Kiera Jefferson
Nitrogen and phosphorus pollution is one of the most widespread issues in the United States, threatening drinking water sources, human health, and ecosystems. The major sources of nitrogen and phosphorus pollution are human activities such as the use of fertilizers, wastewater management, fossil fuel burning, and runoff from soaps and detergents. Agriculture is one of the largest sources of nitrogen and phosphorus pollution, with animal manure, excess fertilizer, and soil erosion contributing to the issue. Stormwater runoff from urban areas and sewage treatment plants also contribute significantly to the pollution of waterways with nitrogen and phosphorus.
| Characteristics | Values |
|---|---|
| Sources of nitrogen and phosphorus pollution | Sewage treatment plants, animal feed lots, polluted runoff from crop land, urban and suburban areas, air pollution, industrial sources, agricultural runoff, stormwater, wastewater, fossil fuels, soaps and detergents, fertilizers, yard and pet waste |
| Impact | Degraded water quality, harmful algal blooms, hypoxia, acid rain, nitrogen saturation in forests, climate change, health issues, and economic issues |
| Solutions | Upgrading stormwater systems and sewage treatment plants, proper operation of septic systems, using nitrogen removal technologies, decreasing fertilizer use, conserving energy, driving less, protecting and restoring natural filters, implementing conservation measures on farms |
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What You'll Learn
- Agriculture: Animal manure, excess fertiliser, and soil erosion
- Stormwater: Precipitation carries pollutants into waterways
- Wastewater: Sewer and septic systems don't always remove enough nitrogen and phosphorus
- Fossil fuels: Burning releases nitrogen into the air
- Soaps and detergents: Runoff from use contributes to nutrient pollution
Agriculture: Animal manure, excess fertiliser, and soil erosion
Agriculture is a major contributor to nitrogen and phosphorus pollution. Animal manure, excess fertiliser, and soil erosion are significant sources of this pollution.
Animal Manure
Animal agriculture manure is a primary source of nitrogen and phosphorus pollution in surface and groundwater. Manure runoff from cropland and pastures or the discharge from animal feeding operations often reach surface and groundwater systems through surface runoff or infiltration. The nitrogen and phosphorus in manure can negatively impact water quality when they are not fully utilised by plants.
Excess Fertiliser
Nitrogen and phosphorus are the two main fertilisers that farmers add to their fields. Nearly two-thirds of the nitrogen used on crops becomes a pollutant, and more than half of the applied phosphorus faces the same fate. When farmers overapply fertilisers, excess nutrients are washed off and pollute the natural environment. This excess can be washed from farm fields into waterways during rain and snowmelt and can also leach through the soil into groundwater over time.
Soil Erosion
Soil erosion is another factor that contributes to nitrogen and phosphorus pollution in agriculture. Implementing conservation tillage practices, such as reducing the frequency and intensity of tilling, can improve soil health and reduce erosion, runoff, and soil compaction. This, in turn, decreases the chance of nutrients reaching waterways through runoff. Ensuring year-round ground cover by planting cover crops or perennial species can prevent soil erosion and nutrient loss during periods of bare ground on farm fields.
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Stormwater: Precipitation carries pollutants into waterways
Stormwater runoff is a major contributor to nitrogen and phosphorus pollution in waterways. When precipitation falls in cities and towns, the water runs off hard surfaces like roads, sidewalks, and rooftops, carrying pollutants such as nitrogen and phosphorus into local waterways. This process, known as eutrophication, occurs when excess nutrients stimulate algal growth, leading to harmful algal blooms (HABs) that produce toxins harmful to humans and ecosystems. HABs can cause skin rashes, liver and kidney damage, neurological issues, and respiratory problems.
The amount of pavement and type of landscaping can increase nitrogen and phosphorus runoff during wet weather. This is particularly true in areas with a high proportion of impervious surfaces, such as urban and suburban environments. Rainwater can carry nutrients for long distances through river and stream systems, impacting water quality far from the source of pollution.
To mitigate stormwater pollution, it is essential to upgrade stormwater management systems and implement conservation measures. This includes improving the efficiency of septic systems and wastewater treatment plants in removing nitrogen and phosphorus before discharge. Additionally, reducing fertilizer use and properly managing animal waste can help decrease nutrient runoff from agricultural sources, which is a significant contributor to stormwater pollution.
Individuals can also play a role in reducing stormwater pollution by making conscious choices around the home. Properly using and disposing of fertilizers, soaps, detergents, and pet waste can minimize nutrient runoff. Selecting phosphate-free products, using water-efficient appliances, and participating in community efforts to improve local waterway health are also effective ways to address stormwater pollution.
Overall, addressing stormwater pollution requires a combination of improved infrastructure, agricultural practices, and individual actions to prevent excess nitrogen and phosphorus from entering local waterways through runoff during precipitation events.
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Wastewater: Sewer and septic systems don't always remove enough nitrogen and phosphorus
Sewer and septic systems are responsible for treating large quantities of wastewater. These systems do not always operate properly or remove enough nitrogen and phosphorus before discharging the water into waterways. This is because wastewater treatment plants vary in their equipment and processes for treating wastewater, with some being better equipped to remove more nitrogen and phosphorus from their discharges.
Upgrading wastewater treatment systems can be expensive, but there are other approaches, such as optimization, that are much cheaper and can even result in cost savings by reducing energy demand and treatment chemicals. Various strategies to reduce nitrogen and phosphorus loads from wastewater treatment plants are being pursued across the US.
Septic systems can easily become a source of nutrient pollution if not properly maintained. Approximately 20% of homes in the US use septic systems to treat their wastewater. When a septic system is improperly managed, elevated levels of nitrogen and phosphorus can be released into local water bodies or groundwater. An estimated 10-20% of septic systems fail at some point during their operational lifetimes, with common causes including aging infrastructure, poor design, overloading, and poor maintenance.
To prevent septic system failure, homeowners should have their systems regularly inspected and pumped as necessary. It is also recommended that septic systems are not overloaded with too much wastewater in too short a period and that septic system additives are avoided, as these can be detrimental to the system or contaminate groundwater.
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Fossil fuels: Burning releases nitrogen into the air
Nitrogen is the most abundant element in the air and is essential to plant and animal life. However, human activities, such as the burning of fossil fuels, have upset the natural balance of nitrogen in the environment. Fossil fuels refer to oil, natural gas, and coal, which are burned to generate energy for electricity, transportation, and industrial processes.
The burning of fossil fuels releases nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. These nitrogen oxides, along with ammonia, are deposited back onto the land and wash into nearby water bodies. This excess nitrogen in aquatic ecosystems causes harmful algal blooms and creates oxygen-deprived zones, which are toxic to aquatic organisms. The presence of excess nitrogen in the atmosphere also has implications for air quality and human health, as nitrogen oxides are a pollutant that can cause respiratory issues.
The release of nitrogen oxides through fossil fuel combustion has disrupted the nitrogen cycle by altering the amount of nitrogen in the biosphere. This disruption has been traced back to the beginning of the Industrial Revolution, with a significant increase in nitrates corresponding to the increased use of fossil fuels. The largest shift in nitrogen isotope ratios, indicating the impact of human activity, occurred between 1950 and 1980, a period of significant growth in fossil fuel emissions.
To address the issue of nitrogen pollution from fossil fuels, efforts can be made to reduce emissions and increase energy efficiency. This includes improving energy efficiency in industrial processes and transportation, as well as transitioning to alternative energy sources to reduce the overall burning of fossil fuels.
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Soaps and detergents: Runoff from use contributes to nutrient pollution
Nutrient pollution is a widespread issue in the United States, threatening drinking water sources, human health, outdoor recreation, and ecosystem health. While nitrogen and phosphorus are natural components of aquatic ecosystems, human activities, such as the use of fertilizers, wastewater management, fossil fuel burning, and runoff from soaps and detergents, introduce excess nutrient pollution. This excess of nutrients causes harmful algal blooms (HABs), which produce toxins harmful to humans and ecosystems.
Soaps and detergents are a significant contributor to nutrient pollution, particularly in stormwater runoff. When it rains, stormwater picks up pollutants from impervious surfaces, such as roads, sidewalks, and rooftops, and transports them into nearby waterways. Soaps and detergents contain nitrogen and phosphorus, which are nutrients that can negatively impact water quality if not properly used or disposed of. The use of phosphate-based detergents further contributes to nutrient loading in water, as stormwater can mobilize phosphates, leading to an excess of nutrients in aquatic ecosystems.
The runoff from soaps and detergents can introduce various pollutants into the water, including ammonia, phenols, acids, and antibiotics. Detergents used in car wash cleaners, for example, contain surfactants or surface active agents that can kill fish eggs, damage fish gills, and reduce the fish's ability to protect themselves from parasitic and bacterial threats. The use of phosphate-free, water-based, and biodegradable car cleaners is an effective way to reduce the impact of soap and detergent runoff on aquatic life.
To minimize the contribution of soaps and detergents to nutrient pollution, proper disposal methods are essential. Instead of emptying wash buckets containing soap or detergent down storm drains or onto landscapes, it is recommended to dispose of the wastewater in sinks or toilets inside the home. Additionally, choosing phosphate-free detergents, soaps, and household cleaners can help reduce the nutrient loading in water.
While there is some debate about the effectiveness of reducing phosphorus content in detergents to combat cultural eutrophication, experiments have shown that depriving algae of phosphorus can significantly curtail their growth. The elimination of phosphorus from detergents has been estimated to bring about an immediate and massive decrease in eutrophication rates, reducing the occurrence of harmful algal blooms and their associated negative impacts on human health and ecosystems.
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Frequently asked questions
Nitrogen and phosphorus pollution is caused by human activities such as the use of fertilizers, wastewater management, fossil fuel burning, and runoff from the use of soaps and detergents. The major sources of nitrogen and phosphorus pollution include:
- Agriculture: Animal manure, excess fertilizer applied to crops and fields, and soil erosion.
- Stormwater: Precipitation that falls on cities and towns and carries pollutants into waterways.
- Sewage treatment plants: Nutrient waste travels directly from the source to water.
Agriculture is one of the largest sources of nitrogen and phosphorus pollution. Farmers frequently apply more nutrients than crops need, and the excess runs off into surface or groundwater. Agricultural production relies on natural and synthetic fertilizers, which contain high levels of nitrogen, phosphorus, and potassium. When plants do not fully utilize these nutrients, they can leave farm fields and impact air and water quality.
Stormwater, or precipitation that falls on cities and towns, picks up pollutants as it runs across hard surfaces like rooftops, sidewalks, and roads. These pollutants, including nitrogen and phosphorus, are then carried into local waterways. The amount of pavement and landscaping can increase the runoff of these nutrients during wet weather.
