Transitioning to Ecofriendly Collection Approaches

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A landfill^[a] is a site for the disposal of waste materials. It is the oldest and most common form of waste disposal, although the systematic burial of waste with daily, intermediate and final covers only began in the 1940s. In the past, waste was simply left in piles or thrown into pits (known in archeology as middens).

Landfills take up a lot of land and pose environmental risks. Some landfill sites are used for waste management purposes, such as temporary storage, consolidation and transfer, or for various stages of processing waste material, such as sorting, treatment, or recycling. Unless they are stabilized, landfills may undergo severe shaking or soil liquefaction of the ground during an earthquake. Once full, the area over a landfill site may be reclaimed for other uses.

Operators of well-run landfills for non-hazardous waste meet predefined specifications by applying techniques to:^[1]

1. confine waste to as small an area as possible
2. compact waste to reduce volume^[2]

They can also cover waste (usually daily) with layers of soil or other types of material such as woodchips and fine particles.

During landfill operations, a scale or weighbridge may weigh waste collection vehicles on arrival and personnel may inspect loads for wastes that do not accord with the landfill's waste-acceptance criteria.^[2] Afterward, the waste collection vehicles use the existing road network on their way to the tipping face or working front, where they unload their contents. After loads are deposited, compactors or bulldozers can spread and compact the waste on the working face. Before leaving the landfill boundaries, the waste collection vehicles may pass through a wheel-cleaning facility. If necessary, they return to the weighbridge for re-weighing without their load. The weighing process can assemble statistics on the daily incoming waste tonnage, which databases can retain for record keeping. In addition to trucks, some landfills may have equipment to handle railroad containers. The use of "rail-haul" permits landfills to be located at more remote sites, without the problems associated with many truck trips.

Typically, in the working face, the compacted waste is covered with soil or alternative materials daily. Alternative waste-cover materials include chipped wood or other "green waste",^[3] several sprayed-on foam products, chemically "fixed" bio-solids, and temporary blankets. Blankets can be lifted into place at night and then removed the following day prior to waste placement. The space that is occupied daily by the compacted waste and the cover material is called a daily cell. Waste compaction is critical to extending the life of the landfill. Factors such as waste compressibility, waste-layer thickness and the number of passes of the compactor over the waste affect the waste densities.

The term landfill is usually shorthand for a municipal landfill or sanitary landfill. These facilities were first introduced early in the 20th century, but gained wide use in the 1960s and 1970s, in an effort to eliminate open dumps and other "unsanitary" waste disposal practices. The sanitary landfill is an engineered facility that separates and confines waste. Sanitary landfills are intended as biological reactors (bioreactors) in which microbes will break down complex organic waste into simpler, less toxic compounds over time. These reactors must be designed and operated according to regulatory standards and guidelines (See environmental engineering).

Usually, aerobic decomposition is the first stage by which wastes are broken down in a landfill. These are followed by four stages of anaerobic degradation. Usually, solid organic material in solid phase decays rapidly as larger organic molecules degrade into smaller molecules. These smaller organic molecules begin to dissolve and move to the liquid phase, followed by hydrolysis of these organic molecules, and the hydrolyzed compounds then undergo transformation and volatilization as carbon dioxide (CO₂) and methane (CH₄), with rest of the waste remaining in solid and liquid phases.

During the early phases, little material volume reaches the leachate, as the biodegradable organic matter of the waste undergoes a rapid decrease in volume. Meanwhile, the leachate's chemical oxygen demand increases with increasing concentrations of the more recalcitrant compounds compared to the more reactive compounds in the leachate. Successful conversion and stabilization of the waste depend on how well microbial populations function in syntrophy, i.e. an interaction of different populations to provide each other's nutritional needs.:^[4]

The life cycle of a municipal landfill undergoes five distinct phases:^[5][4]

As the waste is placed in the landfill, the void spaces contain high volumes of molecular oxygen (O₂). With added and compacted wastes, the O₂ content of the landfill bioreactor strata gradually decreases. Microbial populations grow, density increases. Aerobic biodegradation dominates, i.e. the primary electron acceptor is O₂.

The O₂ is rapidly degraded by the existing microbial populations. The decreasing O₂ leads to less aerobic and more anaerobic conditions in the layers. The primary electron acceptors during transition are nitrates and sulphates since O₂ is rapidly displaced by CO₂ in the effluent gas.

Hydrolysis of the biodegradable fraction of the solid waste begins in the acid formation phase, which leads to rapid accumulation of volatile fatty acids (VFAs) in the leachate. The increased organic acid content decreases the leachate pH from approximately 7.5 to 5.6. During this phase, the decomposition intermediate compounds like the VFAs contribute much chemical oxygen demand (COD). Long-chain volatile organic acids (VOAs) are converted to acetic acid (C₂H₄O₂), CO₂, and hydrogen gas (H₂). High concentrations of VFAs increase both the biochemical oxygen demand (BOD) and VOA concentrations, which initiates H₂ production by fermentative bacteria, which stimulates the growth of H₂-oxidizing bacteria. The H₂ generation phase is relatively short because it is complete by the end of the acid formation phase. The increase in the biomass of acidogenic bacteria increases the amount of degradation of the waste material and consuming nutrients. Metals, which are generally more water-soluble at lower pH, may become more mobile during this phase, leading to increasing metal concentrations in the leachate.

The acid formation phase intermediary products (e.g., acetic, propionic, and butyric acids) are converted to CH₄ and CO₂ by methanogenic microorganisms. As VFAs are metabolized by the methanogens, the landfill water pH returns to neutrality. The leachate's organic strength, expressed as oxygen demand, decreases at a rapid rate with increases in CH₄ and CO₂ gas production. This is the longest decomposition phase.

The rate of microbiological activity slows during the last phase of waste decomposition as the supply of nutrients limits the chemical reactions, e.g. as bioavailable phosphorus becomes increasingly scarce. CH₄ production almost completely disappears, with O₂ and oxidized species gradually reappearing in the gas wells as O₂ permeates downwardly from the troposphere. This transforms the oxidation–reduction potential (ORP) in the leachate toward oxidative processes. The residual organic materials may incrementally be converted to the gas phase, and as organic matter is composted; i.e. the organic matter is converted to humic-like compounds.^[6]

Landfills have the potential to cause a number of issues. Infrastructure disruption, such as damage to access roads by heavy vehicles, may occur. Pollution of local roads and watercourses from wheels on vehicles when they leave the landfill can be significant and can be mitigated by wheel washing systems. Pollution of the local environment, such as contamination of groundwater or aquifers or soil contamination may occur, as well.

When precipitation falls on open landfills, water percolates through the garbage and becomes contaminated with suspended and dissolved material, forming leachate. If this is not contained it can contaminate groundwater. All modern landfill sites use a combination of impermeable liners several metres thick, geologically stable sites and collection systems to contain and capture this leachate. It can then be treated and evaporated. Once a landfill site is full, it is sealed off to prevent precipitation ingress and new leachate formation. However, liners must have a lifespan, be it several hundred years or more. Eventually, any landfill liner could leak,^[7] so the ground around landfills must be tested for leachate to prevent pollutants from contaminating groundwater.

Rotting food and other decaying organic waste create decomposition gases, especially CO₂ and CH₄ from aerobic and anaerobic decomposition, respectively. Both processes occur simultaneously in different parts of a landfill. In addition to available O₂, the fraction of gas constituents will vary, depending on the age of landfill, type of waste, moisture content and other factors. For example, the maximum amount of landfill gas produced can be illustrated a simplified net reaction of diethyl oxalate that accounts for these simultaneous reactions:^[8]

4 C₆H₁₀O₄ + 6 H₂O → 13 CH₄ + 11 CO₂

On average, about half of the volumetric concentration of landfill gas is CH₄ and slightly less than half is CO₂. The gas also contains about 5% molecular nitrogen (N₂), less than 1% hydrogen sulfide (H₂S), and a low concentration of non-methane organic compounds (NMOC), about 2700 ppmv.^[8]

Landfill gases can seep out of the landfill and into the surrounding air and soil. Methane is a greenhouse gas, and is flammable and potentially explosive at certain concentrations, which makes it perfect for burning to generate electricity cleanly. Since decomposing plant matter and food waste only release carbon that has been captured from the atmosphere through photosynthesis, no new carbon enters the carbon cycle and the atmospheric concentration of CO₂ is not affected. Carbon dioxide traps heat in the atmosphere, contributing to climate change.^[9] In properly managed landfills, gas is collected and flared or recovered for landfill gas utilization.

Poorly run landfills may become nuisances because of vectors such as rats and flies which can spread infectious diseases. The occurrence of such vectors can be mitigated through the use of daily cover.

Other potential issues include wildlife disruption due to occupation of habitat^[10] and animal health disruption caused by consuming waste from landfills,^[11] dust, odor, noise pollution, and reduced local property values.

Gases are produced in landfills due to the anaerobic digestion by microbes. In a properly managed landfill, this gas is collected and used. Its uses range from simple flaring to the landfill gas utilization and generation of electricity. Landfill gas monitoring alerts workers to the presence of a build-up of gases to a harmful level. In some countries, landfill gas recovery is extensive; in the United States, for example, more than 850 landfills have active landfill gas recovery systems.^[12]

A Solar landfill is a repurposed used landfill that is converted to a solar array solar farm.^[13]

Landfills in Canada are regulated by provincial environmental agencies and environmental protection legislation.^[14] Older facilities tend to fall under current standards and are monitored for leaching.^[15] Some former locations have been converted to parkland.

In the European Union, individual states are obliged to enact legislation to comply with the requirements and obligations of the European Landfill Directive.

The majority of EU member states have laws banning or severely restricting the disposal of household trash via landfills.^[16]

Landfilling is currently the major method of municipal waste disposal in India. India also has Asia's largest dumping ground in Deonar, Mumbai.^[17] However, issues frequently arise due to the alarming growth rate of landfills and poor management by authorities.^[18] On and under surface fires have been commonly seen in the Indian landfills over the last few years.^[17]

Landfilling practices in the UK have had to change in recent years to meet the challenges of the European Landfill Directive. The UK now imposes landfill tax upon biodegradable waste which is put into landfills. In addition to this the Landfill Allowance Trading Scheme has been established for local authorities to trade landfill quotas in England. A different system operates in Wales where authorities cannot 'trade' amongst themselves, but have allowances known as the Landfill Allowance Scheme.

U.S. landfills are regulated by each state's environmental agency, which establishes minimum guidelines; however, none of these standards may fall below those set by the United States Environmental Protection Agency (EPA).^[19]

Permitting a landfill generally takes between five and seven years, costs millions of dollars and requires rigorous siting, engineering and environmental studies and demonstrations to ensure local environmental and safety concerns are satisfied.^[20]

• Municipal solid waste: takes in household waste and nonhazardous material. Included in this type of landfill is a Bioreactor Landfill that specifically degrades organic material.
• Industrial waste: for commercial and industrial waste. Other related landfills include Construction and Demolition Debris Landfills and Coal Combustion Residual Landfills.
• Hazardous waste^[21] or PCB waste:^[22] Polychlorinated Biphenyl (PCB) landfills that are monitored in the United States by the Toxic Substances Control Act of 1976 (TSCA).

The status of a landfill's microbial community may determine its digestive efficiency.^[23]

Bacteria that digest plastic have been found in landfills.^[24]

One can treat landfills as a viable and abundant source of materials and energy. In the developing world, waste pickers often scavenge for still-usable materials. In commercial contexts, companies have also discovered landfill sites, and many^[quantify] have begun harvesting materials and energy.^[25] Well-known examples include gas-recovery facilities.^[26] Other commercial facilities include waste incinerators which have built-in material recovery. This material recovery is possible through the use of filters (electro filter, active-carbon and potassium filter, quench, HCl-washer, SO₂-washer, bottom ash-grating, etc.).

In addition to waste reduction and recycling strategies, there are various alternatives to landfills, including waste-to-energy incineration, anaerobic digestion, composting, mechanical biological treatment, pyrolysis and plasma arc gasification. Depending on local economics and incentives, these can be made more financially attractive than landfills.

The goal of the zero waste concept is to minimize landfill volume.^[27]

Countries including Germany, Austria, Sweden,^[28] Denmark, Belgium, the Netherlands, and Switzerland, have banned the disposal of untreated waste in landfills.^{[citation needed]} In these countries, only certain hazardous wastes, fly ashes from incineration or the stabilized output of mechanical biological treatment plants may still be deposited.^{[citation needed]}

• "Modern landfills". Archived from the original on February 22, 2015. Retrieved February 21, 2015.
• "Council Directive 1999/31/EC of 26 April 1999, on the landfill of waste" (PDF). Archived from the original (PDF) on July 5, 2010. Retrieved August 29, 2005.
• "The Landfill Operation Management Advisor Web Based Expert System". Archived from the original on October 30, 2005. Retrieved August 29, 2005.
• H. Lanier Hickman Jr. and Richard W. Eldredge. "Part 3: The Sanitary Landfill". A Brief History of Solid Waste Management in the US During the Last 50 Years. Archived from the original on November 23, 2005. Retrieved August 29, 2005.cite web: CS1 maint: unfit URL (link)
• Daniel A. Vallero, Environmental Biotechnology: A Biosystems Approach. 2nd Edition. Academic Press, Amsterdam, Netherlands and Boston MA, Print Book ISBN 9780124077768; eBook ISBN 9780124078970. 2015.

Wikiquote has quotations related to Landfill.

Look up landfill in Wiktionary, the free dictionary.

Wikimedia Commons has media related to Landfills.

• US National Waste & Recycling Association
• Solid Waste Association of North America
• A Compact Guide to Landfill Operation: Machinery, Management and Misconceptions

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Environment friendly processes, or environmental-friendly processes (also referred to as eco-friendly, nature-friendly, and green), are sustainability and marketing terms referring to goods and services, laws, guidelines and policies that claim reduced, minimal, or no harm upon ecosystems or the environment.^[1]

Companies use these ambiguous terms to promote goods and services, sometimes with additional, more specific certifications, such as ecolabels. Their overuse can be referred to as greenwashing.^[2][3][4] To ensure the successful meeting of Sustainable Development Goals (SDGs) companies are advised to employ environmental friendly processes in their production.^[5] Specifically, Sustainable Development Goal 12 measures 11 targets and 13 indicators "to ensure sustainable consumption and production patterns".^[6]

The International Organization for Standardization has developed ISO 14020 and ISO 14024 to establish principles and procedures for environmental labels and declarations that certifiers and eco-labellers should follow. In particular, these standards relate to the avoidance of financial conflicts of interest, the use of sound scientific methods and accepted test procedures, and openness and transparency in the setting of standards.^[7]

Products located in members of the European Union can use the EU Ecolabel pending the EU's approval.^[8] EMAS is another EU label^[9][10] that signifies whether an organization management is green as opposed to the product.^[11] Germany also uses the Blue Angel, based on Germany's standard.^[12][13]

In Europe, there are many different ways that companies are using environmentally friendly processes, eco-friendly labels, and overall changing guidelines to ensure that there is less harm being done to the environment and ecosystems while their products are being made. In Europe, for example, many companies are already using EMAS^{[citation needed]} labels to show that their products are friendly.^[14]

Many companies in Europe make putting eco-labels on their products a top-priority since it can result to an increase in sales when there are eco-labels on these products. In Europe specifically, a study was conducted that shows a connection between eco-labels and the purchasing of fish: "Our results show a significant connection between the desire for eco-labeling and seafood features, especially the freshness of the fish, the geographical origin of the fish and the wild vs farmed origin of the fish".^[15] This article shows that eco-labels are not only reflecting a positive impact on the environment when it comes to creating and preserving products, but also increase sales. However, not all European countries agree on whether certain products, especially fish, should have eco-labels. In the same article, it is remarked: "Surprisingly, the country effect on the probability of accepting a fish eco-label is tricky to interpret. The countries with the highest level of eco-labeling acceptability are Belgium and France".^[16] According to the same analysis and statistics, France and Belgium are most likely of accepting these eco-labels.

In the United States, environmental marketing claims require caution. Ambiguous titles such as environmentally friendly can be confusing without a specific definition; some regulators are providing guidance.^[17] The United States Environmental Protection Agency has deemed some ecolabels misleading in determining whether a product is truly "green".^[18]

In Canada, one label is that of the Environmental Choice Program.^[12] Created in 1988,^[19] only products approved by the program are allowed to display the label.^[20]

Overall, Mexico was one of the first countries in the world to pass a specific law on climate change. The law set an obligatory target of reducing national greenhouse-gas emissions by 30% by 2020. The country also has a National Climate Change Strategy, which is intended to guide policymaking over the next 40 years.^[21]

The Energy Rating Label is a Type III label^[22][23] that provides information on "energy service per unit of energy consumption".^[24] It was first created in 1986, but negotiations led to a redesign in 2000.^[25]

Oceania generates the second most e-waste, 16.1 kg, while having the third lowest recycling rate of 8.8%.^[26] Out of Oceania, only Australia has a policy in policy to manage e-waste, that being the Policy Stewardship Act published in 2011 that aimed to manage the impact of products, mainly those in reference to the disposal of products and their waste.^[27] Under the Act the National Television and Computer Recycling Scheme (NTCRS) was created, which forced manufactures and importers of electrical and electronic equipment (EEE) importing 5000 or more products or 15000 or more peripherals be liable and required to pay the NTCRS for retrieving and recycling materials from electronic products.

New Zealand does not have any law that directly manages their e-waste, instead they have voluntary product stewardship schemes such as supplier trade back and trade-in schemes and voluntary recycling drop-off points. Though this has helped it costs the provider money with labor taking up 90% of the cost of recycling. In addition, e-waste is currently not considered a priority product, which would encourage the enforcement of product stewardship. In Pacific Island Regions (PIR), e-waste management is a hard task since they lack the adequate amount of land to properly dispose of it even though they produce one of the lowest amounts of e-waste in the world due to their income and population. Due to this there are large stockpiles of waste unable to be recycled safely.

Currently, The Secretariat of the Pacific Regional Environment Programme (SPREP), an organization in charge of managing the natural resources and environment of the Pacific region, is in charge of region coordination and managing the e-waste of the Oceania region.^[28] SPREP uses Cleaner Pacific 2025 as a framework to guide the various governments in the region.^[29] They also work with PacWaste (Pacific Hazardous Waste) to identify and resolve the different issues with waste management of the islands, which largely stem from the lack of government enforcement and knowledge on the matter.^[30] They have currently proposed a mandatory product stewardship policy be put in place along with an advance recycling fee which would incentivize local and industrial recycling. They are also in the mindset that the islands should collaborate and share resources and experience to assist in the endeavor.

With the help from the NTCRS, though the situation has improved they have been vocal about the responsibilities of stakeholders in the situation and how they need to be more clearly defined. In addition to there being a differences in state and federal regulations, with only Southern Australia, Australian Capital Territory, and Victoria having banned e-waste landfill, it would be possible to make this apply the rest of the region if a federal decision was made. They have also advocated for reasonable access to collection points for waste, with there being only one collection point within a 100 km radius in some cases. It has been shown that the reason some residents do not recycle is because of their distance from a collection point. In addition, there have been few campaigns to recycle, with the company, Mobile Muster, a voluntary collection program managed by the Australian Mobile Telecommunication Association, aimed to collect phones before they went to a landfill and has been doing so since 1999. Upon further study, it was found that only 46% of the public was award of the program, which later increased to 74% in 2018, but this was after an investment of $45 million from the Australian Mobile Telecommunication Association.

"Economic growth in Asia has increased in the past three decades and has heightened energy demand, resulting in rising greenhouse gas emissions and severe air pollution. To tackle these issues, fuel switching and the deployment of renewables are essential."^[31] However, as countries continue to advance, it leads to more pollution as a result of increased energy consumption. In recent years, the biggest concern for Asia is its air pollution issues. Major Chinese cities such as Beijing have received the worst air quality rankings (Li et al., 2017). Seoul, the capital of South Korea, also suffers from air pollution (Kim et al., 2017). Currently, Indian cities such as Mumbai and Delhi are overtaking Chinese cities in the ranking of worst air quality. In 2019, 21 of the world's 30 cities with the worst air quality were in India."

The environmentally friendly trends are marketed with a different color association, using the color blue for clean air and clean water, as opposed to green in western cultures. Japanese- and Korean-built hybrid vehicles use the color blue instead of green all throughout the vehicle, and use the word "blue" indiscriminately.^[32]

According to Shen, Li, Wang, and Liao, the emission trading system that China had used for its environmentally friendly journey was implemented in certain districts and was successful in comparison to those which were used in test districts that were approved by the government.^[33] This shows how China tried to effectively introduce new innovative systems to impact the environment. China implemented multiple ways to combat environmental problems even if they didn't succeed at first. It led to them implementing a more successful process which benefited the environment. Although China needs to implement policies like, "The “fee-to-tax” process should be accelerated, however, and the design and implementation of the environmental tax system should be improved. This would form a positive incentive mechanism in which a low level of pollution correlates with a low level of tax." By implementing policies like these companies have a higher incentive to not over pollute the environment and instead focus on creating an eco-friendlier environment for their workplaces. In doing so, it will lead to less pollution being emitted while there also being a cleaner environment. Companies would prefer to have lower taxes to lessen the costs they have to deal with, so it encourages them to avoid polluting the environment as much as possible.

Energy Star is a program with a primary goal of increasing energy efficiency and indirectly decreasing greenhouse gas emissions.^[34] Energy Star has different sections for different nations or areas, including the United States,^[35] the European Union^[36] and Australia.^[37] The program, which was founded in the United States, also exists in Canada, Japan, New Zealand, and Taiwan.^[38] Additionally, the United Nations Sustainable Development Goal 17 has a target to promote the development, transfer, dissemination, and diffusion of environmentally friendly technologies to developing countries as part of the 2030 Agenda.^[39]