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Removal of chromium (VI) dissolved in water by intermittent foam separation was implemented with cetyl trimethy-ammonium bromide
as surfactant. The influence of various factors on removal efficiency was systematically studied. The removal efficiency has
a maximum value near pH 4.0; thus, most experiments were carried out at pH 4.0. The orthogonal experiment was conducted to
confirm the optimal operating parameters. The orthogonal experimental results show that when the liquid feed concentration
is 10 mg/L, the pH value of feed solution is 4.00, air flow rates 0.9 L/min, surfactant dosage is 300 mg/L, the maximum removal
efficiency of chromium (VI) reaches 97.80%, and condense multiple reaches 1 711. The kinetic test indicates that the foam
separation of chromium is a first-order process. The equivalent rate constant calculated from the slope is 0.406 4, and the
equivalent rate equation is obtained. 相似文献
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