Kim Hak-Min, Choi Tae-Yeol, Park Min-Ju, Jeong Dae-Woon
Industrial Technology Research Center, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam, 51140, Republic of Korea.
Department of Smart Environmental Energy Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam, 51140, Republic of Korea.
Sci Rep. 2022 Jul 27;12(1):12800. doi: 10.1038/s41598-022-16486-8.
Various agents, including ethylenediaminetetraacetic acid, oxalic acid, citric acid, and HCl, were applied to remove heavy metals from raw paper incineration ash and render the ash recyclable. Among these prepared agent solutions, ethylenediaminetetraacetic acid showed the highest efficiency for Pb removal, while oxalic acid showed the highest efficiencies for Cu, Cd, and As removal. Additionally, three modes of an advanced removal method, which involved the use of both ethylenediaminetetraacetic acid and oxalic acid, were considered for use at the end of the rendering process. Among these three modes of the advanced removal method, that which involved the simultaneous use of ethylenediaminetetraacetic acid and oxalic acid, i.e., a mixture of both solutions, showed the best heavy metal removal efficiencies. In detail, 11.9% of Cd, 10% of Hg, 28.42% of As, 31.29% of Cu, and 49.19% of Pb were removed when this method was used. Furthermore, the application of these three modes of the advanced removal method resulted in a decrease in the amounts of heavy metals eluted and brought about an increase in the CaO content of the treated incineration ash, while decreasing its Cl content. These combined results enhanced the solidification effect of the treated incineration ash. Thus, it was confirmed that the advanced removal method is a promising strategy by which recyclable paper incineration ash can be obtained.
包括乙二胺四乙酸、草酸、柠檬酸和盐酸在内的各种试剂被用于从原纸焚烧灰中去除重金属，并使灰能够回收利用。在这些制备的试剂溶液中，乙二胺四乙酸对铅的去除效率最高，而草酸对铜、镉和砷的去除效率最高。此外，在处理过程结束时考虑了三种先进去除方法的模式，这些模式涉及同时使用乙二胺四乙酸和草酸。在这三种先进去除方法的模式中，同时使用乙二胺四乙酸和草酸（即两种溶液的混合物）的模式显示出最佳的重金属去除效率。具体而言，使用该方法时，镉的去除率为11.9%，汞的去除率为10%，砷的去除率为28.42%，铜的去除率为31.29%，铅的去除率为49.19%。此外，这三种先进去除方法的应用导致了重金属洗脱量的减少，并使处理后的焚烧灰中的氧化钙含量增加，同时降低了其氯含量。这些综合结果增强了处理后的焚烧灰的固化效果。因此，证实了先进去除方法是一种有前景的策略，通过该策略可以获得可回收的纸焚烧灰。
