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Fig. 3. Effect of physicochemical conditions on cobalt speciation (mg kg–1 total solids [TS]) in paper mill (Eerbeek) (A) and distillery (Nedalco) (B) granules. Intact granules: (a), (b), and (c), effect of pH value 6, 7, and 8, respectively; (d) and (e), effect of 1 mM Ni addition at time t0 and t0 + 2 d, respectively; (f), effect of 1 mM Fe addition at time t0 + 2 d. Modified granules: (a), (b), and (c), effect of EDTA addition 1, 10, and 50 mM, respectively; (d), effect of glutaraldehyde treatment; (e) and (f), effect of temperature exposure to 74 and 55°C, respectively. From left to right, bars represent the following fractions: exchangeable, carbonates, organic matter + sulfides, and residual.
