant - however it is not
necessary.  UV has been effectively used for wastewater disinfection - I
engineered a system 15 years ago that is still performing according to spec -
in many apllications.

Ozone is effective, the issue is usually high capital and O&M (uses a lot of
electricity) costs - it has been used more more drinking water disinfection.
 

UV/Ozone has advantages - again cost is a major issue.

H2O2 has not been used very much for ww disinfection because of costs.   

Hope this helps.  If you would like to discuss further, please call me at
617-964-2924

Pio Lombardo, P.E.