Growth, Industrialization and Urbanization Impacts: 16-Civ-A3 Elementary Environmental Engineering, December 2017, Q4

Question 4 of 7: Growth, Industrialization and Urbanization Impacts

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

Notes on this paper

Paper format. National Exams, December 2017 — 16-Civ-A3 Elementary Environmental Engineering. Three hours; closed book with one candidate-prepared 8½ × 11 double-sided aid sheet; approved Casio or Sharp calculator only. Seven problems are printed, each worth 20 marks, and any five constitute a complete paper (maximum 100 marks). All seven are solved here, because the set is intended as a study resource rather than an exam script. Section marks are shown in brackets at the left margin of each question and are reproduced from the final-page Marking Scheme.

Reference texts.

Davis, M.L. & Cornwell, D.A., Introduction to Environmental Engineering, 5th ed., McGraw-Hill — material and energy balances, reactor kinetics, hardness, disinfection, water and wastewater unit processes.
Masters, G.M. & Ela, W.P., Introduction to Environmental Engineering and Science, 3rd ed., Pearson — mass/energy balances on power plants, air-emission estimation, growth–pollution linkages.
Mihelcic, J.R. & Zimmerman, J.B., Environmental Engineering: Fundamentals, Sustainability, Design, 3rd ed., Wiley — sustainability, life-cycle thinking, environmental impact assessment, professional ethics.
Metcalf & Eddy / AECOM, Wastewater Engineering: Treatment and Resource Recovery, 5th ed., McGraw-Hill — clarification, activated sludge, nutrient removal, effluent management.
Fogler, H.S., Elements of Chemical Reaction Engineering, 5th ed., Prentice Hall — CSTR design and gas-phase stoichiometry with change in total moles.

Canadian context. Answers use the Canadian regulatory frame: the Guidelines for Canadian Drinking Water Quality (GCDWQ) and Canadian Environmental Quality Guidelines (CCME), provincial water and wastewater regulations, the federal Impact Assessment Act / BC Environmental Assessment Act, and the Engineers Canada / EGBC code of ethics whose canons appear in Problem 2(iii).

Question 4: Growth, Industrialization and Urbanization Impacts (20 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

The 2 × 3 matrix below gives, for each growth driver, a major impact and a corresponding engineering solution in each of the two media — air emissions and wastewater. The organising principle is that growth increases both the mass loading and the concentration of pollutants, and the engineering response is to intercept, treat or avoid that loading at source.

Impacts and engineering solutions by growth driver (rows = medium, columns = driver)
Medium	(i) Population growth	(ii) Industrial expansion	(iii) Urbanization expansion
Air emissions	Impact: more vehicles and home/energy combustion → higher NO_x, PM and CO₂. Solution: shift to public/electric transit and low-emission district energy; efficiency standards.	Impact: concentrated stack emissions of SO₂, NO_x, PM and VOCs / toxics. Solution: stack controls — scrubbers, baghouses/ESPs, SCR for NO_x, vapour recovery — with continuous monitoring.	Impact: traffic congestion and the urban heat island raise ground-level ozone and PM. Solution: compact transit-oriented planning, green space, and low-emission-zone controls.
Wastewater	Impact: larger sewage volume and nutrient (N, P) load exceeding plant capacity. Solution: expand/upgrade to secondary + nutrient removal; water conservation to cut per-capita flow.	Impact: high-strength, toxic or variable industrial effluent that upsets biological treatment. Solution: enforce sewer-use by-laws and require on-site pre-treatment/equalisation before discharge.	Impact: increased impervious area → storm runoff and combined-sewer overflows carrying pollutants. Solution: low-impact development (bioswales, permeable paving, storage) and sewer separation/CSO control.

Across all three drivers the same two-part logic applies: identify whether growth raises the volume of flow, the concentration of contaminants, or both, and choose a source-control, treatment or planning measure that keeps the loading within the assimilative capacity of the air-shed and the receiving water even under the assumed stricter requirements.