soild waste mangement: Disposal Method

 

Open Burning:

Waste burning is a major source of dangerous carcinogens, such as dioxins and furans, as well as black carbon, a short-lived climate pollutant that contributes to climate change, increased melting in polar regions due to soot and black carbon deposition on snow and ice, and a variety of human health issues.

Types of solid waste open burning

A: Residential open burning

Residential open burning happens mostly because of its convenience and poor collection, making it especially dangerous in low-income, developing nations that struggle to collect even 50% of the total MSW produced.

Domestic open burning is the indiscriminate burning of waste by individuals that is either never collected, or is collected and put away from dumpsites. This can happen right outside the house or in areas where waste is illegally dumped, such as roadside or other open public spaces.

This sort of open burning is uncontrolled, and no efforts are normally made to limit the health, and environmental consequences of the burning.

Other variables influencing residential open burning

The purpose of such waste management practices usually is to reduce the quantity of waste conveniently, and easily or in some cases to save money on collection. 

However, other factors can be involved. When waste (particularly organic waste) is not collected quickly enough, it can emit strong smells, which can be reduced by open burning.

B: Deliberate open burnings: Landfills and open Dumpsites

Waste in landfills and open dumpsites in underdeveloped countries, is frequently burned to minimize the quantity, which is often loaded above its capacity or has an unknown capacity due to the lack of planning involved, in the establishment of open dumps.

Open burning in landfills and open dumps is especially damaging to surrounding populations, because it occurs close to the ground rather than up high through stacks, where pollutants can be distributed more effectively to limit their health impacts.

C: Spontaneous Open Burnings: Landfills and Dumpsites

Fires can start spontaneously and unintentionally in enormous mounds of debris, in open dumps and landfills. The fires are most likely caused by a lack of waste treatment in these disposal places. 

The impacts of such fires are similar to those produced from, deliberate open burning of waste in landfills, and resemble intentional landfill fires for the most part. Similarly, unintentional dump fire airborne emissions, and ash leftovers might contain dangerous, concentrated contaminants.

Steps to reduce solid waste open burnings

The Waste Management equips to reduce open waste burning by:

·         Aiding in the development of integrated solid waste management systems, which improve waste collection and limit the presence of waste, in streets or informal dumpsites prone to open burning.

·         Waste separation efforts that bring informal waste pickers into the formal sector, are frequently included in integrated solid waste management systems.

·         Supporting enhanced landfill management, which has the potential to reduce the occurrence of spontaneous fires.

·         Conduct community outreach to increase waste prevention, and

·         To educate the public on the dangers of open waste burning.

 

Sea Dumping:

It is a well-known fact that water covers almost 70% of the globe in the form of various water bodies, such as oceans, lakes, and rivers, among others. All of these bodies of water, particularly the oceans and seas, are an essential element of our existence, since they play critical roles in our daily lives.

Careless human interference has harmed the oceanic ecology, compromising the survival of several different species, including humans. The biggest source of pollution in seas and bodies of water is solid waste disposal and dumping. Therefore, it becomes important to avoid disposing of solid waste into oceans or seas.

 

Pollution in Oceans

Dumping sewage or solid waste into the ocean has traditionally been seen, to be the cheapest and easiest way to dispose of waste. Every year, billions of tons of litter wind up in the water, bringing 250 million tons of waste into the sea.

 

Solid waste disposal in seas

The deliberate disposal of wastes or other matter from vessels, airplanes, platforms, or other man-made structures, into the sea is described as the solid waste disposal in sea.

The dumping of waste is at the top of the list of activities that contaminates the ocean. Therefore, dumping is the practice of depositing all waste items from factories and industries, tankers and ships, and sewerage waste materials, into oceans and seas.

 

Effects of dumping industrial waste into the oceans and seas

Some of the elements emitted by industrial waste, sewage and solid waste include mercury, DDT, plastics, micro plastics, etc. Some industrial waste contains radioactive elements. Even modest doses of these drugs have a detrimental impact.

The scope and volume of ocean dumping are not only large, but so massive that the intensity of irresponsible dumping might wipe out our entire civilisation.

 

Effects of dumping municipal waste into the oceans and seas

Beaches littered with plastic waste are not uncommon these days. Aside from a substantial portion of industrial waste, the dumping of plastic is another major source of pollution, as it gradually leads to negative consequences.

Plastic and other non-biodegradable materials will not be absorbed and recycled. When sea creatures and even birds unintentionally consume plastic, they choke on it, causing a slow drop in their population.

How can we avoid dumping solid waste into the sea?

The greatest solution is to prevent sea dumping from occurring, saving money on clean-up, preventing chemicals and pollutants from entering ground water, and preventing rodents and mosquitoes from breeding.

Here are some crucial elements to consider, in order avoiding illegal dumping of solid waste into the seas or oceans.

-  Educate the public on the costs, chemical hazards, and dangers of unlawful dumping, through schools and community awareness groups.

-  Make safe, public-friendly waste disposal solutions available and publicize them.

-  Make rules that inflict heavy fines on perpetrators, and publicize these stiff punishments.

-  Before disposing of waste, use innovative technology to recycle it.

-  Use social media to solicit public assistance in identifying the criminals.

-  Reduce your reliance on single-use plastics.

-  Take part in (or organize) a beach or river clean-up.

 

Sanitary Landfill:

sanitary landfill construction process involves selecting a suitable site, preparing the ground with a liner system to prevent leachate contamination, depositing waste in layers, compacting it, covering it with soil daily, and eventually capping the landfill once filled, all while carefully monitoring for potential environmental impacts and collecting leachate for treatment; essentially, it's a controlled method of disposing of solid waste by isolating it from the environment with layers of soil and a liner system to minimize pollution. 

Key Stages of Sanitary Landfill Construction:

·         Site Selection:

·         Identify a location with suitable soil conditions (low permeability), away from water sources, and with appropriate access for waste delivery and operations. 

·         Consider geological factors like rock formations and groundwater levels. 

·         Site Preparation:

·         Clear the land and level the surface. 

·         Install a perimeter drainage system to divert surface water away from the landfill. 

·         Liner Installation:

·         Lay down a bottom liner system, typically a geomembrane (synthetic plastic sheet) with a protective layer of compacted clay to prevent leachate from escaping into the surrounding soil. 

·         Install a leachate collection system beneath the liner to capture liquids that may seep through the waste. 

·         Waste Disposal:

·         Deposit waste in thin layers within designated cells (sections of the landfill). 

·         Regularly compact the waste using heavy machinery to reduce its volume and stabilize the landfill. 

·         Cover the waste with a layer of soil (daily cover) to minimize odor and prevent pests. 

·         Monitoring and Maintenance:

·         Continuously monitor leachate levels and quality in the collection system. 

·         Regularly inspect the landfill for potential problems like gas leaks or erosion. 

·         Closure and Capping:

·         Once a cell is full, install a final cover layer consisting of a compacted clay layer and a protective vegetation layer to prevent water infiltration and gas emissions. 

·         Implement gas collection systems to capture methane gas produced by decomposing waste for potential energy generation. 

How a Sanitary Landfill Works:

·         Decomposition Process:

When waste is deposited in the landfill, anaerobic bacteria begin to decompose organic materials, generating methane gas and leachate (liquid waste). 

·         Leachate Collection:

The liner system prevents leachate from reaching groundwater by directing it into a collection system for treatment and disposal. 

·         Gas Management:

Methane gas is collected through wells and can be used as a renewable energy source. 

Important Considerations:

·         Environmental Regulations:

Sanitary landfills must comply with strict regulations to minimize environmental impacts.

·         Waste Reduction and Recycling:

Prioritizing waste reduction and recycling can significantly reduce the amount of waste going to landfills.

·         Community Engagement:

Public awareness and involvement are crucial in managing a landfill responsibly. 

Composting:

Composting involves building a pile of organic waste, layering it, and turning it to break down the materials into compost. 

 

Construction

1.      Choose a spot in your yard with good drainage and access. 

2.      Select a bin or container for your compost pile. 

3.      Add a layer of brown materials like twigs or wood chips to the bottom of the pile. 

4.      Layer the greens and browns like lasagna. 

5.      Add water to keep the pile moist. 

6.      Cover the pile to retain heat, moisture, and nutrients. 

 

Working 

1.      Mix the layers to circulate air and help decomposition.

2.      Turn the pile regularly to increase oxygen levels.

3.      Maintain the pile.

Decomposition

1.      Bacteria and fungi break down the soft material. 

2.      The pile heats up to around 140°F (60°C). 

3.      Once the initial work is done, the pile cools down to around 80°F. 

4.      The materials have decomposed completely and can be used as compost. 

You can also use a three-bin compost system to manage compost at different stages. 

 

Compost types

There are different types of composting, including windrow composting, combination composting, and vermicomposting. 

 

Incineration:

Solid waste incineration involves burning waste at high temperatures in a controlled environment to significantly reduce its volume, often recovering heat energy from the combustion process to generate electricity, while carefully managing the resulting ash and flue gases through filtration and scrubbing systems to minimize environmental impact; the key steps include waste preparation, combustion in a furnace, heat recovery, flue gas treatment, and ash disposal.

 

Key Stages of Solid Waste Incineration:

·         Waste Preparation:

·         Sorting: Removing large items, recyclables like metals, and hazardous materials from the waste stream. 

·         Shredding: Grinding waste into smaller pieces for more efficient combustion. 

·         Combustion:

·         Feeding: Waste is fed into a combustion chamber where it is burned at very high temperatures (typically 1,800 - 2,200°F). 

·         Primary Combustion Chamber: The initial burning stage where most of the organic material is combusted. 

·         Secondary Combustion Chamber: An additional chamber to ensure complete combustion and destroy harmful pollutants. 

·         Heat Recovery:

·         Boiler: Heat from the combustion process is transferred to water, creating steam. 

·         Steam Turbine: The generated steam drives a turbine to produce electricity. 

·         Flue Gas Treatment:

·         Scrubbers: Chemicals are sprayed into the flue gas to remove acidic pollutants like sulfur dioxide. 

·         Electrostatic Precipitators: Remove particulate matter (fly ash) from the gas stream using electrostatic charges. 

·         Baghouses: Fabric filters that capture fine particles from the flue gas. 

·         Ash Management:

·         Bottom Ash: Heavy ash residue that settles at the bottom of the combustion chamber is collected and disposed of in a landfill. 

·         Fly Ash: Fine ash particles captured by the flue gas treatment systems are also disposed of in a landfill or potentially recycled depending on composition.

 

Important Considerations:

·         Environmental Regulations:

Strict emission standards must be met to control pollutants like dioxins, furans, and heavy metals. 

·         Waste Composition:

The type of waste being incinerated significantly impacts the efficiency of the process and the emissions produced. 

·         Energy Efficiency:

Optimizing heat recovery systems to maximize electricity generation from the incineration process. 

 

Health Consequences of poor Industrial waste Disposal:

Poor industrial waste disposal can lead to a range of health consequences including respiratory issues, skin diseases, cancer, gastrointestinal problems, infectious diseases, and reproductive complications, primarily affecting communities living near waste disposal sites due to exposure to toxic chemicals through contaminated air, water, and soil. 

Key health impacts of improper industrial waste disposal:

·         Respiratory problems:

Inhaling airborne pollutants from waste dumps, like dust particles and volatile organic compounds, can cause respiratory issues like asthma, bronchitis, and irritation of the airways. 

·         Skin diseases:

Direct contact with toxic chemicals in waste can lead to skin irritations, dermatitis, and other skin conditions. 

·         Cancer:

Exposure to certain hazardous chemicals present in industrial waste, like heavy metals and carcinogens, is linked to increased cancer risks. 

·         Gastrointestinal issues:

Contaminated water supplies from improper waste disposal can cause diarrhea, nausea, and other gastrointestinal problems. 

·         Infectious diseases:

Improper waste management can facilitate the spread of infectious diseases like cholera, typhoid fever, and hepatitis through contaminated water sources. 

·         Reproductive health issues:

Exposure to certain chemicals in industrial waste can disrupt hormone balance and lead to reproductive issues like infertility and birth defects. 

Factors influencing health impacts:

·         Type of waste:

The specific chemicals present in the industrial waste significantly determine the potential health risks. 

·         Proximity to disposal site:

Communities living close to waste disposal sites are at higher risk of exposure and associated health problems. 

·         Waste management practices:

Improper handling, open dumping, and lack of treatment facilities exacerbate the health risks. What can be done to mitigate these health risks:

·         Strict regulations:

Implementing and enforcing robust regulations regarding industrial waste disposal.

·         Proper waste treatment:

Utilizing appropriate technologies to treat and safely dispose of industrial waste.

·         Community awareness:

Educating communities about the health risks associated with improper waste disposal.

·         Monitoring and enforcement:

Regular monitoring of industrial facilities to ensure compliance with environmental regulations.