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Which of the following statements about sanitary landfilling is INCORRECT?
Waste is stabilised by the aerobic process alone.
In the sanitary landfilling, filling of refuse is actually carried out by dividing the entire landfill area into smaller portions called cells.
Refuse is dumped into a low-lying area.
Another name of sanitary landfilling is controlled tipping.
Waste is stabilised by the aerobic process alone.
A sanitary landfill is an engineered facility for the disposal of municipal solid waste, where waste is stabilized through both aerobic and anaerobic biological degradation processes. Option A is incorrect because the process is not limited to aerobic degradation; in fact, the deep layers of a landfill quickly become anaerobic due to oxygen depletion.
CPHEEO Manual on Municipal Solid Waste Management
A sanitary landfill is an engineered facility for the disposal of municipal solid waste, where waste is stabilized through both aerobic and anaerobic biological degradation processes. Option A is incorrect because the process is not limited to aerobic degradation; in fact, the deep layers of a landfill quickly become anaerobic due to oxygen depletion.
CH4тАЛ+2O2тАЛтЖТCO2тАЛ+2H2тАЛO тАФ Aerobic decomposition
C6тАЛH12тАЛO6тАЛтЖТ3CH4тАЛ+3CO2тАЛ тАФ Methanogenesis (Anaerobic)
The landfill utilizes a 'cell' construction method where waste is spread and compacted in thin layers. Decomposition occurs initially under aerobic conditions, but as the waste is buried and covered, anaerobic bacteria take over to break down organic matter, producing landfill gases like methane (CH4тАЛ) and carbon dioxide (CO2тАЛ).
Sanitary landfilling involves systematic placement, compaction, and daily covering of waste.
Leachate collection and gas management systems are mandatory in modern sanitary landfills.
The process involves complex microbial activities transitioning from aerobic to anaerobic phases.
Controlled tipping is a synonym for the sanitary landfilling process.
Cost-effective for large volumes of waste
Can reclaim low-lying land for future public use
Risk of groundwater contamination if liner fails
Generation of significant landfill gas (methane emission)
Requires large land area
Disposal of non-hazardous municipal solid waste
Land reclamation projects
Option B is correct as the cell method allows for systematic filling and reduces odor/pest issues.
Option C is correct as landfills are often sited in depressed topography to minimize excavation.
Option D is correct as 'controlled tipping' is an early technical term for sanitary landfilling.
A is correct тАФ The decomposition in a sanitary landfill involves both aerobic and anaerobic phases, not aerobic alone.
In environmental engineering MCQs, always look for the word 'alone' or 'only' as these often indicate incorrect statements due to the complex, multi-stage nature of biological processes.
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