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| Sludge in the landfills and dumping sites becomes stabilized or aged during its long-term stabilization process. The aged sludge contains a wide spectrum and large quantity of microorganisms, which can effectively decompose refractory organic matter present in some wastewaters, such as Municipal Solid Waste (MSW) landfill leachate. In this work, four biofiltration reactors consisted of the aged sewage sludge taken from a 5-year sludge lysimeter was used for biofiltration of aged MSW landfill leachate sampled from a closed landfill. Chemical Oxygen Demand (COD), Biological Oxygen Demand（BOD）,Inorganic Carbon(IC) and NH3-N concentrations in the effluent were below 250 mg/L, 10 mg/L, 60 mg/L and 10 mg/L, in comparison the initial concentrations of about 1200 mg/L, 150 mg/L, 1100 mg/L and 1000 mg/L, respectively, at a volume hydraulic load below 35.4 L•m-3•d-1 and ambient temperature of 0-20°C . However, the removal of the total nitrogen (TN) was quite low, only around 20-60%. The NH3-N is mainly converted to nitrate-N. The removal of the total P is high, possibly because of the strong absorption capability of the aged sludge in the bioreactor used. The effluent looks clear, in comparison with the brownish color of the influent. The treatment process developed is cost-effective and easily operated. |
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| Keywords:aged leachate; aged sludge; biological treatment; resource reuse |
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