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 (X1), inter-electrode distance (X2) and solution pH (X3) 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 (X1)—5.25 A/dm2, inter-electrode distance (X2)—1 cm and initial solution of effluent pH (X3)—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/m3. Electrocoagulation process could be applied to remove pollutants from industrial effluents and wastewater.
Highlights
Increases in world population and new patterns of consumption have resulted in huge production of wastes that are usually discarded in sanitary landfills, since this is relatively simple and inexpensive (Azni 2009)
The electrodes were connected to a direct current (DC) power supply (APLAB Ltd; Model L1606) with aid of crocodile clips for supplying constant current density, varying from 1.05 to 6.25 A/dm2. 3 g/L NaCl was added in the solution to improve the electrical conductivity of the solution and a magnetic stirrer was used at 500 rpm to increase the probability of particle collision to improve the efficiency of the electrocoagulation process
This study investigated the removal of % color and % total organic carbon (TOC) using electrocoagulation process in a real landfill leachate wastewater
Summary
Increases in world population and new patterns of consumption have resulted in huge production of wastes that are usually discarded in sanitary landfills, since this is relatively simple and inexpensive (Azni 2009). Applied Water Science (2018) 8:69 as operating cost, transfer of one phase to another, lower pollutant removal efficiency and decreasing the process performance. It is essential to design and develop an economic and effective treatment method for removing pollutants from landfill leachate wastewater. Electrochemical processes have shown high effectiveness in eliminating persistent pollutants from landfill leachate wastewater (Ricordel and Djelal 2014; Panizza et al 2010) and have some advantages such as energy efficiency, versatility and cost-effectiveness (Juttner et al 2000). Electrocoagulation process appears to be the most effective substitution for the conventional coagulation and flotation process as it can deal with pollutants with a variety of compositions (Wang et al 2009; Butler et al 2017)
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