کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4407473 1618812 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Integrating EDDS-enhanced washing with low-cost stabilization of metal-contaminated soil from an e-waste recycling site
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Integrating EDDS-enhanced washing with low-cost stabilization of metal-contaminated soil from an e-waste recycling site
چکیده انگلیسی


• The mobility of residual metals increased after EDDS-enhanced soil washing.
• Stabilization by biochar and fly ash minimized metal mobility after EDDS washing.
• EDDS washing removed the majority of bioavailable metals prior to stabilization.
• Integrating washing with stabilization reduced the residual risks to human health.

While chelant-enhanced soil washing has been widely studied for metal extraction from contaminated soils, there are concerns about destabilization and leaching of residual metals after remediation. This study integrated 2-h soil washing enhanced by biodegradable ethylenediaminedisuccinic acid (EDDS) and 2-month stabilization using agricultural waste product (soybean stover biochar pyrolyzed at 300 and 700 °C), industrial by-product (coal fly ash (CFA)), and their mixture. After integration with 2-month stabilization, the leachability and mobility of residual metals (Cu, Zn, and Pb) in the field-contaminated soil were significantly reduced, especially for Cu, in comparison with 2-h EDDS washing alone. This suggested that the metals destabilized by EDDS-washing could be immobilized by subsequent stabilization with biochar and CFA. Moreover, when the remediation performance was evaluated for phytoavailability and bioaccessibility, prior EDDS washing helped to achieve a greater reduction in the bioavailable fraction of metals than sole stabilization treatment. This was probably because the weakly-bound metals were first removed by EDDS washing before stabilization. Both individual and combined applications of biochar and CFA showed comparable effectiveness regardless of the difference in material properties, possibly due to the high level of amendments (150 ton ha−1). Based on the mobility and bioaccessibility results, the estimated human health risk (primarily resulting from Pb) could be mitigated to an acceptable level in water consumption pathway or reduced by half in soil ingestion pathway. These results suggest that an integration of EDDS washing with soil stabilization can alleviate post-remediation impacts of residual metals in the treated soil.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 159, September 2016, Pages 426–432
نویسندگان
, , , , , , ,