A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils

Jong Chan Yoo; Jingzi Beiyuan; Lei Wang; Daniel C.W. Tsang; Kitae Baek; Nanthi S. Bolan; Yong Sik Ok; Xiang Dong Li

doi:10.1016/j.scitotenv.2017.10.310

A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils

Jong Chan Yoo, Jingzi Beiyuan, Lei Wang, Daniel C.W. Tsang, Kitae Baek, Nanthi S. Bolan, Yong Sik Ok, Xiang Dong Li

Research output: Contribution to journal › Article › peer-review

174 Citations (Scopus)

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.

Original language	English
Pages (from-to)	572-582
Number of pages	11
Journal	Science of the Total Environment
Volume	616-617
DOIs	https://doi.org/10.1016/j.scitotenv.2017.10.310
Publication status	Published - 2018 Mar

Bibliographical note

Funding Information:
This research was financially supported by National Research Foundation ( NRF-2015R1D1A1A09060537 , Republic of Korea) and Hong Kong Research Grants Council (PolyU 15222115 and 15223517 ).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Bioaccessibility
Biodegradable chelant
Metal immobilization
Sewage sludge
Soil amendment
Soil washing

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
Waste Management and Disposal
Pollution

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10.1016/j.scitotenv.2017.10.310

Cite this

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title = "A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils",

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.",

keywords = "Bioaccessibility, Biodegradable chelant, Metal immobilization, Sewage sludge, Soil amendment, Soil washing",

author = "Yoo, {Jong Chan} and Jingzi Beiyuan and Lei Wang and Tsang, {Daniel C.W.} and Kitae Baek and Bolan, {Nanthi S.} and Ok, {Yong Sik} and Li, {Xiang Dong}",

note = "Funding Information: This research was financially supported by National Research Foundation ( NRF-2015R1D1A1A09060537 , Republic of Korea) and Hong Kong Research Grants Council (PolyU 15222115 and 15223517 ). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.scitotenv.2017.10.310",

language = "English",

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T1 - A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils

AU - Yoo, Jong Chan

AU - Beiyuan, Jingzi

AU - Wang, Lei

AU - Tsang, Daniel C.W.

AU - Baek, Kitae

AU - Bolan, Nanthi S.

AU - Ok, Yong Sik

AU - Li, Xiang Dong

N1 - Funding Information: This research was financially supported by National Research Foundation ( NRF-2015R1D1A1A09060537 , Republic of Korea) and Hong Kong Research Grants Council (PolyU 15222115 and 15223517 ). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/3

Y1 - 2018/3

N2 - 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.

AB - 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.

KW - Bioaccessibility

KW - Biodegradable chelant

KW - Metal immobilization

KW - Sewage sludge

KW - Soil amendment

KW - Soil washing

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C2 - 29128124

AN - SCOPUS:85033363948

SN - 0048-9697

VL - 616-617

SP - 572

EP - 582

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -

A combination of ferric nitrate/EDDS-enhanced washing and sludge-derived biochar stabilization of metal-contaminated soils

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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