×
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

Iron Sequestration in Groundwater Treatment System

Iron Sequestration in Groundwater Treatment System

Iron Sequestration in Groundwater Treatment System

(OP)
I'm supporting a groundwater treatment system that has problematic fouling. It's about a 10 gpm system from a french drain that pumps shallow groundwater through bag filters and then two 500-lb activated carbon filters to remove BTEX (~1 ppm total). It's to prevent contamination to a small river where the treated water discharges to. The pump and treat system is mandated but in-situ remediation is forth coming of the plume.

The pumps, piping, and bag filters are subject to fouling and require frequent cleaning. Iron levels are around 8 mg/L entering the building, mostly dissolved. We measured ferrous iron at about 5 ppm. I suspect most of the oxidized iron is from the ferrous iron mixing with air in the french drain and sump. Calcium and magnesium hardness is also high (250 mg/L as CaCO3) but pH is around 7.1. Manganese is around 0.4 mg/L.

We're considering dosing a sequestering agent (polyphosphate) for iron control and peroxide for biofouling into the sump. I don't have much experience with iron sequestration and am concerned it won't be entirely effective or may increase the activated carbon frequency. Does anyone have success using a sequestering agent before activated carbon?

It's a remote site in a small building with no sewer discharge (nearest sewer is 5 miles away). Installation of aeration and sedimentation or sand filter are the other options being considered but require significant construction (site is in lower Midwest). Are there any other options I should be considering?

Thanks,

Ekolog

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close