Abstract
This study is a comparison of the effect of biochar produced by bioenergy systems, via the pyrolysis and gasification processes, on the immobilization of metals/metalloids in soil. Because the processes for these two techniques vary, the feedstocks undergo different heating regimens and, as a result, their respective char products exhibit different physico-chemical properties. Therefore, this study focuses on (1) the characterization of derivative biochar from the bioenergy system to understand their features and (2) an exploration of various biochar impacts on the mobility of As and Pb in contaminated soil. The results showed bioenergy biochars (BBCs) performed well in mitigating Pb extractability (1 M ammonium acetate) with a Pb immobilization >80%, but unfavorably mobilized the bioavailable As, likely because of electrostatic repulsion and ion exchange competition. The BBC surface functional group would chemically bond with the As and remain stable against the pH change. An increment in aromatic carbon would effectively enhance cation-π interaction for Pb immobilization. Nevertheless, an amendment with richer condensed structure and higher inorganic minerals (Ca2+, K+, Mg2+, and Na+) can lead to better performance in retaining Pb.
| Original language | English |
|---|---|
| Pages (from-to) | 704-713 |
| Number of pages | 10 |
| Journal | Science of the Total Environment |
| Volume | 640-641 |
| DOIs | |
| Publication status | Published - 2018 Nov 1 |
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Keywords
- Black carbon
- Chemical stabilization
- Gasification
- Slow pyrolysis
- Soil remediation
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
Cite this
Characterization of bioenergy biochar and its utilization for metal/metalloid immobilization in contaminated soil. / Yang, Xiao; Igalavithana, Avanthi D.; Oh, Sang Eun; Nam, Hyungseok; Zhang, Ming; Wang, Chi Hwa; Kwon, Eilhann E.; Tsang, Daniel C.W.; Ok, Yong Sik.
In: Science of the Total Environment, Vol. 640-641, 01.11.2018, p. 704-713.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Characterization of bioenergy biochar and its utilization for metal/metalloid immobilization in contaminated soil
AU - Yang, Xiao
AU - Igalavithana, Avanthi D.
AU - Oh, Sang Eun
AU - Nam, Hyungseok
AU - Zhang, Ming
AU - Wang, Chi Hwa
AU - Kwon, Eilhann E.
AU - Tsang, Daniel C.W.
AU - Ok, Yong Sik
PY - 2018/11/1
Y1 - 2018/11/1
N2 - This study is a comparison of the effect of biochar produced by bioenergy systems, via the pyrolysis and gasification processes, on the immobilization of metals/metalloids in soil. Because the processes for these two techniques vary, the feedstocks undergo different heating regimens and, as a result, their respective char products exhibit different physico-chemical properties. Therefore, this study focuses on (1) the characterization of derivative biochar from the bioenergy system to understand their features and (2) an exploration of various biochar impacts on the mobility of As and Pb in contaminated soil. The results showed bioenergy biochars (BBCs) performed well in mitigating Pb extractability (1 M ammonium acetate) with a Pb immobilization >80%, but unfavorably mobilized the bioavailable As, likely because of electrostatic repulsion and ion exchange competition. The BBC surface functional group would chemically bond with the As and remain stable against the pH change. An increment in aromatic carbon would effectively enhance cation-π interaction for Pb immobilization. Nevertheless, an amendment with richer condensed structure and higher inorganic minerals (Ca2+, K+, Mg2+, and Na+) can lead to better performance in retaining Pb.
AB - This study is a comparison of the effect of biochar produced by bioenergy systems, via the pyrolysis and gasification processes, on the immobilization of metals/metalloids in soil. Because the processes for these two techniques vary, the feedstocks undergo different heating regimens and, as a result, their respective char products exhibit different physico-chemical properties. Therefore, this study focuses on (1) the characterization of derivative biochar from the bioenergy system to understand their features and (2) an exploration of various biochar impacts on the mobility of As and Pb in contaminated soil. The results showed bioenergy biochars (BBCs) performed well in mitigating Pb extractability (1 M ammonium acetate) with a Pb immobilization >80%, but unfavorably mobilized the bioavailable As, likely because of electrostatic repulsion and ion exchange competition. The BBC surface functional group would chemically bond with the As and remain stable against the pH change. An increment in aromatic carbon would effectively enhance cation-π interaction for Pb immobilization. Nevertheless, an amendment with richer condensed structure and higher inorganic minerals (Ca2+, K+, Mg2+, and Na+) can lead to better performance in retaining Pb.
KW - Black carbon
KW - Chemical stabilization
KW - Gasification
KW - Slow pyrolysis
KW - Soil remediation
UR - http://www.scopus.com/inward/record.url?scp=85047806774&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047806774&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2018.05.298
DO - 10.1016/j.scitotenv.2018.05.298
M3 - Article
C2 - 29870947
AN - SCOPUS:85047806774
VL - 640-641
SP - 704
EP - 713
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
ER -