Tohdite recovery from water by fluidized-bed homogeneous granulation process

doi:10.5004/dwt.2017.21540

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Chna Project > Item 310902800/31627

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/31627

Title:	Tohdite recovery from water by fluidized-bed homogeneous granulation process
Authors:	Vilando, Anabella C. Caparanga, Alvin R. Huang, Yao-Hui Lu, Ming-Chun
Contributors:	Adamson Univ, Coll Engn, Dept Chem Engn Mapua Univ, Sch Chem Engn & Chem Natl Cheng Kung Univ, Dept Chem Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	Tohdite Fluidized-bed Granulation Supersaturation
Date:	2017-11
Issue Date:	2018-11-30 15:50:45 (UTC+8)
Publisher:	Desalination Publ
Abstract:	Fluidized-bed homogeneous granulation process (FBHGP) is an advanced process that can remove heavy metals in wastewaters by forming densified granules without using seed material. This investigation studies the aluminum recovery from water by FBHGP. The effluent pH (pH(e)) was an essential factor in determining the efficacy of FBHGP in terms of Al removal (%) and granulation ratio (GR, %). The Al removal % that was achieved by the growth of aluminum oxide hydrate nuclei at 300 mg.L-1 with an influent molar ratio of [H2O2] in/[Al3+](in) = 2.50 was 99.12% at pH(e) = 9.0 +/- 0.2. However, the GR of 96.47% that transformed the crystalline phase of granular pellets from aluminum hydroxide to aluminum oxide hydrate (Al10O15H2O-Tohdite) was confirmed by the X-ray diffraction analysis. An effective FBHG process ran under a supersaturation was close to the metastable region, as discussed by the evaluations of hydraulic conditions and supersolubility activities in the effluent. To conclude, a practical way of recovering aluminum from aqueous solution into a granule form and non-toxic compound of aluminum oxide hydrate was done.
Relation:	Desalination and Water Treatment, v.96, pp.224-230
Appears in Collections:	[Dept. of Environmental Resources Management] Chna Project

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