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N <br /> F <br /> Final Original H2O, <br /> pH pH percent Final Original H2O, <br /> 4.2 6.6 ------Pellets 1.75 inches 16.0 pH pH percent <br /> 1.9 9.6 7.3 6.6 _ _ Pellets 1.75 inches __ 9.2 <br /> 4.4.3 5.7 Sand tailings 3inches _ 36 <br /> r 1.8 5.7 Sand tailings 15 inches 10.4 6.8 5.7 -_Sewage sludge 2 inches - 30.4 <br /> 5.7 18.3 <br /> 1.7 13.8 5.9 7.0 Composite tailings 15 inches 18.1 <br /> 3.8 5.7 Sewage sludge_2 inches _ 36.7 <br /> 5.4 7.0 Composite tailings 3 inches 18.8 <br /> Rocks and sand <br /> Rocks and sand <br /> FIGURE 3. - Effect of a buried sewage sludge layer of FIGURE 4. - Effect of a buried sewage sludge layer of <br /> 16-3/4-inch depth on the oxidation of tail- 4-3/4-inch depth on the oxidation of tail- <br /> ing sulfides. ing sulfides. <br />