Heavy metal recovery from the fine fraction of solid waste incineration bottom ash by wet density separation

Abstract

This work is aimed at exploring the recovery of heavy metals from the fine fraction of solid waste incineration bottom ash. For this study, wet-discharged bottom ash fine-fraction samples from full-scale treatment plants in Germany and Sweden were analyzed. The potential for the recovery of heavy metal compounds was investigated through wet density-separation with a shaking table. The feed materials were processed without any pre-treatment and the optimum processing conditions were determined by means of design of experiments. Tilt angle and stroke frequency were identified as the most relevant parameters, and the optimum settings were − 7.5° and 266 rpm, respectively. The obtained balanced copper enrichments (and yields) were 4.4 (41%), 6.2 (28%) and 2.4 (23%). A maximum copper enrichment of 14.5 with 2% yield was achieved, providing a concentrate containing 35.9 wt.% relevant heavy metal elements. This included 26.3 wt.% iron, 4.3 wt.% zinc and 3.8 wt.% copper. In conclusion, density separation with shaking tables can recover heavy metals from bottom ash fine fractions. Medium levels of heavy metal enrichment (e.g., for Cu 2.7–4.4) and yield (Cu: 26–41%) can be reached simultaneously. However, the separation performance also depends on the individual bottom ash sample.

Investigating the Change Of Ash’s Heavy Element Contents In Upper Egypt Electricity Power Company (UEEPC) In According To Egypt vision 2030

“…The partitioning of the metals is conventionally quantified by an enrichment factor EF, which is the ratio of the concentration of element in an ash from a combustor to its effective concentration in the ash content of the original fuel [8,9]. Fabian Sweden [10]. Latva-Somppi et al [9,11] found significant enrichment of many metals in the fly ash.…”

Micronutriënten in de Kringloop : eindrapportage WP4 : afvalwater en huishoudelijk organisch afval, herkomst, bestemming en stofstroom analyse, scenariostudies voor terugwinning uit huishoudelijke organische reststromen

“…Voor zover bekend worden de assen uit de verbranding momenteel vooral gebruikt in de bouw (Kupfernagel et al, 2017). Recentelijk zijn er studies geweest naar de mogelijke terugwinning van Fe, Zn, Pb and Cu uit bodem-en vliegassen van restafvalverbranding (bijvoorbeeld (Kupfernagel et al, 2017;Pienkoß et al, 2022)). De beste terugwinning van micronutriënten zal waarschijnlijk kunnen plaatsvinden uit bron gescheiden materialen.…”