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Q9(c):
Discuss briefly the following:
(c) Municipal solid wastes
Solution :
Definition and Composition of Municipal Solid Wastes (MSW)
Municipal Solid Waste (MSW), commonly referred to as trash or garbage, encompasses all solid waste generated by households, offices, stores, schools, hospitals, and other commercial and institutional establishments. [Per the Solid Waste Management Rules under the Environment Protection Act].
Categorization of MSW Components
MSW is highly heterogeneous. The classification typically follows these three functional categories:
- Biodegradable Waste: Organic matter such as food scraps, kitchen waste, garden trimmings, and paper. This is amenable to biological decomposition.
- Recyclable Waste: Non-biodegradable but recoverable materials including plastics, glass, metals, and paper/cardboard.
- Inert/Hazardous Waste: Debris, ash, street sweepings, and toxic biomedical wastes that require specialized disposal protocols.
Schematic Representation of Waste Management Hierarchy
Methods of Disposal and Environmental Impact
| Method | Mechanism | Environmental Consideration |
|---|---|---|
| Open Dumping | Unregulated disposal in low-lying areas. | Serves as a breeding ground for vectors (flies, mosquitoes) and produces toxic leachate. |
| Sanitary Landfills | Compacting waste and covering it with earth layers. | Engineered to prevent groundwater contamination via liners. |
| Incineration | Controlled burning of waste at high temperatures. | Reduces volume significantly; however, requires scrubbers to manage air pollutants. |
Analysis of Leachate Formation
When rainwater percolates through waste piles, it dissolves soluble organic and inorganic compounds, creating a toxic liquid known as leachate. This fluid possesses high $BOD$ (Biochemical Oxygen Demand) and can infiltrate aquifers, leading to groundwater pollution and heavy metal toxicity, which is a major ecological concern in urban centers. [By the Principle of Environmental Toxicology].
Integrated Management Strategy
Effective management of MSW necessitates the "3R" approach: Reduce the volume of waste generated, Reuse materials before disposal, and Recycle items into new products. Composting represents a critical biological solution for the organic fraction, converting waste into nutrient-rich humus for soil enrichment.
Final Solution: Municipal Solid Waste is a complex mixture of organic and inorganic debris produced by human settlements; it requires systematic management via the waste hierarchy—avoidance, recovery, and scientific disposal—to mitigate the risks of groundwater pollution, vector-borne disease transmission, and long-term environmental degradation.
More Questions from Class 12 Biology Environmental Issues EXERCISES
- Q1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
- Q1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
- Q2: List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?
- Q2: List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?
- Q3: Discuss the causes and effects of global warming. What measures need to be taken to control global warming?
- Q3: Discuss the causes and effects of global warming. What measures need to be taken to control global warming?
- Q4: Match the items given in column A and B:
- Q4: Match the items given in column A and B: Column A Column B (a) Catalytic converter (i) Particulate matter (b) Electrostatic precipitator (ii) Carbon monoxide and nitrogen oxides (c) Earmuffs (iii) High noise level (d) Landfills (iv) Solid wastes
- Q5(a): Write critical notes on the following: (a) Eutrophication
- Q5(a): Write critical notes on the following: (a) Eutrophication
- Q5(b): Write critical notes on the following: (b) Biological magnification
- Q5(b): Write critical notes on the following: (b) Biological magnification
- Q5(c): Write critical notes on the following: (c) Groundwater depletion and ways for its replenishment
- Q5(c): Write critical notes on the following: (c) Groundwater depletion and ways for its replenishment
- Q6: Why does ozone hole form over Antarctica? How will enhanced ultraviolet radiation affect us?
- Q6: Why does ozone hole form over Antarctica? How will enhanced ultraviolet radiation affect us?
- Q7: Discuss the role of women and communities in protection and conservation of forests.
- Q7: Discuss the role of women and communities in protection and conservation of forests.
- Q8: What measures, as an individual, would you take to reduce environmental pollution?
- Q8: What measures, as an individual, would you take to reduce environmental pollution?
- Q9(a): Discuss briefly the following: (a) Radioactive wastes
- Q9(a): Discuss briefly the following: (a) Radioactive wastes
- Q9(b): Discuss briefly the following: (b) Defunct ships and e-wastes
- Q9(b): Discuss briefly the following: (b) Defunct ships and e-wastes
- Q9(c): Discuss briefly the following: (c) Municipal solid wastes
- Q10: What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
- Q10: What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
- Q11(a): Discuss briefly the following: (a) Greenhouse gases
- Q11(a): Discuss briefly the following: (a) Greenhouse gases
- Q11(b): Discuss briefly the following: (b) Catalytic converter
- Q11(b): Discuss briefly the following: (b) Catalytic converter
- Q11(c): Discuss briefly the following: (c) Ultraviolet B
- Q11(c): Discuss briefly the following: (c) Ultraviolet B
CBSE Solutions for Class 12 Biology Environmental Issues
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
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