| Simulated columns filled with fine sand were conducted to investigate influences of leachate properties on pollutants attenuation and bacterial activity in aquifer. Experimental results indicated that bacterial activity of young landfill leachate, aged landfill leachate and rain water through columns was up to maximum 0.154, 0.121 and 0.044 in 12 d, 17 d and 3 d, respectively; the maximum BOD5/COD was up to 0.683, 0.396 and 0.319 in 12 d, 8 d and 6 d, respectively, and the averaged increasing rate of pH was up to 0.074/d, 0.15/d and 0.055/d, respectively. COD removal efficiencies of young and aged landfill leachate which passed columns were 50% and 10%, respectively; NH+4-N adsorption capacity of aquifer media was proximately 0.85 g/kg. In addition, there was correlation between organic substrate content of aquifer media and bacterial activity. Therefore, the leachate properties had profound effects on pollutants attenuation in aquifer. |
