GATE Environmental Engineering Solid and Hazardous Waste Management Syllabus

Solid and Hazardous Waste Management syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Solid and Hazardous Waste Management in GATE Environmental Engineering, not a summary of it.

1. 1

   Integrated solid waste management

   2 topics

   • Waste hierarchy
   • Rules and regulations for solid waste management in India
2. 2

   Municipal solid waste management

   5 topics

   • Sources
   • Generation
   • Characteristics
   • Collection and transportation
   • Waste processing and disposal
     • Reuse options
     • Biological methods
     • Energy recovery processes
     • Landfilling
3. 3

   Hazardous waste management

   4 topics

   • Characteristics
   • Generation
   • Fate of materials in the environment
   • Treatment and disposal
4. 4

   Soil contamination and leaching of contaminants into groundwater

   overview

   Examined as a single unit within Solid and Hazardous Waste Management — no further topic split in the official outline.

5. 5

   Management of biomedical waste, plastic waste and E-waste

   3 topics

   • Sources
   • Generation and characteristics
   • Waste management practices
     • Storage
     • Collection and transfer

Solid and Hazardous Waste Management flashcards for GATE Environmental Engineering

19 of 50 cards from the Solid and Hazardous Waste Management deck — real questions with worked answers.

1. What is the correct order of the integrated solid waste management (ISWM) hierarchy, from most to least preferred?

   Source reduction/prevention $\to$ Reuse $\to$ Recycling $\to$ Recovery (composting + energy recovery) $\to$ Disposal (landfilling/incineration without recovery). The most preferred is waste minimization at source; the least preferred is landfilling/disposal.

2. Which Indian rules currently govern municipal solid waste management, and which earlier rules did they replace?

   The Solid Waste Management Rules, 2016 (under the Environment (Protection) Act, 1986), which replaced the Municipal Solid Wastes (Management and Handling) Rules, 2000.

3. Under the SWM Rules 2016, into how many streams and what categories must generators segregate waste at source?

   Three streams: (1) biodegradable/wet waste, (2) non-biodegradable/dry waste (recyclables like plastic, paper, metal, glass), and (3) domestic hazardous waste (e.g., diapers, sanitary pads, mosquito repellents, used batteries).

4. Define 'municipal solid waste' (MSW).

   Solid or semi-solid waste generated from residential, commercial, institutional and other sources within a municipal area, including domestic, market, garden, street-sweeping, and treated bio-medical/industrial waste — but excluding industrial hazardous waste and untreated bio-medical waste.

5. List the major sources of municipal solid waste.

   Residential (households), commercial (shops, markets, hotels), institutional (schools, offices, hospitals), municipal services (street sweeping, parks, drains), construction and demolition, and process/treatment plant sites.

6. What is the typical per-capita MSW generation rate in Indian urban areas?

   Roughly $0.2$ to $0.6$ kg/capita/day, increasing with city size and income level. Larger metros generate near the upper end (~$0.5$–$0.6$ kg/cap/day).

7. Write the formula for the unit weight (density) of solid waste used in collection/compaction calculations.

   $$\rho = \frac{m}{V}$$ where $m$ is the mass of waste and $V$ is the volume it occupies. Density increases markedly after compaction in vehicles and landfills.

8. How is the moisture content of solid waste calculated on a wet-weight basis?

   $$M = \frac{w - d}{w} \times 100\%$$ where $w$ = initial (wet) weight of sample and $d$ = weight after drying. Indian MSW typically has high moisture (~$40$–$60\%$) due to large organic fraction.

9. Define the volume reduction (or compaction) ratio of solid waste.

   $$r = \frac{V_{i}}{V_{f}}$$ the ratio of initial (uncompacted) volume $V_{i}$ to final (compacted) volume $V_{f}$. Higher $r$ means better compaction and lower transport/landfill volume.

10. What are the main physical characteristics measured for MSW?

    Density (unit weight), moisture content, particle size and distribution, field capacity, and physical composition (% organics, paper, plastic, metal, glass, etc.).

11. What are the principal chemical characteristics of MSW relevant to processing?

    Proximate analysis (moisture, volatile combustible matter, fixed carbon, ash), ultimate analysis (C, H, O, N, S, ash), calorific value, and the C/N ratio.

12. What is the typical composition feature distinguishing Indian MSW from MSW in developed countries?

    Indian MSW has a high biodegradable/organic fraction (~$40$–$60\%$), high moisture, high inert/ash content, and a relatively low calorific value, whereas developed-country MSW has more paper/plastic and higher calorific value.

13. State the modified Dulong formula for estimating the energy (calorific) content of solid waste from its elemental composition.

    $$HHV = 337\,C + 1428\left(H - \frac{O}{8}\right) + 95\,S$$ (kJ/kg), where C, H, O, S are the mass percentages of carbon, hydrogen, oxygen and sulphur in the waste.

14. What is the ideal C/N ratio for efficient aerobic composting, and why does it matter?

    An initial C/N ratio of about $25{:}1$ to $30{:}1$ is ideal. Too high (C-rich) slows decomposition; too low (N-rich) causes nitrogen loss as ammonia and odours.

15. Compare the Hauling Cost Method (HCM) and Stationary Container System vs Hauled Container System in collection.

    In the Hauled Container System (HCS) the container itself is hauled to the disposal site and returned, suited for large/few generation points; in the Stationary Container System (SCS) the collection vehicle is loaded and the container stays in place, suited for many small sources. SCS generally has lower haul cost per pickup for dispersed sources.

16. Define the field capacity of solid waste and its significance for landfills.

    Field capacity is the maximum moisture the waste can retain against gravity; water in excess of field capacity percolates as leachate. It determines when leachate generation begins in a landfill.

17. What is a transfer station and when is it economically justified?

    A facility where waste from small collection vehicles is consolidated into larger transport vehicles before hauling to a distant disposal site. It is justified when the disposal/processing site is far from the collection area, reducing total haul cost and crew time.

18. Name the principal MSW processing techniques used to reduce volume and recover resources.

    Mechanical: shredding/size reduction, compaction (densification), screening, magnetic and air separation. Thermal: incineration, pyrolysis, gasification. Biological: composting and anaerobic digestion.

19. What is materials recovery facility (MRF) and its purpose?

    An MRF is a facility where mixed or source-separated recyclables are sorted, cleaned and processed (by manual picking, screening, magnetic/eddy-current and air separation) into marketable streams of paper, plastic, glass and metals.

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