Refuse in the landfills and dumping sites becomes stabilized or aged over time. The aged refuse contaiu. a wide speetram and large quantity of micro-organisms, which can effectively decompose refractory or-ganic matter present in some wastewaters, such as MSW landfill leachate. In this study, a biofiltration reactor consisted of the aged refuse excavated from a 10-year-old closed landfill compartment in the Shang-hai Refuse Landfill (SRL) was used for biofiltration of livestock and poultry waste water sampled from a farm. Two hundred kilograms of screened aged refuse (diameter less than 15 ram) was used as bioffl-tmtion material in a cylindrical biofilter with a 40-cm inner diameter and a 150-era height. Around 50L/day (at a hydraulic load of 250L/m3 refuse/day) of the preliminary-treated influent livestock wast-waters with initial CODcr, BOD5, NH3-N. total phosphorus concentrations of 197-2,419, 102-.459, 260-1,140, and 24-102 mg/L, was intermittently sprayed over the refuse surface once a day with 3h per interval, The pollutant concentrations were reduced to below 185mg/L CODc, 15mg/L BOD5, 27mg/L NH3-N, and 0.5mg/L total phosphorus, with a removal of 64, 54, 75, 88, 94, and 99%, respectively. However, the removal of the total N is quite low, only around 20-30%. The NH3-N is mainly converted to ni-trate N. The removal of the total P is high, possibly because of the strong chemical absorption capacity of the aged refuse in the biofiltration reactor used. The effluent looks clear, in contrast to the brownish colol: of the influent. The treatment process developed is cost-effective and easily operated.