Equalization Basin for Sanitary Sewer
Equalization Basin for Sanitary Sewer
(OP)
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.





RE: Equalization Basin for Sanitary Sewer
RE: Equalization Basin for Sanitary Sewer
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
RE: Equalization Basin for Sanitary Sewer