The influence of emulsified oil, suspended solids, Fe^(3+), Fe^(2+), cationic water clarifier and sulfate-reducing(SR) bacteria on the aggregation behavior of residual hydrophobic modified polyacrylamide in treated oily wastewater from polymer flooding was studied by fluorescence spectroscopy and dynamic light scattering.The result of I_1/I_3 showed that the polarity of hydrophobic microdomains increased, whereas the size of the hydrophobic microdomains may be decreased, where the value of I_1/I_3 represents the ratio of the intensity of peak I_1(374.0 nm) to that of peak I_3(385.0 nm) of the vibration fine structure of pyrene monomer emission in residual polymer solution. The results of the ratio of I_1 at 48 h to I_1 at 0 h(I_(1,48h)/I_(1,0h)) indicated that oil and cationic water clarifier could inhibit the aggregation to some extent, while Fe^(2+)and suspended solids were helpful for aggregation,and Fe^(3+)and SR bacteria had no significant influence on the aggregation of polymer.
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