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Links found on this page - acid cycle , acid discharge , acid run off , coastal regions , Calibrated Flood Gate Valvecalcium carbonate , CRAB , eco-system , environmentalsulfidic muds & soils

Active Lime Dosing

This is a technique that essentially copies what is happening in the tidal drains, substituting salt water management  for artificial dosing techniques and is especially useful in highly polluted acidic effluent with low pH and high levels of dissolved aluminium and iron.

                                  

Using the CRAB to manipulate pH with a blend of lime reagents.

               

                                                                                                        The pH reading is 7.93.

Key Benefits

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Instead of using salt water to flocculate metal loads and subsequently producing 'sulfidic ooze' the salt water is substituted with calcium carbonate or some suitable alkaline reagent.

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The result of using calcium carbonate is the production of calcium sulphate commonly known as gypsum and iron and aluminum hydroxides.  These by-products can then be recycled as a useful product beneficial to soil structure and at pH above 5 the metal hydroxides will rapidly absorb further heavy metals.

        Some of the reagents that can be accurately dispensed are -

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Calcium carbonate - rock form

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Calcium hydroxide - 600kg bags or 25kg bags

 

Capabilities

The process would involve making an artificial pond either by

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damming,

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weiring existing drainage systems or, by

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building a complete sump and diverting effluent water through the sump.

Accurately treating the effluent water with alkaline reagents and therefore raising the pH to 7, much of the heavy metal can be 'dropped out' in the sump, and in fact, the 'buffering' capacity can be added, in the form of excess carbonate to the water discharging from the sump.

The sump design would look something like this -

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Text Box: Active Dosing treatment point
Text Box: Sediment build up
Text Box: Weir or dam wall
Text Box: SIDE ELEVATION
Text Box: END ELEVATION
Text Box: Existing drain out 
Text Box: Existing drain in 
Text Box: PLAN
Text Box: Weir or dam with discharge pipe protruding through.
Text Box: Water discharge point PVC pipe.
Text Box: Active dosing treatment point

 

 

 

 

 

 

 

 

 

 

bulletThe question is often asked what to do with the sump once it is full.  The best possible thing to do is to monitor the depth of sediment build up and at a stage close to full capacity 95% dig another sump using the treated over burden to 'cap' the existing sump and continue with land use.
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bulletIncidentally there are examples of this process already working. 
bulletA small sediment catchment weir servicing a soft rock quarry in Northern NSW on a creek containing large loads of iron and aluminum.  This dam is now full and is growing grass and rain forest trees on top of the mass.   Had this sump been treated with calcium carbonate the mass would have remained quite stable for future use.  As it is, it runs the risk of failure and subsequent re-oxidation of contained sulfidic mass therefore once again completing the acid cycle. (see photos above)

 

 

 

Contact Information

Telephone
                                                               ACID
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          PO Box 3040
  Currumbin
          Qld 4223
 
          AUSTRALIA
 
E - mail
 
Information: acidsolutions@bigpond.com

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Last modified: 05/06/04

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