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WATER
TREATMENT
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
Limestone
Dispensing - Australia
 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
Toxic
Metal Reduction - Australia
 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
Drinking
Water - Australia
 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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INFO
Treatment
for Water Re-use - Indonesia
 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
Wastewater/Odour
Control - Australia
 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
Stormwater
Turbidity - Indonesia
 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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INFO
Reduction
in Treatment Costs - USA
 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
Reduced
Infrastructure Requirements - Australia
 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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