Demand

Noriel Liezel Ann B. Tepase

IV-BSCT

It is the amount of oxygen, expressed in mg/L or parts per million(ppm), that bacteria take from water when they oxidize organic matter.

What

Demand?

{Corg} + O2microorganisms CO2 + H2O

Carbonaceous & nitrogenous phase

What

Demand?

S

WATER POLLUTIONen.wikipedia.org

beforeitsnews.com

METHODS

DILUTION MANOMETRIC

It is conducted by

placing various

incremental

portions of the

sample into bottles

and filling the bottle

with dilution water.

5 days

20oC in the dark

The oxygen

consumed is

measured

directly.

Its behaviour

is more

closely parallel

that of the

waste in an

actual.

FACTORS The test measures only the

approximate amount of

oxygen.

Toxic substances

Chlorine

THANK YOU FOR LISTENING!

GOD BLESS

o Dissolved Oxygen and Biochemical Oxygen Demand Available at http://water.epa.gov/type/rsl/monitoring/vms52.cfm Retrieved 1 February 2015

o What Is Biological Oxygen Demand And How Does It Affect Water Quality? Available at http://www.freedrinkingwater.com/water_quality/quality1/1-bod-effects-on-water-quality.htm Retrieved 1 February 2015

o Chapter 9 of the Volunteer Estuary Monitoring Manual, A Methods Manual, Second Edition, EPA-842-B-06-003. The full document be downloaded from: http://www.epa.gov/owow/estuaries/monitor/

o Biological Oxygen Demand (BOD) Overview Available at http://www.polyseed.com/misc/BODforwebsite.pdf Retrieved 1 February 2015

o Gibbs et. Al., (1997) Introduction to BIOCHEMICAL OXYGEN DEMAND Technical Information SeriesBooklet No.7 Hach Company

REFERENCES