Meghan Hodges
Landfills are sites designed to store garbage and are one of the most common waste management methods used globally. Modern landfills are designed to minimize the effects of trash on human health and the environment. However, they still pose a severe threat to the health of residents, the environment, and the local economy. To minimize pollution from landfills, several measures can be taken, including recycling and composting to reduce waste, proper disposal and burying of waste, using liners and caps to reduce contaminated liquid seepage, and employing degassing methods to capture methane.
| Characteristics | Values |
|---|---|
| Controlled landfills | Waste is buried in an engineered manner, isolated from the groundwater, while mostly maintaining the waste in a dry form |
| Modern landfills | Encased in impermeable liners and caps to reduce contaminated liquid seeping from the landfill |
| Modern landfill monitoring | Water samples are drawn and analyzed to detect pollutants that escaped from the lined landfill |
| Leachate | Liquid that passes through the landfill and may draw out toxins from the trash |
| Methane | The major component of natural gas, which is highly flammable and can form explosive mixtures with air |
| Reducing landfill reliance | Recycling and composting reduce the amount of waste that has to be transported to landfills |
| Landfill gas prevention | Homeowners or developers can minimize entry points and ensure adequate ventilation |
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What You'll Learn
Reduce, reuse, recycle, and recover waste
Landfills are one of the most common waste management methods, but they come with significant environmental and health concerns. The release of methane gas, a highly potent greenhouse gas, is one of the most pressing issues associated with landfills. Along with methane, they also emit carbon dioxide, water vapour, and trace amounts of other gases, contributing to climate change and smog. Additionally, landfills destroy natural habitats, pollute groundwater and surface waters, and expose residents to toxic emissions.
To minimise pollution from landfills, it is essential to adopt the principles of "Reduce, Reuse, Recycle, and Recover".
Reduce: The most effective way to minimise landfill pollution is to reduce the amount of waste generated. This involves conscious purchasing decisions, such as buying only what is needed and choosing products with minimal packaging. Single-use plastics should be avoided, and reusable alternatives, like durable lunch boxes, containers, and shopping bags, should be favoured.
Reuse: Reusing items extends their useful life and reduces the need for new purchases. Instead of discarding unwanted items, consider repairing, donating, or selling them. Clothing, appliances, tools, and furniture are all examples of items that can be reused by others.
Recycle: Recycling keeps materials like plastic, paper, cardboard, aluminium, steel, glass, and motor oil out of landfills and puts them to further use. It is a cost-effective disposal option that saves natural resources and protects the environment. However, it is important to know what items your local recycling program collects and to separate waste appropriately.
Recover: Recovering waste involves transforming it in an environmentally safe manner. Composting, for instance, diverts biodegradable items from landfills and allows them to fully decompose, as landfills lack the necessary oxygen for this process. Additionally, modern landfills employ strategies to minimise the release of contaminated liquids (leachate) into groundwater and nearby waterways. These include liners, collection pipes, impermeable caps, and monitoring wells. While these measures reduce pollution, they do not eliminate it, and water must be prevented from coming into contact with buried waste for extended periods.
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Compost biodegradable items
Landfills are pits or mountains filled with waste and covered with earth. Modern landfills are encased in liners and caps to reduce the amount of contaminated liquid seeping out. However, these liners often leak, and landfills release methane, a greenhouse gas that contributes to climate change. Landfills also produce carbon dioxide, water vapour, and trace amounts of oxygen, nitrogen, hydrogen, and non-methane organic compounds. These gases can contribute to climate change and create smog if left uncontrolled.
To minimize pollution from landfills, many towns, cities, and countries are implementing measures to reduce, recycle, reuse, recover, and reduce waste. Recycling and composting play a significant role in minimizing landfill pollution. Composting is nature's way of recycling and is one of the most powerful actions we can take to reduce trash, address climate change, and build healthy soil.
Composting is the managed, aerobic (oxygen-required) biological decomposition of organic materials by microorganisms. Compostable materials include food scraps, grass clippings, leaves, yard and tree trimmings, and biodegradable items.
- Identify certified "home compostable" materials: If you have a home compost pile, only put in items that are certified as home compostable. Check for clear labelling on the items.
- Understand the difference between biodegradable and compostable: Biodegradable plastic is defined by its ability to break down into natural substances within a reasonable time frame. In contrast, compostable plastic is designed and tested for processing in home or industrial composting facilities under specific conditions like temperature and moisture.
- Check local recycling guidelines: Compostable and biodegradable plastic can contaminate the recycling stream, so refer to local guidelines to ensure proper disposal.
- Maintain your compost pile: A well-maintained compost pile can be ready for use in three to five months. It should look dark, loose, and crumbly and smell like fresh soil. Screen or sift your compost to filter out any remaining materials, such as twigs, fruit pits, or eggshells.
- Use compost to build healthy soil: Applying compost to the soil reduces the need for chemical fertilizers, improves plant growth, prevents soil erosion, and helps conserve water.
By composting biodegradable items instead of sending them to landfills, you can help minimize pollution, reduce waste, and contribute to a healthier environment.
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Use landfill liners and caps
Landfills are a common waste management method used in all countries, irrespective of their developmental status. They are designed and built into or on top of the ground, isolating waste from the surrounding environment. Modern landfills are encased in impermeable liners and caps to reduce the amount of contaminated liquid seeping from the landfill.
Liners and caps work together to control leachate, which is a toxic brew of garbage coffee that leaks out of the landfill and seeps into groundwater, contaminating wells and water bodies. The impermeable liner prevents groundwater from rising up and mixing into the trash layers, while also controlling where leachate gathers and goes. Liners are essential for controlling the leachate that is produced during the active filling of a landfill, so the soil and groundwater remain unaffected.
The production of leachate cannot be avoided, but it can be managed. Pipe collection systems in newer landfills help to collect leachate for treatment. The leachate is pumped or drained out from between the layers of the liner to dispose of it safely elsewhere. Most landfill cells involve multiple layers of different liners separated by gravel and geotextile mats. The first few layers are somewhat permeable to allow leachate and other liquids to accumulate above the final impermeable liner.
Capping a landfill cell is also essential for controlling the total volume of leachate. Without capping, rainwater continues to flow into the cell and adds to the total amount of leachate. Once the individual landfill cell has been filled and compacted, it is time to add the cap material. Like liners, most cell caps are more than just a single layer of material. Caps generally contain a combination of impermeable cover materials, thick layers of soil and vegetation, or an artificial alternative.
While these measures can reduce and delay leachate releases, they cannot prevent eventual water pollution. This is because water must be prevented from coming into contact with the buried waste for hundreds, even thousands of years. Liners have been in use for about 30 years, which is about the same duration as the warranty offered by most liner manufacturers. In the United States, landfill owners are only required to monitor and maintain the landfill for 30 years.
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Monitor and maintain landfills
Landfills are necessary for the proper disposal of solid waste. They help prevent disease transmission and keep communities clean. However, they also have significant environmental and social impacts. Modern landfills are well-engineered and managed facilities for waste disposal, and they are monitored to ensure compliance with federal regulations.
Modern landfills are designed to minimize the effects of trash on human health and the environment. They are completely sealed to reduce contamination of the nearby groundwater. The ground is lined with clay and a thin layer of flexible plastic is placed on top to collect leachate—a liquid that passes through the landfill and draws out toxins from the trash. The collected leachate is then treated to remove toxins.
To minimize pollution from landfills, it is crucial to implement effective monitoring and maintenance practices. Here are some key measures to achieve this:
- Groundwater Monitoring: Nearly all Municipal Solid Waste Landfills (MSWLFs) are required to monitor the underlying groundwater for contamination during their active life and post-closure care periods. This helps ensure that waste is not escaping and polluting the surrounding environment.
- Leachate Management: The flexible plastic liner beneath and around the sides of the buried waste helps collect leachate. Additionally, a system of pipes at the bottom of the landfill aids in collecting leachate for treatment.
- Final Cover System: Once a landfill cell is closed, it is covered with an impermeable cap to minimize infiltration of liquids and soil erosion. This helps prevent the "bathtub effect," where liquids infiltrate the overlying cover system but are contained by a more permeable underlying liner system.
- Monitoring Wells: Landfills are ringed with monitoring wells to detect significant increases in the release of leachate. While these measures can reduce and delay leachate releases, they may not prevent eventual water pollution.
- Post-Closure Care: Owner/operators of MSWLFs are required to continue monitoring and maintaining the landfill even after it is closed. This includes preparing a written post-closure care plan that outlines all required monitoring and maintenance activities and their frequencies. The required post-closure care period is typically 30 years from site closure, ensuring the protection of human health and the environment.
- Financial Assurance: Owners/operators of MSWLFs must demonstrate their financial capability to cover the costs of closure, post-closure care, and any corrective actions necessary due to releases of contaminants. This financial assurance ensures proper long-term planning for the closure and maintenance of landfills.
- On-Site Environmental Monitoring: Landfills are equipped with on-site environmental monitoring systems that check for any signs of groundwater contamination and landfill gas. These monitoring systems provide additional safeguards to protect the environment from contaminants that may be present in the waste stream.
By implementing these monitoring and maintenance measures, landfills can be better managed to minimize pollution and protect human health and the surrounding environment.
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Site landfills away from inhabited areas
Landfills are necessary for the proper disposal of solid waste. They help to prevent disease transmission and keep communities clean. However, they have significant environmental and social impacts. The most pressing environmental concern regarding landfills is their release of methane gas. As organic waste decomposes in landfills, methane gas is released. Methane is 84 times more effective at absorbing heat than carbon dioxide, making it one of the most potent greenhouse gases and a huge contributor to climate change.
To minimize pollution from landfills, it is important to site them away from inhabited areas. This is a legal requirement in many places. Landfills should not be built in environmentally sensitive areas, and on-site environmental monitoring systems are used to check for any signs of groundwater contamination and landfill gas.
The negative impacts of landfills on nearby populations include exposure to hazardous emissions, which pose a threat to human health. A study in New York found a 12% increased risk of congenital malformations in children born to families living within a mile of a hazardous waste landfill site. Landfills also create noise and odour pollution, and their presence tends to decrease surrounding property values.
To minimize these impacts, landfills should be located away from residential areas, with buffer zones in place to protect nearby communities. This approach helps to reduce the potential exposure of residents to harmful emissions and other negative consequences of landfill sites.
In addition to the distance from inhabited areas, modern landfills employ various measures to minimize pollution. These include the use of liners and caps to reduce the leakage of contaminated liquids, as well as extraction pipes to trap and transport methane gas for treatment or electricity generation. Regular monitoring and testing of soil and groundwater are also crucial to detect and address any contamination issues.
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Frequently asked questions
Landfills pose a number of dangers to the environment and human health. They release methane gas, a potent greenhouse gas that contributes to climate change. They also produce carbon dioxide, water vapour, and trace amounts of oxygen, nitrogen, hydrogen, and non-methane organic compounds, which can create smog. Additionally, landfills can contaminate soil and water sources, and destroy natural habitats for wildlife.
Leachate is the liquid that passes through a landfill and draws out toxins from the trash. It can contain high levels of ammonia, mercury, and other hazardous materials. When ammonia enters ecosystems, it can cause eutrophication, or a lack of oxygen, in nearby water sources, creating "dead zones" where animals cannot survive.
Landfill gases, including methane, carbon dioxide, ammonia, and hydrogen sulfide, can move through soil and collect in nearby buildings, especially in areas with poor ventilation such as basements and crawl spaces. These gases can cause respiratory problems and other health issues for people living close to landfills.
Modern landfills use a series of measures to minimize leachate release, including liners beneath and around the buried waste, a system of pipes to collect leachate for treatment, and impermeable caps to cover the landfill once it is closed. Monitoring wells are also used to detect increases in leachate release.
Pollution from landfills can be reduced by minimizing waste and increasing recycling, reuse, and composting. Additionally, proper disposal methods such as burying waste in engineered landfills isolated from groundwater can help minimize environmental impacts. Regular monitoring and testing of closed landfills can also help identify and mitigate any potential issues.
