Environmental Engineering

1- Develop an EN-ROADS scenario simulation gets to at least +1.5°C and describe the impact your scenario could have on travel & tourism as a sector. Screenshot and submit your EN-ROADS scenario. 2- Briefly explain the decisions you made for Energy Supply, Transport, Land, and Industry Submissions. Predict the impact your scenario might have on travel & tourism as a sector. Use up to 1,000-words for all questions and add the word count. Cite any references used; citations are not counted in the word limit. 3- Write Executive Summary Use this link to do the EN-ROADS scenario simulation:

Problem 5. Repeat problem 4 for the scenario in which the river has an initial oxygen deficit of 2.0 mg/L (instead of 0) at the mixpoint.

What was the outcome of the hazardous waste episode at Times Beach?(Hint: You will need to do an Internet search.)

Problem 3. A BOD test is run using 100 mL of wastewater and mixed with 200 mL of pure water. The initial DO of the mix is 9.0 mg/L. After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L and the D0 is no longer changing. Assume nitrification is insignificant (all BOD is carbonaceous). A. What is the BOD5? B. Assuming no nitrification effects, estimate the ultimate carbonaceous BOD. C. What would the BOD remaining be after 5 days? D. Estimate the reaction rate constant k (day')?

Problem 5. A sewer pipe 2 m in diameter is half full of water flowing at an average speed of 1.5m/sec with a BOD of 150 mg/L. The pipe flows into a basin (10,000 m³ volume), which is also fed by a stormwater pipe 1 m in diameter, half-full with water, flowing at 1.0 m/sec and no BOD.The basin has a constant volume, and a single outlet. What is the steady state concentration of BOD in this outlet stream? BOD degrades as a first order kinetics in the basin of 0.9 day'.

2. A rapid sand filter has a sand bed depth of 762mm. Sand specific gravity = 2.65 Porosity (ɛ) = 0.41 Filtration rate = 1.53 Ips/m^2 Shape factor (4) = 0.80 Temperature = 15°C%3D H = 1.139 x 10³kg/m-s p = 999.1kg/m3 Determine the head loss for a clean filter using the Carman-Kozeny equation for a stratified bed.

For a soil sample received in your lab, the fraction of organic carbon has been reported to be 0.15. You have done two isotherm experiments and you have obtained the following results: Test 1: Aqueous-phase concentration 0.30 [µg/kg] and solid-phase concentration: 0.360 [µg/kg] Test 2: Aqueous-phase concentration:0.20 [ug/kg] and solid-phase concentration: 0.240 [μg/kg]

Problem 4. Using the following estimates for the US and assuming that growth rates remain constant. A. Find the carbon emission rate in 2020. B. Find the total carbon emitted during those 30 years. C. Find the total energy demand in 2020. D. Find the per capita carbon emissions in 2020.

10. Please identify the lake stratification layers then please describe what happens during spring and fall turnover.

Question 3 Not yet answered Marked out of 0.10 Flag question Design a cylinder rapid mixer for a water treatment plant with a peak flow rate of 45,000 m³/d. The velocity gradient G in the mixer is to be at least 2,000 s¹ and the detention time is at least 12 s. Determine the size of the mixing tank, the power input, and the rotational speed of the mixer. Assume: H (mix basin height) =D (tank diameter) D, (impeller diameter): D=0.65 Np=7.1 D=H=1.53 m; Power = 315 W; D-0.574 m; n = 3.84 rps OD=H=1,43 m; Power = 2315 W; D=0.574 m; n = 1.84 rps OD=H=2 m; Power = 25000 W; D=1.30 m; n = 0.985 rps D=H=1.43 m; Power = 2325 W; D=0.274 m; n = 0.84 rps O D=H=0.43 m; Power = 2315 W; D=1.574 m; n = 1.24 rps Next page ?