Pump solids handling capacity behind a grinder?
Pump solids handling capacity behind a grinder?
(OP)
I'm looking at a fairly high head wastewater pumping application for a realitively small flow (~350 GPM @ 365' TDH).
I can find traditional solids handling pumps that would work connected in series. However, given the pump station is collecting flow from an entire small town I'm thinking a bar screen, or more likely a grinder, may be a necessity. That said, I'd like to hear some thoughts on using a pump behind the screen or grinder that passes a smaller solid in order to get a more efficient pump and maybe eliminate the second set of pumps.
Thanks
Mike
I can find traditional solids handling pumps that would work connected in series. However, given the pump station is collecting flow from an entire small town I'm thinking a bar screen, or more likely a grinder, may be a necessity. That said, I'd like to hear some thoughts on using a pump behind the screen or grinder that passes a smaller solid in order to get a more efficient pump and maybe eliminate the second set of pumps.
Thanks
Mike





RE: Pump solids handling capacity behind a grinder?
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Pump solids handling capacity behind a grinder?
RE: Pump solids handling capacity behind a grinder?
RE: Pump solids handling capacity behind a grinder?
At 350 GPM I'm looking at a 6" FM which would operate ~ 4 fps. I figure that shoud keep macerated solids suspended prety well. I'd maybe be thinking of a mechanical screen except for the issue of odors where the pump statin has to go.
RE: Pump solids handling capacity behind a grinder?
There are some screens that will wash the removed solids and eliminate the odors:
http://www.huber.de/fileadmin/01_Produkte/01_Reche...
But that will involve a larger lift station and operating labor.
You might also consider using a trench type self cleaning lift station and fertilizer based odor removal agents.
RE: Pump solids handling capacity behind a grinder?
Disclosure, I do work for manufacturer of this equipment.
RE: Pump solids handling capacity behind a grinder?
Your attempt to make a better mousetrap has a lot of things that could go wrong -- such as how are you going to clean the upstream screens. And no one knows if wastewater passed through a grinder pump is not going to be a problem for a "clean water" centrifugal pump. Rags and hair from barber shops seem to always cause clogging.
RE: Pump solids handling capacity behind a grinder?