 CASE
STUDIES
Earth Systems' success in resolving water treatment issues is well
evidenced by the following case studies.
 Limestone
Dispensing - Australia
Toxic
Metal Reduction - Australia
Drinking
Water - Australia
Treatment
for Water Re-use - Indonesia
Wastewater/Odour
Control - Australia
Stormwater
Turbidity - Indonesia
Reduction
in Treatment Costs - USA
Reduced
Infrastructure Requirements - Australia
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| Limestone
Dispensing - Australia |
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Our client required a means
of grinding low-cost limestone aggregate (<40 mm) to
create and dispense a fine (<500 micron) slurry. In
response to this need, Earth Systems conducted field trials
of a pilot HALT (Hydro Active Limestone Treatment) System
-an extension of our own Neutra-Mill Technology. The HALT
System is a low-cost method for addressing long term treatment
issues including areas affected by acid sulphate soils,
abandoned mine sites and acid rain, without the problems
typically associated with anoxic limestone drains or open
limestone drains. |
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INFO |
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| Toxic
Metal Reduction - Australia |
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An abandoned gold mine with
a copper-rich pit lake required rehabilitation. The site
was remote and no infrastructure was available. A portable
Multi-Purpose Neutra-Mill was transported to the site,
using a conventional vehicle and trailer, and the pit
lake treated to reduce copper levels. The treated water
satisfied requirements for discharge to a nearby creek
flowing through a national park. |
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INFO |
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| Drinking
Water - Australia |
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A single portable Turbidity
Mill is used as a coagulation/flocculation system for
the drinking water of five separate towns in central Victoria,
Australia. Significant reductions in capital requirements
and operating costs were achieved. The portability of
the system also provides managers of the water supply
assets with much greater flexibility in their operations.
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| Treatment
for Water Re-use - Indonesia |
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Acidic stormwater collection
ponds at a coal loading facility in Indonesia are treated
with a Multi Purpose Neutra-Mill to correct pH. The treated
water is re-used for dust suppression within the loading
facility, reducing the need for additional clean water
to be brought on to site. |
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INFO |
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| Wastewater/Odour
Control - Australia |
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Acidic leachate from a landfill
was emitting offensive and toxic hydrogen sulphide odours
and attracting complaints from residents and the attention
of the local environmental protection authority. The water
was treated using a portable Multi Purpose Neutra-Mill
to raise the pH to 10.5 within 48 hours. Suspended solids,
including bacteria were settled within the impoundments
and the treated water was suitable for re-use at a nearby
sand mine. |
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INFO |
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| Stormwater
Turbidity - Indonesia |
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A portable Turbidity Mill
is used at a large coal mine in the tropics to reduce
the turbidity in collected stormwater. Following treatment
the stormwater is either discharged offsite or reused
onsite. The unit is easily transported between the various
water bodies requiring treatment. Treatment is conducted
using alum (aluminium sulphate hydrate) and hydrated lime.
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| Reduction
in Treatment Costs - USA |
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The tailings pond at a heap
leach gold mine in the US was undergoing regular pH adjustment
using liquid sodium hydroxide. A trial at the site demonstrated
potential annual reagent cost savings of US$400,000 if
the existing sodium hydroxide system was replaced by a
portable Multi Purpose Neutra-Mill dispensing hydrated
lime. |
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INFO |
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| Reduced
Infrastructure Requirements - Australia |
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A base metal mine on 'care
and maintenance' needed to raise the pH of a 180 million
litre tailings dam. A portable Multi Purpose Neutra-Mill
was placed directly in the tailings dam and dispensed
180 tonnes of hydrated lime to raise the pH from 2.8 to
8.0. Treatment was conducted by the 2 site staff in conjunction
with their daily care and maintenance tasks. |
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INFO |
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