18-Env-A6, Solid Waste Engineering and Management — National Exam, May 2019. 3 hours, closed book (one double-sided aid sheet permitted). The paper's own notes state that Question 1 is compulsory and any three of the remaining four questions complete the paper; all five questions are answered in full below.
Reference texts
- Tchobanoglous, G., Theisen, H. & Vigil, S., Integrated Solid Waste Management: Engineering Principles and Management Issues — waste characterization, composting process design, landfill biological phases and leachate/gas evolution, landfill design and construction methods, landfill gas control, final cover systems.
- Qasim, S.R. & Chiang, W., Sanitary Landfill Leachate: Generation, Control and Treatment — landfill liner systems, leachate collection and treatment.
- Environment and Climate Change Canada / CCME, Guidance on the Environmental Design and Operation of Municipal Solid Waste Landfills — Canadian landfill liner, gas-control and closure/post-closure practice.
Corrections made: Q1(v) is "landfill closure and post-closure care"; Q2's third sub-part is misprinted "a." a second time in the source itself (should read "c.") and asks for the parameters defining final compost quality, 7 marks; Q3(a) covers only Phase 3 (acid phase), 12 marks, with no Phase V/methanogenic content in this question; Q4(a) asks specifically about Perimeter Interceptor Trenches and Slurry Walls as passive gas-control measures (not "flare vs other measures"); and the Q4(b) MSW composition table uses the values. Sub-part marks for every question sum exactly to the stated 25 once read from the clean PDF.
