Solid Waste Management

Solid Waste - Trash Talk Basics

• Definition: Unwanted, non-liquid materials from human/animal activities, deemed useless.
• Key Types & Sources:
  • Municipal Solid Waste (MSW): Residential, commercial (e.g., food scraps, paper, plastics, glass).
  • Biomedical Waste (BMW): Healthcare facilities (e.g., sharps, anatomical waste, soiled dressings). Regulated by BMW Management Rules, 2016.
  • Hazardous Waste: Industrial, laboratory (e.g., chemicals, solvents, paints, batteries).
  • E-waste (Electronic Waste): Discarded electrical/electronic devices (e.g., computers, mobile phones).
• Adverse Impacts:
  • Health: Vector-borne diseases (flies, rodents), respiratory illnesses (air pollution from burning), injuries (sharps).
  • Environmental: Soil & water pollution (leachate), air pollution (open burning), greenhouse gas (methane from landfills).

⭐ India generates approximately 1.5 lakh metric tonnes of Municipal Solid Waste (MSW) per day.

Waste Hierarchy - Order Outta Chaos

• A preferred sequence for managing waste, minimizing environmental burden and maximizing resource use.
• Visualized as an inverted pyramid, guiding choices from most to least desirable.
• 📌 Core: The 5Rs outline the preferred order:

• Key for success:
  • Source Segregation: Fundamental. Generators must separate waste (biodegradable, non-biodegradable, domestic hazardous) at origin.
  • Efficient Collection & Transportation: Organized collection of segregated waste and transport to appropriate facilities.
• This hierarchy underpins sustainable solid waste management.

⭐ SWM Rules, 2016 (India): Mandate source segregation by generators; direct local bodies to promote this hierarchy.

Disposal Drama - End of the Line

• Landfills: Final waste destination.
  • Open Dumping: Uncontrolled; vector breeding, pollution. Avoid.
  • Sanitary Landfill: Engineered; controlled disposal.
    • Daily soil cover (15-30 cm).
    • Leachate collection & treatment system.
    • Gas (methane) management & recovery.
    • Site: >500m from habitation/water sources.
• Incineration: High-temp ($>$850°C) combustion.
  • Reduces waste volume by ~90%; allows energy recovery.
  • Risks: Air pollution (dioxins, furans if incomplete combustion); ash requires safe disposal.
• Composting: Aerobic biological decomposition of organic waste.
  • Produces humus (soil conditioner).
  • Ideal Carbon/Nitrogen (C/N) ratio: 25-30:1.
  • Methods: Indore (aerobic), Bangalore (anaerobic - less ideal).
• Vermicomposting: Uses earthworms (e.g., Eisenia fetida, Eudrilus eugeniae).
  • Faster than composting; produces nutrient-rich vermicast.

⭐ Leachate, the toxic liquid draining from decomposing waste in landfills, poses a significant risk of groundwater contamination if not properly managed through impermeable liners and collection systems. It typically has high BOD and COD values.

BMW Management - Handle With Care

• Definition: Waste from diagnosis, treatment, immunization (human/animal), research, biologicals.
• Legislation: BMW Management Rules, 2016 (India).
• Segregation (at source): Crucial. Color-coded bags/containers.
  • Yellow: Human/animal anatomical, soiled, expired meds, chemical, microbiology.
    • Treatment: Incineration/Plasma Pyrolysis/Deep Burial. Microbiology: Autoclave/Microwave.
  • Red: Contaminated recyclable plastics (syringes, catheters, IV sets).
    • Treatment: Autoclave/Microwave → Shred/Recycle.
  • White (Translucent): Sharps (needles, blades).
    • Treatment: Autoclave/Dry Heat Sterilization (DHS) → Shred/Encapsulate.
  • Blue: Glassware, metallic implants.
    • Treatment: Autoclave/Microwave → Recycle.
• Key Treatments:
  • Autoclave: Steam $121°C, 15 psi, 30-60 min.
  • Incineration: Primary 800±50°C, Secondary 1050±50°C.

⭐ Untreated human anatomical waste and microbiology waste must not be stored beyond 48 hours.

High‑Yield Points - ⚡ Biggest Takeaways

• Sanitary landfill: Most common for MSW; requires daily 20cm earth cover.
• Incineration: For biomedical waste; ~90% volume reduction; causes air pollution.
• Composting: Aerobic decomposition of organic waste (e.g., Bangalore method).
• BMW Rules: Mandate source segregation via color-coded bags (Yellow, Red, White, Blue).
• Leachate: From landfills, a key source of groundwater contamination.
• ISWM: Prioritizes Source Reduction, Reuse, Recycling over disposal.
• Autoclaving/Microwaving: Important non-burn disinfection for BMW.