Meghan Hodges
Crude oil is a fossil fuel that is used to make a wide range of products, from plastics to fuels for airplanes, cars, and trucks. However, finding, producing, and moving crude oil can have negative effects on the environment. Oil spills, for example, can contaminate soil and water, harm wildlife, and cause devastating explosions and fires. These spills can occur from accidents at oil wells, pipelines, or during transportation by ships, trains, and trucks. In addition to the immediate environmental impact, oil spills can also have long-term effects, with oil seeping into the sediment and causing damage years later. The release of oil into the ocean, whether from spills or chronic discharges, is a major environmental concern, and governments and industries are working to develop standards and regulations to reduce the potential for accidents and improve spill cleanup procedures.
| Characteristics | Values |
|---|---|
| Crude oil composition | A mixture of hydrocarbons, made up of light, medium, and heavy chemicals |
| Light chemical examples | Benzene, xylene, toluene, and ethylbenzene |
| Health impact | Inhaling oil droplets and particles can irritate the eyes, nose, throat, and lungs |
| May cause short-term symptoms like dizziness, headaches, and respiratory issues | |
| Environmental impact | Oil spills contaminate soil and water and may cause explosions and fires |
| Disturbance of marine and land ecosystems | |
| Harmful to wildlife, including seabirds and marine mammals | |
| Oil spills can make seafood unsafe to eat | |
| Regulatory response | Oil Pollution Act of 1990 holds responsible parties accountable for cleanup and restoration |
| International Maritime Organization established double-hull standards for new oil tankers in 1992 | |
| U.S. government replaced the Minerals Management Service with the BOEM and BSEE for better environmental enforcement |
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What You'll Learn
Oil spills and their environmental impact
Crude oil is a mixture of hydrocarbons, composed of light, medium, and heavy chemicals. The lighter chemicals, such as benzene, xylene, toluene, and ethylbenzene, are air toxics that can be harmful if inhaled. Oil spills can occur during the transportation of crude oil by ships, pipelines, trucks, and trains, or during drilling operations. These spills can have significant environmental impacts and are challenging to clean up.
Oil spills contaminate soil and water and can result in devastating explosions and fires. They can harm marine life, such as fish and shellfish, and birds and other wildlife. The physical smothering of organisms by heavy oils can affect their ability to respire, feed, and regulate body temperature. Lighter chemical components can be absorbed into organs, tissues, and cells, causing toxic effects. Oil spills can also lead to habitat loss, altering migration patterns and disrupting life cycles, as well as impacting local economies through the closure of beaches, parks, and fisheries.
The magnitude of the harm caused by an oil spill depends on factors such as the amount and type of oil, location, season, weather, and the effectiveness of the cleanup response. Some oil spills are small, such as those that occur during ship refueling, but they can still cause damage, especially in sensitive environments like beaches, mangroves, and wetlands. Large oil spills, on the other hand, are major disasters that typically occur when pipelines break or oil tanker ships sink.
In response to oil spills, federal, state, and tribal agencies work together with the responsible party to assess the impacts and fund restoration projects. This process is called Natural Resource Damage Assessment (NRDA). Restoration projects aim to actively bolster the environment, such as by building marshland or protecting bird nesting habitats, to speed up the recovery of different species and habitats. Technological advances and the enforcement of safety and environmental regulations have helped to reduce the occurrence and impact of oil spills. For example, the International Maritime Organization's double-hull standards for new oil tankers have significantly reduced the amount of oil spilled from ships.
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Crude oil composition and toxicity
Crude oil is a mixture of hydrocarbons, made up of light, medium, and heavy chemicals. The light parts include air toxics such as benzene, xylene, toluene, and ethylbenzene. These toxic chemicals can be harmful to breathe and can cause short-term symptoms like dizziness, headaches, and respiratory issues. In addition, inhaling oil droplets and particles during cleanup can irritate the eyes, nose, throat, and lungs.
The toxicity level of crude oil indicates its potential harm to the environment, humans, and living organisms. Crude oils are classified into four categories based on their geographical location, chemical composition, and physical characteristics. 'Sweet' crude oil is more desirable due to its low sulphur content, while 'sour' crude oil contains higher sulphur levels. 'Light' crudes have a higher percentage of light hydrocarbons, making them easier to refine, whereas 'heavy' crudes require additional refining processes due to their high concentrations of bitumen, sulphur, and other metals.
The U.S. Environmental Protection Agency (EPA) has developed a classification system for crude oils that is more useful in spill response scenarios. Class A oils are light, volatile oils that can penetrate porous surfaces and may persist in the environment. They are highly toxic to humans, fish, and other organisms. Class C oils are heavy, tarry oils that are not highly toxic but can be challenging to dispose of once they penetrate porous surfaces. They can smother or drown wildlife. Class D oils are relatively non-toxic, thick, heavy crude oils that do not easily penetrate porous surfaces. However, when heated, they can melt and coat surfaces, making cleanup difficult.
The impact of crude oil spills on the environment is significant. Most spills occur due to accidents at oil wells or during transportation through pipelines, ships, trains, and trucks. Oil spills contaminate soil and water, harm sea creatures, and make seafood unsafe to eat. They can also cause devastating explosions and fires. To address these issues, governments and industries are working to develop standards, regulations, and procedures to reduce accidents and improve spill cleanup.
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Sources of oil pollution
Oil spills can occur anywhere oil is drilled, transported, or used, and they are more common than one might think. Oil spills can be both natural and anthropogenic. Natural seepage from the sea floor can occur when hydrocarbons naturally migrate from underground reservoirs and eventually reach the water's surface. These seeps can be found in various locations, including the ocean floor, lake beds, or even on land. Earthquakes or other geological events, such as underwater volcanic eruptions, can also cause fractures in the Earth's crust, allowing oil and gas to escape from underground reservoirs and reach water bodies.
However, according to Eos, a science magazine of the American Geophysical Union, 90% of the world's oil spills are caused by humans, not nature. The most common accidental, human-originating oil spill causes are collisions that happen during shipping and tanker accidents. These collisions between vessels, such as ships or barges, can damage their hulls, leading to oil leaks or spills. Another common accident is when a vessel runs aground, accidentally going ashore or getting stuck on the bottom of a lake or another body of water. Aging or poorly maintained vessels can experience structural failures, such as hull breaches or pipeline failures, resulting in oil spills.
Oil spills can also occur during the storage, handling, and transportation of oil and oil products. For example, oil may spill while refueling a ship, or through leaks in underground and aboveground storage tanks. Oil spills can also be caused by intentional discharges, such as when regular activities like changing car oil result in oil being discharged into a drain or sewer system.
Oil spills can have severe environmental and economic consequences. They can harm marine life, make seafood unsafe to eat, and impact coastal ecosystems and human health. Oil spills can also contaminate drinking water supplies and increase fire hazards.
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Oil pollution regulations and standards
Oil Pollution Act of 1924
The Oil Pollution Act of 1924 was a landmark legislation passed by the United States Congress. This act was a response to the widespread pollution caused by oil discharges from vessels into navigable waters. It outlawed such discharges for the first time and authorized punishment and fines for violators. However, this act was narrowly focused and did not address accidental oil releases.
Oil Pollution Act of 1961
Building upon the 1924 act, the Oil Pollution Act of 1961 expanded the scope of oil discharge prohibition to within 50 miles of land. This act also introduced regulations for the installation of equipment and record-keeping requirements.
Oil Pollution Act of 1973
Signed into law by President Nixon, the Oil Pollution Act of 1973 focused on vessel discharges of oil, bringing the United States into compliance with international laws.
Clean Water Act (CWA)
Passed in 1972, the Clean Water Act established the basic structure for regulating discharges of pollutants into US waters and set quality standards for surface waters. Section 311(b)(3) of the CWA expressly prohibits the discharge of oil or hazardous substances into waters in quantities that may be harmful. Sections 311(c) and (e) empower the federal government to respond to these discharges by issuing orders to the responsible parties.
Oil Pollution Act of 1990 (OPA90)
The Oil Pollution Act of 1990 was a comprehensive piece of legislation that fundamentally changed how the US responded to oil spills. It addressed critical details such as liability, damages, and regulatory changes. This act requires oil storage facilities and vessels to submit plans outlining their response to large discharges. It also includes the requirement for facilities to have a written plan certified by a professional engineer, maintain secondary containment for oil storage, and keep updated contact lists for relevant agencies in case of a spill.
National Environmental Policy Act
The National Environmental Policy Act, signed in the early 1970s, established national environmental policies and goals for the protection, maintenance, and enhancement of the environment.
SPCC Plans and Oil Pollution Prevention
The US Fish and Wildlife Service has outlined SPCC (Spill Prevention, Control, and Countermeasure) Plans and oil pollution prevention guidelines. These include training requirements for personnel involved with the operation of oil equipment, tank integrity testing, and record-keeping protocols for oil sheen discovery and elimination.
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Oil pollution cleanup and restoration
Crude oil is a mixture of hydrocarbons, made up of light, medium, and heavy chemicals. The lighter parts include air toxics such as benzene, xylene, toluene, and ethylbenzene, which are harmful to breathe. Oil spills can contaminate soil and water, harm marine life, and cause devastating explosions and fires.
Shoreline Flushing/Washing
This method involves using water hoses to rinse oil from the shoreline into the water, where it can be more easily collected. While this technique can effectively remove oil from the shoreline, it may require large amounts of water and can impact the surrounding area.
Booms
Booms are long, floating, interconnected barriers used to contain and minimise the spread of spilled oil. They help prevent oil from reaching sensitive areas or spreading over a larger area, making cleanup more manageable.
Vacuums
Industrial-sized vacuum trucks are employed to suction oil from the shoreline or the surface of the water. This method is particularly effective in removing large amounts of oil quickly and efficiently.
Manual Removal
Cleanup crews use shovels or other hand tools to manually pick up oil from the shoreline, especially in areas where heavy machinery cannot access. This method is labour-intensive but useful for remote or challenging locations.
Mechanical Removal
When access is possible, heavy machinery such as backhoes or front-end loaders are utilised to remove oil from the affected areas. This method speeds up the cleanup process and reduces the manual labour required.
Chemical Dispersion
Chemical dispersion involves applying specific chemicals to the spilled oil to break it down into small droplets, facilitating its removal from the water surface. This technique is useful for breaking up large oil slicks and improving the efficiency of other cleanup methods.
Burning
Also known as "in-situ burning," this method involves setting fire to freshly spilled oil while it is still floating on the water surface. This technique is used to quickly eliminate large amounts of oil, but it must be carefully controlled to prevent further environmental damage.
Natural Remediation
Natural remediation leverages the inherent power of biological processes to address oil spills. This includes developing genetically engineered microorganisms with enhanced oil-degrading capabilities, offering a promising approach to accelerating remediation processes.
Software and Modelling Tools
Various software tools, such as GNOME® (General NOAA Operational Modeling Environment), CAFE (Chemical Aquatic Fate and Effects) database, and ADIOS (Automated Data Inquiry for Oil Spills), are used to predict the movement and spread of oil, assess potential harm to aquatic life, and understand how different types of oil change and degrade in the environment.
The restoration process also involves assessing the impacts of the spill and securing funding for restoration projects. The Oil Pollution Act of 1990 established that those responsible for oil spills can be held accountable for the cleanup and restoration costs. Federal, state, and tribal agencies work together to select restoration projects with input from the public.
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Frequently asked questions
Crude oil is a fossil fuel that is used to make a wide range of fuels and products. It is the liquid remains of ancient plants and animals. Crude oil is used to make the petroleum products we use to fuel airplanes, cars, and trucks; to heat homes; and to make products such as medicines and plastics.
Crude oil is a pollutant when it is spilled into the ocean or on land. Oil spills can harm sea creatures, ruin beaches, and make seafood unsafe to eat. Oil spills can also contaminate soil and water and may cause devastating explosions and fires. The hydrocarbons in crude oil, including benzene, xylene, toluene, and ethylbenzene, are harmful to breathe and can cause short-term symptoms such as dizziness, headaches, and respiratory issues.
Technological advances in exploration, production, and transportation of oil, as well as the enforcement of safety and environmental laws and regulations, have helped to avoid and reduce the negative effects of crude oil spills. The International Maritime Organization established double-hull standards for new oil tankers in the International Convention for the Prevention of Pollution from Ships (MARPOL) in 1992, which significantly reduced the amount of oil spilled from ships. The Oil Pollution Act of 1990 established that those responsible for oil spills can be held accountable for the cleanup and restoration of the affected areas.
