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Question 39280

posted 1 years ago

(20 pts) Assume you are a project engineer that is evaluating the characteristics of solid waste planning in the County of Orange, CA (Orange County)
(a) Estimate the total population of Orange County (tips:indicate your sources)use internet. Remember to
(b) Estimate the total household solid waste generation in tons of Orange County per year(tips: use the information in the Topic No. 2 Handout)
(c) Estimate the total tonnage that can be recovered?
(d) Assume among the total waste, by weight: 10% plastics, 18% food, 10% paper, and5% wood. Estimate the total heat value in Btu (make necessary assumptions and quote your sources)

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Question 39281

posted 1 years ago

(20 pts) Be creative and use the knowledge you have learned in Topic 5 (partition coefficients among air, liquid, solid phases) to answer (and discuss why) the followingCOVID-19 related questions, in less than 400 words:
(a) What was the main pathway of transmission, according to CDC, when the pandemic first started? (before May 2020)
(b) What is the main pathway of transmission, according toCDC, from most recent news? (between Mar-May 2021)
(c) Compare (a) and (b), and known facts, are there changes? If there are, does it surprise you? Why?
(d) Is cleaning the environment or surfaces still significant? Discuss based on the partition/eguilibrium theories.
(A+ > 20 pts, A > 17 pts, B → 14 pts, C → 10 pts, D → 8 pts)

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Question 39717

posted 1 years ago

(20 pts) Assume you are a project engineer that is evaluating the characteristics of solidwaste planning in the County of Orange, CA (Orange County)
(a) Estimate the total population of Orange County (tips: use internet. Remember toindicate your sources)
(b) Estimate the total household solid waste generation in tons of Orange County per year(tips: use the information in the Topic No. 2 Handout)
(c) Estimate the total tonnage that can be recovered?
(d) Assume among the total waste, by weight: 10% plastics, 18% food, 10% paper, and5% wood. Estimate the total heat value in Btu (make necessary assumptions and quote your sources)

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Question 39718

posted 1 years ago

3. (20 pts) Be creative and use the knowledge you have learned in Topic 5 (partition coefficients among air, liquid, solid phases) to answer (and discuss why) the followingCOVID-19 related questions, in less than 400 words:
a) What was the main pathway of transmission, according to cdc when the pandemic first started
(b) What is the main pathway of transmission, according to CDC, from most recent news? (between Mar-May 2021)
(c) Compare (a) and (b), and known facts, are there changes? If there are, does it surprise you? Why?
(d) Is cleaning the environment or surfaces still significant? Discuss based on the partition/equilibrium theories.
(\mathrm{A}+\rightarrow 20 \mathrm{pts}, \mathrm{A} \rightarrow 17 \mathrm{pts}, \mathrm{B} \rightarrow 14 \mathrm{pts}, \mathrm{C} \rightarrow 10 \mathrm{pts}, \mathrm{D} \rightarrow 8 \mathrm{pts})

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Question 39719

posted 1 years ago

(a) Calculate your own pre-pandemic total carbon footprint in tons of CO2 from Mar2019 to Feb 2020. You should summarize your carbon footprint in the following (but not limited to) categories: Household transportation secondary
(b) Repeat (a) for “during" pandemic, from April 2020 to March 2021
(c) Convert your carbon footprint to as CH4, and N2O
(d) Discuss and predict the pandemic's impact on the global post-pandemic carbon emissions (in less than 100 words)
6) Carbon footprint (tips: reference Topic No 10 handouts and

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Question 39716

posted 1 years ago

(20 pts) What is NIMBY (Not In My Back Yard)? Introduce one example in California?Express your opinions on this specific example? Shall we and what we can do about it?
(\mathrm{A}+\rightarrow 20 \mathrm{pts}, \mathrm{A} \rightarrow 17 \mathrm{pts}, \mathrm{B} \rightarrow 14 \mathrm{pts}, \mathrm{C} \rightarrow 10 \mathrm{pts}, \mathrm{D} \rightarrow 8 \mathrm{pts})

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Question 39960

posted 1 years ago

Considering the redox reactions shown below, which are carried out by Nitrosomonas and Nitrobacter bacteria,respectively, how many moles of O2 are required to completely nitrify one mole of NH4* to NO3?
2 \mathrm{NH}_{4}^{+}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{2}^{-}+4 \mathrm{H}^{+}+2 \mathrm{H}_{2} \mathrm{O}
2 \mathrm{NO}_{2}^{-}+\mathrm{O}_{2} \rightarrow 2 \mathrm{NO}_{3}^{-}
O 2 O 4 O 1.5 03 O 1

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Question 39961

posted 1 years ago

If 160 mg of NaOH are added to 1 m of water with no alkalinity and a starting pH of 7, what would be the approximate final pH?
O 2.4
O 5.4
D 8.6
O 11.6

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Question 39957

posted 1 years ago

Circle any statement(s) that are true about the use of alum as a coagulant in a water treatment process. You may select more than one.
It will cause a decrease in the pH of a water with no alkalinity
It will consume the water's alkalinity, if available
It will cause an increase in the pH of a water with no alkalinity
If applied in combination with the correct amount of caustic soda, the pH of the water should not change much

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Question 39959

posted 1 years ago

Place the unit operations and processes in the most likely sequence for a conventional biological activated sludge wastewater treatment plant with tertiary treatment.

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