Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Journal of Hazardous Materials
Fu-Shen Zhang, Hideaki Itoh

Abstract

This work examined the extraction properties of metallic elements from municipal incinerator fly ash under hydrothermal conditions. The ash was firstly pre-washed by distilled water, then subjected to hydrothermal treatments. The pre-washing process was effective for Na, K, Ca extraction with extraction percentages of 67%, 76% and 48%, respectively. The optimum contact time was 30 min for the pre-washing process. Five types of acids were tested for the extraction experiments and hydrochloric acid was found to be most effective for metal extraction from the ash. Compared to room condition, hydrothermal treatment accelerated the dissolution of the ash, thus promoted the reaction of acid with hazardous metals such as Cr, Cd, Pb, and furthermore, the consumption speed of acid was slowed down under hydrothermal condition. The acid simultaneously reacted with all the metal in the ash under hydrothermal condition but preferentially reacted with Ca at room condition. The optimum hydrothermal treatment temperature, time and liquid/solid ratio were 150 degrees C, 5h and 10:1 (ml:g), respectively.

Citations

Apr 10, 2012·Journal of Environmental Management·Renbo YangPin-Han Wu
Aug 13, 2010·Waste Management·Amr S MeawadYoncho G Pelovski
Nov 27, 2007·Waste Management·Margarida J QuinaRosa M Quinta-Ferreira
Mar 5, 2015·Waste Management·Aurore De Boom, Marc Degrez
Jul 18, 2015·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Ying Xu, Yu Chen
Nov 4, 2015·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Chih-Mei ChouYu-Min Chang
May 9, 2009·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Aixa GonzálezNatalia Moreno
May 1, 2010·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Jian JinJianhua Yan
May 9, 2009·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Efstathios K Papadimitriou, John R Barton
Apr 6, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Huan WangRongyan Zhang

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