1 / 11

OD-BOD Model for rivers

OD-BOD Model for rivers. Processes involving Oxygen. Production Consumption by organisms (BOD) Consumption by Chemical reactions, Fluxes across the free surface. The OD-BOD evolution equations. O2 Free surface exchange.

rogan-sharp
Download Presentation

OD-BOD Model for rivers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OD-BOD Model for rivers

  2. Processes involving Oxygen • Production • Consumption by organisms (BOD) • Consumption by Chemical reactions, • Fluxes across the free surface

  3. The OD-BOD evolution equations

  4. O2 Free surface exchange Where is the Henry’s constant (mole/L/atm – Moles per litter per atmosphere) and Pg is the partial pressure of the gas in the atmosphere. Depends on the temperature and on the type of gas. The table below presents values for common temperatures. (from http://thayer.dartmouth.edu/~d30345d/books/EFM/chap15.pdf)

  5. Using the values in this table, the saturation concentration of oxygen in water at 20 degrees is: A O2 molecule has two atoms and their molecular weight is 16g, the saturation concentration in mg/L is: The saturation concentration decreases with temperature. This is an extra reason for eutrophication consequences to be higher in warm water. The other is the more intense biological activity (respiration).

  6. Another empirical equation to compute the saturation concentration ishttps://books.google.pt/books?id=pMyy8ERbZmEC&pg=PA390&lpg=PA390&dq=o2+rivers+aeration+rate&source=bl&ots=N1blM_duQZ&sig=5KarMV3SsahSlcNKwHC-qFWgP9g&hl=pt-PT&sa=X&ved=0ahUKEwjU88GX1t_MAhXEWxQKHQjjBMwQ6AEIITAA#v=onepage&q=o2%20rivers%20aeration%20rate&f=false Examples of correlation to compute K0 :

  7. BOD Equation

  8. Bibliography • Notes provided in the course bibliography;

More Related