Gradient separation for pollutants in leachate of a sanitary landfill and its characterization
某生活垃圾卫生填埋场渗滤液的梯度分离与表征

At present,the particle size distribution of leachate pollutants and its effect on leachate contamination control attracts growing attention.This experiment,through series microfiltration membrane(1.2 μm and 0.45 μm),made a gradient separation of leachate contaminations which came from each landfill leachate process unit in a sanitary landfill.It was found that,in landfill leachate,suspended particles had an obvious influence on leachate COD value and turbidity.COD was distributed between colloidal and dissolved species and varied among the leachate samples.The phosphorus in leachate was found mostly in the suspended particles and colloidal fractions.TN was mostly stated as small molecules and found in the fine colloidal fractions and dissolve states mainly.The different particle size’s effect on pH was unobvious.Total scraps were seriously associated with the dissolved fractions.Membrane microfiltration leachate treatment can effectively remove part of materials,reduce COD,TP,TN,turbidity and conductivity to different degrees,and raise the pH gradually,but its effect on the removal of total N and scraps is unobvious.