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

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Treating acidity in pit lakes using sewage and greenwaste Figure 6.5. Day 86 concentrations of a). major, and b). minor, analytes for each treatment level. Error bars indicate single standard errors of the mean. 32 a). b).
33 McCullough, Lund and May (2008) A Principal Components Analysis (PCA) indicated that addition of organic matter appeared to increase the variability of water chemistry parameters over that of the control (Figure 6.6). There also appeared to be synergistic effects on variability with the combined GS treatment producing the most varied response between replicates. Addition of green waste moved the water chemistry primarily along the first principal component axis, addition of sewage separated along the second principal component axis. After 86 days, addition of sewage was correlated with increases in dissolved concentrations of the heavy metals cadmium, copper, lead and zinc; and ammonia. Addition of sewage was correlated with decreases in iron, chromium, sulfate and electrical conductivity. Addition of green waste was correlated with increases in pH and with decreases in dissolved oxygen, redox, aluminium, nickel, sulfate and selenium. Nevertheless, although more variable, water chemistry correlations with green waste and sewage were very similar to green waste. Figure 6.6. PCA of day 86 microcosm core solute concentrations and physico-chemistry. Vectors indicate variables contributing │>0.25│ to an eigenvector. Ellipses represent range of variation within treatment levels.
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Page 67 and 68: 8.2.1 Risk Assessment 65 McCullough
Page 71 and 72: 8.2.5 Pit lakes 69 McCullough, Lund
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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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