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Links found on this page - acid sulphate soils , artificial sumping , run off , hydrated lime , calcium hydroxide  , CRAB Specifications , blending reagents

      

 

CRAB - Calibrated Reagent Applicating Blender

 

The CRAB is a technically advanced active dosing system meeting strict calibration requirements and should be treated as a scientific instrument.

 

Overview

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CRAB specifications can be seen on the CRAB Specifications page.

 

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The CRAB is a multi purpose reagent dosing system specifically designed for treating low pH effluent water associated with acid mine drainage and neutralizing acid produced from disturbed acid sulphate soils. 

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The CRAB is unique in that it uses coarse aggregate limestone (pictured) rock as the mixing agent and carrier for other alkaline products such as calcium hydroxide.

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The two part hopper or holding box contains reagent material to be blended for release.  Selected reagent material is ground with water and calcium carbonate rock (limestone) according to the calibration - as each site is analyzed according to the treatment required.

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                                                         NEW PHOTO  2 part hopper shown. 

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Different multiple reagents can be accurately blended to suit treatment sites.

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The sump collects water with finely ground product and discharges mixed water and reagent directly into the target area through suitable pressurized delivery systems.

bulletThe CRAB. has been designed to provide dosing of calcium limestone plus hydrated lime into bodies of water or watercourses, roads or spoils  as means of controlling Acid Sulfate runoff .

 

 

 

 

 

 

 

bulletThe CRAB can calibrate chemicals and reagents - see below.

bulletThe CRAB can use extremely alkaline substances - see below.

bulletDepending on the nature of the Acid Sulphate problem there is a machine size to suit - see below.

 

Key Benefits

bulletUsing the C.R.A.B. is a cost effective alternative. 

The CRAB is specifically environmentally friendly, requiring very low power requirements, 6KW, to carry out the full process.  Suitable power supplies include -

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Mains power,

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Portable generator - diesel or petrol,

Claims

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Efficient crushing & grinding of product of 10 - 100mm plus rock to 20microns or less.  The rock is the medium for the CRAB and provide useful crushed product for example calcium limestone or rock phosphate depending on desired application.

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Accurate calibration of product into surrounding waterways or onto spoils.

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Very low power requirements.

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Improve dissolved oxygen levels.

The CRAB can accurately calibrate and disperse

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dry powders,

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granular compounds,

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rock product up to 100mm,

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liquids, and

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if needed a blend of any of the above if required.

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Reagents are more effective due to the unique blending and mixing process.

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Oxygenation of water is a natural part of this process.

Chemicals & Reagents used

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bulletThe CRAB is unique in that it can use any powdered or rock reagent acid or alkaline such reagents as -

Calcium Carbonate - rock form,

Calcium hydroxide - 600kg bags or 25kg handy-bags

Magnesium oxide - powder form.

Aluminium Sulphate

Loading 500kg bags    click on thumbnail for larger size photo.

 

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The high neutralizing factor meant that there was a need for exact calibration to eliminate the possibility of overcorrection of pH status.

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The use of highly alkaline substance in the initial treatment of acidic water means that the acidity is immediately neutralized by the alkalinity.  Very simply until a desired balance is achieved, eg pH  6.5, high alkaline reagent discharge is complete and final neutral pH correction is achieved using calcium carbonate.

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The use of highly alkaline neutralizing agents reduces the tendency for alkaline reagent armouring by soluble metals.

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All dosing operation would be accompanied by laboratory reports and recommendations made.

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All personnel using the CRAB would need to undergo training in the art of pH manipulation and have been certified by Acid Solutions Pty Ltd in the use of the machine.

 

Calibrated Flow

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In order to ensure absolute accuracy with calibration of reagent,  a number of influencing factors must be known -

  1. Belt speed.

  2. Auger speed.

  3. Water flow through the machine

  4. Laboratory results.

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All of the above lead to a Mixture Ratio.

 

Liquid Reagent Introduction System

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The use of liquid reagents such as sodium hydroxide require extreme caution and exact calibration.  This issue has been effectively addressed by fitting a second container that houses the reagent.  The reagent is then introduced at necessary intervals via the calibrated pumps and injected into the CRAB ensuring complete mixing. 

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The Liquid Reagent Introduction System can be manufactured to relate to job size.

Fail Safe Shut Down

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The CRAB is designed to shut down via countdown timer, pH overcorrection.

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The Fail Safe System contained include -

  1. Earth leakage on electrical system.

  2. Low water level - sump.

  3. System overflow.

  4. Extreme alkalinity limit.

 

 

Government and Agri-business have become aware of decreasing water quality on coastal strips below 5 metres AHD.

The problem on the coastal strips has been identified by acid run off due to oxidation of acid sulphate soils.

 

 

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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