TREATING ACIDITY IN COAL PIT LAKES USING SEWAGE AND ...

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Treating acidity in pit lakes using sewage and greenwaste Figure 4.2. CCP Project Lease pit lakes and surrounding towns. Collinsville has a semi-arid tropical climate with a rainfall regime that falls into a transition between sub-humid and semi-arid. The climate is dominated by a moderately low, highly episodic and unreliable summer rainfall (708 mm/annum) and a very high evaporation rate (1,860 mm/annum) (Commonwealth of Australia Bureau of Meteorology, 09/02/2005; Davies & Willcocks, 1992) (Figure 4.3). Figure 4.3. Mean temperature and rainfall climate of Collinsville (Commonwealth of Australia Bureau of Meteorology, 09/02/2005). 16
17 McCullough, Lund and May (2008) The geology of the region is of highly weathered hard rocks with soils of very low organic carbon content. Surrounding vegetation is predominantly Eucalyptus and Acacia spp. dominated open woodland with an annual grass understory. There are some 20 pit lakes in the CCP lease, all of which are acidic with high concentrations of dissolved solutes. All of these lakes are of extremely low pH (ca. pH 2) and contain high concentrations of dissolved solutes (electrical conductivity = 9–19 mS cm -1 ). One of these acid pit lakes, Garrick Area East (GAE), is the focus of this study due to its proximity to the Collinsville waste water treatment plant and green waste dump (
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8.2.5 Pit lakes 69 McCullough, Lund
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(a). (b). (c). (d). Depth (m) Depth
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(a). (b). (c). (d). Depth (m) Depth
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8.3.4 Metal/metalloid concentration
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Concentration (mg L -1) 93 McCullou
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8.4 Discussion 95 McCullough, Lund
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9 Conclusions 99 McCullough, Lund a
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11 References 103 McCullough, Lund
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TREATING ACIDITY IN COAL PIT LAKES USING SEWAGE AND ...

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