After the Storm 6 min 1 Question 1 What is a watershed A B C D It is where people go to the bathroom Something to do with sweating A shed that holds water An area of land that drains into a body of water E The ocean 30 sec 2 Question 2 What have been the water quality problems at the Santa Monica Bay A Nutrient runoff B Pathogens from feces i e fecal coliform contaminate the surf zone C Contaminants delivered through pipelines D All of the above 30 sec E None of the above 3 Question 3 What can be said about the hypoxic zone in Gulf of Mexico A An area of water lacking dissolved oxygen B The size of the hypoxic zone in the Gulf of Mexico is about the size of state of New Jersey C The shortage of oxygen is killing fish and other sea life D Hypoxia causes economical disaster 30 sec E All of the above 4 Quiz 6 question 4 What of the following statement is NOT correct 1 min A Organic waste oxygen CO2 H2O new cells stable products SO4 PO4 NO3 B The amount of oxygen required for bacteria to oxidize organic wastes aerobically i e in the presence of oxygen is called biochemical oxygen demand BOD It is expressed in term of mg L C BOD is a constant D Lo BODt Lt BODt Loe kt Question 5 What processes control concentration of DO in a river A DO is consumed by waste deoxygenation B Oxygen is added from atmosphere reaeration C Neither of the above D Both A and B 30 sec 6 Quiz 6 question 6 Select a incorrect statement 30 sec A DO initially decreases because the rate of deoxygenation exceeds the rate of reaeration B At critical points the rate of deoxygenation equal the rate of reaeration C After critical points the rate of deoxygenation still equal the rate of reaeration Quiz 6 question 7 A wastewater treatment plant discharges an effluent containing 2 mg L of dissolved oxygen to a river that has a dissolvedoxygen concentration of 9 mg L upstream of the discharge Calculate the dissolved oxygen deficit at the mixing basin Assume that the river and plant discharge have the same flow rate and DO at saturation is 9 mg L 3 minutes A 3 5 mg L B 40 mg L C 0 4 mg L D None of the above 1 2 3 4 5 6 7 D B E C D C A Qriver Qdisch arg e Q Qriver DOriver Qdisch arg e DOdisch arg e Qtotal DOtotal Q DOriver Q DOdisch arg e 2Q DOtotal DOriver DOdisch arg e 2 DOtotal mg mg 9 2 L L 5 5 mg DOtotal 2 L D DOsat DOtotal 9 mg mg mg 5 5 3 5 L L L
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