18-Env-A4 Water and Wastewater Engineering
Worked solutions to 14 past sittings (2013–2019), 71 questions. Pick a sitting, or start from a topic below.
- December 2019
- December 2018
- May 2018
- December 2017
- May 2017
- December 2016
- May 2016
- December 2015
- May 2015
- December 2014
- May 2014
- December 2013
- May 2013
- Undated paper
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.
- Wastewater Terminology (6 sittings): May 2018 Q4 · May 2017 Q4 · December 2016 Q1 · May 2016 Q1 · December 2015 Q1 · May 2015 Q1
- Wastewater Engineering Definitions (4 sittings): December 2019 Q1 · December 2018 Q1 · May 2018 Q1 · May 2017 Q1
- Activated Sludge (3 sittings): December 2018 Q5 · December 2017 Q5 · December 2013 Q5
- Breakpoint Chlorination (3 sittings): December 2019 Q4 · December 2018 Q4 · December 2017 Q4
- Brief Descriptions (3 sittings): December 2019 Q5 · December 2016 Q5 · May 2016 Q5
- Ozonation (3 sittings): May 2018 Q2 · December 2014 Q2 · Undated paper Q2
- Primary Clarifier Design (3 sittings): May 2017 Q5 · December 2015 Q5 · December 2014 Q5
- Aeration Tank Sizing (2 sittings): December 2017 Q5 · December 2013 Q5
- Alkalinity from a Double Titration (2 sittings): May 2018 Q3 · May 2017 Q3
- Anaerobic Digestion (2 sittings): May 2016 Q4 · December 2013 Q6
- Chlorination (2 sittings): May 2016 Q2 · Undated paper Q2
- Discrete Settling Theory (2 sittings): December 2017 Q2 · December 2013 Q1
- Drinking Water Suitability (2 sittings): December 2019 Q4 · December 2018 Q4
- Four Pairs Differentiated (2 sittings): May 2018 Q4 · May 2017 Q4
- Indicator Organisms (2 sittings): December 2017 Q2 · December 2013 Q1
Questions by sitting
December 2019
- Question 1: Water and Wastewater Engineering Definitions
- Question 2: Sludge Digestion and Nitrogen Removal
- Question 3: Wastewater Treatment Plant Process Schematic
- Question 4: Breakpoint Chlorination and Drinking Water Suitability
- Question 5: Brief Descriptions — Water Treatment Concepts
December 2018
- Question 1: Water and Wastewater Engineering Definitions
- Question 2: Discrete Particle Settling and the Trickling Filter
- Question 3: Water Treatment Plant Process Schematic
- Question 4: Breakpoint Chlorination and Drinking Water Suitability
- Question 5: Activated Sludge — Waste Sludge Production and Aeration Tank Volume
May 2018
- Question 1: Water and Wastewater Engineering Definitions
- Question 2: Coagulation-Flocculation Mechanisms and Ozonation
- Question 3: pH Significance and Alkalinity from a Double Titration
- Question 4: Wastewater Terminology — Four Pairs Differentiated
- Question 5: Secondary Clarifier Loading and Return Sludge Concentration
December 2017
- Question 1: Wastewater and Process Parameter Definitions
- Question 2: Discrete Settling Theory & Indicator Organisms
- Question 3: Water Treatment Process Schematic
- Question 4: Breakpoint Chlorination & Water Treatment Definitions
- Question 5: Activated Sludge – Waste Sludge Volume and Aeration Tank Sizing
May 2017
- Question 1: Water and Wastewater Engineering Definitions
- Question 2: Water Treatment Plant Process Schematic
- Question 3: pH Significance and Alkalinity from a Double Titration
- Question 4: Wastewater Terminology — Four Pairs Differentiated
- Question 5: Primary Clarifier Design
December 2016
- Question 1: Definitions — Water and Wastewater Terminology
- Question 2: Nitrogen Species and Removal; Chlorination Chemistry vs. UV Disinfection
- Question 3: Raw Water Intake Structures; BOD Test with Temperature Correction
- Question 4: Water Distribution System Layout; Anaerobic Digestion of Sludge
- Question 5: Brief Descriptions — Water and Wastewater Treatment Concepts
May 2016
- Question 1: Definitions — Water and Wastewater Terminology
- Question 2: Phosphorus Speciation/Removal and Chlorination vs. UV Disinfection
- Question 3: pH in Water Treatment; Carbonaceous BOD and Ultimate BOD
- Question 4: Alkalinity Titration Classification; Anaerobic Digestion
- Question 5: Brief Descriptions — Water and Wastewater Treatment Concepts
December 2015
- Question 1: Water and Wastewater Terminology
- Question 2: Disinfection and Water Treatment Unit Processes
- Question 3: Lagoon Treatment and the BOD Test
- Question 4: Biological and Physical Treatment Unit Processes
- Question 5: Primary Clarifier Design
May 2015
- Question 1: Definitions — Water and Wastewater Terminology
- Question 2: Alkalinity/Nitrification and Chlorination Disinfection
- Question 3: pH in Water Treatment; BOD Test Calculation
- Question 4: Water/Wastewater Treatment Unit Processes
- Question 5: Activated Sludge WWTP — Process Flow Diagram
December 2014
- Question 1: Water/Wastewater Terminology
- Question 2: Water Quality Ions and Ozonation
- Question 3: pH and Alkalinity
- Question 4: Biological Treatment and Nutrient Terminology
- Question 5: Primary Clarifier Design
May 2014
December 2013
- Question 1: Discrete Settling Theory & Indicator Organisms
- Question 2: Water Treatment Process Schematic
- Question 3: Chlorination Curve & Coagulation/Settling Concepts
- Question 4: Wastewater Parameter Definitions
- Question 5: Activated Sludge — WAS Volume and Aeration Tank Sizing
- Question 6: Oxygen/Air Requirement and Anaerobic Digestion
May 2013
- Question 1: Water/Wastewater Parameter Definitions
- Question 2: Hardness Titration, the BOD Blank, and BOD of Raw Sewage
- Question 3: Rapid Sand Filtration and Chlorination Practice
- Question 4: Secondary Clarifier Sizing and Return Activated Sludge
- Question 5: Anaerobic Sludge Digestion
Undated paper
- Question 1: Water/Wastewater Parameter Definitions
- Question 2: Alkalinity Titration; Ozonation vs. Chlorination
- Question 3: Secondary Clarifier Sizing, Solids Loading and SRT
- Question 4: Wastewater Treatment Term Pairs
- Question 5: BOD with Seed Correction; Anaerobic Digestion Stages