INDUSTRIAL AND HAZARDOUS UNIT 4 & 5

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All answers should at least 200 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.

 

Question 1

You are a consultant who has been hired by a city to help reduce organic matter in their system while improving the dissolved oxygen concentration and deriving an optimal sludge to ultimately bag and sell as an agricultural soil conditioner. Explain the chemistry necessary to properly digest the waste during the aerobic digestion process in order to maximize effluent oxygen concentrations in the water while deriving higher concentrations of nitrate, nitrite, sulfate, and phosphorus in the final sludge product

Question 2

You are a consultant who has been hired by a city to help reduce organic matter in their system while improving the dissolved oxygen concentration and deriving an optimal sludge to ultimately bag and sell as an agricultural soil conditioner. What equation(s) would you use to calculate the number of days the sludge must remain in the anaerobic digester in order to maximize volatile organic digestion and still produce a favorable sludge high in nitrogen and phosphorus? Be sure and explain the chemistry behind your equation selections.

Question 3

Describe the Cyclic Activated-Sludge System, discuss its mode of operation and the potential benefits as an equipment option for an activated sludge unit to be designed into a batch wastewater pretreatment system.

Question 4

· Describe the design considerations inherent in a completely engineered biological oxidation unit. Be sure and describe every aspect of the unit relevant to the design considerations.

 

Question 6

You are a consultant who has been hired by a city to help treat hydrocarbon-laden wastewater in its pre-treatment system. Discuss the calculations you would make in order to determine the risks associated with the ambient air environment, relative to the pumps, mixers, and other electrical equipment that the city has already elected to use in the pre-treatment process.

Question 7

You are a consultant who has been hired by a city to help treat hydrocarbon-laden wastewater in its pre-treatment system. Specifically, the client knows that there is a significant concentration of ethane in the influent waste stream. Discuss the importance of understanding the solubility of ethane in the wastewater, relative to the process efficiency and relative safety of the entire pre-treatment system, and describe the steps that you would take to fully understand the ambient air quality of the system.

Question 8

· Discuss the necessary design features of a biological filtration system. Be sure and include information regarding distribution, volume, and media considerations and options.

Question 9

· Discuss the necessary design features of a secondary settlement tank. Be sure and include information regarding capacity design considerations in your discussion.

 
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