Solutions PS 4 F08

Solutions PS 4 F08 - CEE 153 SOLUTION SET: HOMEWORK #4...

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Page 1 of 5 CEE 153 SOLUTION SET: HOMEWORK #4 Problem #1: a) Mass balance with reactors: 4 (well mixed) 10 100 1 1 aa mm r m ma a r ar a CQ kCV C C QQ C mL C kV Qk V Q =+ = = == = + + () ( ) 73 3 4 0.5 10 86,400 sec sec 10 100 170 200 Standard is met 100 100 57.9 day m day m mL mL mL ⎛⎞ ⎜⎟ ⎝⎠ + < + b) ( ) 6 64 3 62 1% suspended 0.01 11 Fraction settling sec 0.1 86,400 sec 1 0.54 0.86 Mass set dredge s kg m day kg kg day day Q m wA day m m day = = + + + ± 4 tling 0.54 5,400 kg kg day day = Problem #2: a) 6 3 7 6 3 Fraction of not settling outflow mass flux 0.5 10 1000 50 ps sp s s o u t out ss mF Fm kg yr m Q yr C kg L mg L mg m =− −= = = ± ± ±
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Page 2 of 5 () 3 76 2 3 7 10 1.5 0.5 0.9 10 in out in out in QP A Q E A mm m QQ P E A m yr yr yr m Q yr += + =− = b) 6 6 62 3 A settling mass flux 0.5 10 = 10 1,000 50 sp s ss s ss Fm C w kg yr m w yr CA kg L mg m L mg m == ⎛⎞ ⎜⎟ ⎝⎠ ± ± c) Molecular weight of plankton 106 12 263 1 110 16 16 14 31 3,550 Molecular weight of nitrogen in phytoplankton 16 14 224 + × + × + × = =×= 64 224 becomes 3,550 plankton 224 224 Input of is 6.3 3,550 3,550 F kg N kg kg
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This note was uploaded on 05/19/2011 for the course CEE 153 taught by Professor Stolzenbach during the Fall '08 term at UCLA.

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Solutions PS 4 F08 - CEE 153 SOLUTION SET: HOMEWORK #4...

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