An air particulate control (APC) device has the theoretical efficiency/particle size relationship given in the Table below. Use the particulate size distribution data from Q1 above to calculate the overall removal efficiency of this APC. Size range (um) Efficiency (%) 0-2 10 2-4 25 4-7 45 7-10 70 10-15 85 15-25 95 25-40 97 40-60 98 >60 100

Sanitary Engineering laboratory  Turbidity of water test   QUESTIONS:1. Where do you find the adverse effects of turbidity in environmental engineering? Mention twoinstances.2. Discuss the significance of determination of turbidity in sanitary engineering.3. Discuss the nature of materials causing turbidity in(a) River water during flash flood(b) Polluted river water(c) Domestic wastewater4. What is the standard unit of turbidity?5. What are NTU and JTU?

True or False: When comparing two samples of equal mass, the number of particles in each sample is inversely proportional to the size of the particles cubed. Select one: O True O False True or False: PM 10 measurements only account for particulate matter exactly 10 microns in diameter large. Select one: O True O False

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You have been treating a wastewater with bacteria that have the following kinetic coefficients: k= 16 mg BODL/mg VSS-day Ks = 10 mg BODL/1 b =0.2/day Y = 0.35 mg VSS/mg BODL fa=0.8 A genetic engineer comes to you and claims he can "fix" your bacteria so they are more efficient. The fixed bacteria will have b=0.05/day and fa= 0.95, while all other coefficients are the same. Using a chemostat reactor, you were successfully using a safety factor of 30, and you plant to continue doing so. How would the genetic engineers plan affect your sludge production and oxygen requirements? Assume Xº=0, Sº=200 mg BODL/1). In what ways are the new bacteria more efficient?

Which of the following is not an apparatus or supplies for the Plastic Limit O flat glass plates for mixing soil and for rolling threads ) Distilled water O A length of rod 3 mm in diameter and 100 mm long ) Casagrande apparatus Based on the below data from a sieve analysis test, what is the cumulative percent retained above 1.25 mm sieve: Sieve Mass Size Retained 5.00 mm 10 2.50 mm 40 1.25 mm 30 630 pm| 120 315 um 12 8 160 μm Pan O 64% 36% O 22.5% O77.5% The hydrometer method is based on Stokes equation for the velocity of a freely 8 (Ctrl) - falling sphere. True False

Assuming that the specific gravity of the following substances is approximately the same, that is, 2.65, and that the water is at 20°C, calculate the time it will take to settle 1m of the following materials: a) Gravel (Dp=10,000 μm) in seconds I want help with this one, I did the problem but the time gave me 36.36 seconds and the Dr told me that the result is incorrect, I would like to know how to do it. I used the formula of V=Dp^2(g)(△p) / 18μ ; Then use a substitution to calculate the time which would be t=h/v

A continuous stirred tank reactor (CSTR) Activated Sludge Process is used to treat municipal wastewater after primary sedimentation. The following data is available: Primary Effluent Flow Rate (Q) Primary Effluent BOD Concentration (So) Secondary Effluent Biomass Concentration (Xe) Mixed Liquor Biomass Concentration (X) Solids Retention Time (SRT) Waste Sludge Flow Rate (Qw) Value 450 200 O 0 3,000 5 8 Biomass Concentration in RAS (XR) 8,000 O 250 million gallons, 0.28 gBOD/gVSS.d, 13.3 hours 107 million gallons, 0.28 gBOD/gVSS.d, 5.7 hours O 107 million gallons, 0.42 gBOD/gVSS.d, 5.7 hours 107 million gallons, 0.28 gBOD/gVSS.d, 12.2 hour Unit mgd mg/l mg/1 mg/l days mgd The bioreactor volume (V), F/M ratio, and HRT are respectively: mg/l

In breakpoint chlorination test, it is found that the free/residual chlorine concentrations are as same as the corresponding chlorine dose added to the samples. How will the test data look like in a graphical form? Select all those are correct. The line will show the pick hump. The line slopes 45 degree. The line is parallel to the zero-demand line. The breakpoint will be clearly visible in the graph.

What is the effective fiber diameter of a membrane filter with a pore size of0.45 * 10^-6? The solidity is 0.20, the thickness is 0.15 mm, and the pressure dropis 1 cm Hg at U0 = 0.015 m/s