Abstract
Abstract: Removal of As(V) from groundwater by a new air-injected electrocoagulation (EC) reactor using iron (Fe) ball anodes was investigated and the operating conditions were optimized. Effects of operating parameters such as initial pH (pHi: 6.5–8.5), current (i: 0.1–0.5 A), operating time (tEC: 1–3 min), size of Fe anode ball (dp: 5–10 mm), initial As(V) concentration (Co: 50–150 μg/L), air flow rate (Qair: 2–10 L/min), and column height of Fe ball (h: 2–8 cm) in the EC reactor were evaluated with a three-level factorial design viz. Box–Behnken statistical experiment design. The model program provided with responses such as effluent As(V) concentration, removal efficiency, and operating cost for the EC process. Analysis of variance for all variables had confirmed the predicted models by the experimental design within 95% confidence level (R2: 0.94, adj-R2: 0.87), which ensured a satisfactory adjustment of the quadratic model with the experimental data. The maximum removal efficiency of As(V), minimum operating cost, and lowest effluent concentration at the optimized conditions (pHi 7.2, 0.5 A, 1.2 min, 5 mm ball size, column height of 4.8 cm, and 9.9 L/min) for initial concentration of 100 μg/L were obtained as 99.2%, 0.031 $/m3, and 0.4 μg/L, respectively.
Original language | English |
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Pages (from-to) | 1177-1190 |
Number of pages | 14 |
Journal | Desalination and Water Treatment |
Volume | 56 |
Issue number | 5 |
DOIs | |
Publication status | Published - 30 Oct 2015 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2014 Balaban Desalination Publications. All rights reserved.
Keywords
- Arsenate removal
- Electrocoagulation
- Iron ball anode
- Optimization