Case 2 Assignment Solution

# Case 2 Assignment Solution - APSC 150 Biological...

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APSC 150 Biological Engineering Tutorial Solutions APSC 150: Engineering Case Studies Assignment #1-Conceptual Process Design a) Example solution (some examples of solutions that you may have proposed and rating criteria that you may have used). Methanol Removal Method Evaluation Criteria Filtration Boiling Absorption Bacteria Eat it i) Easy 5 3 ii) Needs \$\$\$ Equipment 2 1 iii) Enviro Friendly 3 1 iv) Able to Do job 1 5 v) Skilled People 4 1 vi) vii) Total score 14 11 Markers: Please note that assignment 1 was just meant to get the students to brainstorm alternative methods for solving the given problem. The marking of their solutions, and associated decision matrices, is going to be subjective. Assignment #2 Solution #1. a) C 5 H 7 O 2 N + 5O 2 5CO 2 + 2H 2 O + NH 3 1 mole of bugs need 5 moles of O 2 113 g of bugs need 5 × 32 = 160 g of O 2 1 g of bugs need 1.42 g of O 2 1 mg/L of bugs requires 1.42 mg/L of O 2 (COD) b) HOOCC 6 H 4 COOK + 15/2 O 2 7CO 2 +2H 2 O + KHCO 3 12 8 x C = 96 16 4 x O = 64 5 x H = 5 K = 39 204

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APSC 150 Biological Engineering Tutorial Solutions 204 g KHP need 240 g O 2 x g KHP need 500 g O 2 x = 425 425 mg/L KHP has COD of 500 mg/L #2. CH 3 OH + aO 2 + bNH 4 + + cHCO 3 - dC 5 H 7 O 2 N + eCO 2 + fH 2 O C 12 C 5 60 4H 4 H 7 7 O 16 O 2 32 32 N 14 113 If yield is 0.42 (class example): i) Calculate d d = = × × = ethanol mole biomass mole 0.12 biomass g 113 biomass mole 1 methanol mole methanol g 2 3 methanol g biomass g 0.42 Y X/S ii) Calculate b b = 0.12 iii) Charge balance c = 0.12 iv) Calculate f LHS RHS H 4.6 (7X0.12) + 2f f = 1.88 v) Calculate e C 1 + 0.12 (0.12x5) + e e = 0.52 vi) Calculate a O 1+2a+0.36 (0.12x2)+(0.52x2)+1.88 a = 0.9