Arsenite removal from groundwater in a batch electrocoagulation process: Optimization through response surface methodology

Erhan Demirbas*, Mehmet Kobya, Mehmet Salim Oncel, Emrah Şık, Aysegul Yagmur Goren

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In this study, influences of seven process variables such as initial pH (pH i ), applied current (i), operating time (t EC ), initial As(III) concentration (C o ), diameter of Fe ball anode (d p ), column height in the electrocoagulation (EC) reactor (h) and airflow rate (Q air ) for removal of As(III) from groundwater by a new air-fed fixed-bed EC reactor were evaluated with a response surface methodology (RSM). The proposed quadratic model fitted very well with the experimental data for the responses. The removal efficiencies and operating costs were determined to be 99% and 0.01 $/m 3 at the optimum operating conditions (a pH i of 8.5, 0.05 A, 4.94 min, d p of 9.24 mm, h of 7.49 cm, Q air of 9.98 L/min for 50 µg/L). This study clearly showed that the RSM in the EC process was a very suitable method to optimize the operating conditions at the target value of effluent As(III) concentration (10 µg/L) while keeping the operating cost to minimal and maximize the removal efficiency.

Original languageEnglish
Pages (from-to)775-785
Number of pages11
JournalSeparation Science and Technology
Volume54
Issue number5
DOIs
Publication statusPublished - 24 Mar 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018, © 2018 Taylor & Francis.

Funding

The authors would like to thank TUBITAK for the financial support of this work (contract no: 111Y103).

FundersFunder number
TUBITAK111Y103

    Keywords

    • Arsenite removal
    • electrocoagulation
    • Fe ball anode
    • groundwater
    • optimization

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