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18-Env-B9 Environmental Chemistry and Microbiology: May 2013

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Order of Reaction from a Stoichiometric Equation
  2. Question 2 Chlorine Dosing and Contact Tank Sizing
  3. Question 3 Ten Chemistry Definitions
  4. Question 4 Alternative Disinfection Technologies
  5. Question 5 UV Disinfection — Advantages and Disadvantages
  6. Question 6 Factors Influencing Disinfectant Action
  7. Question 7 Suspended Solids and Percent Volatile Matter
  8. Question 8 Five Chemical Unit Processes in Water/Wastewater Treatment
  9. Question 9 Alum Dosing for Phosphorus Removal
  10. Question 10 Process Flow Diagram — Water Reclamation to Drinking Water Standards
  11. Question 11 COD of the Standard Biomass Formula C₅H₄NO₂
  12. Question 12 Ten Microbiology Definitions
  13. Question 13 Why and How UV Technology Is Used in Water/Wastewater Treatment
  14. Question 14 Growth Phases Based on Mass of Organisms
  15. Question 15 Growth Rate of Mesophilic Bacteria vs. Temperature
  16. Question 16 Sterilization vs. Disinfection
  17. Question 17 Four Waterborne Diseases
  18. Question 18 Nutritional Requirements — Autotrophic vs. Heterotrophic Bacteria
  19. Question 19 Trihalomethanes
  20. Question 20 The F/M Ratio in Wastewater Engineering
  21. Question 21 Potential Carbonaceous BOD of 1 g of Cells
  22. Question 22 Requirements for an Indicator Organism
  23. Question 23 Filtration Without Chlorination Is Only Partially Effective
  24. Question 24 Outdoor vs. Indoor Airborne Infection Risk
  25. Question 25 Rise in Non-Infectious Disease Deaths in North America Over the Past Century

Start with Question 1 →

National Exams — May 2013 — 04-Env-B9, Environmental Chemistry/Microbiology. 3 hours duration; closed-book exam (approved Casio or Sharp calculator only). The paper has two sections — Section 1: Chemistry (11 questions, 50 marks) and Section 2: Microbiology (14 questions, 50 marks) — twenty-five questions constitute the complete exam and all are answered below. Total examination mark 100.

Reference texts. Davis & Cornwell, Introduction to Environmental Engineering (6th ed.) (water chemistry, disinfection, water/wastewater microbiology, indicator organisms); Metcalf & Eddy (Tchobanoglous, Stensel, Tsuchihashi & Burton), Wastewater Engineering: Treatment and Resource Recovery (5th ed.) (chemical unit processes, chemical phosphorus precipitation, biomass stoichiometry, activated-sludge microbiology); Guidelines for Canadian Drinking Water Quality (Health Canada); MWH's Water Treatment: Principles and Design (3rd ed.) (chlorine disinfection, contact-tank sizing).

Section 1: Chemistry (11 questions, 50 marks)