Anaerobic granular sludge adsorbed more Zn and Cu than other two sludges.
Hydrophilic EPS of anaerobic granular sludge adsorbed more Zn and Cu than HPO-A.
Freundlich model for hydrophilic EPS adsorption while Langmuir equation for HPO-A EPS.
Amides 2 group was essential for heavy metals adsorption of anaerobic granular sludge.