Please use this identifier to cite or link to this item:
Title: A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils
Authors: Yoo, JC 
Beiyuan, J 
Wang, L 
Tsang, DCW 
Baek, K
Bolan, NS
Ok, YS
Li, XD 
Keywords: Bioaccessibility
Biodegradable chelant
Metal immobilization
Sewage sludge
Soil amendment
Soil washing
Issue Date: 2018
Publisher: Elsevier B.V.
Source: Science of the total environment, 2018, v. 616-617, p. 572-582 How to cite?
Journal: Science of the total environment 
Abstract: In this study, soil washing and stabilization as a two-step soil remediation strategy was performed to remediate Pb- and Cu-contaminated soils from shooting range and railway sites. Ferric nitrate (Fe(NO3)3) and [S,S]-ethylenediamine disuccinate (EDDS) were used as washing agents, whereas three types of sludge-derived biochars and phosphogypsum were employed as soil stabilizers. While Fe(NO3)3 extracted larger amounts of metals compared to EDDS (84% Pb and 64% Cu from shooting range soil; 30% Pb and 40% Cu from railway site soil), it caused severe soil acidification. Both Fe(NO3)3 and EDDS washing enhanced the mobility of residual metals in the two soils, which in most cases could be mitigated by subsequent 2-month stabilization by sludge-derived biochars or phosphogypsum. By contrast, the metal bioaccessibility could only be reduced by soil washing. Nutrient-rich sludge-derived biochar replenished available P and K in both soils, whereas Fe(NO3)3 washing provided available nitrogen (N). Soil amendment enhanced acid phosphatase activity but marginally improved soil dehydrogenase and urease activity in the treated soils, possibly due to the influence of residual metals. This study supported the integration of soil washing (by Fe(NO3)3 or EDDS) with soil stabilization (by sludge-derived biochars or phosphogypsum) for accomplishing the reduction of metal mobility and bioaccessibility, while restoring the environmental quality of the treated soils.
ISSN: 0048-9697
EISSN: 1879-1026
DOI: 10.1016/j.scitotenv.2017.10.310
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Last Week
Last month
Citations as of Mar 21, 2019


Last Week
Last month
Citations as of Apr 9, 2019

Page view(s)

Last Week
Last month
Citations as of May 21, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.