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Links found on this page -    calibrated , chemicals & reagents  , CRAB , eco-systems , environmenthydrated lime , run-off

    Acid Mine Drainage

 

Actively Treating the Acid Mine Drainage problem.

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A CRAB being transported to a site.

bullet    Loading cubic metre bags with the specially designed bag cutter and hopper system.

 

 Generally Acid Mine Drainage has been treated through a chemical process using mainly lime products to neutralize acid discharge.  This photo shows the ability to treat a drain by treating the water using a mobile CRAB.

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Acid Rock Drainage is the acidic product from the oxidation of pyrites, usually associated with pyritic coals.

 

bulletAcid SolutionsPty Ltd have manufactured the CRAB  - a Calibrated Reagent Applicating Blender that can return the pH to normal levels. 

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    This photo shows the dispersing reagent from a mobile CRAB unit.

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  A pH reading of 7.9 where previously it was pH 3.4 treating 3.5 megalitres per hour.

bulletThe CRAB is unique in that it has the ability blend and calibrated different reagents and chemicals to suit any situation.

bulletMany different reagents can be calibrated and blended with the CRAB - hydrated lime plus calcium carbonate are just a few.  The CRAB will handle most powdered and liquid and rock reagents up to 100mm aggregate.

 

What is Acid Mine Drainage?

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Principally Acid Mine Drainage or AMD is contaminated water caused by mining, whether it be open cut or underground mining.

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Acid Mine Drainage is usually high in dissolved iron, aluminum and sulfuric acid.  When leaching to the surface AMD has colors varying  from yellow/orange - orange/red.

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The colours come from the iron and the smell that is associated with it comes from the sulphur.   

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It's the run off of this contaminated water that has a major impact on the environment. 

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Acid Drainage is one of the biggest environmental problems today, affecting entire eco-systems either by reducing natural inhabitants or by destroying whole areas that previously flourished with plants and animals.

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Destruction is usually in the forms of fish kills and land scalds.

How is Acid Mine Drainage formed?

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Through mining operations the natural occurring deposits of sulfidic compounds and minerals in the soils  associated with some mining practises become exposed to the oxygen.  While undisturbed they are in an anaerobic state and quite harmless.  At the commencement of mining the natural balance shifts and these minerals and sulfidic compounds oxidize and react into different oxidised products.

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It is this exposure to oxygen and water that creates a chemical reaction that filters into our waterways taking with it other harmful chemicals such as  copper, iron, aluminium, manganese, cadmium, zinc, lead, and arsenic.  pH readings around 3 or 4 are common in mining areas associated with Acid Mine Drainage.

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Acid leachate can come from inside the mine on the walls of the tunnels or from the 'tailings' left from when the ore was extracted.

The Effects of AMD.

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AMD can effect the environment by destroying the habitat in waterways - fish, crustaceans, frogs ect.  The effect on fish habitat that rely on the rivers to breed is enormous.  Acid Mine Drainage contaminates natural breeding grounds.

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AMD can contaminate the food chain by the amount of heavy metals in solution in the water.  As the prey and predator cycle continue the amount of heavy metals accumulating in each animal can affect animals higher up the chain.

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AMD can contaminate the drinking water that normally is used for water supplies in towns and cities.

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Acid Mine Drainage is a huge ongoing environmental problem today, affecting entire eco-systems either by reducing natural inhabitants or by killing whole areas that previously flourished with plants and animals.

Containments.

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Dams or ponds are useful ways of storing containments from Acid Mine Drainage, where they can be treated and subsequently cleansed.  

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They can present a major problem in flood conditions in the event of overflowing or damage to pond walls releasing major containments eg contamination of the Rhine river when a retaining dam at a gold mine in Poland released poison effluent.

 

Contact Information

Telephone
                                                               ACID
          Sales & Enquiries - 1800 11 2243
Service  - (61) 0439 38 48 84
         
Postal address
 
Acid Solutions Pty Ltd
 
          PO Box 3040
  Currumbin
          Qld 4223
 
          AUSTRALIA
 
E - mail
 
Information: acidsolutions@bigpond.com

 

Written without prejudice

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Copyright 2002-2003 Acid Solutions Pty Ltd
Last modified: 05/06/04

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