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In this study, aerobic granular sludge was utilized as an
effective biosorbent to remove Zn2+ from the aqueous solution. The
results showed that the initial pH, contact time and Zn2+ concentration
affected the biosorption process significantly. Typically, the adsorption capacity
of Zn2+ by aerobic granular sludge increased with increasing pH in
the ranges of 5.0-7.0 and decreased with increasing of pH in the ranges of 7.0-9.0,
which indicated that pH at 7.0 was optimal choice for the Zn2+ adsorption
by the aerobic granular sludge. The maximum removal of Zn2+ at pH
7.0 was found to be 131.47 mg g-1 at initial Zn2+ ion
concentration of 120 mg L-1 by the aerobic granular sludge. In addition,
the adsorption ability of two kind of anaerobic granular sludge from different
reaction stage at one reactor for Zn2+ remove was compared. It was
founded that the anaerobic granular sludge from the end of aerobic stage had
better adsorption ability than that from the end of anaerobic stage, which could
be attributed to be the species and quantity of microbial in the aerobic granular
sludge.
