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!

*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.


Iron Sequestration in Groundwater Treatment System

Iron Sequestration in Groundwater Treatment System

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?



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!


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