Electrocoagulation of bio-filtrated landfill leachate: Fractionation of organic matter and influence of anode materials
| Autor: | Gerardo Buelna, Oumar Dia, Ben Salah Ihsen, Rino Dubé, Patrick Drogui |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Iron Health Toxicology and Mutagenesis medicine.medical_treatment Fraction (chemistry) 02 engineering and technology Fractionation Chemical Fractionation 010501 environmental sciences 01 natural sciences Electrocoagulation Absorbance medicine Environmental Chemistry Benzopyrans Organic matter Leachate Electrodes Humic Substances 0105 earth and related environmental sciences chemistry.chemical_classification Chromatography Chemistry Public Health Environmental and Occupational Health General Medicine General Chemistry 021001 nanoscience & nanotechnology Pollution Refuse Disposal Anode Waste Disposal Facilities Aeration 0210 nano-technology Filtration Water Pollutants Chemical Aluminum Nuclear chemistry |
| Zdroj: | Chemosphere. 168:1136-1141 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2016.10.092 |
| Popis: | Electrocoagulation (EC) was employed to treat residual organic matter from a landfill leachate pretreated by an aerated bio-filter system. Organic matter (humic acids (HA), fulvic acids (FA) and hydrophilic compounds (Hyl)) was fractionated using DAX-8 resin in order to estimate the efficiency of EC on each fraction. Initial characterization of the bio-filtrated landfill leachate showed that humic substances (HA + FA) represented nearly 90% of TOC. The effects of current densities, type of anode (Aluminum versus iron), and treatment time on the performance of COD removal were investigated. The best COD removal performances were recorded at a current density ranging between 8.0 and 10 mA cm−2 during 20 min of treatment time. Under these conditions, 70% and 65% of COD were removed using aluminum and iron electrodes, respectively. The fractionating of organic matter after EC treatment revealed that HA was completely removed using either aluminum or iron anode. However, FA and Hyl fractions were partially removed, with the percentages varying from 57 to 60% and 37–46%, respectively. FA and Hyl removal were quite similar using either aluminum or iron anode. Likewise, a significant decrease in 254-nm absorbance was recorded (UV254 removal of 79–80%) using either type of anode. These results proved that EC is a suitable and efficient approach for treating the residual refractory organic matter from a landfill leachate previously treated by a biological system. |
| Databáze: | OpenAIRE |
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