Sequential washing and eluent regeneration with agricultural waste extracts and residues for facile remediation of meta-contaminated agricultural soils

Shuai Yang; Yuan Li; Guo-Ming Liu; Shao-Cheng Si; Xia Zhu; Chen Tu; Lian-Zhen Li; Yong-Ming Luo

doi:10.1016/j.scitotenv.2022.155548

Sequential washing and eluent regeneration with agricultural waste extracts and residues for facile remediation of meta-contaminated agricultural soils

Sci Total Environ. 2022 Aug 20:835:155548. doi: 10.1016/j.scitotenv.2022.155548. Epub 2022 Apr 28.

Authors

Shuai Yang¹, Yuan Li², Guo-Ming Liu³, Shao-Cheng Si¹, Xia Zhu³, Chen Tu², Lian-Zhen Li², Yong-Ming Luo⁴

Affiliations

¹ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China; University of the Chinese Academy of Sciences, Beijing 100049, China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China.
³ CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences (CAS), Nanjing 210008, China.
⁴ CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China; CAS Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences (CAS), Nanjing 210008, China; University of the Chinese Academy of Sciences, Beijing 100049, China. Electronic address: ymluo@issas.ac.cn.

PMID: 35489479
DOI: 10.1016/j.scitotenv.2022.155548

Abstract

Washing with organic acids and dissolved organic carbon (DOC) is a promising technique for effective removal of potentially toxic metals from agricultural soils and the two key factors are the screening of inexpensive, high-efficiency, and environmentally friendly washing agents and the safe treatment of waste eluent. We used extracts from agro-forestry wastes (pineapple peel, lemon peel, grapefruit peel and gardening crabapple fruit) to develop a facile two-stage sequential washing method (extracts and/or citric acid (CA) and coupled with extracts) and regenerated waste eluent. The washing efficiencies of Cd and Cu were significantly increased by pineapple peel (PP) using two-stage sequential washing with the sequence of PP + CA-PP > CA-PP > PP-PP. The potential pollution risk from soil Cd was lowered by 33.0% from moderate to low risk, and soil nutrient contents increased. 80.9% of Cd and 81.3% of Cu in waste eluent were efficiently removed by the PP residues. The removal mechanisms of metals in soils and eluents by PP washing agents and residues can be attributed to acid activation, cation exchange and complexation between metal ions and carboxyl groups. Therefore, the PP extracts and residues are potentially suitable for the removal of Cd and Cu from polluted agricultural soils and washing waste eluents.

Keywords: Agricultural soils; Plant extracts; Potentially toxic metals; Soil washing; Waste eluent treatment.

MeSH terms

Cadmium / analysis
Citric Acid
Environmental Restoration and Remediation*
Metals, Heavy* / analysis
Soil / chemistry
Soil Pollutants* / analysis

Substances

Metals, Heavy
Soil
Soil Pollutants
Cadmium
Citric Acid