Greta Jimenez
Nutrient pollution occurs when there is an excessive amount of nutrients, most commonly nitrogen and phosphorus, in a body of water. This is often due to runoff from land in urban and agricultural areas, where fertilizers and animal waste are prevalent. These nutrients act as fertilizers, causing an overgrowth of algae which blocks light and results in low levels of dissolved oxygen in the water. Nutrient pollution is a pervasive issue, with over 40% of rivers, streams, and lakes in the US being affected. It is also a significant problem in China, where urbanization and agriculture have contributed to nutrient pollution. The effects of nutrient pollution can be seen in massive dead zones, such as those in the Gulf of America and the Chesapeake Bay.
| Characteristics | Values |
|---|---|
| Nutrients causing pollution | Nitrogen, Phosphorus |
| Sources of nutrients | Fertilizers, Wastewater, Automobile exhaust, Animal waste, Air pollution, Fossil fuels, Agricultural animal production |
| Impact | Massive dead zones in coastal areas, Excessive growth of algae, Low levels of oxygen dissolved in water, Harmful to environment and humans |
| Regions affected | Chesapeake Bay, Gulf of America, Long Island Sound, China, Gulf of Mexico, Mississippi River Basin |
| Actions taken | EPA published a TMDL for the Chesapeake Bay in 2010, Established Nutrient Innovations Task Group (NITG) in 2006, Published "An Urgent Call to Action" in 2009 |
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What You'll Learn
- Urban areas: stormwater runoff, excessive fertiliser use, and vehicle emissions
- Industrial areas: air pollution emissions and wastewater discharges
- Farms: surface runoff, use of synthetic fertilisers, and waste from feedlots
- Septic tanks: nutrient-rich waste entering water bodies
- Fossil fuels: emissions from burning fuel
Urban areas: stormwater runoff, excessive fertiliser use, and vehicle emissions
Nutrient pollution is a form of water pollution caused by excessive amounts of nutrients, usually nitrogen or phosphorus, entering bodies of water. This stimulates algal growth, causing eutrophication and leading to oxygen depletion in the water. Urban areas are significant contributors to nutrient pollution through stormwater runoff, excessive fertiliser use, and vehicle emissions.
Stormwater runoff is a major issue in urban areas due to the prevalence of impervious surfaces such as roads, parking lots, sidewalks, and rooftops. During rain or storms, these surfaces carry polluted stormwater directly to storm drains instead of allowing it to permeate through the soil. This polluted water often contains high levels of nitrogen and phosphorus from sources such as lawn fertilisers and atmospheric deposition. Urban stormwater runoff can lead to flooding and is a significant source of water pollution, impacting rivers, streams, and bays.
Excessive fertiliser use in urban landscapes, particularly on lawns and gardens, contributes to nutrient pollution. Fertilisers applied to turfgrass and residential catchments can be washed away by irrigation or rainfall, leading to nutrient-rich runoff. This runoff carries high concentrations of nitrogen and phosphorus into nearby water bodies, causing ecological harm.
Vehicle emissions in urban areas also play a role in nutrient pollution. Emissions from cars and other vehicles release nitrogen and other pollutants into the atmosphere, which can then be deposited onto surfaces and washed into water bodies during precipitation events. Atmospheric deposition of nitrogen contributes to the overall nutrient load in urban runoff.
In addition to stormwater runoff, excessive fertiliser use, and vehicle emissions, urban areas also face nutrient pollution from other sources. These include wastewater discharges, industrial emissions, and atmospheric deposition from various human activities. The complex interplay of these sources makes it challenging to manage nutrient pollution in urban environments, and targeted studies are necessary to effectively address this issue.
To address nutrient pollution in urban areas, it is crucial to implement sustainable practices and regulations. This includes reducing fertiliser use, promoting permeable surfaces to minimise runoff, and adopting more efficient irrigation methods. By managing nutrient sources and improving urban drainage systems, we can help mitigate the impact of nutrient pollution on aquatic ecosystems and improve water quality in urban areas.
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Industrial areas: air pollution emissions and wastewater discharges
Nutrient pollution is caused by an excess of nutrients, mainly nitrogen and phosphorus, in bodies of water. This can act as a fertiliser, causing an excessive growth of algae. This process is known as eutrophication. Nutrient pollution can be caused by runoff from urban areas, where lawn and garden fertilisers are used, and from pet and wildlife waste.
Industrial areas are a significant contributor to nutrient pollution through air pollution emissions and wastewater discharges. Air pollution is caused by the introduction of dust particles, gases, and smoke into the atmosphere, often from the burning of fossil fuels and the emission of vehicular exhaust. This can lead to photochemical smog and acid rain, which have serious health impacts, deplete the stratospheric ozone layer, and contribute to global warming.
Industrial processes such as oil and gas operations, from production and extraction to processing and distribution, release air pollution that negatively affects public health and exacerbates climate change. The burning of fossil fuels and agricultural waste also contributes to air pollution, adding reactive nitrogen to the biosphere.
Wastewater discharges from refineries and petrochemical industries are another source of nutrient pollution. These discharges can cause large-scale emissions of greenhouse gases, including methane, which has a significant impact on global warming. Logistical pollutants that rely on fossil fuel consumption are a major contributor to CO2 and overall greenhouse gas emissions.
Additionally, the release of bio-aerosols from wastewater polluted by human excreta can lead to microbial air pollution, further degrading air quality. The treatment of wastewater in purification processes can also result in the release of hydrocarbon emissions, particularly from petroleum industries, which adversely affect air quality.
To mitigate nutrient pollution, it is important to address both air pollution emissions and wastewater discharges from industrial areas. This can be achieved through the implementation of technologies such as CO2 sequestering, industrial energy efficiency, improved combustion processes, and the reduction of gas production from agricultural cultivations.
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Farms: surface runoff, use of synthetic fertilisers, and waste from feedlots
Nutrient pollution from farms is a significant environmental concern, particularly regarding surface runoff, the use of synthetic fertilisers, and waste from feedlots.
Surface Runoff
Fertilised soils and livestock operations are vulnerable to nutrient losses, with nitrogen being particularly susceptible to loss from farm fields in gaseous, nitrogen-based compounds like ammonia and nitrogen oxides. Ammonia can be harmful to aquatic life when deposited in large amounts in surface waters. While nitrogen oxide is a potent greenhouse gas, it contributes to climate change. Rainfall and snowmelt are the primary transporters of these pollutants into surface waters, with other factors such as cattle loafing in stream corridors and stream channel erosion further degrading water quality.
Farmers can minimise surface runoff by adopting conservation practices such as no-till or conservation tillage, which leaves the soil surface undisturbed from harvest to planting. Implementing buffer strips of vegetation around fields and streams can also intercept runoff and improve soil health by building up organic material that helps retain water and excess nutrients.
Synthetic Fertilisers
Excessive use of synthetic fertilisers contributes to nutrient pollution in the natural environment. Nitrogen and phosphorus are the primary nutrients added to crops through fertiliser application. Research indicates that nearly two-thirds of the nitrogen applied to crops becomes a pollutant, with more than half of the applied phosphorus meeting the same fate. This excess nitrogen and phosphorus can be washed from farm fields into waterways during rain and snowmelt, leading to eutrophication of water bodies. Eutrophication can cause hypoxic ("dead zones") conditions, resulting in fish kills and a decline in aquatic life. Additionally, excess nutrients can stimulate harmful algal blooms, producing toxins detrimental to humans and wildlife.
Waste from Feedlots
Concentrated animal feeding operations (CAFOs) generate significant waste, which poses risks to water quality. The large volume of waste and the presence of contaminants such as antibiotics and veterinary drugs can lead to the contamination of water resources with excessive nutrients, microbial pathogens, and pharmaceuticals. Poultry litter, in particular, has been associated with waterway contamination, introducing excess nutrients like nitrogen and phosphorus, causing dead zones, and spreading antibiotic-resistant bacteria.
The storage of livestock manure in pits or lagoons can result in leaks, breaks, or overflows, further contaminating groundwater. The application of manure as fertiliser on fields can lead to over-application and runoff, carrying chemicals, toxins, and bacteria into local waterways.
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Septic tanks: nutrient-rich waste entering water bodies
Nutrient pollution is the process of adding excessive amounts of nutrients, mainly nitrogen and phosphorus, to bodies of water. This can act as a fertiliser, causing the excessive growth of algae, which can be harmful to both humans and animals.
Septic systems are a major source of nutrient pollution in water bodies if they are not properly maintained. Septic systems treat wastewater from homes and businesses. When these systems are not operating properly, they may not remove enough nitrogen and phosphorus before discharging the treated water into water bodies. This can lead to an overload of nutrients in the water, causing eutrophication. Eutrophication is when the excessive growth of algae causes algal blooms, reducing water quality, killing aquatic life, and forming toxins in the water.
Approximately 20% of homes in the United States use septic systems, and it is estimated that 10-20% of these systems fail at some point during their operational lifetime. Common causes of failure include ageing infrastructure, inappropriate design, overloading with too much wastewater, and poor maintenance. Homeowners are typically responsible for maintaining their septic systems and should have them inspected regularly to protect and maintain them.
The impact of septic systems on water quality depends on how well they are maintained and used. A septic tank located near a water source can contaminate the water supply, leading to serious health problems. If wastewater is not treated properly, it can contain high levels of nitrogen from urine, food waste, and cleaning chemicals. These nitrates can cause methemoglobinemia in infants, affecting their ability to carry oxygen in their blood, which can be fatal if untreated. Other contaminants, such as E. coli and Salmonella, can also enter surface waters from failed septic systems, causing flu-like symptoms in humans exposed to the water.
To prevent septic systems from becoming a source of nutrient pollution, proper maintenance and usage are crucial. Homeowners should ensure their systems are regularly inspected and pumped as necessary. Advanced septic systems with enhanced treatment capabilities can remove more nitrogen and phosphorus from their discharges, reducing the impact on water bodies. Additionally, creating artificial wetlands can help remove nutrient runoff and mitigate the impact on water quality.
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Fossil fuels: emissions from burning fuel
The burning of fossil fuels is a major contributor to nutrient pollution. Fossil fuel combustion releases nitrogen oxides into the atmosphere, which leads to the formation of smog and acid rain. This excess nitrogen, in the form of nitrogen oxides or ammonia, eventually finds its way back to the land and nearby water bodies. The presence of excess nitrogen in water bodies acts as a fertilizer, causing excessive growth of algae, known as algal blooms, which can be harmful. These blooms block light, preventing the growth of plants like seagrasses, and when the algae and seagrass die and decay, they deplete the oxygen levels in the water, creating oxygen-deprived aquatic zones.
Nitrogen oxides are the most common nitrogen-related compounds emitted into the air by human activities, and they are released from various sources, including power generation, industry, transportation, and agriculture. Gas-powered vehicles, for instance, release nitrogen into the atmosphere, contributing to nutrient pollution. Additionally, ammonia is another nitrogen compound emitted into the air, primarily from agricultural activities but also from fossil fuels.
The impact of airborne nitrogen pollution extends beyond the air, affecting water quality and ecosystems. Excess nitrogen can travel long distances and reach coastal areas, leading to the creation of massive dead zones, such as those observed in the Gulf of America and Chesapeake Bay. Furthermore, nitrogen pollution has been linked to eutrophication, a process where excessive nutrients harm aquatic ecosystems by lowering oxygen levels, damaging crops and forests, and endangering wildlife.
To address the issue of nutrient pollution from fossil fuels, businesses and organizations can take several measures. Firstly, they can manage and reduce emissions by understanding their greenhouse gas emissions, setting long-term targets for reduction, and preparing annual greenhouse gas inventories. Secondly, improving energy efficiency not only reduces emissions but also offers economic benefits. Organizations can also buy renewable energy to reduce their environmental impact and promote energy conservation by encouraging the use of energy-efficient equipment.
The combustion of fossil fuels has been identified as the leading environmental threat to global pediatric health and equity. Fossil-fuel combustion by-products include a range of toxic air pollutants and carbon dioxide (CO2), which is the most significant human-produced climate-altering greenhouse gas. The synergy between air pollution and climate change exacerbates the harm to children, leading to respiratory illnesses, cognitive and behavioral development issues, and other chronic diseases.
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Frequently asked questions
Nutrient pollution is caused by an excess of nutrients, mainly nitrogen and phosphorus, which act as fertilisers. The main sources of nutrient pollution are agricultural and urban runoff, stormwater, wastewater, fossil fuels, and soaps and detergents.
Nutrient pollution is pervasive across the United States, with greater than 40% of rivers, streams, and lakes, and approximately 20% of coastal waters, affected. The Gulf of America, Chesapeake Bay, and the Mississippi/Atchafalaya River Basin are notable areas with high levels of nutrient pollution. China also experiences high levels of nutrient pollution, particularly in its surface waters.
Nutrient pollution can lead to eutrophication, causing excessive growth of algae. When algae and seagrass die, they decay, using up oxygen in the water and leading to low levels of dissolved oxygen. This can be harmful to fish and other aquatic life.
