Removal of pollutants with determination of power consumption from landfill leachate wastewater using an electrocoagulation process: optimization using response surface methodology (RSM)

Abstract

Treatment of landfill leachate wastewater by electrocoagulation process using an aluminium electrode was investigated in a batch electrochemical cell reactor. Response surface methodology based on central composite design was used to optimize the operating parameters for the removal of % color and % total organic carbon (TOC) together with power consumption from landfill leachate. Effects of three important independent parameters such as current density (X 1 ), inter-electrode distance (X 2 ) and solution pH (X 3 ) of the landfill leachate sample on the % color and % TOC removal with power consumption were investigated. A quadratic model was used to predict the % color and % TOC removal with power consumption in different experimental conditions. The significance of each independent variable was calculated by analysis of variance. In order to achieve the maximum % color and % TOC removal with minimum of power consumption, the optimum conditions were about current density (X 1 )-5.25 A/dm 2 , inter-electrode distance (X 2 )-1 cm and initial solution of effluent pH (X 3 )-7.83, with the yield of color removal of 74.57%, and TOC removal of 51.75% with the power consumption of 14.80 kWh/m 3 . Electrocoagulation process could be applied to remove pollutants from industrial effluents and wastewater.

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

“…Also, the intensity of the O-H band was increased from 3451.54 to 3451.60 cm −1 . This peak shift implied the interaction of the adsorbate with the functional groups of the adsorbent [46]. Based on the above FTIR spectrum a proposed adsorption mechanism can be illiustrated in Figure 4.…”

Fluoride removal from aqueous solution onto activated carbon of Catha edulis through the adsorption treatment technology

“…In recent years, the use of inexpensive, easily available adsorbents with high carbon content and low inorganic composition have been used as potential raw material for the preparation of activated carbon. Special attention is given for locally developed adsorbents that are promising raw materials for the removal of contaminants from water and wastewater (Asaithambi et al 2018). Hence, many studies are focused on adsorbents for fluoride removal from drinking water, such as an alum manufacturing process (Nigussie et al 2007), alumina in bauxite (Lavecchia et al 2012), activated alumina (Mulugeta et al 2015), CaCl 2 -modified Crocus sativus leaves (Dehghani et al 2018), fired clay pots (Kofa et al 2017), bark of Morinda tinctoria (Amalraj and Pius 2017), bark of the Vitex negundo plant (Suneetha et al 2015), lanthanum-impregnated bauxite (Vardhan and Srimurali 2016), lapsi seed stone (Joshi et al 2012), Al-Ce hybrid adsorbent (Liu et al 2010) and iron ore (Kebede et al 2016).…”

Evaluation of the efficiency of electrocoagulation process in removing cyanide, nitrate, turbidity, and chemical oxygen demand from landfill leachate

“…At alkaline pH (pH=10) and natural pH (pH=8.3), the removal efficiency values of NO 3 were 93.91 and 60.5%, respectively. The high efficiency of NO 3 removal by the electrocoagulation process in alkaline pH, can be attributed to the reaction between the aluminum electrode and the hydroxide ions in the solution leading to insoluble aluminum hydroxide and floc formation, in which soluble nitrate can be removed by flocs through precipitation or adsorption processes (7,23). Moreover, with increasing pH of the solution, the inactive aluminum oxide on the electrodes disappears (24).…”