18-Env-B9 Environmental Chemistry and Microbiology
Worked solutions to 3 past sittings (2013–2017), 63 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Ten Microbiology Definitions (3 sittings): May 2017 Q9 · May 2016 Q9 · May 2013 Q12
- Process Flow Diagram (2 sittings): May 2016 Q8 · May 2013 Q10
- Ten Chemistry Definitions (2 sittings): May 2017 Q1 · May 2013 Q3
Questions by sitting
May 2017
- Question 1: Ten Chemistry Definitions
- Question 2: Chemical Unit Processes in Wastewater Treatment
- Question 3: Liquid Alum Dosing for Phosphorus Removal
- Question 4: Oxygen Required for Complete Oxidation from Elemental Composition
- Question 5: Sludge Production With and Without Ferric Chloride, and Lime Requirement
- Question 6: Process Flow Diagram for Municipal Wastewater Reclamation
- Question 7: Bacterium Schematic
- Question 8: Bacterial Growth Curve
- Question 9: Ten Microbiology Definitions
- Question 10: Purpose of the BOD Test
- Question 11: SRT and Its Use in Wastewater Engineering
- Question 12: Oxygen Utilization in a Complete-Mix Reactor Without Recycle
- Question 13: Water-Transmitted Diseases
- Question 14: Role of Fungi, Bacteria, Algae and Viruses in Environmental Engineering
- Question 15: Indicator Organisms
- Question 16: SRT and Its Use in Environmental Engineering
- Question 17: Pathogen Survival
- Question 18: Food-to-Microorganism (F/M) Ratio
May 2016
- Question 1: Five Chemistry Definitions
- Question 2: Moles of Na 2 SO 4
- Question 3: COD of C 5 H 7 NO 2
- Question 4: Five Chemical Unit Processes
- Question 5: Partial Pressures of Digester Gas Components
- Question 6: Oxygen Required for Complete Oxidation
- Question 7: Liquid Alum Dosing and Storage for Phosphorus Removal
- Question 8: Process Flow Diagram — Wastewater to Drinking Water
- Question 9: Ten Microbiology Definitions
- Question 10: True or False
- Question 11: Effect of Nitrification on the BOD Test
- Question 12: Phases of Microbial Growth
- Question 13: Diseases Transmitted by Water
- Question 14: UV Light and Microorganisms
- Question 15: The F/M Ratio in Biological Wastewater Treatment
- Question 16: Solids Retention Time (SRT)
- Question 17: Why and How the BOD Test Is Conducted
- Question 18: Causes of Sludge Bulking
- Question 19: Why Environmental Engineers Need Microbiology
- Question 20: Diseases Spread Through the Air
May 2013
- Question 1: Order of Reaction from a Stoichiometric Equation
- Question 2: Chlorine Dosing and Contact Tank Sizing
- Question 3: Ten Chemistry Definitions
- Question 4: Alternative Disinfection Technologies
- Question 5: UV Disinfection — Advantages and Disadvantages
- Question 6: Factors Influencing Disinfectant Action
- Question 7: Suspended Solids and Percent Volatile Matter
- Question 8: Five Chemical Unit Processes in Water/Wastewater Treatment
- Question 9: Alum Dosing for Phosphorus Removal
- Question 10: Process Flow Diagram — Water Reclamation to Drinking Water Standards
- Question 11: COD of the Standard Biomass Formula C₅H₄NO₂
- Question 12: Ten Microbiology Definitions
- Question 13: Why and How UV Technology Is Used in Water/Wastewater Treatment
- Question 14: Growth Phases Based on Mass of Organisms
- Question 15: Growth Rate of Mesophilic Bacteria vs. Temperature
- Question 16: Sterilization vs. Disinfection
- Question 17: Four Waterborne Diseases
- Question 18: Nutritional Requirements — Autotrophic vs. Heterotrophic Bacteria
- Question 19: Trihalomethanes
- Question 20: The F/M Ratio in Wastewater Engineering
- Question 21: Potential Carbonaceous BOD of 1 g of Cells
- Question 22: Requirements for an Indicator Organism
- Question 23: Filtration Without Chlorination Is Only Partially Effective
- Question 24: Outdoor vs. Indoor Airborne Infection Risk
- Question 25: Rise in Non-Infectious Disease Deaths in North America Over the Past Century