Describe any five modes of waste disposal?
Five modes of waste disposal are :
- Incineration - it includes burning of waste
- Sewage Treatment- it includes treating the waste material and then discarding it in rivers or using treated water for irrigation etc.
- Preparation of compost- Biodegradable waste can be converted in compost which can be then used as manure in the fields.
- Landfill - The waste material is dumped under the ground.
You can refer to the answer of your friend for details.
@ Shivangi : Good work. Keep posting!!
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- Incineration-Incineration is a waste treatment process that involves the combustion of organic substances contained in waste materials.  Incineration and other high temperature waste treatment systems are described as " thermal treatment ". Incineration of waste materials converts the waste into ash , flue gas , and heat. The ash is mostly formed by the inorganic constituents of the waste, and may take the form of solid lumps or particulates carried by the flue gas. The flue gases must be cleaned of gaseous and particulate pollutants before they are dispersed into the atmosphere . In some cases, the heat generated by incineration can be used to generate electric power .
- Sewage Treatement-Sewage treatment is the process of removing contaminants from wastewater and household sewage , both runoff ( effluents ), domestic, commercial and institutional. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally safe fluid waste stream (or treated effluent ) and a solid waste (or treated sludge ) suitable for disposal or reuse (usually as farm fertilizer ). Using advanced technology it is now possible to re-use sewage effluent for drinking water, although Singapore is the only country to implement such technology on a production scale in its production of NEWater.
- Preparation of Compost-Composting is the gardener’s way to use nature’s decay of organic ingredients. It isn’t hard to do and a pile of compost will yield a rich, dark substance that improves garden soil and nurtures plants. Composting also keeps household garbage and yard waste out of landfills. It is the perfect recycling activity to help you grow fruits, vegetables, flowers and shrubs. Basic backyard composting is an uncomplicated process.
- Landfill-A landfill site (also known as tip , dump , rubbish dump or dumping ground and historically as a midden ) is a site for the disposal of waste materials by burial and is the oldest form of waste treatment . Historically, landfills have been the most common methods of organized waste disposal and remain so in many places around the world. Some landfills are also used for waste management purposes, such as the temporary storage, consolidation and transfer, or processing of waste material (sorting, treatment, or recycling).
- Recycling-Recycling is a process using materials ( waste ) into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce air pollution (from incineration ) and water pollution (from landfilling ) by reducing the need for "conventional" waste disposal, and lower greenhouse gas emissions as compared to plastic production.   Recycling is a key component of modern waste reduction and is the third component of the " Reduce , Reuse , Recycle" waste hierarchy .