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.


Why the COD is within norms and BOD out of norms ?

Why the COD is within norms and BOD out of norms ?

The norm for COD is 250 mg/l and the actual value is 45 mg/l.The norm for BOD is 30 mg/l ,actual is 40 mg/l per day and 90 mg/l for 5 days. What is the reason for this relative to a waste water treatment plant ?

RE: Why the COD is within norms and BOD out of norms ?

Incorrect testing. There is no way that the BOD can be greater than the COD, ever. It is very possible for the BOD to be lower than the COD- in fact the BOD can be zero and the COD very high if all the species in the water are toxic to organisms!

RE: Why the COD is within norms and BOD out of norms ?

Probably an error of some sort. The BOD procedure is more difficult than the procedure to determine the COD.

Some compounds are not biodegradable, but will chemically oxidized. These compounds will show a high COD and zero BOD.

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