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16-Civ-B5 Water Supply and Wastewater Treatment: December 2019

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

  1. Question 1 Define and Differentiate
  2. Question 2 pH and Disinfection Efficiency; Indicator Organisms
  3. Question 3 Ammonia in Effluents; Activated Sludge with Anaerobic Digestion
  4. Question 4 Coagulation Mechanisms; Water Distribution Systems
  5. Question 5 Discharge and Velocity in a Partly Full Sewer

Start with Question 1 →

Paper format. National Examination, December 2019 — 16-Civ-B5 Water Supply and Wastewater Treatment. Three hours; closed book with one aid sheet written on both sides; an approved Casio or Sharp calculator is permitted. Question 1 is compulsory; attempt any three of the remaining four. All five questions carry 25 marks, so the paper is marked out of 100. Every question is solved here, because the complete set is the study resource.

Reference texts for this subject. Metcalf & Eddy / Tchobanoglous, Stensel, Tsuchihashi & Burton, Wastewater Engineering: Treatment and Resource Recovery, 5th ed. (McGraw-Hill) — the primary reference for Q1(ii)–(iv), Q3 and Q5. Crittenden et al., MWH's Water Treatment: Principles and Design, 3rd ed. (Wiley) — coagulation, disinfection and filtration for Q1(i), Q1(v), Q2 and Q4(a). Davis, Water and Wastewater Engineering: Design Principles and Practice (McGraw-Hill) and Mihelcic & Zimmerman, Environmental Engineering: Fundamentals, Sustainability, Design (Wiley) — distribution systems and sewer hydraulics for Q4(b) and Q5. Canadian regulatory frame: Guidelines for Canadian Drinking Water Quality (Health Canada), the Canadian Environmental Quality Guidelines (CCME) for ammonia, and the federal Wastewater Systems Effluent Regulations (SOR/2012-139).

Check — assumptions declared once, used throughout. The paper supplies no water-quality data for Q1–Q4, so every illustrative number below is the solver's own representative value, clearly labelled where it is introduced; the marks lie in the definitions and the reasoning, and the numbers are there to make each distinction concrete. Free-chlorine speciation uses pKa = 7.54 at 25 °C; ammonia speciation uses the Emerson relation. Q5 is solved from the supplied partial-flow curves and independently from the exact circular-segment geometry.