Removal of zinc based on a screw manufacturing plant wastewater by fluidized-bed homogeneous granulation process

doi:10.1016/j.jclepro.2019.05.192

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Periodical Articles > Item 310902800/32582

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Title:	Removal of zinc based on a screw manufacturing plant wastewater by fluidized-bed homogeneous granulation process
Authors:	Udomkitthaweewat, Nutnapong Anotai, Jin Choi, Angelo Earvin Sy Lu, Ming Chun
Contributors:	Chia Nan Univ Pharm & Sci, Dept Environm Resources Management King Mongkuts Univ Technol Thonburi, Dept Environm Engn, Fac Engn King Mongkuts Univ Technol Thonburi, Dept Environm Engn, Ctr Excellence Hazardous Subst Management Natl Res Ctr Disaster Free & Safe Ocean City
Keywords:	Fluidized-bed homogeneous granulation process Hydrozincite Nucleation Ferric ions Chloride Zinc crystallization
Date:	2019-09
Issue Date:	2020-07-29 13:50:47 (UTC+8)
Publisher:	ELSEVIER SCI LTD
Abstract:	Wastewater derived from screw producing manufacturing plants contains high zinc concentrations that needs to be treated prior to its discharge. Crystallization through the fluidized-bed reactor has been an effective technology for the removal of heavy metals. In this research, the removal of zinc from a simulated wastewater was investigated by a fluidized-bed reactor. The properties of the granules were characterized by utilizing the X-ray diffraction, energy dispersive spectrometer and scanning electron microscope. A comparison of the fluidized-bed reactor setting was conducted to compare the processes of fluidized-bed homogeneous granulation and fluidized-bed granulation. Results showed that the fluidized-bed homogeneous granulation outperformed fluidized-bed granulation in terms of removal and granulation efficiencies. The essential variables for analysis include chloride concentration (0-7,000 mg/L), pH (6.9-7.5), carbonate to zinc molar ratio (1-2.5) and ferric ion concentration (0-150 mg/L) in the fluidized-bed homogeneous granulation process. The results indicated that the ideal conditions for hydrozincite granulation were at a carbonate to zinc molar ratio of 1.2 and pH 7.2. The elemental composition analysis of the hydrozincite revealed zinc contents of the following: (1) absence of chloride (63.71 wt% zinc), (2) presence of chloride (63.08 wt% zinc) and (3) presence of ferric ions (52.62 wt% zinc). The inclusion of chloride and ferric ions in the system interfered with zinc precipitation and granulation. Furthermore, the hydrozincite granule predominantly reached a diameter of 149 mu m (with chloride) and 42 mu m (with ferric ions). (C) 2019 Elsevier Ltd. All rights reserved.
Relation:	Journal of Cleaner Production, v.230, p.1276-1286
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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