剩余污泥中重金属的电动力学修复研究
Research on electrokinetic remediation of heavy metals in surplus sludge
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摘要: 主要研究了电极材料和电极间距对氢析出电压和电压梯度的影响，以及电极材料、阴极液pH、修复时间对不同形态重金属去除率的影响。实验结果表明，在相同条件下，氢的析出电压和电压梯度受电极材料和电极间距的影响。阳极均为高纯石墨电极，阴极分别为高纯石墨电极、铜电极和铁电极，电极间距在32.5 cm时，高纯石墨为阴极的氢的析出电压最高，电极间距在8.5 cm时，阴极为铜电极和铁电极比高纯石墨电极氢的析出电压及电压梯度都高；改变阴极pH值，延长修复时间，剩余污泥中残留的各种重金属形态发生明显变化；电极间距在8.5 cm，阴极为铜电极时，重金属去除率最高，修复时间缩短。Abstract: The effects of electrode materials and electrode spacing on the hydrogen evolution potential and voltage gradient， and the influences of electrode materials， cathode solution pH and repairing time on the removal efficiency of various heavy metals were investigated. The results revealed that under the same conditions， hydrogen evolution potential and voltage gradient were affected by the electrode materials and the electrode spacing. The high pure graphite electrodes were used as anodes， and the high pure graphite electrode， copper electrode and iron electrode were used as cathodes in this study. It was found that the highest hydrogen evolution potential was obtained on high purity graphite cathode when the electrode spacing was 32.5 cm， however， the evolution potential and the voltage gradient of hydrogen on the copper cathode or iron electrode were higher than that on purity graphite cathode when electrode spacing was 8.5 cm. The forms of heavy metals in residual sludge were obviously changed by changing the cathode solution pH and extending the repair time. The highest removal efficiency of heavy metals could be achieved in shorter repair time when the electrode spacing was 8.5 cm and the copper electrode was used as cathode.
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