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


Demirbas E., Kobya M., Oncel M. S. , Sik E., Goren A. Y.

SEPARATION SCIENCE AND TECHNOLOGY, vol.54, no.5, pp.775-785, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 5
  • Publication Date: 2019
  • Doi Number: 10.1080/01496395.2018.1521834
  • Journal Name: SEPARATION SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.775-785
  • Keywords: Arsenite removal, groundwater, electrocoagulation, Fe ball anode, optimization, DRINKING-WATER, WASTE-WATER, ARSENATE, COAGULATION, FE, WASTEWATERS, EFFICIENCY, FLUORIDE, MODEL
  • Istanbul Technical University Affiliated: Yes

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 mu g/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 mu g/L) while keeping the operating cost to minimal and maximize the removal efficiency.