16-Civ-B5 Water Supply and Wastewater Treatment, December 2016: worked solutions

Paper format. National Examination, December 2016 — 98-Civ-B5 Water Supply and Wastewater Treatment. Three hours; closed book with one aid sheet written on both sides; an approved calculator is permitted. Question 1 is compulsory and the candidate attempts any three of the remaining four questions, each worth 25 marks, for 100 marks in total. Marks are shown at the end of each question. All five questions are worked below, because the set is a study resource rather than an exam script.

Reference texts.

Metcalf & Eddy / AECOM, Wastewater Engineering: Treatment and Resource Recovery, 5th ed. — Ch. 2 (characteristics), Ch. 7 (fundamentals of biological treatment), Ch. 8 (suspended-growth), Ch. 9 (attached-growth), Ch. 13 (anaerobic digestion).
Davis & Cornwell, Introduction to Environmental Engineering, 5th ed. — Ch. 6 (water quality, softening, filtration, disinfection), Ch. 9 (wastewater).
Crittenden et al., MWH's Water Treatment: Principles and Design, 3rd ed. — Ch. 11 (granular filtration), Ch. 13 (disinfection), Ch. 8 (UV).
Health Canada, Guidelines for Canadian Drinking Water Quality (turbidity, E. coli, disinfection by-products); CCME, Canadian Environmental Quality Guidelines; APHA/AWWA/WEF, Standard Methods for the Examination of Water and Wastewater, 23rd ed.

Check — illustrative numbers. Questions 1 to 4 of this paper are discussion questions and print no data. Every numerical value used in those four answers (alkalinity, hardness, chlorine dose, UV dose, backwash volume, methane yield) is the solver's own representative value, chosen to be typical of Canadian municipal practice and used only to make a mechanism concrete. Question 5(b) is the paper's only true calculation, and it is solved entirely from the data the question prints.

16-Civ-B5 Water Supply and Wastewater Treatment: December 2016