287257.fig.005a
(a)
287257.fig.005b
(b)
287257.fig.005c
(c)
Figure 5: Micrographs, 8000X, of precipitates obtained by manganese oxidation by KMnO4 at pH 7.0: (a) MnSO4 solution; (b) effluent A1; (c) effluent A2.