Brian Barton
Water and soil pollution are pressing issues that jeopardise human health and the environment. Water, a universal solvent, readily dissolves and mixes with toxic substances, making it vulnerable to pollution. Point source pollution, such as industrial waste and sewage treatment plants, and diffuse pollution, like farming and fossil fuel power plants, are key contributors. Soil, a vital carbon store and nutrient source, faces threats from macro and microplastics, deforestation, pesticides, over-fertilisation, and heavy metals. These pollutants carry adverse health effects, with over 60% of pollution-related deaths linked to cardiovascular disease. Addressing water and soil pollution is essential to safeguard human well-being and ecosystems.
Main Sources of Water and Soil Pollution
| Characteristics | Values |
|---|---|
| Water Pollution Sources | Sewage and wastewater treatment, farming, fossil fuel power plants, factories, towns, and natural sources |
| Soil Pollution Sources | Macro- and microplastics, deforestation, pesticides, overfertilization, heavy metals, tyre-wear particles, synthetic carpets and clothing |
| Water Pollutants | Bacteria, viruses, parasites, fertilisers, pesticides, pharmaceuticals, nitrates, phosphates, plastics, faecal waste, radioactive substances |
| Soil Health Impact | Soil is the second-largest active carbon store, providing water storage, biodiversity, and nutrients. Soil pollution can lead to poor soil quality and adverse health effects. |
| Water Health Impact | Water pollution causes diseases like diarrhoea, cholera, dysentery, typhoid, and poliomyelitis, killing over 500,000 people annually. It also impacts the global economy, stalling economic growth and exacerbating poverty. |
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What You'll Learn
Industrial activities and farming
Industrial activities and certain farming practices are significant contributors to water and soil pollution.
Industrial Activities
Industrial activities, particularly mining operations, play a crucial role in economic development but often have detrimental environmental consequences, including soil and water pollution. Mining activities introduce heavy metals such as arsenic, cadmium, lead, mercury, and zinc into the soil, contaminating water sources and posing risks to vegetation, wildlife, and human health. These toxic substances accumulate in the soil over time, even in small amounts, and can reach high concentrations depending on environmental factors and the degradability of the contaminant. Wind, precipitation, and surface water bodies can further spread these contaminants, impacting both soil and water quality.
Farming
Farming practices, including crop production, livestock, and aquaculture, significantly influence water pollution. Farms contribute to water pollution by discharging agrochemicals, organic matter, drug residues, sediments, and saline drainage into water bodies. The use of pesticides, fertilizers, and manure in farming can lead to increased levels of nitrogen and phosphorus in water sources, stimulating algal blooms that create hypoxic conditions harmful to aquatic life. Additionally, bacteria and nutrients from livestock manure can contaminate drinking water supplies and affect recreational water activities.
Farming is also linked to soil pollution, particularly through the runoff of pesticides, fertilizers, and manure, which can contaminate soil with high concentrations of nutrients, bacteria, and other pollutants. Soil erosion caused by improper farming practices can further degrade soil quality and harm aquatic ecosystems.
Combined Effects
Both industrial and farming activities contribute to "diffuse pollution," where pollutants are released into the air and eventually fall back to land and water. This form of pollution is one of the main sources of water contamination, along with point-source pollution from sewage and wastewater treatment.
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Sewage and waste water treatment
Sewage and wastewater treatment is a complex process that aims to remove impurities from wastewater or sewage before it reaches natural bodies of water or aquifers. The main sources of water pollution are sewage treatment plants, farming, and fossil fuel power plants. Sewage treatment plants are considered ""point sources" of pollution, treating wastewater from residential and industrial establishments.
The process of sewage and wastewater treatment can be divided into three phases: primary, secondary, and tertiary. During the primary treatment phase, solid waste is removed through processes such as sand filtration. Blackwater, which comes from toilets and contains human waste, is treated separately from greywater, which is generated from laundry, dishwashing, and bathing.
The secondary treatment phase involves bacterial decomposition. This step targets suspended and dissolved organic materials, pathogenic organisms (bacteria, viruses, and protozoa), and complex organic materials. Enhanced biological phosphorus removal is a process where specific bacteria store phosphate in their tissue, resulting in biosolids with high fertilizer value. Nitrogen can be removed using nitrifying bacteria, and lagooning is another method for removing nutrients and waste.
The tertiary phase focuses on nutrient removal and further filtration. This stage addresses the presence of nitrogen and phosphorus, which can disrupt aquatic ecosystems and cause algae blooms and excessive weed growth. Disinfection, the final step, destroys any remaining pathogens.
While sewage treatment helps manage water pollution, it is essential to recognize that untreated sewage and wastewater can have detrimental effects on the environment, health, and the economy. The UN estimates that over 80% of the world's sewage reaches seas and rivers without treatment, contributing to plastic pollution and the release of toxic chemicals.
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Plastic pollution
Plastic waste is a significant source of water pollution, with an estimated 19-23 million tonnes of plastic leaking into aquatic ecosystems every year. Much of this waste comes from land, with major rivers acting as conveyor belts, carrying plastic waste from inland areas to the sea. Once at sea, plastic waste is transported by ocean currents around the world. This waste breaks down into microplastics, which have been found in every corner of the globe, from Mount Everest to the Mariana Trench. These microplastics have also been detected in municipal drinking water systems and the air we breathe, and are present in human blood, lungs, and faeces. The health impacts of microplastics on humans are still being investigated, but they have been found to have harmful effects on wildlife, with millions of animals killed by plastics every year.
Addressing plastic pollution
The plastic pollution crisis cannot be solved solely through recycling; instead, a systemic transformation towards a circular economy is needed. Some governments have taken steps to limit or ban the use of single-use plastic bags, and global efforts, such as the Global Assessment of Soil Pollution, have been initiated to address the issue. However, the throw-away culture associated with disposable plastic products continues to pose a significant challenge to mitigating plastic pollution.
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Chemical dumping
Water Pollution
The chemical industry has long been associated with water pollution, as chemical waste streams from factories and manufacturing processes are released into water bodies. While regulations and preventive measures have improved, historically, many rivers and surface waters were contaminated by the dumping of chemical waste.
One of the main issues with chemical dumping is the pollution of groundwater, which is water found underground that can seep into important water sources such as lakes and rivers. Industrial sites, construction sites, and factories produce or use toxic chemicals that can be exposed to rainwater, leading to chemical-laden water washing into the soil and water sources. This type of pollution is known as "point source pollution" when it comes from a single source, such as a factory or wastewater treatment plant, and "diffuse pollution" when it comes from widespread sources, such as farming activities.
Improperly managed chemical waste, chemical spills, and leaks can also contaminate water streams. Human error, negligence, and outdated technology contribute to this problem. Large-scale growth and a lack of investment in pollution control equipment can also lead to a disregard for pollution, with industries prioritizing economic growth over environmental concerns.
Additionally, the transportation and storage of oil and its derivatives are subject to leakage, which can pollute water resources. The UN estimates that over 80% of the world's sewage, filled with chemicals and waste, ends up in seas and rivers untreated.
Soil Pollution
Health and Environmental Impact
The release of chemicals into water bodies can lead to eutrophication, where excess nutrients cause algae blooms that reduce oxygen levels and harm aquatic life. Chemical pollution in water can also lead to acute and long-term health problems for humans, including genetic defects, diseases, headaches, and nausea. According to the World Health Organization (WHO), polluted water is water that has become toxic and unusable, causing diseases such as diarrhea, cholera, dysentery, typhoid, and poliomyelitis, which kill more than 500,000 people worldwide annually.
Economic Impact
Deteriorating water quality due to chemical dumping has economic implications as well. The World Bank has warned that declining water quality stalls economic growth and exacerbates poverty in many countries. When the biological demand for oxygen in water increases due to pollution, the GDP of affected regions can decrease by a third.
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Overfertilization
Excess phosphorus and nitrogen from fertilizers cause uncontrolled growth of algae, leading to algal blooms. In normal conditions, algae produce toxins in small amounts to protect themselves from being eaten by small animals. However, due to overfertilization, algal blooms are occurring with increased frequency today. These blooms can be poisonous to various sea organisms, such as fish and clams, and if they enter the food chain, they can also be ingested by humans. There have been numerous reported cases of people dying after consuming poisoned shellfish.
The process of eutrophication, caused by excess nutrients in the water, leads to the depletion of oxygen levels in aquatic environments. This creates hypoxic conditions, which can cause stress to aquatic life. If oxygen depletion continues, anoxic conditions can occur, where no aquatic life can survive. Human activities have significantly increased the number of hypoxic areas (dead zones) along shallow coasts and estuaries.
In addition to water pollution, overfertilization can also contribute to soil pollution. Organic fertilizers, such as sewage sludge, can contain beneficial plant nutrients but are also a source of toxic metals such as lead, cadmium, nickel, and mercury. Extended use of biosolids or sewage sludge can cause the accumulation of heavy metals in the soil, which can then pollute surface water bodies through runoff and sediments. While these heavy metals tend to be restricted to the topsoil layers, they can still have detrimental effects on the environment and potentially enter the food chain.
The use of inorganic fertilizers in conventional farming practices can also have negative consequences. While this approach may appear more profitable in the short term, the long-term benefits are questionable when considering the hidden environmental and health costs. Soil erosion, pollution, and societal impacts are some of the indirect costs associated with inorganic farming practices. On the other hand, organic fertilizers offer sustainability advantages from both economic and environmental perspectives.
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Frequently asked questions
Water pollution is caused by a variety of sources, including:
- Sewage and wastewater treatment
- Farming and livestock operations, which contribute fertilizers, pesticides, and animal waste
- Fossil fuel power plants, which release pollutants into the air that fall back to the ground and water
- Plastic pollution, including from fishing boats, tankers, and cargo shipping
- Chemical dumping
Soils can be polluted by a range of natural and human-made sources, including:
- Macro- and microplastics
- Deforestation
- Pesticides
- Overfertilization
- Heavy metals
- Nanoplastics
- Tyre-wear particles
- Particles from synthetic carpets and clothing
Water pollution has a significant impact on both human health and the environment. Polluted water can cause diseases such as diarrhoea, cholera, dysentery, typhoid, and poliomyelitis, which kill more than 500,000 people worldwide each year. It also damages the global economy, with the World Bank President warning that deteriorating water quality is stalling economic growth and exacerbating poverty.
Soil pollution has been linked to various health issues, particularly cardiovascular disease, which accounts for more than 60% of pollution-related deaths. Soil is also essential for human health as it provides nutrients and acts as a natural filter to remove contaminants from water. Additionally, soil supports biodiversity and ecosystems, which are vital for agriculture and food production.
