ADSORPTION PERFORMANCE OF DISSOLVED ORGANIC MATTER BY IRON-MODIFIED ACTIVATED CARBON FROM SECONDARY EFFLUENT OF WASTEWATER TREATMENT PLANTS
In this study,coal-based activated carbon(AC)was iron-modified using the immersion method.The effectiveness of iron-modified activated carbon(Fe-AC)in adsorbing dissolved organic matter(DOM)from the secondary effluent of wastewater treatment plants was investigated.EDS,XRD,and FTIR confirmed that iron was successfully loaded onto the activated carbon in the form of Fe2O3.After modification,the surface area of activated carbon increased by 29.3％.The Fe-AC exhibited good capacity for adsorbing the DOM in secondary effluent,with DOC removal efficiencies of 50.0％to 63.5％and UV254 removal efficiencies of 71.3％to 88.2％,both significantly higher than AC.The adsorption of DOM by Fe-AC was well described by a modified Freundlich isotherm.In addition,Fe-AC presented good adsorption performance for NO3-and PO43-,with removal efficiencies of 55.4％and 76.5％,respectively.The three-dimensional fluorescence spectrum and UV-visible absorption spectrum indicated that the DOM in secondary effluent is dominated by humic substances produced in microbial metabolism,and these organic components can be effectively adsorbed by Fe-AC.In conclusion,Fe-AC adsorption is an effective technology for advanced wastewater treatment.
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