Solid Wastes Questions in English

(B) Household waste primarily consists of organic materials such as food scraps,vegetable peels,and paper,which can be broken down by microorganisms. Therefore,it is classified as biodegradable pollution.

(C) Polyblend is a fine powder of recycled modified plastic.
It was developed by Ahmed Khan of Bangalore.
When mixed with bitumen,it enhances the water-repellent properties of the bitumen and helps in the construction of roads with increased life span and resistance to water damage.
Therefore,it has proved to be a good material for the construction of roads.

(C) Polyblend is a fine powder of recycled modified plastic.
It was developed by Ahmed Khan,a plastic sack manufacturer in Bangalore.
When mixed with bitumen (dammar),it is used to lay roads.
This mixture enhances the water-repellent properties of bitumen and helps in the disposal of plastic waste,making it an innovative remedy.

(N/A) Radioactive wastes: Radioactive wastes are generated during the process of generating nuclear energy from radioactive materials. Nuclear waste is rich in radioactive materials that generate large quantities of ionizing radiations such as gamma rays. These rays cause mutation in organisms,which often results in skin cancer. At high dosage,these rays can be lethal.
Safe disposal of radioactive wastes is a big challenge. It is recommended that nuclear wastes should be stored after pre-treatment in suitable shielded containers,which should then be buried in rocks.
$(b)$ Defunct ships and $e-$ wastes: Defunct ships are dead ships that are no longer in use. Such ships are broken down for scrap metal in countries such as India and Pakistan. These ships are a source of various toxicants such as asbestos,lead,mercury etc. Thus,they contribute to solid wastes that are hazardous to health.
$E-$ wastes or electronic wastes generally include electronic goods such as computers etc. Such wastes are rich in metals such as copper,iron,silicon,gold etc. These metals are highly toxic and pose serious health hazards. People of developing countries are involved in the recycling process of these metals and therefore,get exposed to toxic substances present in these wastes.
$(c)$ Municipal solid wastes: Municipal solid wastes are generated from schools,offices,homes,and stores. It is generally rich in glass,metal,paper waste,food,rubber,leather,and textiles. The open dumps of municipal wastes serve as a breeding ground for flies,mosquitoes,and other disease-causing microbes. Hence,it is necessary to dispose municipal solid waste properly to prevent the spreading of diseases. Sanitary landfills and incineration are the methods for the safe disposal of solid wastes.

(N/A) Solid waste includes everything that goes out in trash. Municipal solid waste consists of wastes from homes,offices,stores,schools,hospitals,etc.,that are collected and disposed of by the municipality. It generally comprises paper,food wastes,plastics,glass,metals,rubber,leather,cloth,etc. Burning reduces the volume of the wastes,but it is not usually burnt to completion and open dumps often serve as the breeding ground for rats and flies.
Sanitary landfills were adopted as a substitute for open-burning dumps. In these landfills,wastes are dumped in a depression or trench after compaction and covered with dirt every day.
However,in cities,the amount of municipal waste generated is so high that this method is failing. Also,there is a danger of seepage of chemicals,etc.,from these landfills polluting the underground water resources.

(A) Waste materials are primarily classified into three categories:
$1$. Biodegradable: Waste that can be broken down by microorganisms (e.g.,food waste,plant remains).
$2$. Non-biodegradable: Waste that cannot be decomposed by biological processes (e.g.,plastics,glass,metals).
$3$. Recyclable: Materials that can be processed to create new products (e.g.,paper,certain plastics).
Methods to manage and get rid of waste include:
- Composting: Converting biodegradable waste into organic manure.
- Recycling: Processing waste materials into new useful products.
- Landfills: Dumping non-biodegradable waste in designated low-lying areas.
- Incineration: Burning waste at high temperatures to reduce volume,often used for hospital waste.
- Reduction and Reuse: Minimizing waste generation at the source.

(A) Electronic waste ($e$-waste) refers to irreparable computers and other discarded electronic goods.
These wastes are often buried in landfills or exported to developing countries like China,India,and Pakistan for recycling.
During the recycling process,valuable metals such as copper,iron,silicon,nickel,and gold are recovered.
However,in developing countries,manual recycling processes often expose workers to toxic substances present in $e$-waste.
To manage plastic waste,Ahmed Khan,a plastic sack manufacturer,developed 'Polyblend',a fine powder of recycled modified plastic.
When mixed with bitumen and used for road construction,Polyblend enhances the water-repellent properties of bitumen and increases the road's lifespan by a factor of three.

(N/A) The experiment on the use of plastic waste for road construction was pioneered by Ahmed Khan,a plastic sack manufacturer in Bengaluru.
$1$. He found that plastic waste,specifically polyblend (a fine powder of recycled modified plastic),could be mixed with bitumen (asphalt) to lay roads.
$2$. This mixture enhances the water-repellent properties of the bitumen,which significantly increases the road's life.
$3$. The process involves mixing the polyblend with bitumen at a specific temperature.
$4$. This method provides a sustainable solution for the disposal of plastic waste,as it prevents the accumulation of non-biodegradable plastic in landfills and reduces the need for raw bitumen.

(N/A) The use of plastic waste in road construction materials offers several significant advantages.
$1$. These roads exhibit much higher durability and strength compared to conventional roads.
$2$. They are highly resistant to the formation of potholes caused by rainwater.
$3$. They show reduced bleeding or softening during hot summer temperatures.
$4$. Mixing plastic waste with bitumen reduces the overall quantity of bitumen required,thereby lowering the construction cost and promoting the recycling of waste plastics.

(N/A) Waste generated at home: Paper,clothes,plastic,tin cans,cardboard boxes,crockery,thermocol.
Waste generated at school: Paper,chalk,envelopes,polythene.
Waste generated during travel: Disposable cups,glasses,spoons,leftover/discarded food,polythene.
Waste that can be easily reduced: This includes biodegradable waste,which is naturally decomposed by microorganisms. It consists of all organic materials,e.g.,leftover food,paper,wood,rags,etc.
Waste that is difficult or impossible to reduce: Broken glass,metal tin cans,plastics,and polythene cannot be decomposed by microorganisms; these are called non-biodegradable components.

(N/A) Radioactive waste: This is waste generated by nuclear power plants that emits radiation. The nuclei of these elements release $\alpha$-particles,$\beta$-particles,and $\gamma$-rays. Based on the level of radioactivity,it is classified into low-level,intermediate-level,and high-level waste. High-level radioactive waste is extremely destructive and can result from accidental leakage in atomic reactors. These radiations cause tumors,cancer,and genetic mutations. High-level waste requires special protective shielding,storage,and cooling during transport.
$(b)$ Defunct ships and e-waste: Old,non-functional ships are dismantled in developing countries like India,Pakistan,and Bangladesh due to cheap labor and the demand for scrap metal. These ships contain numerous toxic substances such as asbestos,lead,mercury,tributyltin,and polychlorinated biphenyls. Workers involved in dismantling these ships are exposed to these toxic substances. Coastal areas where ship-breaking activities occur also become polluted. $E$-waste includes irreparable computers and other electronic goods imported into developing countries for recycling to extract metals.
$(c)$ Municipal solid waste: This is waste generated from homes,offices,stores,hospitals,and small-scale industries in residential areas. It includes items such as clothes,broken glass,bottles,polythene bags,leather,metals,and electronic goods.

(C) The best solution for the treatment of electronic wastes ($e$-wastes) is recycling.
$e$-wastes contain valuable metals like copper,iron,silicon,nickel,and gold,which can be recovered through recycling processes.
This approach not only reduces the volume of waste sent to landfills but also minimizes the environmental pollution caused by toxic heavy metals present in electronic components.

(N/A) Electronic waste,or $e$-waste,consists of discarded,unusable electronic gadgets such as computers,mobile phones,circuits,and television sets.
Sources of $e$-waste include obsolete electronic equipment from households,offices,and industries,ranging from small devices like smartphones to large appliances.
These devices contain hazardous chemicals such as lead,cadmium,beryllium,mercury,and brominated flame retardants.
Improper disposal leads to severe environmental and health issues:
$1$. Soil and Water Contamination: When $e$-waste is dumped in landfills,rainwater can leach toxic heavy metals into the soil and groundwater,a process known as leachate formation.
$2$. Air Pollution: Burning $e$-waste releases toxic fumes and particulate matter into the atmosphere.
$3$. Health Risks: Exposure to these toxins can cause serious health problems,including kidney disease,brain damage,and genetic mutations.

(N/A) The basic characteristics of a modern landfill site include:
$1$. Lining with clay or plastic liners: These are used to contain leachate,preventing it from contaminating groundwater.
$2$. Compaction and covering of waste: Waste is compacted and covered daily with soil or other materials to prevent it from being blown by wind,reduce odors,and discourage pests.
$3$. Landfill gas extraction system: These systems are installed to collect gases like methane,which are then used for power generation or heating,reducing greenhouse gas emissions.

(N/A) Municipal solid wastes are wastes from homes,offices,stores,schools,hospitals,etc.
These are collected and disposed of by the municipality.
- They consist of paper,food wastes,plastics,glass,metals,rubber,leather,textiles,etc.
Burning reduces the volume of the wastes,but the waste is generally not burnt to completion,and open dumps often serve as breeding grounds for rats and flies.
Sanitary landfills were used as a substitute for open burning dumps,where wastes are dumped in a depression or trench after compaction and covered with dirt every day.
There is a danger of seepage of chemicals from these landfills,which can pollute underground water resources.

(N/A) Waste generated by human activities is generally classified into $3$ main types:
$(a)$ Biodegradable waste: These are organic materials that can be broken down by microorganisms into simpler substances. They can be disposed of in deep pits in the ground for natural decomposition.
$(b)$ Recyclable waste: These are materials like paper,glass,and certain metals that can be processed and reused. Rag-pickers and waste collectors play a crucial role in separating these materials for recycling.
$(c)$ Non-biodegradable waste: These include materials like plastics,synthetic fibers,and certain chemicals that cannot be decomposed by biological processes. They persist in the environment for a long time.
Additionally,hospitals generate hazardous waste containing disinfectants,harmful chemicals,and pathogenic microorganisms. Such waste requires careful treatment and specialized disposal methods,such as the use of incinerators.

(D) Open dumping of solid waste is hazardous to the environment as it leads to pollution and the spread of diseases.
Sanitary landfills were adopted as a substitute for open burning and dumping.
In a sanitary landfill,wastes are dumped in a depression or trench after compaction and covered with dirt every day.
This method prevents the breeding of pests and reduces environmental contamination.

(B) Waste materials produced by human activities are generally classified into $3$ main categories based on their nature and management:
$1$. Biodegradable waste: Waste that can be decomposed by microorganisms (e.g.,food waste,plant matter).
$2$. Recyclable waste: Waste that can be processed and reused (e.g.,plastic,paper,metal).
$3$. Non-biodegradable/Hazardous waste: Waste that cannot be easily decomposed and may pose environmental risks (e.g.,toxic chemicals,batteries,electronic waste).

(C) An incinerator is a furnace used for burning waste materials at very high temperatures. It is primarily used for the disposal of hospital waste (biomedical waste) because it effectively destroys pathogens,infectious agents,and hazardous materials that could otherwise spread diseases. Household,school,and office wastes are generally managed through recycling,composting,or landfilling.

(D) $E$-waste refers to electronic waste,which includes discarded electronic devices such as computers,mobile phones,televisions,and other electronic appliances that are no longer in use or are irreparable.
These items often contain toxic substances like lead,mercury,and cadmium,which pose significant environmental and health risks if not disposed of properly.
Therefore,irreparable computer components are classified as $E$-waste.

(D) $E$-waste (electronic waste) comprises discarded electronic devices such as computers,mobile phones,and televisions.
These devices contain valuable metals like $Copper$,$Gold$,$Iron$,$Silicon$,$Nickel$,and $Mercury$.
While metals are recovered through recycling processes,$Plastic$ is generally not recovered or recycled from $E$-waste in the same manner due to the complexity of the materials and the presence of hazardous flame retardants.
Therefore,among the given options,$Plastic$ is the correct answer.

(A) Polyblend is a fine powder of recycled modified plastic.
It was developed by Ahmed Khan of Bangalore.
When mixed with bitumen,it is used to lay roads,which enhances the water-repellent properties and increases the life of the road.

(A) Sanitary landfills were adopted as a substitute for open-burning dumps. In these systems,wastes are dumped in a depression or trench after compaction and then covered with dirt every day. This method helps in reducing the volume of waste,preventing the spread of diseases,and minimizing environmental pollution.

(B) Electronic waste $(e-waste)$ refers to discarded,surplus,obsolete,or broken electrical or electronic devices.
Environmental groups claim that the informal processing of $e-waste$ in developing countries causes serious health and pollution problems.

(C) Solid waste can be biodegradable,recyclable,or non-biodegradable.
Solid wastes are discarded solid materials produced due to various human activities. They are classified based on their nature and origin.
Solid wastes can be categorized as follows:
$(i)$ Municipal Solid Waste: Wastes from homes,offices,schools,hospitals,etc.
$(ii)$ Industrial Wastes: Wastes like scraps,fly ash,etc.,generated by industries.
$(iii)$ Hospital Wastes: Hazardous wastes containing disinfectants and other harmful chemicals generated by hospitals.
$(iv)$ Electronic Wastes ($e$-wastes): These are damaged electronic goods and irreparable computers.
Since solid waste encompasses a wide range of materials,it can be biodegradable (like organic kitchen waste) or non-biodegradable (like plastics and metals).

(C) Both scraps and fly ash are examples of industrial solid wastes.
Solid wastes are discarded solid materials produced due to various human activities. They can be biodegradable,recyclable,or non-biodegradable.
Solid wastes are categorized as follows:
$(i)$ Municipal Solid Waste: Wastes from homes,offices,schools,hospitals,etc.
$(ii)$ Industrial Wastes: Wastes like scraps,fly ash,etc.,generated by industries.
$(iii)$ Hospital Wastes: Hazardous wastes containing disinfectants and other harmful chemicals generated by hospitals.
$(iv)$ Electronic Wastes ($E$-wastes): These are damaged electronic goods and irreparable computers.

(A) Hospital wastes contain infectious materials,chemicals,and radioactive substances,making them highly hazardous. To prevent the spread of infections and environmental contamination,these wastes are treated and disposed of using an incinerator,which burns the waste at high temperatures to reduce it to ash.

(A) Incineration is the process of controlled aerobic combustion of waste materials in specialized chambers at high temperatures,typically ranging from $900^{\circ}C$ to $1300^{\circ}C$.
This process significantly reduces the volume of waste and destroys hazardous pathogens.
Pyrolysis,on the other hand,involves the thermal decomposition of organic material at elevated temperatures in the absence of oxygen (anaerobic conditions).

(C) Electronic wastes,or e-wastes,consist of irreparable computers and other electronic goods. These materials are primarily composed of non-biodegradable substances such as plastics,heavy metals,and glass. Therefore,the statement that the bulk of e-waste is biodegradable is incorrect.

(C) Electronic wastes,or e-wastes,consist of irreparable computers and other electronic goods. These are typically buried in landfills or incinerated. While recycling is the ideal method,it is often carried out in developing countries manually,exposing workers to toxic substances.

(N/A) Pyrolysis is the process of thermal decomposition of organic material at elevated temperatures in an inert atmosphere or in the absence of oxygen.
It requires a significant amount of energy to maintain the high temperatures necessary for the process.
Due to the high energy requirements and complex infrastructure,it is considered a very costly method for waste disposal.

(D) Solid waste refers to everything that goes out in trash. It includes municipal,industrial,and hospital wastes generated by human activities. Sanitary landfills are the sites where this waste is dumped,while electronic waste and radioactive waste are specific categories of solid waste.

(A) Municipal solid waste $(MSW)$ refers to the waste generated from everyday items that are discarded by the public. This includes waste from homes,offices,stores,schools,and hospitals. These materials are collected and disposed of by the municipal authorities. Therefore,the correct answer is $A$.

(B) Open burning and dumping of solid waste cause severe air and land pollution.
Sanitary landfills were adopted as a substitute for open-burning dumps.
In a sanitary landfill,wastes are dumped in a depression or trench after compaction and then covered with dirt every day.
This method helps in reducing the volume of waste and prevents the spread of diseases and foul odors.

(D) Sanitary landfills were adopted as a substitute for open burning dumps. In these systems,wastes are dumped in a depression or trench after compaction. The waste is then covered with dirt or soil on a daily basis to prevent the spread of disease and odors.

(B) Waste materials generated by human activities are generally classified into $3$ main categories based on their nature and degradation process:
$1$. Biodegradable waste: Waste that can be broken down by microorganisms (e.g.,food scraps,plant waste).
$2$. Recyclable waste: Waste that can be processed to create new products (e.g.,plastic,paper,glass,metals).
$3$. Non-biodegradable (or hazardous) waste: Waste that cannot be easily broken down and may pose health or environmental risks (e.g.,batteries,medical waste,certain chemicals).

(D) Hospitals generate hazardous waste that requires special handling and disposal methods.
This waste includes $A$ disinfectants used for sterilization,$B$ harmful chemicals used in laboratories or diagnostic procedures,and $C$ pathogenic microorganisms present in biological waste,used bandages,and surgical materials.
Therefore,all these components are considered hazardous waste generated by hospitals.

(D) Hospitals generate hazardous waste that contains pathogens and toxic materials.
To safely dispose of this waste,$Incinerators$ are used to burn the waste at high temperatures.
For certain types of hazardous waste,$Deep \ burial$ in pits that are $500 \ m$ deep and covered with stones is also an approved method to prevent environmental contamination.

(C) Electronic waste (e-waste) consists of irreparable computers and other electronic goods. These are often buried in landfills or incinerated. However,these methods are not environmentally friendly as they can release toxic substances into the soil and air. Therefore,the most appropriate method for e-waste disposal is recycling,but among the given options,both landfills and incineration are commonly cited as traditional disposal methods.