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 a a m m r m m a a a a r a r a C Q C Q k CV C C Q Q C Q C mL C k V Q k V Q = + = = = = = + + ( ) ( ) ( ) 7 3 3 4 1 0.5 10 86,400 sec 1 sec 10 100 170 200 Standard is met 100 100 1 57.9 day m day m mL mL mL + = = < + b) ( ) ( ) ( ) 6 6 4 3 6 2 10 1% suspended 0.01 10 10 1 1 Fraction settling 1 1 sec 1 1 0.1 10 86,400 sec 1 0.54 1 0.86 Mass set dredge s kg m day kg kg day day Q m w A day m m day = = × = = = + + = = + ± 4 tling 0.54 10 5,400 kg kg day day = × = Problem #2: a) ( ) ( ) ( ) ( ) ( ) 6 3 7 6 3 Fraction of not settling 1 1 outflow mass flux 1 0.5 10 1 10 10 1000 50 p s s p ss out s p out ss m F F m C Q kg F m yr m Q yr C kg L mg L mg m = = = = = = ± ± ±
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