Research On The Pretreatment Of Leachate With Tuff

The concentration of harmful substances in the leachate is several times or even hundred times in general life sewage, very difficult to treat. And leachate has product a series of environmental pollution problems through liberation and migration to the surrounding environment, and has threaten the public health and safety. All of that has become important factors constrain social and economic development, and it has aroused widespread concern around the world.Tuff distribute in nature very widely, the color is purple gray, galore cracks, small proportion, well mixed soil, the major components is volcanic tuff of weathering clay minerals. It is not only a better building material, but also a good absorbent, decolorant, filler, and molding materials and so on.This study used the modified tuff to make adsorption pretreatment of leachate, reduce COD and ammoniacal nitrogen in leachate, to provide a good condition for the following treatment.This experiment makes in-depth study to the tuff modified test, the modified tuff for leachate pretreatment static experiment, and makes a simple study to modified tuff for leachate pretreatment dynamic experiment and renewable of modified tuff, and get the best experimental conditions.The best experimental conditions of the tuff modified test are:immersion acid concentration is 10%, immersion time is 60min, roasting temperature is 200℃, roasting time is 30 min; The best experimental conditions of adsorption experiment are:leachate pH is 7.5, reaction time is 30 min, adsorbent dosage is 120g/L, reaction temperature is 15℃, rotational speed is 150rpm, dilution multiplier is 0; The best experimental conditions of dynamic experiment are:leachate pH is 7.5, stay time is 45 min, adsorbent dosage is 120g/L, reaction temperature is 15℃, dilution multiplier is 0; roasting renewable of modified tuff is under the conditions of 200℃, immersion renewable of modified tuff is under the conditions of sulfate acid concentration is lmol/L.Tuff used to be a kind of adsorption filler in leachate pretreatment, not only provide a feasible methodbut also provide a cheap and liberal material to leachate pretreatment, so this methed will play an important role on leachate treatment in our China.