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首页> 外文会议>AWMA's (Air Waste Management Association) annual conference exhibition >Minimization of Heavy Metal Containing Sludge and Recovery of Metals from Waste Water by Adsorption Using Activated Diatomite
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Minimization of Heavy Metal Containing Sludge and Recovery of Metals from Waste Water by Adsorption Using Activated Diatomite

机译：活化硅藻土的吸附可最大程度地减少含重金属的污泥并从废水中回收金属

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In this study, natural diatomite with high specific surface area and highpermeability was used as an adsorbent to reduce the heavy metal containing sludgeand recover copper from waste water. The original diatomite was wet chemicallyactivated with hydrothermal sodium hydroxyl. After activating, the zero point ofcharge on diatomite surface increased from pH2 to pH3.5 and the surface potentialreduced from -40mV to -60mV in the natural condition. The reducing of surfacepotential value is beneficial for the adsorption of cations onto the diatomite surface.Under the SEM observations, the original diatomite possesses porous structure clearlyand the surface area is up to 50.26 m~2/g. By alkali etching, the specific surface area ofthe diatomite after activation changed to 38.45 m~2/g. The adsorption experimentsshow also that the adsorption capacity for copper in water of activated diatomite was3 times higher (36.5 mg/g) than the original one (12.6 mg/g). This could be applied toreduce the heavy metal containing sludge in waste water treatment. By usingadsorption technology with activated diatomite as post-treatment, the chemical dosagein the precipitation process can be reduced which leads also to the minimization ofsludge production. Furthermore, the adsorbed heavy metal such as copper can berecovered by the regeneration of diatomite adsorbent as well.
机译：在这项研究中，具有高比表面积和高比重的天然硅藻土 渗透性用作吸附剂以减少含重金属的污泥 并从废水中回收铜。原来的硅藻土在化学上是湿的 用水热氢氧化钠活化。激活后，零点 硅藻土表面的电荷从pH2增加到pH3.5，表面电势 在自然条件下从-40mV降低到-60mV。减少表面 电位值有利于阳离子吸附在硅藻土表面上。 在SEM观察下，原始硅藻土具有明显的多孔结构 表面积可达50.26 m〜2 / g。通过碱蚀刻，比表面积 活化后的硅藻土变为38.45m〜2 / g。吸附实验 还表明活性硅藻土对水中铜的吸附能力为 （36.5 mg / g）的浓度是原始浓度（12.6 mg / g）的3倍。这可以应用于 减少废水处理中的含重金属污泥。通过使用 活化硅藻土作为后处理的吸附技术，化学用量 可以减少沉淀过程中的水分含量，这也导致了 污泥生产。此外，吸附的重金属如铜可以是 也可以通过硅藻土吸附剂的再生来回收。

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