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Wang Feng,Miao Lijuan,Zhang Mingyue,Ying Yucui,Zhang Chengye,Wang Yifan,Zhang Weiwen,Zhu Weiqin.Adsorption property of Pb and Cd by substrate residues after vermicomposting of cow dung mixed with minerals[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE) ,2021,37(6):197-204
Adsorption property of Pb and Cd by substrate residues after vermicomposting of cow dung mixed with minerals
Received:October 15, 2020  Revised:March 10, 2021
Foundation item:杭州市农业科研攻关项目(20180432B08);浙江省自然科学基金项目(LY17B070004);浙江省大学生新苗人才项目(2020R427035);杭州师范大学本科生创新能力提升工程项目(CX2020124);2020年杭州师范大学"星光计划"大学生创新创业项目
Author NameAffiliation
Wang Feng Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Miao Lijuan Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Zhang Mingyue Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Ying Yucui Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Zhang Chengye Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Wang Yifan Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Zhang Weiwen Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
Zhu Weiqin Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China 
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Abstract: High concentrations of heavy metals lead (Pb) and cadmium (Cd) in soil have triggered a serious threat to plant growth, animal health, and ecological environment for human survival. Non-biodegradable Pb and Cd contamination in soil can be easily transferred to agricultural crops through the soil-plant-food chain, easy to endanger human body health. Alternatively, in situ stabilization is an effective technology to reduce the toxicity of such heavy metals. However, it is particularly important to choose the cost-effective materials with significant stability effects in soil. This study aims to seek in situ stabilized remediation materials with a high adsorption efficiency of heavy metal. A vermicomposting experiment of cow dung mixed with high calcium and magnesium minerals or sepiolite was conducted to analyze the variation of substrate residues properties and the adsorption characteristics of Pb2+ and Cd2+. Firstly, the growth indexes of earthworms were selected for the feasibility of vermicomposting cow dung mixed with minerals. Then, the substrate residues were characterized, including pH value, cation exchange capacity, morphology under a Scanning Electron Microscopy (SEM), mineral components under X-Ray Diffraction (XRD), and surface functional groups under a Fourier Transform Infrared Spectroscopy (FTIR). Finally, batch adsorption experiments were carried out to evaluate the adsorption efficiency of Pb2+ and Cd2+ from aqueous solution. The results demonstrated that the earthworms survived well with high calcium and magnesium minerals or sepiolite addition. The earthworm treatment reduced pH value, C/N, and organic content, while, increased the cation exchange capacity, and the specific surface area of substrate residues. High calcium and magnesium minerals or sepiolite addition both increased the pH value, cation exchange capacity, and specific surface area of substrate residues. FTIR analysis showed that the earthworm treatment had more alcohol or carboxylic acids and aromatic substance, while, less lipid material and polysaccharide substance in substrate residues, compared with the untreatment. The addition of high calcium and magnesium mineral also produced more Me-O groups in substrate residues. XRD analysis showed that more silicate and soluble salts were found in the earthworm treatment, compared with the untreatment. The addition of high calcium and magnesium mineral produced silicate, CaO and MgO components, whereas, the sepiolite addition produced silicate and MgO components in substrate residues. The batch adsorption experiment showed that the earthworm treatment had better adsorption capacity of Pb2+and Cd2+ in aqueous solution. The adsorption efficiency of Pb2+and Cd2+ was the best for the substrate residues rom the vermicomposting process of cow dung mixed with high calcium and magnesium minerals. The adsorption rates of Pb2 + and Cd2 + were 77.8% and 59.7%, respectively, whereas, the desorption rate of adsorption states Pb2+ and Cd2+ were 0.02% and 6.66%, respectively. It infers that the adsorption mechanism of VG for Pb2+and Cd2+ involved in the physical adsorption, ion exchange, electrostatic adsorption, precipitation, and complexation. A high adsorption efficiency of Pb2+and Cd2+ from aqueous solution was achieved under the higher pH value, cation exchange capacity and specific surface area, abundant functional groups and mineral components in VG. Therefore, it is feasible to produce substrate residues with high Pb2+and Cd2+ adsorption capacity via adding high calcium and magnesium mineral into cow dung for vermicomposting. The findings can provide an insightful theoretical basis to effectively optimize key parameters for the vermicomposting of cow dung mixed with minerals, and thereby to promote the recycling efficiency of organic solid wastes and the safe utilization of heavy-metal contaminated soil.
KeyWord:heavy metals  minerals  vermicomposting  substrate residues  adsorption  Pb2+  Cd2+
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