By 2025, the world faces an escalating waste crisis. Global municipal solid waste (MSW) generation reached an estimated 2.1 billion tonnes in 2023 and is projected to climb to 3.8 billion tonnes by 2050.
Rapid urbanization and industrialization continue to push waste volumes upward, making efficient solid waste management more critical than ever.
In 2023, the world generated 2.1 billion tonnes of MSW. The direct cost of managing that waste was estimated at USD 252 billion in 2020; with hidden costs (including health, pollution, and climate change), the total reached USD 361 billion.
If no action is taken, the direct cost could approach USD 640 billion annually by 2050. Conversely, a circular economy approach could transform waste management into a net gain of USD 108.5 billion per year by 2050.
Solid waste management can be described as the collection, treatment, and disposal of waste generated.
A better understanding of waste and keeping abreast with the latest technologies allows us to manage waste efficiently by reusing, recycling, and upcycling solid waste.
Despite all the available technologies, there are several challenges faced in effective solid waste management, such as administration, social problems, and financial sustainability.
With the uncontrolled rise of industrialization and human population, the rate of waste generation has grown exponentially.
Over the past few decades, any material that served its purpose would be disposed of without a second thought and eventually end up at a municipal dumping site – unsegregated.
This lack of segregation and appropriate disposal/treatment has led us to one of the greatest crises we face today.
So, how do we tackle the Goliath that is solid waste management today?
Currently, many countries seek innovative solid waste management strategies that are low-cost, easy to implement, decentralized, effective, and can be implemented with ease in the existing situation.
Not just this, all solid waste management strategies must be able to cope with and accommodate the possibility that waste generation may still keep increasing in the future.
With rapid urbanization and outdated solid waste management strategies, the country is facing a significant challenge in solid waste management.
In 2024, India’s population stands at 1.417 billion, with over 600 million urban residents projected by year-end. Urban India currently generates 55.6 million tonnes (MMT) of MSW annually, up from 62 MMT in 2020.
Collection efficiency is now at 70% nationwide, but treatment and disposal remain major challenges.
Out of 55.6 MMT generated, roughly 39 MMT is collected (70%). Of that, just 17 MMT is properly processed (composting, recycling, waste-to-energy), while the rest ends up in landfills or open dumps.
The honourable Prime Minister’s ‘Swachh Bharat Abhiyan’ aims to drive the country’s citizens, municipalities, and industries towards being more environmentally responsible and encouraging them to move towards sustainable waste management.
Solid Waste Management (SWM) today is an intrinsic component of keeping our cities, towns, and villages clean.
However, the biggest obstacle in this system is the lack of discipline in waste segregation, the most critical component in ensuring the rapid conversion of landfill garbage into composted material.
Poor waste segregation has led to rapid saturation of landfilling sites, along with a plethora of related issues.
Improper solid waste management is known to have a plethora of environmental impacts, but apart from that, it also has health and financial impacts.
The usual practice of waste disposal at landfill sites is unloading waste and piling it up till there is no further space available.
We have come to understand how inefficient solid waste management can impact our health and environment, and incur financial losses.
It becomes necessary to operate the allocated landfill site efficiently to minimize health risks, make the process cost-effective, and increase the capacity of the landfill and resource recovery at a much higher rate.
Decentralized segregation and disposal of waste come first and foremost when one thinks of any solid waste strategy.
The biggest hindrance in societies today is the lack of willingness to do something so simple and straightforward.
If every person could efficiently segregate and reuse, upcycle, recycle, and reduce their own waste, it would only be a matter of time before our waste management woes would be halved!
Currently, municipal bodies in India have begun enforcing compulsory segregation of waste and have encouraged people to handle their own biodegradable waste.
Landfills are the most basic solid waste management strategy that has been used for the past few decades.
However, poor and ignorant implementation of this strategy has had disastrous consequences for most countries.
The reasons for failure range from inappropriate allocation of land to an exponential increase in garbage dumped every day.
Modern sanitary landfills in 2024 increasingly incorporate leachate recirculation, methane extraction systems (capped at 75% methane capture efficiency), and engineered liners.
The average lifespan design for new landfill cells in metro areas (e.g., Bengaluru, Mumbai) is now 40–50 years based on current waste generation rates.
The greatest reason, however, is the non-segregation of waste.
Waste can basically be divided into two categories:
Various waste fractions are generated from different sources and activities.
These are primarily divided into organic and non-organic waste.
The entire premise of effective solid waste management is based on the effective segregation of waste.
The waste fraction that is biodegradable is known as organic, like food and kitchen waste, garden waste, market waste, food industries, wood processing, agricultural waste, etc., and the non-biodegradable waste is known as non-organic waste, like construction waste, health care waste, e-waste, plastic waste, metal waste, etc.
From the perspective of global solid waste management, it is evident that countries with high per capita incomes tend to generate more waste, while developing countries tend to generate less waste.
Hence, it is clear that urbanization, lifestyle, and high income levels have some influence on the quantity of waste generated.
The treatment process for the waste fraction depends on the type of waste.
In many countries, organic waste generation can account for as little as 50% of municipal waste generation, or as high as 80% in developing countries.
The load of organic waste, moisture content, and density of waste are higher in countries with low per capita incomes compared to those with high per capita incomes, whereas the consumption of paper, plastic, and packaging waste is significantly higher in high-income countries.
Municipal waste is a mixture of organic and non-organic waste.
The source of the waste also varies, including residential waste, industrial waste, commercial waste, construction and demolition waste, agricultural waste, and biomedical waste.
Waste from food preparations, vegetables, flowers, dry leaves, grass clippings, tree branches, animal waste, fish waste, and agricultural waste.
Duration for waste degradation also varies according to the composition of the waste.
The three factors that govern the success of a sanitary landfill are its Location, construction, and land distribution.
It is estimated that approximately 7 to 10 billion tons of waste are generated worldwide each year.
The rate of resource consumption is directly proportional to waste generation.
The three steps towards efficient solid waste management are reduce, reuse, and recycle.
Firstly, reduce the production of waste wherever possible.
Reuse whatever can be used again, and recycle the non-reusable waste into valuable products.
An efficient solid waste management strategy can be described as one where the maximum treatment of biodegradable waste is carried out in conjunction with the recycling and upcycling of generated non-biodegradable waste.
The second important step towards better solid waste management is Reuse.
Over the past few decades, significant advancements have been made in packaging technologies.
The greatest negative, however, has been that most of this packaging has not been made with 58/intent of reuse or recycling.
Today, a global solid waste management crisis looms over our heads.
Companies are investing in rethinking their packaging such that it can be reused or recycled.
Another nifty trick that can come in handy is learning to upcycle waste.
Upcycling is the process of creating something new from an object that has ceased to be of use or value in its current form.
Not only will this reduce the burden on landfills, but it will also alleviate the pressure on recycling facilities.
To learn more about managing and finding solutions for non-biodegradable waste, check out our in-depth guide on Non-Biodegradable Waste Management and Solutions.
Organic solid waste management technologies require immediate addressing, as tackling this fraction of waste can help reduce the burden on municipal solid waste management bodies.
Some well-known technologies for biodegradable solid waste management are:
There are various pros and cons to each solid waste management methodology, ranging from the type and quantity of waste that can be treated to the energy and time required.
Read on to find out more about the various options available.
Biological treatment in solid waste management entails the use of living organisms to degrade organic biodegradable waste.
The various methods are:
Composting technology is a process in which organic waste is decomposed by microorganisms under controlled conditions to produce a nutrient-rich product known as compost.
This compost can be used as an excellent soil amendment, improving the quality of topsoil used for gardening and farming.
Composting helps in creating a valuable product from waste, reduces the volume of garbage directed towards municipal landfills, reduces the risk of vector-borne epidemics, helps conserve natural resources, and is one of the most valuable solid waste management strategies that shows a lot of flexibility in implementation.
Composting is one of the few solid waste management strategies that can be implemented at the individual, community, and city levels.
Different composting processes can be implemented as part of a city’s solid waste management strategies, carried out based on the type and volume of waste.
Since the initiation of mandatory composting as a solid waste management strategy in cities and towns, people have employed the following technologies :
The advantages and disadvantages of these methods are described below:
Traditional pits are probably the first known methods of composting carried out as part of solid waste management.
The greatest advantage of the method is that it requires no infrastructure and minimal expenditure.
However, they do require a lot of space and run the disadvantage of taking up to 2-3 weeks for decomposition.
With the average housing society producing up to 100 kgs of waste every day and having no spare space to accommodate a composting pit, using this technique as a solid waste management strategy in a city is just not practical.
It may be feasible in rural localities where space is not a constraint.
A few additional disadvantages include malodor formation, the creation of toxic leachate, and increased pest infestations, which are other issues often encountered during this process.
Aerating these pits needs frequent manual intervention, which is an extremely cumbersome process.
Incomplete degradation due to ineffective indigenous microbes is also a frequently encountered issue.
For a large volume of organic waste, the windrow process is preferred, where the waste is stacked in the form of rows of elongated piles.
The pile dimensions are usually maintained at 4 to 6 feet in height and a width of 14 to 16 feet.
Aeration is provided through vented pipes.
It can be used for municipal solid waste management at a rural level and for composting agricultural residue.
The greatest advantage of this technique is that it does not require elaborate infrastructural inputs.
Handling difficulties remains the same as those faced in composting pits.
This method involves composting a small volume of waste at the source itself, typically at the household or housing society level.
Waste collection and composting occur in a perforated bin, allowing for aeration.
The number and size of these bins can be increased depending on the quantity of waste.
They may need to be turned manually or come equipped with a motor to overturn the waste when necessary.
With proper moisture maintenance and aeration, bin composting is a relatively cost-effective and user-friendly method of community-level biological solid waste management.
Explore our DIY guide to creating nutrient-rich compost right at home!
This method involves the composting of waste material inside a vessel under controlled conditions.
There is better provision for mixing, airflow, and temperature control, which helps in accelerating the composting process in this method.
This method is usually used for solid waste management at a community level.
Thermocomposting machines offer the advantages of complete physical containment as compared to pots and pits.
They rapidly reduce the moisture content in the organic waste, thereby addressing the odour while promoting aerobic decomposition.
If locally made, the cost of employing this technology is substantially reduced.
Disadvantages: Relatively expensive.
The resulting compost from these machines tends to be of suboptimal quality, so a curing technique (lasting close to a week) needs to be employed, which increases the processing time by approximately a week.
They are more prone to breakdown due to the use of cheaper raw materials.
They, therefore, require frequent servicing, ultimately increasing the input cost.
The most common hurdles encountered in the composting process employed as a solid waste management strategy are:
Vermicomposting is carried out using a combination of earthworms and microorganisms to degrade organic waste under controlled conditions.
This method is typically used for the management of biological solid waste, including agro-waste.
Earthworms, being higher life forms, have the heightened capability of digesting complex lignocellulosic matter.
The feces of earthworms have this organic matter broken down into much simpler forms, making it easy for microbes to further break down into compost.
The end product obtained is high-quality vermicompost.
The drawback of vermicompost is that it requires close monitoring of environmental conditions and food material.
The excessive worms obtained from this process can be used as nutritious feed for fish.
Vermicompost still remains one of the most efficient solid waste management techniques in gardening and agricultural management today.
The term “anaerobic digestion” itself explains that microbial degradation of biodegradable waste occurs in the absence of oxygen.
The system is also known as biogas formation or bio-methanation, as anaerobic digestion produces gases such as methane and carbon dioxide as its end products.
Methane is a combustible gas that is valuable as it can be used as a renewable source of energy.
Anaerobic digestion is one of the most important methods of solid waste management strategies because it is a solution to the ongoing global energy crisis.
A major setback of anaerobic digestion is the major investment in infrastructure and the complexity of the process.
Thermochemical conversion is the process of converting lignocellulosic waste material into an energy source by subjecting it to heat treatment.
The advantage of this solid waste management technique is its substrate non-specificity.
The disadvantage is relatively high investments in infrastructure and energy expenditure.
The most common methods for thermochemical treatment are:
Recycling is the process of converting waste into objects of renewed value, preventing the waste of materials and reducing the wasteful consumption of virgin raw materials, energy, and pollution by decreasing the need for the disposal of non-degradable waste.
Recycling is intrinsic to waste reduction today. It has numerous economic and environmental benefits.
In conclusion, A sustainable solid waste management strategy would require participation from every section of society.
Policies and legislation developed by the government should be informed by the environmental, financial, and social implications.
Collaborative partnerships with private companies and assigning them specific roles can enhance the system’s functionality.
Additionally, the role of citizens in this process has a significant impact on waste segregation and disposal, emphasizing the importance of reduction, reuse, and opting for more recycled waste whenever possible.
We have one planet, one choice, one chance.
