water pollution?

Hope the below helps you:

Water pollution

Water pollution is created by dumping waste materials into steams, rivers and the sea. The pollutants include solid waste , liquid effluents ,and energy in the form of waste heat .

Sources of water pollution　
　
1)Domestic waste :　　
Waste water from household, including waste from flushed lavatories is often discharged into the sea without any treatment .

2)Industrial waste:

Factories discharge poisonous chemical waste products directly into rivers and streams.　
　
3)Oil spillage:

This happens when ships deliberately or accidentally release oil at sea. The ecological consequences of a large oil spill can be extremely serious.

Effects of water pollution
1) Waste materials which go into rivers and the sea may promote the growth of alage. Alage may use all the oxygen . The excess growth of alage is also the cause of red tides.

2)Because fish and other marine life cannot live in Hong Kong's dirty water, fishing boats have to travel further to find fish. As a result, we have to pay more for our seafood.

3) If marine plants die, the fish which feed on them die. If the fish die, the birds which feed on them will also die. The birds which feed on them will also die. The whole food chain is broken and we will have less food to eat.

4) Poisonous chemical waste which goes into the sea can affect fish. Human may be poisoned by eating these fish.

5) People who drink polluted water may catch cholera or typhoid.

6) People swimming in dirty water may develop ear or skin infections or other diseases.

7) Crude oil leaked into the sea from tankers can destroy beaches, marine life and birds.

The solutions - 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 lives.

- Conserve water by turning off the tap when running water is not necessary. This helps prevent water shortages and reduces the amount of 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.

- Make sure that you 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.

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-overfishing
The world's population keeps growing and more food in needed. More fish are caught.(the cause the water pollution)
There are fewer fish in the sea, so fishery production decreases.
(the effect the water pollution)
Rapid population growth causes a high demand in land.(the cause the water pollution)
Filling materials may be toxic.(the effect the water pollution)
-sea transport
Fast economic development demands more sea transport and offshore oil drilling activities(the cause the water pollution)
Oil slicks strick on the bodies of animals, making them too heavy to float. (the effect the water pollution)
-dumping sewage and waste
A lot of industrial sewage, domestic sewage and agricalture waste have been dumped into the oceans and seas, causing serious water pollution.(the cause the water pollution)
People cannot swim because of lower quality of beaches.(the effect the water pollution)
the solutions the water pollution:
-Pass laws and legislation
-Collect and treat sewage in sewage treatment works
-Introduce sewage charge
-Set up water control zone
Set up marine parks and marine reserves
restrict reclamation

1) Cause of water pollution
--People throw rubbish into the rivers and seas.
--Polluted water flow out from farms,factories.
--Oil flow out from the ships when accidents happened.
--industries - eg, paper making ind. they need lots of water for making the paper to look more plain & clean , when water is released to river ~ pollution results.
--people throw rubbish into sea , for convienience or low education level.

2) Effect of us:
--We will get ill and even die if we drink polluted water.
--Rivers and seas will polluted.Living things in the water will die.If we eat these marine produucts,we will get poison.
--Aquatic organisms living in contaminated water would take in the toxic pollutants, the health of the human beings will be adversely affected if they eat the toxicant seafood.
--Many beaches are polluted with solid wastes which means a loss of recreational resource.

3) Solution
--gov impose heavy penalty to the illegal ind. eg imprisonment & $$$$
--more education need to be provided to citizens via 透過 mass media such as tv, newspaper, radio programmes


http://home.netvigator.com/~taich/water_pollution.htm
http://skw.hkcampus.net/~skw-eric/htmle/water.htm
http://www.qc.edu.hk/it-school/homepage/s12253/WaterPollution.html

2007-01-01 21:10:10 補充：
3) solution and prevention‧Domestic Water Treatment --> Multi-step process that removes: --solids (organics) --> by settling, skimming, and filtering --dissolved constituents --> by oxidation, chemical treatments --disinfection - chlorine

2007-01-01 21:11:32 補充：
continue above ideas...‧what to do with the sludge? --burn sludge at sea: At high enough temperatures can break down most toxins. --use as fertilizer (if free of toxins) --waste water reclamation/recycling

2007-01-01 21:12:07 補充：
continue above ideas...‧Preventing Oil Slicks accidents‧Preventing Oil Spills http://www.ust.hk/~webpepa/pepa/lecture_notes/Pollutions/water.htm