夏秋季混凝剂对复合锰氧化膜去除地表水中氨氮和锰的影响

Effects of Different Coagulants on Co-manganese Oxides Filter Media for Removing Ammonium and Manganese from Surface Water in Summer and Autumn

在夏秋季较高温条件下,采用3种混凝剂(Fe Cl3、PFC和PAFC)考察其对复合锰氧化膜中试滤柱去除地表水中氨氮和锰的影响.结果表明,Fe Cl3易水解从而降低水体p H且残留大量铁于水体中均不利于氨氮和锰的去除,改变混凝剂Fe Cl3为PFC,可有效恢复滤柱去除氨氮和锰的能力.经PAFC处理后水体中氨氮和锰在滤柱运行期间去除效果稳定且良好.分析滤料结构特性发现,不同混凝剂对滤料的形貌会产生不同的影响.在以Fe Cl3作为混凝剂时,滤料比表面积上升相对缓慢,不利于氨氮和锰的去除. FTIR图谱结果表明,不同混凝剂运行条件下对滤料Fe-OH键的存在有不同影响.本研究为地表水中氨氮和锰去除过程中水质因素的影响研究提供了一定的理论基础.

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 pretreated 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.