23-Chem-B2 Environmental Engineering
Worked solutions to 12 past sittings (2013–2019), 84 questions. Pick a sitting, or start from a topic below.
- December 2019
- December 2018
- May 2018
- 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.
- Ion exchange (10 sittings): December 2019 Q4 · December 2018 Q5 · December 2016 Q5 · May 2016 Q4 · December 2015 Q5 · May 2015 Q4 · December 2014 Q4 · May 2014 Q4 · December 2013 Q4 · Undated paper Q4
- PH control (10 sittings): December 2019 Q4 · December 2018 Q5 · December 2016 Q5 · May 2016 Q4 · December 2015 Q5 · May 2015 Q4 · December 2014 Q4 · May 2014 Q4 · December 2013 Q4 · Undated paper Q4
- Photochemical smog (9 sittings): May 2018 Q7 · December 2016 Q7 · May 2016 Q6 · May 2015 Q6 · December 2014 Q6 · May 2014 Q6 · December 2013 Q6 · May 2013 Q6 · Undated paper Q6
- Odour Control (8 sittings): December 2019 Q5 · December 2018 Q7 · May 2018 Q7 · December 2016 Q7 · May 2016 Q6 · May 2014 Q6 · May 2013 Q6 · Undated paper Q6
- Soil Remediation (7 sittings): December 2019 Q3 · December 2018 Q3 · May 2018 Q3 · December 2016 Q3 · May 2016 Q7 · May 2013 Q2 · Undated paper Q7
- Dissolved air flotation (6 sittings): May 2018 Q4 · December 2015 Q4 · May 2015 Q3 · December 2014 Q3 · December 2013 Q3 · May 2013 Q1
- Vapours (6 sittings): December 2019 Q1 · December 2018 Q2 · May 2015 Q2 · December 2014 Q2 · May 2013 Q4 · Undated paper Q2
- Gases (5 sittings): December 2019 Q1 · December 2018 Q2 · December 2013 Q2 · May 2013 Q4 · Undated paper Q2
- Activated Sludge Design (4 sittings): December 2019 Q4 · December 2018 Q5 · May 2018 Q5 · Undated paper Q4
- Activated-sludge process design (4 sittings): December 2015 Q5 · May 2015 Q4 · December 2014 Q4 · December 2013 Q4
- Emission-reduction measures (4 sittings): December 2015 Q6 · May 2015 Q5 · December 2014 Q5 · December 2013 Q5
- BOD dilution-test analysis (3 sittings): December 2015 Q4 · May 2015 Q3 · December 2014 Q3
- Control Methods for Particulates (3 sittings): December 2019 Q1 · December 2018 Q2 · Undated paper Q2
- Fabric filters (3 sittings): December 2015 Q2 · December 2014 Q2 · May 2013 Q4
- Measurement Techniques (3 sittings): December 2019 Q3 · December 2018 Q3 · Undated paper Q7
Questions by sitting
December 2019
- Question 1: Control Methods for Particulates, Gases and Vapours
- Question 2: Air/Water Pollution Abatement and Nutrient Removal
- Question 3: Soil Remediation and Measurement Techniques
- Question 4: pH Control, Ion Exchange, Reverse Osmosis and Activated Sludge Design
- Question 5: Photochemical Reactions, Noxious Pollutants and Odour Control
- Question 6: Water Contaminant Characterization, BOD and Sedimentation
- Question 7: Sources and Dispersion of Atmospheric Pollutants
December 2018
- Question 1: Air Pollution Abatement, Effluent Treatment and Surface Water Treatment
- Question 2: Control Methods for Particulates, Gases and Vapours
- Question 3: Soil Remediation and Measurement Techniques
- Question 4: Water Contaminant Characterization, BOD and Aeration Design
- Question 5: Flotation, pH Control, Ion Exchange and Activated Sludge Design
- Question 6: Sources and Dispersion of Atmospheric Pollutants
- Question 7: Photochemical Reactions, Noxious Pollutants and Odour Control
May 2018
- Question 1: Water Treatment Principles and VOC Adsorber Design
- Question 2: Particulate, Gas and Vapour Control Technologies
- Question 3: Soil Remediation and Environmental Sampling
- Question 4: Water Quality Measurement, BOD Test and Dissolved Air Flotation
- Question 5: pH Control / Ion Exchange / RO and Activated Sludge Design
- Question 6: Atmospheric Dispersion of SO2/NOx
- Question 7: Photochemical Smog and Odour Control
December 2016
- Question 1: Wastewater Treatment Principles, ESP and Baghouse Design
- Question 2: Particulate, Gas and Vapour Control Technologies
- Question 3: Soil Remediation and Measurement Quality
- Question 4: Water Quality Characterization, BOD and DAF
- Question 5: pH Control, Ion Exchange, RO and Extended-Aeration Activated Sludge
- Question 6: Atmospheric Dispersion of SO2
- Question 7: Photochemical Smog and Odour Control
May 2016
- Question 1: Air & Water Pollution Abatement, Ammonia Removal
- Question 2: Control of Particulates, Toxic Gases and Odorous Vapours
- Question 3: Water Contaminants, BOD and Flotation
- Question 4: pH Control, Ion Exchange, Reverse Osmosis and Activated Sludge
- Question 5: Atmospheric Dispersion of SO2
- Question 6: Photochemical Smog, Halogenated Hydrocarbons and Odour Control
- Question 7: Soil Remediation and Measurement Technique Quality
December 2015
- Question 1: Wastewater treatment-step design principles, and cyclone/scrubber design considerations for particulate and corrosive-gas control
- Question 2: Application ranges of gravimetric settlers, electrostatic precipitators and fabric filters
- Question 3: PCB soil remediation, and reliability/reproducibility in air-quality measurement
- Question 4: Water-quality parameter measurement, BOD dilution-test analysis, and dissolved air flotation
- Question 5: pH control, ion exchange and reverse osmosis mechanisms, and activated-sludge process design
- Question 6: Gaussian plume dispersion of a coal-fired power-plant SO₂ stack, and emission-reduction measures
- Question 7: Photochemical smog reactions, engineered benzene control, and biological rendering-plant odour control
May 2015
- Question 1: Total-nitrogen removal treatment train, and engineered air pollution control for VOCs, particulates and air toxics
- Question 2: Oxidation, condensation and adsorption technologies for gases, vapours and aerosols
- Question 3: Drinking-water contaminant treatment, BOD dilution-test analysis, and dissolved air flotation
- Question 4: pH control, ion exchange and reverse osmosis design principles, and activated-sludge process design
- Question 5: Gaussian plume dispersion of a power-plant SO₂ stack, and emission-reduction measures
- Question 6: Photochemical smog, halogenated-hydrocarbon destruction, and industrial odour control
- Question 7: Heavy-metal soil remediation for park redevelopment, and measurement-technique quality metrics
December 2014
- Question 1: Ambient air-quality unit conversion and monitoring, source-vs-ambient SO₂ standards, and phosphorus removal
- Question 2: Fabric filters, thermal oxidizers and adsorption towers for particulate, vapour and gas control
- Question 3: Surface-water contaminant monitoring, BOD dilution-test analysis, and dissolved air flotation
- Question 4: pH control, ion exchange and reverse osmosis design principles, and activated-sludge process design
- Question 5: Gaussian plume dispersion of a power-plant SO₂ stack, and emission-reduction measures
- Question 6: Photochemical smog, chlorinated-hydrocarbon destruction, and industrial odour control
- Question 7: Soil remediation of a hydrocarbon-impacted aquifer, bioremediation, and measurement-technique quality metrics
May 2014
- Question 1: Engineered air pollution control methods, and nitrogen/phosphorus management in sewage effluent
- Question 2: Control technologies for particulates, toxic gases, and odorous vapours
- Question 3: Groundwater contaminant characterization, BOD testing, and sedimentation tank design
- Question 4: pH control, ion exchange, reverse osmosis design principles, and activated sludge process design
- Question 5: Gaussian plume dispersion of a coal-fired power plant SO₂ stack
- Question 6: Photochemical smog, halogenated-hydrocarbon control, and odour control
- Question 7: Contaminated soil remediation, and measurement technique quality (sensitivity, reliability, accuracy)
December 2013
- Question 1: Particulate air-pollution control and nutrient (N, P) upgrade of a primary WWTP
- Question 2: Membrane, condensation and adsorption technologies for particulates, gases and odorous vapours
- Question 3: Surface-water contaminant monitoring, BOD test analysis, and dissolved air flotation
- Question 4: pH control, ion exchange, reverse osmosis applications, and activated-sludge process design
- Question 5: Gaussian plume dispersion of a power-plant SO₂ stack, and emission-reduction measures
- Question 6: Photochemical smog, chlorinated-hydrocarbon destruction, and sulfur-odour control
- Question 7: Soil remediation technologies, and measurement-technique sensitivity, reliability and accuracy
May 2013
- Question 1: Phosphorus removal, BOD test analysis, and dissolved air flotation
- Question 2: Soil remediation and effluent-monitoring statistics
- Question 3: Particulate air control, ammonia toxicity, and buffer strips
- Question 4: Fabric filters, absorption, and catalytic reactors for particulates, gases and vapours
- Question 5: Gaussian plume dispersion of a power-plant SO₂ stack
- Question 6: Photochemical smog, halogenated-hydrocarbon control, and odour control
- Question 7: pH control / ion exchange / RO design principles, and activated sludge process design
Undated paper
- Question 1: Air/Water Pollution Abatement and TSS Loading
- Question 2: Control Methods for Particulates, Gases and Vapours
- Question 3: Contaminants, BOD and Secondary Sedimentation
- Question 4: pH Control, Ion Exchange, Reverse Osmosis and Activated Sludge Design
- Question 5: Gaussian Plume Dispersion of SO₂
- Question 6: Photochemical Smog, Noxious Pollutants and Odour Control
- Question 7: Soil Remediation and Measurement Techniques