×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Primary treatment component arrangement
2

Primary treatment component arrangement

Primary treatment component arrangement

(OP)
Hi wastewater folks,

Can you help an old EE who's a little stymied about the arrangement of components at the front end of a municipal-size treatment plant?  I want to draw a "typical" diagram, but it seems that the plants I have seen in person are all different:

Coarse bar screen, pumps, fine screen, comminuter, grit tank

Coarse bar screen, fine screen, pumps, grit tank

Coarse bar screen, comminuter, pumps, fine screens, grit tank

I know there may not be a "typical" arrangement, but I would appreciate any ideas of what you folks might put in such a diagram.

I'm actually doing a presentation on the process controls. I'm pretty good at those, but I want to include an overview of the process.  I'll be staying away from the biology part, though.

Oh, and the plant in question is activated sludge, aerobic digestion, 150 mgd.

Good on y'all,

Goober Dave  

RE: Primary treatment component arrangement

There us a diagram on wikipedia.

http://en.wikipedia.org/wiki/Sewage_treatment

The arrangement on the Lenntech site is probably typical.

http://www.lenntech.com/wwtp/wwtp-overview.htm

The location of the lift pumps depends on the terrain which is very site specific. If the terrain slopes to the treatment plant, you may not have lift pumps.

Screens, comminuters, and grit tanks are optional. You probably will not have a comminutor on a 150 mgd plant.  

RE: Primary treatment component arrangement

(OP)
Thank you so much, bimr!

That's a huge help.

Double good on ya,

Goober Dave

RE: Primary treatment component arrangement

From what I've heard (and I'm not an expert), you want the grit chamber before the fine screen to minimize the wear on the mechanical apparatus of the fine screen.

This appears to be in general agreement with the post above.

Pumping is site specific.  You need to select pumps capable of passing solids that will be in the flow.

RE: Primary treatment component arrangement

(OP)
Thank you FiltrationEngineer,

I'll bring that up.  My presentation is next Wednesday, so good timing!

As for pumps passing solids, I got to see a couple of live turtles make it up to the top of the riser in Memphis (about 60 feet).  That was cool.

 

Good on ya,

Goober Dave

Haven't see the forum policies?  Do so now: Forum Policies
 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources