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

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Treating acidity in pit lakes using sewage and greenwaste improvements in pH, with greenwaste and sewage combined treatments providing the greatest improvement, followed by sewage and then greenwaste alone. Adding more organic material, with the exception of greenwaste only, improved the pH reached at day 180. For example, GS100 produced a similar pH and water quality to S200. Improvements in pH were associated with reductions in S, sulfate, ORP, DO, Al, Cd, Co, Cr, Ni, Zn, Cu, Pb, and Fe concentrations, which are consistent with sulfate reduction processes. The heterogeneous nature of the greenwaste appears reflected in the variability between replicates which was larger than for other treatments especially at the 200g level. ; Interestingly, S100 was associated with higher Se, TFN, TFP, Mg and Ca concentrations compared to all other treatments. The addition of more organic matter (200g) to the treatments, resulted in lower EC, despite potentially adding more solutes (see Table 7.4). Figure 7.2. PCA of day 180 microcosms physico-chemical data. The amount of variability explained by each axis is shown as a percentage. Lines indicate eigenvectors, the direction of the line indicates the relationship to a PC axis and the length of the line indicates its relative importance (longer lines are more important). 48
49 McCullough, Lund and May (2008) Day 180, total nutrients increased from below detection (
Page 1: March 2008 TREATING ACIDITY IN COAL
Page 5 and 6: Treating acidity in pit lakes using
Page 9: Treating acidity in pit lakes using
Page 23 and 24: 6 Collinsville microcosms - Experim
Page 25 and 26: 23 McCullough, Lund and May (2008)
Page 37: 35 McCullough, Lund and May (2008)
Page 67 and 68: 8.2.1 Risk Assessment 65 McCullough
Page 71 and 72: 8.2.5 Pit lakes 69 McCullough, Lund
Page 77 and 78: (a). (b). (c). (d). Depth (m) Depth
Page 79 and 80: (a). (b). (c). (d). Depth (m) Depth
Page 81 and 82: 8.3.4 Metal/metalloid concentration
Page 95 and 96: Concentration (mg L -1) 93 McCullou
Page 97 and 98: 8.4 Discussion 95 McCullough, Lund
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9 Conclusions 99 McCullough, Lund a
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101 McCullough, Lund and May (2008)
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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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