Bronte Wells
Phosphorus pollution is a pressing environmental issue that arises from the excessive use of fertilizers and manure in agriculture, compounded by soil erosion. Phosphorus, a critical nutrient for all life, is commonly found in commercial fertilizers. When excess phosphorus from agricultural runoff, sewage, or industrial discharges enters water bodies, it fuels the growth of algae and aquatic plants. While these organisms provide food and habitat for aquatic life, their uncontrolled proliferation leads to algal blooms, which degrade water quality, block sunlight, and deplete oxygen levels, posing risks to both the environment and human health. Addressing phosphorus pollution requires sustainable practices, such as reducing fertilizer usage, improving soil health, and implementing effective nutrient management strategies.
| Characteristics | Values |
|---|---|
| Definition | Phosphorus pollution is a form of water pollution caused by an excess of phosphorus entering the water. |
| Sources | Phosphorus pollution comes from both regulated and non-regulated sources. Sources include agricultural fertilizers, manure, organic wastes in sewage, industrial discharges, and wastewater treatment plants. |
| Effects | Phosphorus pollution can fuel toxic algal blooms, which are harmful to humans, wildlife, and aquatic life. It can also lead to low dissolved oxygen levels in the water, degraded habitat conditions, and illnesses in fish. |
| Prevention | To reduce phosphorus pollution, it is recommended to use less fertilizer on lawns and croplands, implement buffer strips to filter runoff, follow feedlot operation and manure application rules, and use phosphorus-free lawn fertilizer. |
| Targets | The Kunming-Montreal Global Biodiversity Framework calls for a 50% reduction in excess nutrients lost to the environment by 2030. The Our Phosphorus Future report aims for a 50% reduction in global phosphorus pollution and a 50% increase in phosphorus recycling by 2050. |
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What You'll Learn
Phosphorus in fertilizers
Phosphorus is a vital component for plant growth and is, therefore, a crucial agricultural input. It is a macronutrient that plants primarily absorb from the soil, aiding in the development of new tissue and the division of cells. Phosphorus is particularly essential in modern agricultural practices where intensive farming leads to soil depletion.
Phosphorus fertilizers are manufactured from rock phosphate. Finely ground rock phosphate is treated with sulfuric acid to produce phosphoric acid, which is then used to manufacture other fertilizers. Phosphorus fertilizers are often characterized by their N-P-K (nitrogen-phosphorus-potassium) composition.
Phosphorus is not readily available in most soils, so it is necessary to add it through fertilizers. However, it is important to use the right amount of phosphorus. Excess phosphorus can be harmful to the environment, causing eutrophication (a reduction of dissolved oxygen in water bodies caused by an increase in minerals and organic nutrients) of rivers and lakes. This reduced level of oxygen can kill fish and other aquatic life.
To reduce phosphorus pollution, farmers can use phosphorus-free lawn fertilizers, follow feedlot operation and manure application rules to prevent runoff, and adopt regenerative agricultural practices such as planting cover crops and avoiding tilling the soil.
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Phosphorus in manure
Phosphorus is a common element in agricultural fertilizers, manure, and organic wastes in sewage and industrial discharges. Manure is rich in nutrients, including trace elements necessary for crop growth. Approximately 60-85% of the phosphorus in feeds is excreted in the manure. These nutrients can replace fertilizer needed for pasture or crop growth, eliminating the need to purchase fertilizers.
The use of manure can lessen the need for phosphorus-based fertilizers. However, improper use of manure can result in environmental damage. One of the major concerns associated with manure application is the buildup of phosphorus in soils, which can impact surface water quality. Excessive levels of phosphorus in water often promote eutrophication and cause water quality problems. These problems limit water use for fisheries, recreation, industry, and drinking due to the increased growth of undesirable algae and aquatic weeds, and a shortage of oxygen.
To prevent phosphorus loss, it is important to manage phosphorus sources and reduce runoff and erosion. Conservation tillage, buffer strips, riparian zones, terracing, contour tillage, and cover crops can help reduce phosphorus runoff and protect water resources. Applying manure at a uniform rate can also help, as producers can subtract the phosphorus content of the applied manure from the fertilizer needs of the field.
The livestock sector must explore ways of recovering phosphorus from manure. Proper calibration of a manure spreader will help ensure the correct rate and uniform application. Applying and incorporating manure too early, such as in the fall or early winter, or on saturated soils in high rainfall areas, could result in significant groundwater contamination.
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Phosphorus in wastewater
Phosphorus is a naturally occurring mineral found in phosphate rock. It is an essential building block found in animal and plant cells and is widely used in animal feed and fertilizers. Phosphorus is water-soluble, and large quantities can enter drinking water, rivers, groundwater aquifers, and reservoirs.
Sources of Phosphorus in Wastewater
Effects of Phosphorus in Wastewater
High levels of phosphorus in water promote the growth of toxic algae blooms, which can have devastating effects on marine life and ecosystems. These algae blooms reduce oxygen levels in the water, killing fish and other aquatic animals. They also release harmful algal toxins, which pose a significant health risk to humans, including skin irritation and illness from swimming in affected waters.
Phosphorus Removal from Wastewater
The removal of phosphorus from wastewater is essential for protecting the environment and ensuring the health and safety of the public. There are several methods for removing phosphorus, including chemical, biological, and physical means, or a combination of these.
Chemical precipitation, or chemical phosphorus removal, involves adding a coagulant, such as aluminum, calcium, or iron, to the wastewater to form a phosphorus precipitate that settles out. Biological phosphorus removal utilizes bacteria that can accumulate and process polyphosphate, removing phosphorus from the water. Physical phosphorus removal methods include membrane technologies and sand filtration.
Reducing Phosphorus Pollution
Reducing phosphorus pollution requires long-term strategies and changes in agricultural and wastewater management practices. This includes using less fertilizer, implementing buffer strips to filter runoff, and following rules for feedlot operations and manure application to prevent runoff. The UNEP has also set targets for a 50% reduction in excess nutrients lost to the environment by 2030.
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Environmental impact
Phosphorus is a critical nutrient required for all life. Phosphate (PO4), the most common form of phosphorus used by biological organisms, plays a major role in the formation of DNA, cellular energy, and cell membranes. In appropriate quantities, phosphorus can be used by vegetation and soil microbes for normal growth.
However, in excess quantities, phosphorus can have devastating effects on the environment when it seeps into it. It can lead to water quality problems such as eutrophication and harmful algal blooms. Algae generally blooms in hot, calm weather and may be disrupted by rain and winds. Even small increases in phosphorus levels can negatively affect water quality and biological conditions. Excess phosphorus feeds algae growth, making waters less attractive for swimming and other aquatic recreation. It also degrades the conditions that fish, bugs, wildlife, and desired plants need to thrive. In addition, phosphorus can fuel toxic blue-green algal blooms, which are harmful to people and pets.
Sources of excess phosphorus to rivers and streams, lakes, and coastal waters include fertilizers, runoff from urban areas, leaking septic systems, or discharges from wastewater treatment plants. Rain and snowmelt can wash fertilizers and manure off agricultural land and into ditches, streams, and lakes. It can also be found in discharges of treated wastewater from communities and businesses.
To reduce phosphorus pollution, changes in agricultural practices are necessary. This includes the use of manure, which can lessen the need for phosphorus-based fertilizers. Farmers can also plant cover crops and avoid tilling the soil, which will improve soil health and reduce the need for fertilizer. Synthetic fertilizers should only be used at the stage when crops need phosphorus the most.
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Reducing phosphorus pollution
Phosphorus is one of the most important nutrients in agricultural systems when used and applied properly. However, in excess, phosphorus can create problems in waterways and drinking water, a process known as eutrophication. When phosphorus pollution (runoff) enters lakes, rivers and streams, it causes green scum and harmful algae blooms that can deplete waterways of oxygen, causing fish kills, damaging ecosystems or even resulting in "dead zones" in larger bodies of water.
Phosphorus pollution can be reduced through a combination of individual actions and long-term strategies. Here are some ways to reduce phosphorus pollution:
- Reducing fertilizer use: Use less fertilizer on lawns, cropland, and other areas. Choose phosphorus-free or low-phosphate fertilizers when possible.
- Proper manure management: Follow feedlot operation and manure application rules to prevent runoff. Avoid applying manure during rainy weather, and maintain mandatory setbacks from bodies of water.
- Buffer strips and landscaping: Implement management practices such as buffer strips that filter runoff. Direct downspouts towards landscapes rather than hard surfaces to reduce runoff and allow water to soak into the ground.
- Wastewater treatment: Comply with phosphorus discharge limits at wastewater treatment facilities. Improve septic systems to prevent the release of phosphorus into local water bodies or groundwater.
- Pet waste management: Pick up pet waste from yards, parks, and shorelines. Pet waste contains phosphorus and can contribute to water pollution when not disposed of properly.
- Regenerative agriculture: Farmers can adopt regenerative agriculture practices, such as planting cover crops, avoiding soil tilling, and improving soil health to reduce the need for phosphorus-based fertilizers.
- Precision fertilizer application: Synthetic fertilizers should be applied precisely when crops need phosphorus the most, ensuring that excess phosphorus does not enter the environment.
- Wastewater discharge reduction: Globally, wastewater discharges about 3 million tonnes of phosphorus into the environment annually. Treating wastewater effectively can help reduce phosphorus pollution.
- Reducing stormwater runoff: Minimise the use of hard surfaces in urban areas and cropland in rural areas to reduce phosphorus runoff into lakes and streams.
By implementing these measures, we can help protect our lakes, rivers, and streams from the negative impacts of phosphorus pollution and improve water quality for recreation, aquatic life, and ecosystems.
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Frequently asked questions
Phosphorus pollution is caused by the excessive use of fertilizers and manure, especially when compounded by soil erosion. Phosphorus is a common element in agricultural fertilizers, manure, and organic wastes in sewage and industrial discharges.
Excess phosphorus in the water stimulates the growth of algae, which leads to low dissolved oxygen levels, potential for harmful algal toxins, blockage of sunlight needed by organisms and plants in the water, and degraded habitat conditions for aquatic life.
Phosphorus pollution comes from both regulated and non-regulated sources. Sources include fertilizers, runoff from farms and urban areas, leaking septic systems, and discharges from wastewater treatment plants.
Phosphorus pollution in water can be harmful to human health, even at low levels. Excessive algae growth, or algal blooms, can produce elevated toxins and bacterial growth that can make people sick if they come into contact with polluted water, consume tainted fish or shellfish, or drink contaminated water.
Reducing phosphorus pollution requires long-term strategies such as using less fertilizer on lawns and croplands, implementing buffer strips to filter runoff, and following rules for feedlot operations and manure application to prevent runoff.
