TY - JOUR
T1 - Immobilization and sorption of Cd and Pb in contaminated stagnic anthrosols as amended with biochar and manure combined with inorganic additives
AU - Hamid, Yasir
AU - Tang, Lin
AU - Hussain, Bilal
AU - Usman, Muhammad
AU - Rehman Hashmi, Muhammad Laeeq ur
AU - Bilal Khan, Muhammad
AU - Yang, Xiaoe
AU - He, Zhenli
N1 - Funding Information:
This research was financially supported by Ministry of Science and Technology of China (#2016YFD0800805), and Zhejiang Provincial Science and Technology Bureau (#2015C02011-3; #2015C03020-2).
Funding Information:
This research was financially supported by Ministry of Science and Technology of China (# 2016YFD0800805 ), and Zhejiang Provincial Science and Technology Bureau (# 2015C02011-3 ; # 2015C03020-2 ). Appendix A
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/3/1
Y1 - 2020/3/1
N2 - The present study evaluated the efficiency of pre-selected composite amendments (CA-1: biochar-lime-sepiolite-zeolite and CA-2: manure-lime-sepiolite) for immobilization and sorption of Cd and Pb in field and batch sorption experiments. The field experiment was performed in a co-contaminated clay purple soil (stagnic anthrosols). Along with a control experiment (T1), CA-1 and CA-2 were tested at different rates including 750, 1500, 3000 and 6000 kg ha−1 by growing wheat as the test crop. The obtained results revealed that the highest dose of both composites (T5: 6000 kg ha−1 and T9: 6000 kg ha−1) increased the soil pH to 6.85 and 6.81, respectively as compared to the control (5.63). DTPA-extractable Cd and Pb contents decreased with composite treatments (T7 and T4) at harvest stage samples. Metal fractionation depicted that application of amendments decreased the exchangeable fraction at harvesting stage. Application of CA-2 and CA-1 (3000 kg ha−1) significantly increased the plant biomass (by 28% and 24%, respectively) and grain yield (by 26% and 22%, respectively) of wheat. Furthermore, batch sorption experiment results revealed that Langmuir adsorption model better fitted the sorption results with R2 values ranging between 0.99 and 0.91 for Cd and Pb, respectively. CA-1 and CA-2 exhibited the maximum adsorption capacity for Cd with no significant difference among treatments but Pb adsorption capacity was highest in CA-1 followed by CA-2 and control. The results of our experiments revealed that the application of organics combined with inorganic materials enhanced Cd and Pb immobilization and sorption, consequently reducing metals availability in laboratory and field conditions. Moreover, for field trials, application of the composite amendments at 3000 kg ha−1 emerged as the suitable treatment for tested wheat-grown area.
AB - The present study evaluated the efficiency of pre-selected composite amendments (CA-1: biochar-lime-sepiolite-zeolite and CA-2: manure-lime-sepiolite) for immobilization and sorption of Cd and Pb in field and batch sorption experiments. The field experiment was performed in a co-contaminated clay purple soil (stagnic anthrosols). Along with a control experiment (T1), CA-1 and CA-2 were tested at different rates including 750, 1500, 3000 and 6000 kg ha−1 by growing wheat as the test crop. The obtained results revealed that the highest dose of both composites (T5: 6000 kg ha−1 and T9: 6000 kg ha−1) increased the soil pH to 6.85 and 6.81, respectively as compared to the control (5.63). DTPA-extractable Cd and Pb contents decreased with composite treatments (T7 and T4) at harvest stage samples. Metal fractionation depicted that application of amendments decreased the exchangeable fraction at harvesting stage. Application of CA-2 and CA-1 (3000 kg ha−1) significantly increased the plant biomass (by 28% and 24%, respectively) and grain yield (by 26% and 22%, respectively) of wheat. Furthermore, batch sorption experiment results revealed that Langmuir adsorption model better fitted the sorption results with R2 values ranging between 0.99 and 0.91 for Cd and Pb, respectively. CA-1 and CA-2 exhibited the maximum adsorption capacity for Cd with no significant difference among treatments but Pb adsorption capacity was highest in CA-1 followed by CA-2 and control. The results of our experiments revealed that the application of organics combined with inorganic materials enhanced Cd and Pb immobilization and sorption, consequently reducing metals availability in laboratory and field conditions. Moreover, for field trials, application of the composite amendments at 3000 kg ha−1 emerged as the suitable treatment for tested wheat-grown area.
KW - Biochar
KW - Freundlich model
KW - Immobilization
KW - Langmuir model
KW - Manure
KW - Sorption
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U2 - 10.1016/j.jenvman.2019.109999
DO - 10.1016/j.jenvman.2019.109999
M3 - Article
C2 - 31868649
AN - SCOPUS:85076693001
SN - 0301-4797
VL - 257
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 109999
ER -