cee111-fa03-final-nazaroff-soln

cee111-fa03-final-nazaroff-soln - cell mass) by biofilm...

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CE 111: Environmental  Engineering ANSWERS TO SAMPLE FINAL EXAM  1. WARM-UP EXERCISES (a) J = flux [=] M L -2 T -1 ; D = diffusivity [=] L 2 T -1 ; C = concentration [=] M L -3 ; x = distance [=] L (b) U = velocity [=] L T -1 ; K = hydraulic conductivity [=] L T -1 ; h = head [=] L; l = length through sand column [=] L (c) τ ∼ ς Θ + Αω τ (d) Λ ∼ 2 Υ (e) Θ Α σ = π∆ 2 (f) 2 Fe 2+ + HOCl 2 Fe 3+ + Cl - + OH = (g) C 2 H 6 O + 3(O 2 + 3.78 N 2 ) 2 CO 2 + 3 H 2 O + 11.3 N 2 2. TRY THESE! (a) pH ≥ 8.3 (b) P = 1.03 atm (c) C max = 1.7 g/m 3 (d) τ δ = λν(229 Κ σ + Σ [ ] Ψκ μ Σ 3. ON WATER QUALITY ENGINEERING (a) When there is insufficient alkalinity in the water to form CaCO 3 (s) (b) CO 2 (g) (c) Na + (d) Disinfection and sedimentation (e) By scraping the schmutzdeck off the top and discarding (f) HOCl (g) Less prone to form disinfection byproducts (h) N, P (i) Nonaqueous phase liquid (e.g., gasoline) (j) C+P make small particles stick together so that they settle more rapidly (k) Reverse osmosis (only) (l) BOD is oxidized (or incorporated into
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Unformatted text preview: cell mass) by biofilm growing on media 4. ON AIR QUALITY ENGINEERING (a) Reduce emissions of precursors: NO x and VOC (b) SO 2 , PM (c) Thermal NO x : N from N 2 , formed at high T; fuel NO x : N from fuel, formation insensitive to T (d) Ash is nnoncombustible, from impurities in fuel. Diesel PM is carbonaceous, formed by incomplete combustion. It is known as soot. (e) Reaction triggered by absorption of a photon, e.g. NO 2 + h NO + O (f) (i) Avoid use; (ii) replace fireplace with airtight, low emitting wood-burning stove (g) (i) Fuel reformulation (oxygenate addition); (ii) catalytic converters on exhaust (h) (i) Fuel reformulation (reduce S content); (ii) diesel particle traps on exhaust 5. DRINKING WATER DISINFECTION (a) k = 11.5 min-1 (b) 99.999% (5-9s removal) (c) 99.8% 6. ETS CONTROL BY AIR FILTRATION (a) C* = 29.1 g m-3 ; = 117 min (b) C* = 28.6 g m-3 ; = 73 min...
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This note was uploaded on 12/01/2011 for the course CE 13972 taught by Professor Chow during the Spring '09 term at University of California, Berkeley.

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