Physico-chemical and biological treatment of MSW landfill leachate |
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| Authors: | L Castrillón Y Fernández-Nava M Ulmanu I Anger E Marañón |
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| Institution: | 1. Chemical Engineering and Environmental Technology Department, University Technology Institute of Asturias (IUTA), University of Oviedo, Campus of Gijón, 33203 Gijón, Spain;2. Institute for Non-ferrous and Rare Metals (IMNR), 102 Biruin?ei Bvld, Bucharest-Pantelimon, Romania;1. Ecole Nationale Polytechnique, URIE, B.P. 182-16200, El Harrach, Algiers, Algeria;2. Centre de Recherche en Technologie des Semi-Conducteurs Pour l’Energétique (CRTSE), Division CCPM, 2, Bd Dr. Frantz Fanon, P.O. Box 140, 7 merveilles, Alger 16038, Algeria;3. University of Technology of Compiègne, Département Génie Chimique, B.P. 20.509, 60205 Compiègne Cedex, France;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, People’s Republic of China;2. Thi Qar University, Nasiriyah, Iraq;1. Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland;2. Ryan Institute, National University of Ireland, Galway, Ireland;3. Earth and Ocean Sciences, School of Natural Sciences, National University of Ireland, Galway, Ireland;4. Socio-Economic Marine Research Unit, J.E. Cairnes School of Business and Economics, National University of Ireland, Galway, Ireland;1. Department of Civil, Environmental and Architectural Engineering, University of Padova, via Marzolo 9, 35131, Padova, Italy;2. Laboratory of Technologies for Waste, Wastewater and Raw Materials Management, Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), via M.M. Sole 4, 40129, Bologna, Italy;3. Cranfield Water Science Institute, Cranfield University, Bedford, MK43 0AL, UK;4. Department of Industrial Engineering, University of Padova, via Marzolo 9, 35131, Padova, Italy |
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| Abstract: | This paper analyses the evolution of the physico-chemical characteristics of the leachate from the Central Landfill of Asturias (Spain), which has been operating since 1986, as well as different treatment options. The organic pollutant load of the leachate, expressed as chemical oxygen demand (COD), reached maximum values during the first year of operation of the landfill (around 80,000 mg/L), gradually decreasing over subsequent years to less than 5000 mg/L. The concentration of ammonium, however, has not decreased, presenting values of up to 2000 mg/L. When feasible, recirculation can greatly decrease the organic matter content of the leachate to values of 1500–1600 mg COD/L. Applying anaerobic treatment to leachates with a COD between 11,000 and 16,000 mg/L, removal efficiencies of 80–88% were obtained for organic loading rates of 7 kg COD/m3 d. For leachates with lower COD (4000–6000 mg/L), the efficiency decreased to around 60% for organic loading rates of 1 kg COD/m3 d.Applying coagulation–flocculation with iron trichloride or with aluminium polychloride, it was possible to reduce the non-biodegradable organic matter by 73–62% when treating old landfill leachate (COD: 4800 mg/L, BOD5: 670 mg/L), also reducing turbidity and colour by more than 97%. It is likewise possible to reduce the non-biodegradable organic matter that remains after biological treatment by adsorption with activated carbon, although adsorption capacities are usually low (from 15 to 150 mg COD/g adsorbent). As regards ammonium nitrogen, this can be reduced to final effluent values of 5 mg/L by means of nitrification/denitrification and to values of 126 mg/L by stripping at pH 12 and 48 h of stirring. |
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