RESUMO
Under high temperatures in summer and autumn, the effects of FeCl3, PFC, and PAFC on co-manganese oxides filter media for removing ammonium and manganese from surface water were investigated. The results showed that FeCl3 can be hydrolyzed easily, thus reducing the pH of the water and the residual iron in the water were not conducive to the removal of ammonium and manganese. Transforming the coagulant FeCl3 into PFC can effectively recover the removal effect of ammonium and manganese. After being pre-treated by PAFC, removal of ammonium and manganese during the filtering operation remained stable and excellent. Simultaneously, the structural characteristics of the filter material were analyzed. Different coagulants caused different changes of shape of filter media. As FeCl3 is a coagulant, the slow increase in specific surface area is not beneficial to removal of ammonium and manganese. Additionally, the results of FTIR spectra indicated that coagulants have different influences on the group of Fe-OH bonds of filter media. This study provides a theoretical basis for the study of the effects of water quality factors on the removal of ammonium and manganese from surface water.
