Recovery of heavy metals in electrostatic precipitator ash by carbon dioxide as a pre-extraction reagent

Kung Yuh Chiang, Lih Ming Huang, Yi Shin Lee, Kuen Sheng Wang

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)

摘要

This study investigated the efficiency of heavy metal separation and recovery in electrostatic precipitator (ESP) ash from a municipal solid waste incinerator (MSWI) when carbon dioxide is used as the pre-extraction agent. The experiments were conducted at 120°C with pH values of 3-6 and liquid-to-solid (L/S) ratios varying from 10:1 to 40:1. The results indicate that an increase in the L/S ratio enhances the separation and recovery efficiency of heavy metals in the MSWI ash. The separation efficiency of Cd, Cr, and Zn increased significantly with the increased L/S ratio. The pH level was the prominent factor affecting the extraction of heavy metals from ESP ash: at pH 3-4, maximum amounts of Cd and Cr were extracted. However, due to the increased release of ions with increased CO32-, Zn was relatively soluble at high pH values. In cases with an L/S ratio of 40:1 and pH 3, the Cd, Cr, and Cu extraction amounts were 86.4%, 71.2%, and 34.9%, respectively. Pb and its compounds remained in a stable state under experimental conditions. The above results point toward the feasibility of heavy metal recovery and fly ash reutilization when carbon dioxide is used as the pre-extraction agent. Both greenhouse gas (CO2) emissions and acid extraction operating costs are reduced with this process.

原文???core.languages.en_GB???
頁(從 - 到)2327-2339
頁數13
期刊Separation Science and Technology
36
發行號10
DOIs
出版狀態已出版 - 2001

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