期刊
JOURNAL OF WATER REUSE AND DESALINATION
卷 7, 期 3, 页码 288-297出版社
IWA PUBLISHING
DOI: 10.2166/wrd.2016.010
关键词
current density; defluorination; electrocoagulation; Fe/C/Al; FGD wastewater; nickel removal
资金
- National Natural Science Foundation of China [21677052]
- Major Science and Technology Program for the Industry-Academia Research Collaborative Innovation [201605122301117, 201604010043]
- Guangdong Province Science and Technology Project [2016B090918104, 2013B090200016, 2015B020215007, 2015B020235009, 2016B020240005]
- Joint Fund of Guangdong Province [U1401235]
- State Key Laboratory of Pulp and Paper Engineering [2016C03]
- Electric Power Research Institute of Guangdong Grid Co. [KGD2013-0501]
- Zhanjiang of Guangdong Energy Co. [ZY-KJ-YX-2016X085F]
Large amounts of anions and heavy metals coexist in flue gas desulfurization (FGD) wastewater originating from coal-fired power plants, which cause serious environmental pollution. Electrocoagulation (EC) with Fe/C/Al hybrid electrodes was investigated for the separation of fluoride and nickel ions from a FGD wastewater. The study mainly focused on the technology parameters including anode electrode type, time, inter-electrode distance (5-40 mm), current density (1.88-6.25 mA/cm(2)) and initial pH (4-10). The results showed that favorable nickel and fluoride removal were obtained by increasing the time and current density, but this led to an increase in energy consumption. Eighty-six percent of fluoride and 98% of Ni(II) were removed by conducting the Fe/C/Al EC with a current density of 5.00 mA/cm(2) and inter-electrode distance of 5 mm at pH 4 for 25 min and energy consumption was 1.33 kWh/m(3). Concomitant pollutants also achieved excellent treatment efficiency. The Hg, Mn, Pb, Cd, Cu, SS and chemical oxygen demand were reduced by 90%, 89%, 92%, 88%, 98%, 99.9% and 89%, respectively, which met stringent environmental regulations.
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