NivaarExam PrepOfficial exam papers ↗

18-Env-A4 Water and Wastewater Engineering: Undated paper

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

  1. Question 1 Water/Wastewater Parameter Definitions
  2. Question 2 Alkalinity Titration; Ozonation vs. Chlorination
  3. Question 3 Secondary Clarifier Sizing, Solids Loading and SRT
  4. Question 4 Wastewater Treatment Term Pairs
  5. Question 5 BOD with Seed Correction; Anaerobic Digestion Stages

Start with Question 1 →

National Exams — May 2019 — 18-Env-A4 / Water and Wastewater Engineering. 3 hours duration; closed book with one double-sided aid sheet; approved Casio/Sharp calculator permitted. Question 1 is compulsory; the paper instructs candidates to attempt any three of the remaining four (100 marks total); all five are solved below for completeness.

Reference texts. Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery (5th ed.) — BOD kinetics, activated-sludge/clarifier design, anaerobic digestion; Davis & Cornwell, Introduction to Environmental Engineering (6th ed.) — alkalinity chemistry, disinfection, coagulation/flocculation; MWH’s Water Treatment: Principles and Design (3rd ed.) — ozonation, turbidity; Standard Methods for the Examination of Water and Wastewater — alkalinity titration (2320B).