BIOLOGY IN HUMAN WELFARE
HUMAN HEALTH AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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pipes to extract methane gas
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plastic or clay liner
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a layer of gravel between the MSW and soil
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the soil cap that covers the landfill after it reaches capacity
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Detailed explanation-1: -Modern landfills are constructed with an impervious liner covering the bottom, which is often made of multiple layers of thick plastic and sand. Through leaching or percolation, this liner guards against contamination of the groundwater.
Detailed explanation-2: -A sanitary landfill protects community health when: it is built away from where people live. it is covered to prevent insects and other disease-carrying animals from breeding. it has a lining of hard-packed clay soil or plastic to prevent chemicals and germs from contaminating groundwater.
Detailed explanation-3: -Geotextiles: In landfill liners, geotextiles are used to prevent the movement of small soil and refuse particles into the leachate collection layers and to protect geomembranes from punctures. These materials allow the movement of water but trap particles to reduce clogging in the leachate collection system.
Detailed explanation-4: -Leachate can be treated by biological processes, such as activated sludge. Physicochemical processes are used to remove metals, ammonia, and dissolved solids, among other parameters. Membrane separation is an effective method for clarifying mixed liquor produced during biological treatment.