Remediation of COD and color from textile wastewater using dual stage electrocoagulation process

Abstract

The study has been done to investigate the effects of the current density on COD removal, color removal and electrode consumption on simulated textile wastewater using malachite green dye in the dual stage electrocoagulation process with settler. The results indicated that double stage electrocoagulation with settler is efficient at current density 165 A/m 2 and able to attain 92.60% COD removal and over 93.11% color removal. The most suitable current density for process is 135 A/m 2 in term of COD and color removal efficiency giving removal of 90.93 and 92.18%, respectively. analysis of variance (ANOVA) reveals that COD removal consistently changes for different COD concentrations among first and second stage electrocoagulation as well as settler. However, Tukey's test shows significant (P < 0.001) removal of COD. In case of color, ANOVA reveals significantly different color concentration among first and second stage electrocoagulation as well as settler. Moreover, Tukey's test also shows significant (P < 0.001) removal of color. In case of electrode consumption, t test revealed significant electrode consumption. Correlating the removal of COD concentration (mg/L) and electrode weight loss (mg) by Pearson correlation analysis for 1st reactor and 2nd reactor, it revealed a significant and positive correlation between COD removal and electrode weight loss (r = 0.98, P < 0.001) indicating that as removal in COD concentration increases, electrode weight loss increases.

Electrocoagulation technique for removing Organic and Inorganic pollutants (COD) from the various industrial effluents: An overview

“…The electrode consumption from the first reactor was greater than the second reactor while increasing the CD. The effective CD from this study was 135 A/m 2 [18,51]. The tannery industrial effluent was treated with EC technique with Fe electrodes under batch mode operation.…”

“…The process has been demonstrated to be an effective and dependable technology that provides an environmentally friendly method for reducing a wide range of pollutants [17]. Electrocoagulation and electrocoagulation/flotation processes are most effective at removing inorganic contaminants and pathogens from water and wastewater treatment projects [18].…”

Lead removal efficiency of various natural adsorbents (Moringa oleifera, Prosopis juliflora, peanut shell) from textile wastewater

“…the capacity of adsorbent. For the analysis of adsorption process, various isotherms were tested, such as Langmuir, Freundlich and Temkin isotherms [12,13].…”

“…Most of them have some limitations such as high sludge generation in precipitation, coagulation/flocculation and ionic exchange methods; huge pressure require in reverse osmosis; high cost of treatment in electrochemical operations, as short half-life of ozone in ozonation, formation of byproduct in photochemical degradation. These methods also require large amount of energy and reagents besides disposal problem of produced sludge and toxic by-products [11][12][13]. Adsorption is one of the best and effective methods used for removal of heavy metal from wastewater.…”

Chemical Oxygen Demand and Color Removal from Oil Refinery Wastewater using Chitosan Bio-adsorbent

“…The level of pollution in wastewater is reflected by the intensity of its color [21] If the concentration of COD is high, it can react with chlorine in the final water treatment process to produce trihalomethane (THM), which is a toxic compound that can have negative health effects, such as cancer [22]. Various techniques, such as nanofiltration [23] and electrocoagulation [24], have been evaluated for removing COD and color. However, this study focuses on the use of the bio-adsorbent chitosan to eliminate COD and color from oil refinery wastewater.…”