18-Env-B5 Industrial & Hazardous Waste Management · May 2013
Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Reference texts: Nemerow & Dasgupta, Industrial and Hazardous Waste Treatment, 2nd ed.; Metcalf & Eddy, Wastewater Engineering: Treatment and Resource Recovery, 5th ed.; Davis & Cornwell, Introduction to Environmental Engineering, 6th ed.; LaGrega, Buckingham & Evans, Hazardous Waste Management, 2nd ed.; CCME, Guidelines for the Management of Biomedical Waste in Canada (1992); Canadian Nuclear Safety Commission (CNSC) regulatory framework and NWMO Adaptive Phased Management; Canadian Environmental Protection Act (CEPA), 1999.
All nineteen questions are compulsory on this paper and are answered in full below.
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.
Untreated biomedical waste is managed by category because each carries a different combination of infectious, aesthetic and regulatory concern, and the appropriate disposal option follows directly from that combination.
| Waste category | Primary hazard | Disposal option(s) |
|---|---|---|
| Human anatomical waste (recognizable tissue, organs, body parts) | Infectious agents; strong ethical/aesthetic sensitivity | Incineration (preferred, with respectful handling protocols) or interment/cremation under health-authority approval; never routine landfill |
| Animal waste (carcasses, tissue from research/veterinary/diagnostic use) | Infectious agents; zoonotic disease potential | Incineration; alternatively, steam sterilization (autoclaving) followed by disposal as general solid waste at an approved landfill, where permitted |
| Microbiology laboratory waste (cultures, stocks, contaminated media/labware) | Concentrated viable pathogens | Autoclave sterilization on-site before disposal (or incineration) — must be rendered non-viable before it leaves the containment of the generating facility |
| Human blood and body fluids | Bloodborne pathogens (Hepatitis B/C, HIV) | Small volumes: disinfection (chemical or steam) then sanitary sewer discharge, subject to local sewer-use bylaw approval; larger volumes/solid-saturated materials: incineration |
| Waste sharps (needles, scalpels, broken glass) | Puncture injury combined with bloodborne-pathogen transmission risk | Segregated at the point of generation into rigid, puncture-resistant, sealed containers; then incineration or, where approved, encapsulation/chemical treatment followed by landfill — never compacted with general waste |
Two principles cut across every row of the table. First, segregation at the point of generation into the correct waste stream is what makes any of these disposal options viable — once biomedical waste is co-mingled with general solid waste, the entire mixed load must be managed at the higher (biomedical) standard. Second, the common thread across incineration, autoclaving and chemical disinfection is that each renders the waste non-infectious (or, for anatomical waste, appropriately disposed of) before it leaves controlled handling, consistent with the national CCME guideline's core principle that biomedical waste is treated at or very near its point of generation rather than transported untreated for offsite disposal.
