Treatment of textile wastewater using a novel electrocoagulation reactor design

doi:10.30955/gnj.002519

Abstract

<p>This study explored the best-operating conditions for a novel electrocoagulation (EC) reactor with the rotating anode for textile wastewater treatment. The influence of operating parameters like inter-electrode distance (IED), current density (CD), temperature, pH, operating time (RT), and rotation speed on the removal efficiency of the contaminant was studied. A comparative study was done using conventional model with static electrodes in two phases under same textile wastewater The findings revealed that the optimal conditions for textile wastewater treatment were attained at RT = 10 min, CD = 4 mA/cm2, rotation speed = 150 rpm, temperature = 25oC, IED = 1cm, and pH = 4.57. The removal efficiencies of colour, biological oxygen demand (BOD), turbidity, chemical oxygen demand (COD), and total suspended solid (TSS) were 98.50%, 95.55%, 96%, 98% and 97.10% within the first 10 min of the reaction. The results of the experiment reveal that the newly designed reactor incorporated with cathode rings and rotated anode impellers provide a superior treatment efficiency within a short reaction time. The novel EC reactor with a rotating anode significantly enhanced textile wastewater treatment compared to the conventional model. The values of adsorption and passivation resistance validated the pollutants removal rate.</p>

Highlights

IntroductionElectrocoagulation (EC) process involves in-situ coagulant formation with sacrificial anode dissolution
The main EC operation of the textile wastewater was performed three different times to validate the performance of the application using the optimal conditions (CD = 4 mA/cm2, RT = 10 minutes, rotational speed = 150 rpm, pH = 4. 57, temperature = 25oC, and de = 1cm)
The performance of the EC reactor was evaluated in terms of the levels of chemical oxygen demand (COD), total suspended solid (TSS), color, turbidity, biological oxygen demand (BOD), O & G, TDS, DO, phenols, sulfate, phosphate, nitrates and aluminum

Summary

Introduction

Electrocoagulation (EC) process involves in-situ coagulant formation with sacrificial anode dissolution. The anode is prepared using iron or aluminium (Al) (Chen, 2004). The metal ions interact to generate insoluble OH− ions. The generated insoluble hydroxides adsorb the contaminants from the solution either by electrostatic attraction or complexation before the coagulation (Dalvand et al, 2011). Lessening of the electrodes internal resistance drop (IR-drop) is one of the most essentials towards reducing the total cost of EC operation to enhance the current performance by enhancing the state of

Objectives

Results

Conclusion