Meghan Hodges
Streams are important surface water resource systems that support diverse aquatic life, provide drinking water, and irrigate water supply. However, they are increasingly threatened by pollution. Stream pollution is caused by a wide range of contaminants, including fine sediments, pesticides, plastics, chemicals, and biological wastes from industrial effluents and urban discharge. These pollutants can have detrimental effects on the health of aquatic ecosystems and, subsequently, on the health of humans who depend on these water sources. With the impact of human activity on the planet becoming more evident, the pollution of stream ecosystems has emerged as one of the world's greatest challenges.
| Characteristics | Values |
|---|---|
| Causes of Stream Pollution | Dirt, bacteria, viruses, pathogens, sewage, pesticides, fertilisers, animal waste, heavy metals, chemicals, plastics, pharmaceuticals, and industrial effluents |
| Sources of Stream Pollution | Point sources (e.g. pipes, sewers) and non-point sources (e.g. runoff from agriculture, urban areas, and storms) |
| Effects of Stream Pollution | Harmful to humans, animals, and plants; reduces biodiversity; introduces toxins into the food chain; impacts economic growth |
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What You'll Learn
Agricultural pollution
Streams are important surface water resource systems that support diverse aquatic life and provide drinking water and irrigation water supply. Stream pollution is caused by a wide range of contaminants entering the stream system from various natural and anthropogenic sources.
Agriculture is a major contributor to stream pollution. The agricultural sector is the biggest consumer of global freshwater resources, with farming and livestock production using about 70% of the earth's surface water supplies. However, agricultural activities are also a leading cause of water degradation. In the United States, agricultural pollution is the top source of contamination in rivers and streams.
Agricultural runoff is a significant source of pollution in streams. When it rains, fertilizers, pesticides, and animal waste from farms wash into waterways. Excess nitrogen and phosphorus in water can cause algal blooms, which can be harmful to people and wildlife. Pesticides used in agriculture, such as dichlorodiphenyltrichloroethane (DDT) and polychlorinated biphenyl (PCB), are commonly identified pollutants in streams.
Soil erosion, nutrient loss, and the runoff of pesticides and other contaminants from agricultural land are also leading causes of water quality impairment. Agricultural conservation practices, such as targeted fertilizer and manure application, drip irrigation, and storing livestock manure in protected areas, can help minimize runoff risks and reduce pollution.
Additionally, sediment is one of the leading pollutants in streams. Erosion can result in excessive sedimentation, which can overwhelm aquatic ecosystems and smother breeding areas. By disturbing the land as little as possible, farmers can help reduce the amount of sediment and dirt entering streams.
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Industrial effluents
Streams are important surface water resource systems that support diverse aquatic life, provide drinking water, and irrigate water supplies. They are also susceptible to pollution from a variety of natural and anthropogenic sources. Industrial effluents are one of the major contributors to stream pollution.
The pulp and paper industry is another major contributor to industrial effluents. While secondary biological treatment methods have been employed to treat wastewater, the Moving Bed Bioreactor (MBR) is now a more common technology used to reduce the concentration of harmful substances in the water circuit. However, MBRs have their disadvantages, including the requirement for large tanks and the impact of sludge settleability on pollutant removal efficiency.
The effects of industrial effluents on stream ecosystems can be detrimental. A study on the Namanve stream in Uganda found that while most water quality parameters were below the WHO maximum permissible limits, turbidity, electrical conductivity, and Escherichia coli count exceeded the standards. High levels of biochemical oxygen demand (BOD) and total nitrogen were also detected, indicating organic pollution.
Industrial wastewater creates a serious environmental problem, threatening water quality and the health of aquatic life and ecosystems. It is important to effectively treat industrial effluents to meet environmental quality standards and reduce their impact on streams and other water bodies.
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Urban stormwater drainage
One approach to addressing urban stormwater drainage is through the implementation of Sustainable Urban Drainage Systems (SUDS), Low Impact Development (LID), Best Management Practices (BMP), Water Sensitive Urban Design (WSUD), and the Sponge City Programme (SCP). These strategies aim to manage stormwater more efficiently and mitigate the impacts of climate change. LID practices, for instance, promote infiltration and groundwater recharge, enhancing resilience to climate change-induced flooding.
Green infrastructure is another crucial component of urban stormwater management. By utilizing plants, soil, and natural systems, green infrastructure helps manage rainfall runoff, reduces flooding, and improves climate resilience. Rain gardens, for example, are designed to trap and absorb rooftop, sidewalk, and street runoff, allowing rainwater to evapotranspire or slowly filter into the ground. They also recharge underground aquifers, prevent stormwater from reaching waterways, and provide habitats for wildlife.
The Urban Street Stormwater Guide offers a vision for cities to address resilience and climate change while creating public spaces that serve social and economic needs. It emphasizes the importance of sustainable stormwater management practices, such as green infrastructure, and provides a framework for measuring the performance of streets comprehensively. Additionally, local area assessments are significant in understanding the impacts of climate change on urban hydrology, helping to determine the runoff coefficient and prepare for flood hazards.
Effective urban stormwater drainage requires a comprehensive understanding of the hydrology, geomorphology, bio-geochemistry, and ecology of stream ecosystems. By studying streambed pollution and its various forms, including chemical, physical, and biological contamination, we can develop more exhaustive monitoring and mitigation measures to conserve and effectively manage stream ecosystems.
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Natural causes
While human activity is the most common cause of water pollution, natural sources can also contaminate water.
- Floods: Floods can flush pollutants and soil into rivers and streams.
- Rain: Rainwater washes dirt into streams and rivers. This dirt can smother fish and other aquatic life and block sunlight from plants.
- Soil Erosion: Exposed earth from ploughed fields, construction sites, logging, mining, and stream banks can all result in soil entering streams.
- Bacteria: Bacteria can enter streams from combined sewers and runoff of animal waste from farms, pets, and wildlife.
- Algal Blooms: The natural process of eutrophication, where algae blooms deplete oxygen levels in water, can be accelerated by human activity and water pollution.
- Groundwater Contamination: Groundwater can be contaminated by naturally occurring arsenic, fluoride, and mercury from the Earth's crust.
- Air Deposition: Forest fires and microbial activity can cause air pollutants to settle into water bodies.
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Sewage pollution
Streams are important surface water resource systems that support diverse aquatic life forms and provide several services relevant to human needs, such as drinking water supplies. Stream pollution is caused by a wide range of contaminants entering the stream system from various natural and anthropogenic sources. Sewage pollution is one of the major contributors to stream pollution.
Sewage contains a variety of dangerous pollutants that pose risks to both human health and the environment. Untreated human sewage, for example, can harbour harmful pathogens such as salmonella, hepatitis, dysentery, and cryptosporidium. In addition, sewage can introduce high levels of nutrients, particularly nitrogen and phosphorus, into streams, leading to a process called eutrophication, which encourages the growth of algal blooms. These algal blooms can be toxic and have detrimental effects on aquatic ecosystems, contributing to the decline of biodiversity and ecosystem health.
Furthermore, sewage pollution may contain other contaminants, including heavy metals, pharmaceuticals, and personal care products, which can have toxic effects on aquatic life. The impact of sewage pollution on streams can be challenging to mitigate once it has occurred. While ecosystems may recover from acute spills, chronic pollution can cause irreversible damage to sensitive river ecosystems.
To address sewage pollution in streams, it is crucial to invest in upgrading wastewater infrastructure and expanding natural areas to prevent stormwater from rushing into sewers. Additionally, implementing innovative solutions, such as waste-free toilets and resource recovery systems, can help manage sewage pollution more effectively and protect the health of both humans and aquatic ecosystems.
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Frequently asked questions
Stream pollution is the contamination of streams by a wide range of pollutants, including fine sediments, pesticides, plastics, chemicals, and biological wastes. These pollutants can come from both natural and anthropogenic sources, such as industrial effluents and urban discharge.
Stream pollution can be caused by point sources, such as pipes or channels used for industrial or municipal wastewater discharge. It can also be caused by dispersed (nonpoint) sources, such as agricultural runoff, urban stormwater drainage, and soil erosion.
Stream pollution has detrimental effects on aquatic ecosystems and human health. It can lead to the destruction of biodiversity, eutrophication of water bodies, and contamination of the food chain. Polluted streams can also introduce toxins into food sources, causing diseases such as diarrhoea, cholera, and typhoid.
