APSC 150 Case 2 Biological Engieering Quiz March 2009 Solution

APSC 150 Case 2 Biological Engieering Quiz March 2009 Solution

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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. (True) b) Biological treatment in a lagoon removes the colour from pulp mill wastewaters. (F) c) A secondary clarifier (in an activated sludge reactor) allows the HRT and the SRT to be different. (True) 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. (True) e) Bacteria can break down hydrogen peroxide and produce oxygen. (True) 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. (True) g) It would be impossible to get more than 10,000 kg of bacteria produced from 10,000 kg of BOD. (True) h) In activated sludge reactors, biomass must be wasted at the same rate it is produced to keep the reactor at a steady state. (True) i) In biological systems, if microbial growth decreases, then less of the substrate is completely oxidized, and less oxygen is required. (F) j) The rate of oxygen transfer from the atmosphere to a body of water would be increased by increasing the surface area of contact. (True) k) Lagoons would often have more aerators at the front (inlet) end, than at the back (outlet) end. (True) l) Pharmaceuticals (drugs) would be found in most municipal wastewaters. (True) m) Activated sludge reactors are less susceptible than lagoons to toxic shocks because of their recycle stream. (F) n) Dupont has developed a process by which plastics can be made from renewable feedstocks.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

APSC 150 Case 2 Biological Engieering Quiz March 2009 Solution

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online