Natural or Manmade Sources of
Heavy Metals in Water
Resource
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Background
 Water the most important natural resource that man
has exploited to sustain life
 Only 2.5% of the earth’s w...
Threats
 Heavy metals occur naturally in the environment
 Heavy metals, such as zinc, iron, or copper play an
important ...
Threat of heavy metals
 Most common source of heavy metals is volcanic activity
 Materials from such activity find way t...
Threat of heavy metals
 Mining produces toxic heavy metals.
 Mines release waste through the effluence, making it toxic....
Threat of heavy metals
 Bio solids - sewage sludge - animal waste, and
industrial waste often released into water.
 Sewa...
Control
 Use of alkaline materials to neutralize acidic mine
waters
 Process raises the pH of acidic mine drainage
 Acc...
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Natural or manmade sources of heavy metals in

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Transcripts - Natural or manmade sources of heavy metals in

  • 1. Natural or Manmade Sources of Heavy Metals in Water Resource Presented by http://payessaywriters.com/ http://payessaywriters.com/
  • 2. Background  Water the most important natural resource that man has exploited to sustain life  Only 2.5% of the earth’s water is fresh  Need to depend on the rain to meet our daily demands.  Pollution a major problem in recent times  Has caused diminishing supply of water  No organism can survive without water. http://payessaywriters.com/
  • 3. Threats  Heavy metals occur naturally in the environment  Heavy metals, such as zinc, iron, or copper play an important beneficial role in our bodies.  Lead, arsenic, or mercury, can build up in fish, potentially threatening human health after consumption  Also contaminate the environment. http://payessaywriters.com/
  • 4. Threat of heavy metals  Most common source of heavy metals is volcanic activity  Materials from such activity find way to various water bodies  Magmatic rocks from magma cooling down.  Ore minerals hidden and compact in the crust, releasing few metals into the environment.  Metals including iron ores, argite, and apatite produce mild levels of toxicity  Copper, others, are naturally occurring, found in the earth’s crust at low concentrations, hence no toxic effects.  Copper released to water bodies through decaying vegetation or copper mining activities, agricultural activities, such as the use of fertilizers. http://payessaywriters.com/
  • 5. Threat of heavy metals  Mining produces toxic heavy metals.  Mines release waste through the effluence, making it toxic.  Mining of gold deposits using a mixture of mercury releases heavy metals in environment  Acidic sulphur rich in wastewater, produced from the Acidic mine drainage drains out of most mine drainages  Contains high concentrations of sulphate, iron, and other heavy metals (Hardy, 2008, p.1).  Agricultural activities a source of heavy metals in water resources.  Heavy food demand influences use of fertilizers, pesticides for better production  Metals find way to water resources through runoff, drainage, seepage into soil http://payessaywriters.com/
  • 6. Threat of heavy metals  Bio solids - sewage sludge - animal waste, and industrial waste often released into water.  Sewage sludge contains traces of zinc and copper  Research on Ganga Basin from Bandtrinth to Narora, Asia, yielded observations of heavy metal deposition  Huge concentrations of iron, nickel, lead, cadmium, cobalt, and zinc found as one moved lower, due to the presence of many industries.  More industrialized nations more prone to effects of toxic heavy metals. http://payessaywriters.com/
  • 7. Control  Use of alkaline materials to neutralize acidic mine waters  Process raises the pH of acidic mine drainage  Accelerates the oxidation rate  Causes heavy metals to precipitate from solution as hydroxides or carbonates  Absorbents used to remove metals from contaminated water  Expensive. http://payessaywriters.com/
  • 8. Find reliable help in writing custom essays, assignments, homework, and research papers at http://payessaywriters.com/ http://payessaywriters.com/

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