types of surface water pollution

Surface waters are the natural water resources of the Earth. They are found on the exterior of the Earth's crust and include:
Oceans
Rivers
Lakes
These waters can become polluted in a number of ways, and this is called surface water pollution.

Industrial and agricultural work involves the use of many different chemicals that can run-off into water and pollute it.

• Metals and solvents from industrial work can pollute rivers and lakes. These are poisonous to many forms of aquatic life and may slow their development, make them infertile or even result in death.
• Pesticides are used in farming to control weeds, insects and fungi. Run-offs of these pesticides can cause water pollution and poison aquatic life. Subsequently, birds, humans and other animals may be poisoned if they eat infected fish.
• Petroleum is another form of chemical pollutant that usually contaminates water through oil spills when a ship ruptures. Oil spills usually have only a localised affect on wildlife but can spread for miles. The oil can cause the death of many fish and stick to the feathers of seabirds causing them to lose the ability to fly.

Some pollutants do not dissolve in water as their molecules are too big to mix between the water molecules. This material is called particulate matter and can often be a cause of water pollution.
The suspended particles eventually settle and cause a thick silt at the bottom. This is harmful to marine life that lives on the floor of rivers or lakes.
Biodegradable substances are often suspended in water and can cause problems by increasing the amount of anaerobic microorganisms present.
Toxic chemicals suspended in water can be harmful to the development and survival of aquatic life.

Causes of water pollution in Marine Dumping.

Dumping of litter in the sea can cause huge problems. Litter items such as 6-pack ring packaging can get caught in marine animals and may result in death. Different items take different lengths of time to degrade in water:

• Cardboard – Takes 2 weeks to degrade.
• Newspaper – Takes 6 weeks to degrade.
• Photodegradable packaging – Takes 6 weeks to degrade.
• Foam – Takes 50 years to degrade.
• Styrofoam – Takes 80 years to degrade.
• Aluminium – Takes 200 years to degrade.
• Plastic packaging – Takes 400 years to degrade.
• Glass – It takes so long to degrade that we don’t know the exact time.
  
  
  
  
  
  
  

GroundWater pullotion

A lot of the Earth's water is found underground in soil or under rock structures called aquifers. Humans often use aquifers as a means to obtain drinking water, and build wells to access it. When this water becomes polluted it is called groundwater pollution. Groundwater pollution is often caused by pesticide contamination from the soil, this can infect our drinking water and cause huge problems

Microbiological water pollution is usually a natural form of water pollution caused by microorganisms.
Many types of microorganisms live in water and cause fish, land animals and humans to become ill. Microorganisms such as:
Bacteria
Viruses
Protozoa
Serious diseases such as cholera come from microorganisms that live in water. These diseases usually affect the health of people in poorer countries, as they do not have the facilities to treat polluted water.

Causes of oil pollution

Oceans are polluted by oil on a daily basis from oil spills, routine shipping, run-offs and dumping.

• Oil spills make up about 12% of the oil that enters the ocean. The rest come from shipping travel, drains and dumping.
• An oil spill from a tanker is a severe problem because there is such a huge quantity of oil being spilt into one place.
• Oil spills cause a very localised problem but can be catastrophic to local marine wildlife such as fish, birds and sea otters.
• Oil cannot dissolve in water and forms a thick sludge in the water. This suffocates fish, gets caught in the feathers of marine birds stopping them from flying and blocks light from photosynthetic aquatic plants.

Dangers of water pollution!

Virtually all types of water pollution are harmful to the health of humans and animals. Water pollution may not damage our health immediately but can be harmful after long term exposure. Different forms of pollutants affect the health of animals in different ways:
Heavy metals from industrial processes can accumulate in nearby lakes and rivers. These are toxic to marine life such as fish and shellfish, and subsequently to the humans who eat them. Heavy metals can slow development; result in birth defects and some are carcinogenic.
Industrial waste often contains many toxic compounds that damage the health of aquatic animals and those who eat them. Some of the toxins in industrial waste may only have a mild effect whereas other can be fatal. They can cause immune suppression, reproductive failure or acute poisoning.
Microbial pollutants from sewage often result in infectious diseases that infect aquatic life and terrestrial life through drinking water. Microbial water pollution is a major problem in the developing world, with diseases such as cholera and typhoid fever being the primary cause of infant mortality.
Organic matter and nutrients causes an increase in aerobic algae and depletes oxygen from the water column. This causes the suffocation of fish and other aquatic organisms.
Sulfate particles from acid rain can cause harm the health of marine life in the rivers and lakes it contaminates, and can result in mortality.
Suspended particles in freshwater reduces the quality of drinking water for humans and the aquatic environment for marine life. Suspended particles can often reduce the amount of sunlight penetrating the water, disrupting the growth of photosynthetic plants and micro-organisms.

Causes of water pollution in Sewage and Wastewater.

• Domestic households, industrial and agricultural practices produce wastewater that can cause pollution of many lakes and rivers.
• Sewage is the term used for wastewater that often contains faeces, urine and laundry waste.
• There are billions of people on Earth, so treating sewage is a big priority.
• Sewage disposal is a major problem in developing countries as many people in these areas don’t have access to sanitary conditions and clean water.
• Untreated sewage water in such areas can contaminate the environment and cause diseases such as diarrhoea.
• Sewage in developed countries is carried away from the home quickly and hygienically through sewage pipes.
• Sewage is treated in water treatment plants and the waste is often disposed into the sea.
• Sewage is mainly biodegradable and most of it is broken down in the environment.
• In developed countries, sewage often causes problems when people flush chemical and pharmaceutical substances down the toilet. When people are ill, sewage often carries harmful viruses and bacteria into the environment causing health problems.
  
  
  
  
  
  
  

Microorganisms that live in water feed on biodegradable substances. When too much biodegradable material is added to water, the number of microorganisms increase and use up the available oxygen. This is called oxygen depletion.
When oxygen levels in the water are depleted, relatively harmless aerobic microorganisms die and anaerobic microorganisms begin to thrive. Some anaerobic microorganisms are harmful to people, animals and the environment, as they produce harmful toxins such as ammonia and sulfides.

Causes of water pollution in Industrial waste!!


Industry is a huge source of water pollution, it produces pollutants that are extremely harmful to people and the environment.
Many industrial facilities use freshwater to carry away waste from the plant and into rivers, lakes and oceans.
Pollutants from industrial sources include:

• Asbestos – This pollutant is a serious health hazard and carcinogenic. Asbestos fibres can be inhaled and cause illnesses such as asbestosis, mesothelioma, lung cancer, intestinal cancer and liver cancer.
• Lead – This is a metallic element and can cause health and environmental problems. It is a non-biodegradable substance so is hard to clean up once the environment is contaminated. Lead is harmful to the health of many animals, including humans, as it can inhibit the action of bodily enzymes.
• Mercury - This is a metallic element and can cause health and environmental problems. It is a non-biodegradable substance so is hard to clean up once the environment is contaminated. Mercury is also harmful to animal health as it can cause illness through mercury poisoning.
• Nitrates – The increased use of fertilisers means that nitrates are more often being washed from the soil and into rivers and lakes. This can cause eutrophication, which can be very problematic to marine environments.
• Phosphates - The increased use of fertilisers means that phosphates are more often being washed from the soil and into rivers and lakes. This can cause eutrophication, which can be very problematic to marine environments.
• Sulphur – This is a non-metallic substance that is harmful for marine life.
• Oils – Oil does not dissolve in water, instead it forms a thick layer on the water surface. This can stop marine plants receiving enough light for photosynthesis. It is also harmful for fish and marine birds.
• Petrochemicals – This is formed from gas or petrol and can be toxic to marine life.

Nutrients are essential for plant growth and development. Many nutrients are found in wastewater and fertilisers, and these can cause excess weed and algae growth if large concentrations end up in water.
This can contaminate drinking water and clog filters.
This can be damaging to other aquatic organisms as the algae use up the oxygen in the water, leaving none for the surrounding marine life.

Preventing Water Pollution!

What Can You Do?

If you want to help keep our waters clean, there are many things you can do to help. You can prevent water pollution of nearby rivers and lakes as well as groundwater and drinking water by following some simple guidelines in your everyday life.
Conserve water by turning off the tap when running water is not necessary. This helps prevent water shortages and reduces the amount f contaminated water that needs treatment.
Be careful about what you throw down your sink or toilet. Don't throw paints, oils or other forms of litter down the drain.
Use environmentally household products, such as washing powder, household cleaning agents and toiletries.
Take great care not to overuse pesticides and fertilisers. This will prevent runoffs of the material into nearby water sources.
By having more plants in your garden you are preventing fertiliser, pesticides and contaminated water from running off into nearby water sources.
Don't throw litter into rivers, lakes or oceans. Help clean up any litter you see on beaches or in rivers and lakes, make sure it is safe to collect the litter and put it in a nearby dustbin.