Bronte Wells
Soil pollution, also known as land pollution, is the contamination of soil with toxic substances that pose a risk to human health and the ecosystem. It is caused by human activities such as industrial and agricultural processes, as well as natural processes. Examples of soil pollution include the presence of heavy metals, pesticides, and organic contaminants such as lead, mercury, arsenic, and petroleum hydrocarbons. Soil pollution can have adverse effects on human health, causing headaches, nausea, fatigue, skin rashes, and eye irritation, and more severe conditions like cancer and congenital disorders. It also disrupts the delicate balance of the ecosystem, affecting soil-dwelling organisms and their roles in nutrient cycling, decomposition, and soil structure formation. The contamination of soil is a serious environmental concern that requires attention and remediation to mitigate its impacts on human health and the natural world.
| Characteristics | Values |
|---|---|
| Definition | Presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem |
| Causes | Man-made (anthropogenic) and natural causes |
| Man-made causes | Industrial activity, agricultural chemicals, improper disposal of waste, mining, military activities, technological waste, wastewater management, urban and transport infrastructure, stock breeding, farming, and more |
| Natural causes | Accumulation of toxic chemicals due to natural processes in arid environments, e.g., higher levels of perchlorate in the Atacama Desert |
| Health risks | Direct contact with contaminated soil, inhalation of soil contaminants, ingestion of contaminated food and drinking water, development of pollution-related diseases, immune system diseases, nervous system diseases, cancer, birth defects, etc. |
| Environmental impact | Reduced biodiversity, loss of organic carbon, increased salt content, compacting, acidification, chemical pollution, reduced soil fertility, and threats to soil functions |
| Remediation techniques | Excavation and disposal, aeration, thermal remediation, bioremediation, landfarming, biostimulation, bioaugmentation |
| Prevention | Reduction in the use of chemical pesticides, proper disposal of agricultural plastic waste, banning of certain pesticides, safe storage and disposal of obsolete pesticides |
| Global impact | Particularly serious in Europe, Eurasia, Asia, and North Africa; expected to drive emigration of 50-700 million people by 2050 |
| Vulnerable groups | Children, the elderly, and poorer households living close to industrial sites |
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What You'll Learn
Industrial activity, agricultural chemicals, and improper waste disposal
Soil pollution is defined as the presence of toxic chemicals or contaminants in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem. There are two main causes of soil pollution: anthropogenic (man-made) and natural. Man-made contaminants are the primary cause of soil pollution and can be attributed to industrial activity, agricultural chemicals, and improper waste disposal.
Industrial Activity
Industrial activities such as mining, quarrying, manufacturing, energy production, construction, and transportation are significant contributors to soil pollution. Mining, for example, can result in the release of trace elements, wastes, and emissions during the extraction and processing of materials. Without proper long-term maintenance, tailing dams, and rock waste deposits from mining sites can be subject to weathering and erosion, dispersing contaminants into the surrounding soil. Manufacturing sites have been found to pollute surrounding areas with various chemicals, even after certain production methods have been banned. For instance, the production of polychlorinated biphenyls (PCBs) was banned in 2004, yet pollution from PCBs and chlorinated paraffins, which are used as substitutes, continues to affect soils. Pharmaceutical industries are another source of soil pollution, releasing substances containing active pharmaceutical ingredients and other chemical substances into the environment.
Agricultural Chemicals
Agricultural practices that involve the use of pesticides, fertilizers, herbicides, and manure can contaminate soils with toxic chemicals. Pesticides are a significant concern, as they can directly pollute soils through application and indirectly through atmospheric deposition and flooding. The use of pesticides has been regulated through conventions such as the Stockholm Convention and the Rotterdam Convention, which aim to control and eliminate persistent organic pollutants (POPs). However, the improper storage and disposal of pesticides can still lead to soil pollution. Other agricultural contaminants include mineral fertilizers, organic fertilizers (manure and sewage sludge), wastewater for irrigation, plastic materials, and rural wastes.
Improper Waste Disposal
Improper waste disposal, including littering and inadequate management of urban and industrial waste, contributes significantly to soil pollution. Litter, such as cigarette butts and food wrappers discarded improperly, accumulates and degrades the land. Urban waste, which includes garbage, rubbish, dried sludge, and sewage, can contaminate soils with toxic substances if not managed properly. Industrial waste, such as drilling fluids and petroleum products, can also pollute soils, as seen in the case of frequent oil spills in the Niger Delta region of Nigeria due to increasing industrial activities.
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Soil pollution's health risks
Soil pollution is a critical environmental concern, as it poses many health hazards to humans and other living organisms. Soil can become polluted through human activities, such as the improper use of pesticides, industrial activities, waste management, and mineral extraction. Pollutants can also accumulate in soil naturally due to certain environmental conditions. Soil pollution has been linked to several adverse health effects, and it is estimated that pollution is responsible for at least 9 million deaths each year, with more than 60% of pollution-related deaths due to cardiovascular disease.
Soil pollution can affect human health in several ways. Firstly, it can lead to food crop contamination, as plants grown in polluted soil can accumulate high concentrations of soil pollutants, making them unsafe for consumption. This can result in various short-term health issues such as headaches, coughing, chest pain, nausea, and skin/eye irritation. Additionally, pollutants from the soil can enter the human body through inhalation of polluted soil particles or dermal exposure. Prolonged exposure to contaminated soil can lead to more severe health issues, including central nervous system depression, vital organ damage, and an increased risk of cancer.
The impact of soil pollution on human health is particularly evident in areas with high levels of contamination, such as certain agricultural and urban soils, previously flooded lands, and industrial sites. For example, in Japan, soil contaminated with cadmium from zinc/lead mines led to a high prevalence of Itai-itai disease, which is characterised by painful bone fractures and kidney dysfunction. Similarly, a German study found that arsenic, chromium, vanadium, and lead in floodplain soils along the Elbe River posed a significant health risk, especially to children.
The accumulation of toxic substances in soil can also have indirect health impacts. For example, soil pollution reduces soil fertility and crop yields, affecting food security and leading to malnutrition and hunger. Additionally, pollutants in the soil can wash into rivers, causing water pollution and further contaminating drinking water sources. The spread of antibiotics in the environment due to soil pollution can also increase pathogens' resistance to these drugs, making it harder to treat diseases.
To mitigate the health risks associated with soil pollution, global initiatives such as the United Nations' Decade on Ecosystem Restoration (2021-2030) and the EU soil strategy for 2030 aim to promote sustainable soil management practices and reduce pollution. The EU strategy sets a target of achieving zero pollution by 2050, ensuring that soil pollution no longer harms human health. These efforts are crucial in protecting human health and well-being, as healthy soils are foundational to providing nutritious food, clean water, and a stable environment.
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Natural causes of soil pollution
Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem. While most soil pollution is caused by human activity, there are some natural causes.
- Volcanoes emit a variety of elements, including aluminium, copper, fluorine, nickel, lead, manganese, mercury and zinc. These elements are spread to the soil through lava, ash and gas emissions.
- Forest fires can generate polycyclic aromatic hydrocarbons (PAHs), a group of organic contaminants that are formed as a result of the incomplete combustion of organic material. Post-fire rainfall events can contribute to the mobilisation of soil contaminants.
- Rocks can contain large amounts of toxic elements, such as lead, which can contaminate the soil.
- Precipitation can carry soil pollutants, such as compounds containing the perchlorate anion, which accumulate in some dry, arid ecosystems.
- Natural asbestos is a fibrous silicate mineral that occurs in soils formed from ultramafic rocks such as serpentine and amphibole.
- Radon is a radioactive gas produced by the natural decay of elements such as radium, thorium and uranium. It has a half-life of 3.8 days, which is enough time for it to move from bedrock to soil through soil pores.
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Man-made causes of soil pollution
Soil pollution is defined as the presence of toxic chemicals or contaminants in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem. Man-made or anthropogenic causes of soil pollution are the most common and include:
Industrial Activity and Waste Management
Industrial activities, such as those associated with metal casting factories, contribute to soil pollution by releasing toxic chemicals and heavy metals into the environment. Improper disposal of industrial waste, including technological waste, and wastewater sludge containing antibiotics, can also contaminate the soil.
Agricultural Practices
Agricultural activities, including the excessive and improper use of pesticides, fertilizers, herbicides, and manure, can lead to soil pollution. Pesticides can enter the soil through various pathways, such as rainfall or irrigation washing off treated foliage, or accidental releases from leaking pipes and spills. The use of agricultural plastics and the open burning of plastic waste can also lead to soil contamination.
Urbanization and Infrastructure Development
Urbanization and the development of transport infrastructures can result in soil pollution. The demolition of old buildings can release asbestos into the surrounding soil, while the use of lead-based paint during construction can contaminate the soil with hazardous levels of lead. Urban waste, including garbage, rubbish, dried sludge, and sewage, can further contribute to soil pollution in urban areas.
Mining and Electronic Waste
Mining activities can release toxic metals and other contaminants into the soil, affecting the abundance and activity of soil microorganisms. Electronic waste (e-waste) can also contribute to soil pollution by releasing heavy metals and other toxic chemicals into the environment.
Vehicle Emissions and Fossil Fuel Use
Vehicle emissions and the incineration of fossil raw materials contribute to soil pollution through the release of pollutants such as lead (Pb), cadmium (Cd), zinc (Zn), and polycyclic aromatic hydrocarbons (PAHs). Spills and leaks of petrol and diesel during transportation can contaminate soils with petroleum hydrocarbons.
These man-made causes of soil pollution pose significant risks to human health, food security, and the environment, underscoring the importance of sustainable practices and proper waste management to mitigate their impacts.
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Soil remediation techniques
Soil pollution is caused by the presence of toxic chemicals, pollutants, and contaminants. These include pesticides, fertilizers, herbicides, slurry, debris, manure, and radioactive substances such as radium, thorium, and uranium. Soil pollution can also be caused by industrial activity, agricultural chemicals, and the improper disposal of waste.
Excavation and Off-Site Disposal
This method involves physically removing the contaminated soil and transporting it to a designated disposal facility for treatment or containment. While effective, this technique can be costly due to the large disposal costs.
Thermal Remediation
Thermal remediation employs high temperatures to destroy or volatilize chemical contaminants in the soil. Techniques such as electrical resistance heating (ERH) and ET-DSP are used to raise subsurface temperatures, allowing for the vapor extraction of contaminants.
Bioremediation
Bioremediation uses microorganisms to break down and digest certain organic chemicals in the soil. Techniques include landfarming, biostimulation, and bioaugmentation of soil biota with commercially available microflora.
Chemical Treatment
Chemical treatments, such as solvent extraction, use organic solvents to separate and remove organic and metal contaminants from the soil. Another chemical treatment is in situ chemical oxidation, which involves reduction-oxidation (redox) reactions to convert hazardous compounds into non-hazardous or less toxic forms.
Activated Carbon (AC)-Based Technology
AC-based amendments are used for in situ remediation, removing contaminants through adsorption and degradation by reactive amendments.
Blastox 215®
Blastox 215® is a dry, fine-grain silicate chemistry used to stabilize and encapsulate heavy metal wastes, rendering them non-hazardous. It is particularly effective for contaminants such as lead (Pb), cadmium, barium, zinc, and copper.
Combined Remedies
In some cases, combining two or more remediation techniques may be necessary to effectively clean up a contaminated site. For example, the combined method of biological and chemical treatments can offer high efficiency, shorter cleanup durations, moderate costs, and low environmental impacts.
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