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. 2014 Jul 22;9(7):e102688. doi: 10.1371/journal.pone.0102688

Figure 1. Changes of sludge pH, concentrations of Fe2+ and total Fe, and sludge CST during the sewage sludge bioleaching.

Figure 1

(▪ CK1, ○CK2, △A.t+A.f).