×
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

Converting TF humus tanks for BNR

Converting TF humus tanks for BNR

Converting TF humus tanks for BNR

(OP)
G'day All.

I recently recommended one of my clients (running a municipal WWTP) should replace his old 1940s rock media trickling filters with an MLE bioreactor for a number of indisputable reasons.  I expect to be engaged to prepare detailed designs for this upgrade in the new year some time.

The client would like to retain much of his existing plant (apart from the trickling filters) and I agree that this is a sensible strategy in this case.

I've checked the capacity of the primary clarifiers, digesters and other parts of the plant, which all seem OK,  but I am a little concerned about the existing humus tanks.

The plant has 2 off 50' diameter humus tanks that I would like to reuse as secondary clarifiers for the MLE process.

All the literature values suggest the size of the tanks should be more than adequate based on overflow rate and solids loading but I am a bit concerned with the side wall depth (only 8').

I would normally design secondary clarifiers for BNR plants with at least 12' SWD, and preferably 15'.

I have this vision of sludge cascading over the effluent weirs and the scraper mechanisms shearing off due to excessive solids loading.

The capacity of the plant in question is around 10,000EP (2.5ML/day ADWF) with a peak flow to the clarifiers of 7.5ML/day.

Does anyone have any experience (good, bad or ugly) with reusing relatively shallow humus tanks for activated sludge service?

Cheers,
Aussie Mike

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