A new Fe-C porous filter material from dredged sediment: preparation, characterization, and its application

Abstract

A new Fe-C porous lter material was prepared with dredged sediment of river as raw material. The orthogonal test L 9 (3 4 ) and component ratio experiment of raw material were conducted to investigate the optimum technological condition. Further, the lter obtained was characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), energy dispersive X-ray spectroscope (EDS), and X-ray diffraction (XRD). Results showed that the optimal technological condition was sludge: straw: starch: iron powder: foam: iron powder 74.5∶10∶7.5∶3∶5, preheating temperature 280 ℃, preheating 15 min, sintering temperature 1080 ℃, and sintering 11 min. The BET surface area of the lter was 3.32 m 2 g − 1 , and average pore size was 10.05 nm. Phase composition mainly included SiO 2 , Fe 3 O 4 , Fe 2 O 3 and muscovite (KAl 2 (Si 3 Al)O 10 (OH) 2 ). Average e uent concentrations of total phosphorus (TP), total organic carbon (TOC), and total nitrogen (TN) of the bio lter system lled with the lter obtained were decreased to 0.08, 3.43, and 3.76 mg L − 1 , separately, at hydraulic retention time 4 h. Thus, the lter prepared with dredged sediment of rive as raw material is an alternative material for polluted river water puri cation.