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16-Civ-A3 Elementary Environmental Engineering: May 2015

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

  1. Question 1 Problem 1 — Material balance, reaction kinetics and microbiology
  2. Question 2 Problem 2 — Particle characteristics, chemistry of solutions and gases
  3. Question 3 Problem 3 — Urbanization, energy use and industrialization as causes of pollution
  4. Question 4 Problem 4 — Environmental ethics and wastewater
  5. Question 5 Problem 5 — Air pollution control and solid waste management
  6. Question 6 Problem 6 — Environmental impact assessment and sustainable development
  7. Question 7 Problem 7 — Water resource management, water treatment and wastewater treatment

Start with Question 1 →

Paper format. National Exams, May 2015 — 98-Civ-A3 Environmental Engineering. Three hours; closed book with one candidate-prepared double-sided aid sheet and an approved Casio or Sharp calculator. Seven problems of 20 marks each; any five constitute a complete paper and only the first five answers in the work book are marked, for a maximum of 100 marks. The complete Marking Scheme is printed on page 8 and is reproduced against each question below. All seven problems are solved here, because this set is a study resource rather than an examination script.

Reference texts.

Check: compound naming in Problem 1(i). The question names the spilled liquid “dipropylene glycol” but gives its formula as C3H8O2 and its quantity as 38 kg (500 mol). C3H8O2 has a molar mass of 76.09 g/mol, and 38 000 g / 500 mol = 76.0 g/mol — so the formula, the mass and the mole count agree exactly with each other. It is the name that is wrong: C3H8O2 is propylene glycol (dipropylene glycol is C6H14O3, 134.2 g/mol). The solution therefore uses the self-consistent set (500 mol, 76.09 g/mol) and notes the naming slip, as NOTE 1 on page 1 invites. Nothing in the answer depends on the name.