Removal of Pollutants in Different Landfill Leachate Treatment Processes on the Basis of Organic Matter Fractionation
| Autor: | Nouha Klai, Gerardo Buelna, Oumar Dia, Rino Dubé, Satinder Kaur Brar, Mehdi Zolfaghari, Patrick Drogui |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Iron 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law Membrane bioreactor 01 natural sciences Bioreactors Bioreactor Organic matter Leachate Waste Management and Disposal Effluent Humic Substances 0105 earth and related environmental sciences Water Science and Technology chemistry.chemical_classification Suspended solids Pollution 6. Clean water Refuse Disposal 020801 environmental engineering chemistry 13. Climate action Environmental chemistry Biofilter Nanofiltration Water Pollutants Chemical |
| Zdroj: | Journal of Environmental Quality. 47:297-305 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2017.09.0360 |
| Popis: | A combination of processes was required for the proper treatment of old landfill leachate, as it contained a high concentration of pollutants. Humic substances comprised half of the total organic carbon in the raw leachate. Mobility of di(2-ethylhexyl) phthalate (DEHP) and metals could depend on the fate of these substances. Characterization of carbon in raw leachate and effluent of the membrane bioreactor, biofiltration, electro-oxidation, electro-coagulation, and nanofiltration showed complete removal of suspended solids and colloids. Physical processes could not remove the hydrophilic fraction due to its lower molecular weight. However, high removal of the hydrophilic fraction with a molecular weight500 Da was expected in the biological process. In comparison with fulvic acid, larger sized humic acid resulted in complete removal by physicochemical processes. Because of DEHP partitioning on dissolved organic matter, especially on humic substances, its removal could be correlated with total organic carbon removal. Metals such as iron, aluminum, magnesium, and lead showed removal efficiency80% in biological processes. Electro-deposition on the surface of an electrode and precipitation by hydroxide resulted in removal efficiencies90 and50% in electro-coagulation and electro-oxidation, respectively. Rejection of metals by nanofiltration was80% and depended on the size and charge of cation. All in all, a combination of membrane bioreactor and nanofiltration seems to be the optimal process configuration for efficient treatment of old landfill leachate. |
| Databáze: | OpenAIRE |
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