18-Env-A6 Solid Waste Engineering and Management · December 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.
This paper prints marks IN FRONT of the question number on every line (e.g. "5 1. What are the elements…", "4 16. All 29 questions are answered in full.
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) On-site collection and treatment in a dedicated leachate treatment plant (biological + physical/chemical treatment) prior to discharge. (2) Collection and off-site discharge to a municipal wastewater treatment plant (with or without on-site pretreatment) under a sewer-use/discharge agreement. (3) Leachate recirculation back into the waste mass (the "bioreactor landfill" approach), which accelerates waste stabilization and gas generation while reducing the net volume requiring external disposal. (4) Evaporation (natural evaporation ponds, or mechanically assisted/forced evaporation), reducing leachate volume where climate and land area permit. Additional accepted options include hauling to an off-site treatment facility by tanker truck and, at closure, long-term passive management combined with continued monitoring as generation rates decline.
