Chromium removal from industrial effluent by electrocoagulation: Operating cost and kinetic analysis Service Unavailable

This article reports the removal of chromium by electrocoagulation (EC) from metal complex dye (MCD) industrial effluent in a batch reactor using iron electrodes. The paper evaluates the application of EC process in assessing the impact of process parameters such as current density (CD), electrode distance (ED), pH, and supporting electrolyte (NaCl) concentration (Cs) for efficient removal of chromium from MCD effluent. The EC process showed, removal percentage ۹۹.۶۴ %, at the initial pH= ۵.۸۳, CD = ۸۹.۴۵ A/m۲, ED= ۰.۷ cm, and operating time of ۵۰ minutes, are the optimal operating parameters for the treatment of MCD effluent. It was also noticed that the removal of chromium is appreciably enhanced for acidic pH values. It was observed that the removal of chromium follows the ۱st order reaction by kinetic analysis of EC method. As CD raised from ۱۷.۸۹ to ۸۹.۴۵ A/m۲. The rate constant (k) was enhanced from ۰.۰۱۳ to ۰.۱۰۹ min-۱, as a result of the presence of more quantity of iron flocs throughout EC. Analysis of sludge was carried out using FESEM- EDX, which confirmed the presence of chromium, and iron hydroxide in sludge. The present work confirms that EC is an efficient process for chromium removal from MCD effluent with a calculated operating cost of ۰.۲۰۷ US/m۳ and energy consumption of ۲.۴۹۹ kWh/m۳.This article reports the removal of chromium by electrocoagulation (EC) from metal complex dye (MCD) industrial effluent in a batch reactor using iron electrodes. The paper evaluates the application of EC process in assessing the impact of process parameters such as current density (CD), electrode distance (ED), pH, and supporting electrolyte (NaCl) concentration (Cs) for efficient removal of chromium from MCD effluent. The EC process showed, removal percentage ۹۹.۶۴ %, at the initial pH= ۵.۸۳, CD = ۸۹.۴۵ A/m۲, ED= ۰.۷ cm, and operating time of ۵۰ minutes, are the optimal operating parameters for the treatment of MCD effluent. It was also noticed that the removal of chromium is appreciably enhanced for acidic pH values. It was observed that the removal of chromium follows the ۱st order reaction by kinetic analysis of EC method. As CD raised from ۱۷.۸۹ to ۸۹.۴۵ A/m۲. The rate constant (k) was enhanced from ۰.۰۱۳ to ۰.۱۰۹ min-۱, as a result of the presence of more quantity of iron flocs throughout EC. Analysis of sludge was carried out using FESEM- EDX, which confirmed the presence of chromium, and iron hydroxide in sludge. The present work confirms that EC is an efficient process for chromium removal from MCD effluent with a calculated operating cost of ۰.۲۰۷ US/m۳ and energy consumption of ۲.۴۹۹ kWh/m۳.

Keywords:

Electrocoagulation , iron electrode , metal complex dye (MCD) effluent , Chromium removal , kinetic study