Facultative Lagoon Design

[rmstod]

I am in the process of formulating the process design for a 5 MGD facultaive lagoon WWTP with pond depths of 7'. BOD and SS loadings are quite high: 26,000 #/day and 29,800 #/day respectively primarily due to milk processing wastes. Client does not want to supplement natural aeration/photosynthesis process with mechanical aeration in the winter (quite windy location). The average winter air temperture is 47.3 F. The calculated BOD loading to determine surface area needed, depending on the reference, varies between 17.4 #/ac-day to 168 #/ac-day. The references are somewhat dated. With my reserch to date, 40#/acre-day BOD loading rate seems reasonable. Current loading 56#/acre-day but at times D.O. maintenance is problematic. Any feedback on best references and/or recommended loadings?

 

[mstrobscure]

I would suggest a copy of "Wastewater Engineering: Collection, Treatment, Disposal, 4th edition, by Metcalf & Eddy. Here is a link to the book's website:

http://www.mhhe.com/engcs/civil/metcalf/index.mhtml

 

[RWF7437]

Where are you ? Who is the regulatory agency who will review and approve your plans ? Check with them first to see if they have criteria you must use !

Good luck

 

[emma2000]

I suggest that you have to see this Website

http://www.leeds.ac.uk/civil/ceri/water/tphe/publicat/pdm/med/medman.html

They will give a good information about this topic.

 

[rmstod]

Thanks Guys. I had used M&E as one reference. The tip from emma2000 looks good and hopefully will provide the needed confirmation.