Study on Adsorption Isotherm of Landfill Leachate on Activated Sludge

The three-stage absorption test of water sample was carried out with the activated sludge(MLSS 6 000 mg/L) as adsorbent.Effects of aeration time,pH and sludge concentration on adsorption capacity of the activated sludge were studied as well as adsorption isotherm of landfill leachate on the activated sludge.The results show that: adsorption equilibrium time is 2 h,pH is in the range of 3～9,adsorption capacity of the activated sludge is almost unchanged.Adsorption capacity of the activated sludge increases along with rise of sludge concentration,adsorption capacity of the activated sludge has little change after sludge concentration increases to 6 000 mg/L.The first and second stages adsorption isotherms of the activated sludge well accord with Freundlich adsorption isotherm,adsorption constant n is in the range of 1～10,it is proved that the activity sludge is good adsorbent.The third stage adsorption isotherm of the activated sludge well accords with Langmuir adsorption isotherm.