Please explain. Draw (by hand) a diagram for each of the below four situations.
ID: 982975 • Letter: P
Question
Please explain. Draw (by hand) a diagram for each of the below four situations. For each situation, represent how the dissolved oxygen concentration changes as you measure it over time in a BOD bottle. The axes on each diagram should be dissolved oxygen (starting at say 9.0 mg/L) [not BOD] versus time (for say 10 days). HINT: stream water contains algae, microbes and easily biodegradable organic matter. Remember that these are closed bottles so no oxygen will reenter the water from the atmosphere. a. stream water, 20°C, bottle stored in the dark b. stream water, 30°C, bottle stored in the dark c. unseeded sugar water, 20°C, bottle stored in the dark d. stream water, 20°C, bottle stored in the light Note: The point of this problem is to be able to compare the relative trends between the four situations. You will have microbes and algae in stream water.
Explanation / Answer
The main point is you to recognize wich of the different samples of water will decrese it BOD in terms of time.
Note that BOD decreases as temperature increases.
Note that BOD decreases as there are aerobial microorganism.
Note that BOD remains constant as there are anaerobial microorganism.