Comparison of Phytoremediation Potential of Nerium indicum with Inorganic Modifier Calcium Carbonate and Organic Modifier Mushroom Residue to Lead–Zinc Tailings

Rongkui Su, Qiqi Ou, Hanqing Wang, Yiting Luo (), Xiangrong Dai, Yangyang Wang, Yonghua Chen () and Lei Shi
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Rongkui Su: School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Qiqi Ou: School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Hanqing Wang: School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Yiting Luo: Hunan First Normal University, Changsha 410205, China
Xiangrong Dai: PowerChina Zhongnan Engineering Corporation Limited, Changsha 410004, China
Yangyang Wang: College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
Yonghua Chen: School of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Lei Shi: Henan University of Engineering, Zhengzhou 451191, China

IJERPH, 2022, vol. 19, issue 16, 1-15

Abstract: At present, the application of phytoremediation technology in the ecological remediation of heavy metal tailings is receiving more and more attention. In this study, the physiological and biochemical response and tolerance mechanism of woody plant Nerium indicum to Pb and Zn under different proportions of inorganic modifier calcium carbonate (C1: 5%, C2: 10%, C3: 15%) and organic modifier mushroom residue (M1: 10%, M2: 20%, M3: 30%) was compared. The results showed that the pH value has a trend of C group > M group > CK group and organic matter has a trend of M group > CK group > C group. Phosphatase activity and catalase activity has a trend of M group > C group > CK group, but catalase was more vulnerable to the calcium carbonate concentration. Both modifiers can promote the transformation of Pb, Zn, Cu, and Cd in tailings to more stable organic bound and residual states. However, the stabilization effect of mushroom residue is better, and its stability is Pb, Zn > Cd, Cu. Both modifiers can increase the biomass of Nerium indicum and the modification effect of mushroom residue is better than calcium carbonate. Pb/Zn content and accumulation in Nerium indicum organs showed root > stem > leaf in all groups. Compared with the CK group, the enrichment coefficient of Pb/Zn in C1 and M1 groups decreased, while the translocation factor of Pb/Zn in C1 and M1 groups increased. With the increase in modifier concentration, the enrichment coefficient increases about 1.75~52.94%, but the translocation factor decreases rapidly (20.01~64.46%). Clearly, both the calcium carbonate and mushroom residue amendment could promote the growth ability of Nerium indicum in lead–zinc tailings and strengthen the phytoremediation potential.

Keywords: lead–zinc tailings; Nerium indicum; calcium carbonate; mushroom residue; phytoremediation potential (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (18)

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