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首页> 美国卫生研究院文献>Royal Society Open Science >Electrokinetic remediation of heavy metals from municipal solid waste incineration fly ash pretreated by nitric acid
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Electrokinetic remediation of heavy metals from municipal solid waste incineration fly ash pretreated by nitric acid

机译：硝酸预处理电动垃圾焚烧飞灰中重金属的电动修复

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摘要

Municipal solid waste incineration (MSWI) fly ash has a high concentration of heavy metals (HMs) which are hazardous to the environment. Moreover, it has high pH and buffering capacity which hinders the removal of HMs. Another constraining factor is the considerable fraction of HMs which exist in oxidizable and reducible states. The acid pretreatment of MSWI fly ash is a key solution to this problem. Therefore, the current experiment is carried out to evaluate the effect of acid pretreatment of MSWI fly ash and reaction/proposed time on the removal efficiency of HMs through an electrokinetic experiment. The leaching experiment results show that acid pretreatment has increased the desorption/release of heavy metal ions (Pb2+, Cd2+, Cu2+ and Zn2+). It enhances the migration of HM ions in electrolytic cells which get precipitated at the cathode, thereby increasing the removal efficiency of HMs in the electrokinetic experiment. Moreover, it is found that prolonged proposed time (12 d) has significant effect on the removal efficiency of HMs. Finally, it is concluded that acid pretreatment and prolonged proposed time have enhanced the removal electrokinetic remediation of HMs which is carried out via three processes, i.e. desorption (enhanced by acidification), migration and precipitation.
机译：市政固体废物焚烧（MSWI）飞灰具有高浓度的重金属（HMs），对环境有害。此外，它具有高pH值和缓冲能力，阻碍了HM的去除。另一个限制因素是相当大比例的HMs以可氧化和可还原状态存在。 MSWI飞灰的酸预处理是解决此问题的关键方法。因此，目前的实验是通过电动实验来评估酸预处理MSWI飞灰和反应/建议的时间对HMs去除效率的影响。浸出实验结果表明，酸预处理提高了重金属离子（Pb 2 + ，Cd 2 + ，Cu 2 + 和Zn 2 + ）。它增强了电解池中HM离子的迁移，这些离子在阴极沉淀，从而在电动实验中提高了HMs的去除效率。此外，发现延长建议的时间（12 d）对HMs的去除效率有显着影响。最后，得出的结论是，酸预处理和延长的提议时间增强了HMs的去除电动修复，这是通过三个过程进行的，即解吸（通过酸化增强），迁移和沉淀。

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