18-Env-A6 Solid Waste Engineering and Management · May 2014
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Reference texts: Tchobanoglous, Theisen & Vigil, Integrated Solid Waste Management: Engineering Principles and Management Issues; Vesilind, Worrell & Reinhart, Solid Waste Engineering; Davis & Cornwell, Introduction to Environmental Engineering (6th ed.); CCME, Guidance Document on Landfill Gas Management; Canadian Environmental Protection Act, 1999.
Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.
(1) Collection and treatment then discharge — biological or physicochemical treatment (on-site or by co-treatment at a municipal wastewater treatment plant) followed by discharge under permit to sewer or surface water. (2) Leachate recirculation (bioreactor-landfill operation) — re-injecting collected leachate into the waste mass, which accelerates waste stabilization and reduces net leachate volume through evapotranspiration and absorption back into the refuse. (3) Evaporation — natural or engineered evaporation ponds/systems that reduce the volume of leachate requiring off-site management. (4) Off-site hauling for disposal — tanker-truck transport to a licensed municipal wastewater treatment plant or other approved facility (e.g., deep-well injection), typically used where on-site treatment is not economical for the volume generated.
