APSC 150 Case 2 Biological Engieering Quiz March 2009

APSC 150 Case 2 Biological Engieering Quiz March 2009 -...

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APSC 150 Biological Engineering 3 March 2009 Please answer all five questions. Questions 1 is worth 20 marks (1 mark each part). The marks for questions 2 through 5 are shown. 1. Please answer true (T) or False (F) to each of the following: a) Levoisier did experiments to show that matter (mass) is conserved. b) Biological treatment in a lagoon removes the colour from pulp mill wastewaters. c) A secondary clarifier (in an activated sludge reactor) allows the HRT and the SRT to be different. d) In the BOD test, a control is used to account for the amount of oxygen used by the bacteria when they are not exposed to effluent. e) Bacteria can break down hydrogen peroxide and produce oxygen. f) If the level of dissolved oxygen goes below 1 mg/L in a BOD test, we would not count the results because oxygen would be limiting. g) It would be impossible to get more than 10,000 kg of bacteria produced from 10,000 kg of BOD. h) In activated sludge reactors, biomass must be wasted at the same rate it is produced to keep the reactor at a steady state. i) In biological systems, if microbial growth decreases, then less of the substrate is completely oxidized, and less oxygen is required. j) The rate of oxygen transfer from the atmosphere to a body of water would be increased by increasing the surface area of contact. k) Lagoons would often have more aerators at the front (inlet) end, than at the back (outlet) end. l) Pharmaceuticals (drugs) would be found in most municipal wastewaters. m) Activated sludge reactors are less susceptible than lagoons to toxic shocks because of their recycle stream. n) Dupont has developed a process by which plastics can be made from renewable feedstocks. o) Design problems are typically over-specified. p) If the flowrate of wastewater to a lagoon increases, then the effluent BOD will increase too. q) Biological systems, because of microbial growth, do not necessarily obey the law of
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This note was uploaded on 04/10/2010 for the course APSC 150 taught by Professor Hatzidizakes during the Spring '09 term at The University of British Columbia.

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APSC 150 Case 2 Biological Engieering Quiz March 2009 -...

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