Removal of nickel by homogeneous granulation in a fluidized-bed reactor

doi:10.1016/j.chemosphere.2016.08.081

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Periodical Articles > Item 310902800/30922

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Title:	Removal of nickel by homogeneous granulation in a fluidized-bed reactor
Authors:	Ballesteros, Florencio C. Salcedo, Angel Frances S. Vilando, Anabella C. Huang, Yao-Hui Lu, Ming-Chun
Contributors:	Univ Philippines, Coll Engn, Environm Engn Grad Program Adamson Univ, Dept Chem Engn Mapua Inst Technol, Sch Chem Engn & Chem, Chem Engn Grad Programs Natl Cheng Kung Univ, Dept Chem Engn Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Keywords:	Nickel carbonate Nickel carbonate hydroxide Solubility Granulation ratio Hydraulic condition ion
Date:	2016-12
Issue Date:	2018-01-18 11:37:59 (UTC+8)
Publisher:	Pergamon-Elsevier Science Ltd
Abstract:	Heavy metal removal is a significant task that protects our water resources. Fluidized-bed homogeneous granulation process (FBHGP) was used to treat nickel containing wastewaters by recovering nickel in the form of nickel carbonate hydroxide granules with low moisture content rather than soft sludge. This study investigated nickel removal and recovery through HFBGP by determining the effects of varying influent nickel concentrations, [CO32-: Ni2+] molar ratios, and pH of the precipitant. This was conducted in a continuous process using a laboratory scale fluidized-bed reactor that determined the effects driven by supersaturation. The best operating conditions that resulted in a 98.8% nickel removal and 97.8% granulation efficiency were 200 mg L-1 influent nickel concentration, 2.0 M R of [CO32-: Ni2+], and 10.7 pH of precipitant. Based on SEM analysis, the granules formed have sizes between 0.50 mm and 0.15 mm. EDS results showed that the atomic percentages of nickel carbon, and hydrogen were similar to 50%, similar to 9-12%, and similar to 35% respectively, representing the nickel carbonate compound. The XRD results showed the low symmetry of the granules formed that confirmed the characteristics of nullaginite mineral of Ni-2(CO3)(OH)(2). (C) 2016 Elsevier Ltd. All rights reserved.
Relation:	Chemosphere, v.164, pp.59-67
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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