Equalization Basin for Sanitary Sewer 2

[RichKeller]

I'm designing a sanitary sewer for a special event complex (high flow sometimes, alomost no flow other times). It will probably require equalization and well as a lift station. Anyone have guidance/reference on equalization basin design and acceptable retention times for sanitary wastes (including aeration requirements versus detention time). Thanks.

 

[bimr]

This information is detailed very well in Section 9-4 Equalization in the book, Wastewater Engineering by Metcalf & Eddy.

 

[LHA]

Size volume to include I&I during wet weather conditions. I would use max hourly inflow for the facility you've described, but you might be able to justify max daily.

Detention time: 10-30 minutes during design inflow, depending on length of force main; can be longer with odor control provisions, but these are very costly and have huge O&M ramifications.

Aeration: Min. 1.25 scfm / 1k gallons storage AND min. of 1 mg/L at standard air conditions.

Don't forget to budget Explosion Proof (Div 1) electrical for anything (even control voltage) within storage volume. Also, check local code, you may also need Div 1 within a given proximity outside storage as well. That is a big-ticket item that is often overlooked...I blew my first design job's budget on that one!

Remember: The Chinese ideogram for “crisis” is comprised of the characters for “danger” and “opportunity.”
-Steve

 

[stanier]

you will find this type of installation at sporting arenas and holiday camps. Suggest you visit a few. The Olympics in Sydney provided such a challenge. Usually the details are provided on the web as these were very publicity orientated affairs. The proponents invariably sought recognition by peer group bodies.