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Solid & Hazardous Waste Management
Hazardous & Biomedical Waste
Hazard characteristics, treatment hierarchy, incineration and colour-coded biomedical-waste segregation.
PART 1
Topic Breakdown & Traps
The Engineering Principle
Hazardous waste exhibits ignitability, corrosivity, reactivity or toxicity and demands special handling, treatment and secure disposal. The preferred hierarchy is reduce → recycle → treat → secure landfill. Incineration destroys organic and infectious wastes at high temperature with adequate residence time. Biomedical waste is segregated at source by a colour-coded system under the BMW Rules.
The Core Formula Matrix
Hazard characteristics: ignitable, corrosive, reactive, toxic.
Management hierarchy: minimisation → recycling → treatment → secure landfill.
Incinerator: ≈ 850–1100 °C with ~2 s residence to destroy pathogens/dioxins.
BMW colour codes: yellow (incinerable/anatomical), red (contaminated plastics), white (sharps), blue (glass/metals).
Management hierarchy: minimisation → recycling → treatment → secure landfill.
Incinerator: ≈ 850–1100 °C with ~2 s residence to destroy pathogens/dioxins.
BMW colour codes: yellow (incinerable/anatomical), red (contaminated plastics), white (sharps), blue (glass/metals).
The ‘IIT Traps’
- ⚠Yellow bag = anatomical/incinerable, red = contaminated recyclable plastics — don't swap.
- ⚠Adequate temperature AND residence time are both needed to destroy dioxins.
- ⚠Secure landfill is the last resort, after minimisation/recycling/treatment.
📚 Standard references
- Hazardous Waste Management — LaGrega, Buckingham & Evans
PART 2
Progressive 3-Tier Question Suite
Q1BASIC1 Mark · MCQ
Which of the following is NOT a defining characteristic of hazardous waste?
Q2MEDIUM1 Mark · MCQ
Under colour-coded biomedical-waste segregation, anatomical and soiled waste destined for incineration is placed in the:
Q3HARD2 Marks · MCQ
Maintaining ~1000 °C with ~2 s gas residence time in a hazardous-waste incinerator is essential primarily to: