某生活垃圾卫生填埋场渗滤液的梯度分离与表征
Gradient separation for pollutants in leachate of a sanitary landfill and its characterization
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摘要: 目前，渗滤液中污染物的粒度分布及其在渗滤液污染控制中的作用日益受到关注。通过系列微滤膜（1.2 μm及0.45 μm）对某生活垃圾卫生填埋场渗滤液各处理单元的渗滤液进行梯度分离，发现悬浮物对COD、浊度的影响较大；COD主要在胶体态和可溶解态间分配，不同渗滤液中的分配情况不同；磷主要与胶体、悬浮物以各种形式结合而存在；细胶粒和溶解态等小分子对TN的贡献大；不同粒度物质对pH的影响不明显；总残渣在可溶态组分中所占比例较大。膜微滤处理渗滤液可以有效的去除一部分物质，使COD、TP、TN、浊度、电导率都有不同程度的降低，pH逐渐升高，但对总N、残渣的去除效果不好。Abstract: 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.
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