Abstract: Disclosed is a heavy metal removal media containing ferric hydroxide having unique levels of microporosity and mesoporosity/macroporosity, and/or a specific average particle size and/or granule size. The ferric hydroxide is made by simultaneously combining in a vessel at least one iron salt and at least one hydroxide compound, and then recovering the ferric hydroxide. The ferric hydroxide made by simultaneous mixing is effective in removing heavy metals, such as arsenic, from aqueous systems.

Abstract: Disclosed is a heavy metal removal media containing ferric hydroxide having unique levels of microporosity and mesoporosity/macroporosity, and/or a specific average particle size and/or granule size. The ferric hydroxide is made by simultaneously combining in a vessel at least one iron salt and at least one hydroxide compound, and then recovering the ferric hydroxide. The ferric hydroxide made by simultaneous mixing is effective in removing heavy metals, such as arsenic, from aqueous systems.

Abstract: A media for removal of arsenic from an aqueous system comprising a mixture of: activated bauxite, aluminum trihydrate and a ferric compound selected from the group consisting of ferric hydroxide, ferric oxyhydroxide, ferric hydroxyoxide and mixtures thereof. The mixture is preferably calcined and is thereafter formed into a powder, granules or extruded particles. Preferably, the mixture prior to calcination also contains a natural or synthetic filler which has the capability of modifing the porosity of the mixture. Removal of arsenic from the aqueous system is readily accomplished by contacting the aqueous system with the media until the arsenic is substantially removed from the aqueous system. If arsenic is present in the aqueous system in the +3 valence state, the aqueous system is preferably oxidized to convert the arsenic to the +5 valence state prior to contact of the aqueous system with the media.

Abstract: Disclosed are formed composite material compositions suitable for use in the removal of heavy metals from aqueous systems, a process for preparing said composite materials and a process for the removal of heavy metals using said composite materials. Formed particulate composite material compositions are comprised of (A) at least one ion exchange material; (B) at least one activated carbon; and, optionally, (C) at least one binder material. The method for preparing said composite material compositions comprises first mixing components (A), (B) and, optionally, (C), then forming particles from said mixture. The method for removing heavy metals from aqueous systems containing one or more heavy metals comprises contacting said aqueous system with one or more of the composite materials until the heavy metals are substantially removed from the aqueous system.

Abstract: Disclosed is a method for removing arsenic from aqueous systems containing arsenic which includes contacting said aqueous system with an adsorbent material comprising (i) activated bauxite and (ii) aluminum trihydrate, until the arsenic is substantially removed from said aqueous system. The adsorbent material is prepared by the steps including (i) mixing powders of activated bauxite and aluminum trihydrate in the presence of water to form granules; (ii) drying said granules; and (iii) calcining said dried granules.