A liquid that has dissolved or entrained environmentally harmful substances that may then enter the environment. Leachate exists on its own, usually as a result of natural decomposition. Groundwater pollution is associated with it.
Introduction. The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentrations. Examples of heavy metals include mercury (Hg), cadmium (Cd), arsenic (As), chromium (Cr), thallium (Tl), and lead (Pb).  Air pollution-emissions into atmosphere2. Ground Water pollution-emissions into water Air Pollution – Emissions into Atmosphere Landfills create a clear and obvious threat to human health as well as a threat to our environment from the hazardous contaminated air emissions emitted from the landfill biodegradation. 10 most extreme places on Earth. Landfill leachate is liquid that moves through or drains from a dump or organized trash collection site. Some leachate exists on its own, usually as a result of natural decomposition. liquids and chemicals that have been discarded also contribute. The biggest source of leachate in most places is rainwater, though.  Effects of waste and poor waste disposal. Imagine we all throw garbage, junk and rubbish away anyhow. Imagine there was no authority to supervise waste management activities from all the sources mentioned earlier. Imagine we all just sent our rubbish to the landfill, or just dumped them in a nearby river. Waste that end up in water bodies negatively change the chemical composition of the water. Technically, this is called water pollution. This will affect all ecosystems existing in the water. It can also cause harm to animals that drink from such polluted water. Leachate is a widely used term in the environmental sciences where it has the specific meaning of a liquid that has dissolved or entrained environmentally harmful substances that may then enter the environment. It is most commonly used in the context of land-filling of putrescible or industrial waste. The primary criterion for design of the leachate system is that all leachate be collected and removed from the landfill at a rate sufficient to prevent an unacceptable hydraulic head occurring at any point over the lining system. The key environmental problem we face as a result of landfills is groundwater pollution from leachates (the liquid that drains or 'leaches' from a landfill). Although they intended to protect human beings from toxins, due to natural deterioration the protective barriers only delay the inevitable. Landfills create a clear and obvious threat to human health as well as a threat to our environment from the hazardous contaminated air emissions emitted from the landfill biodegradation. Groundwater contamination may result from leakage of very small amounts of leachate. TCE is a carcinogen typically found in landfill leachate. It would take less than 4 drops of TCE mixed with the water in an average swimming pool (20,000 gallons) to render the water undrinkable. Landfills create a clear and obvious threat to human health as well as a threat to our environment from the hazardous contaminated air emissions emitted from the landfill biodegradation. A leachate is any liquid that, in the course of passing through matter, extracts soluble or suspended solids, or any other component of the material through which it has passed. The primary criterion for design of the leachate system is that all leachate be collected and removed from the landfill at a rate sufficient to prevent an unacceptable hydraulic head occurring at any point over the lining system. Leachate from a landfill varies widely in composition depending on the age of the landfill and the type of waste that it contains. It usually contains both dissolved and suspended material. The generation of leachate is caused principally by precipitation percolating through waste deposited in a landfill. The primary criterion for design of the leachate system is that all leachate be collected and removed from the landfill at a rate sufficient to prevent an unacceptable hydraulic head occurring at any point over the lining system.
http://www.lenntech.com/processes/heavy/heavy-metals/heavy-metals.htm http://www.wegreen-usa.org/landfill-problems.html http://www.wisegeek.org/what-is-landfill-leachate.htm http://www.eschooltoday.com/waste-recycling/effects-of-poor-waste-management.html https://en.wikipedia.org/wiki/Leachate http://www.wegreen-usa.org/landfill-problems.html http://www.wegreen-usa.org/landfill-problems.html https://en.wikipedia.org/wiki/Leachate https://en.wikipedia.org/wiki/Leachate
Define the term leachate. Where does it originate and what environmental problems are associated with it?