An investigation on the new operational parameter effective in Cr(VI) removal efficiency: A study on electrocoagulation by alternating pulse current
An investigation on the new operational parameter effective in Cr(VI) removal efficiency: A study on electrocoagulation by alternating pulse current
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DOI：
10.1016/j.jhazmat.2011.03.010
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发表时间：
2011-06-15
影响因子：
13.6
通讯作者：
Rofouei, Mohammad Kazem
中科院分区：
文献类型：
--
作者：
Keshmirizadeh, Elham;Yousefi, Somayeh;Rofouei, Mohammad Kazem
在实验室规模上研究了铝/铁电极电絮凝法去除铬的性能。研究了初始pH、电流密度（CD）、反应时间、初始浓度（50、100、500、1000 mg/L）、溶液电导率、电能消耗（EEC）和电路类型等操作参数对Cr（VI）去除率的影响。交流脉冲电流（APC）用于防止电极的无源性或极化。为获得更高（99%）的Cr（VI）去除率，优化了重要的运行参数：EEC范围：4-58 kWh/m(3)废水，CD: 56-222 A/m(2)，运行时间：20-110 min， pH 3-9 (PHoptimum 5)，电压：15-25 V。NaCl, KCl， PAC（聚氯化铝）。采用NaNO3作为支撑电解质。NaCl和KCl处理EC各方面表现最好。PAC和NaNO3没有相同的结果（应用电导率优于文献）。这项工作的结果与最近的研究结果相当。“直流”（DC）和“APC”（APC）的去除率相同，但使用“APC”时，水回收率(0.92 m（3)/m(3)废水）显著，浊度为1 NTU。“APC”让我们的实验团队惊叹不已。(C) 2011 Elsevier B.V.版权所有
The performance of an electrocoagulation (EC) process with aluminum/iron electrodes for removal of chromium on laboratory scale was studied. The effect of operational parameters such as initial pH, current density (CD), reaction time, initial concentrations (50, 100, 500, 1000 mg/L), solution conductivity, electrical energy consumption (EEC) and type of circuit were studied in an attempt to reach higher Cr(VI) removal efficiency. Alternating pulse current (APC) was used to prevent the passivity or polarization of electrodes. Important operating parameters were optimized to access higher (99%) Cr(VI) removal efficiency as follows: EEC range: 4-58 kWh/m(3) wastewater, CD: 56-222 A/m(2), operating time: 20-110 min, pH 3-9 (PHoptimum 5), voltage: 15-25 V. NaCl, KCl, PAC (poly aluminum chloride). NaNO3 were used as supporting electrolytes. NaCl as well as KCl handled the EC with the best performance in every aspect: however. PAC and NaNO3 did not have the same results (Applied conductivity is better than literature). The results of this work are comparable with those of recent studies. Equal removal efficiency was obtained in "direct current" (DC) and (APC): however, when "APC" was used, water recovery (0.92 m(3)/m(3) wastewater) was significant and the turbidity was 1 NTU. "APC" amazed our experimental team. (C) 2011 Elsevier B.V. All rights reserved.