Disposal of waste: Solid and Gas

•    Solid waste is produced due to human activities and can be solid or semi-solid.
•    Solid waste can be biodegradable or non-biodegradable.
•    Separation of non-biodegradable waste from biodegradable waste is necessary before disposal.
•    Sanitary landfills, incineration, composting, vermiculture, biogas production, pelletising and pyrolysis are various methods of solid waste disposal.
•    Sanitary landfill is a process of dumping the solid waste in a low lying land area.
•    Bio-methanation, which occurs in the presence ofmethanogenic bacteria, is an economic biochemical process that produces a clean and efficient fuel (i.e. biogas), as well as manure.
•    Incineration is the process of burning of wastes in the presence of oxygen at high temperature under controlled conditions in furnace. It is a useful technology to deal with large quantities of organic wastes.
•    Composting refers to the natural biological process of decomposing the organic waste by microorganisms (bacteria) and converting it into manure under controlled conditions.
•    Vermi-composting is a biotechnological process of composting, in which certain species of earthworms are used for converting the organic waste into compost.
•    The process of formation of fuel pellets is called pelletisation.
•    Pyrolysis refers to the process of burning of waste under anaerobic (oxygen deficient) conditions at high temperature (650ºC to 1000ºC).The main purpose of pyrolysis is to produce gas.
•    Electrostatic precipitator and scrubber are mainly used for the removal of particulate from polluted gases.

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  • Q1

    Gas produced from biodegradable wastes is called

    Marks:1
    Answer:

    biogas.

    Explanation:

    Biogas is produced from the decomposition of biodegradable wastes. It is used for heating, lighting and cooking.

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  • Q2

    An example of e-waste

    Marks:1
    Answer:

    Computer

    Explanation:
    E- waste consists of discarded  electronic appliances like computers, TVs, transistors,  mobile phones etc. They contains harmful substances like lead, cadmium, mercury etc. and valuable substances like Gold, silver, copper etc.
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  • Q3

    The garbage collected from a city or town is dumped into

    Marks:1
    Answer:

    landfill.

    Explanation:

    Landfill is an area where the garbage collected from a city or town is dumped.

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  • Q4

    Plant, animal or kitchen waste is collected in

    Marks:1
    Answer:

    green colour dustbin.

    Explanation:

    Plant, animal or kitchen waste is collected in green colour dustbin.

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  • Q5

    We should not use the bags made of

    Marks:1
    Answer:

    plastic.

    Explanation:

    The plastic bags should not be used because eatables kept in these bags could be harmful to our health and plastics give out harmful gases on burning.

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