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Immobilization and sorption of Cd and Pb in contaminated stagnic anthrosols as amended with biochar and manure combined with inorganic additives.
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2019-12-20 , DOI: 10.1016/j.jenvman.2019.109999 Yasir Hamid 1 , Lin Tang 1 , Bilal Hussain 1 , Muhammad Usman 2 , Muhammad Laeeq Ur Rehman Hashmi 1 , Muhammad Bilal Khan 1 , Xiaoe Yang 1 , Zhenli He 3
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2019-12-20 , DOI: 10.1016/j.jenvman.2019.109999 Yasir Hamid 1 , Lin Tang 1 , Bilal Hussain 1 , Muhammad Usman 2 , Muhammad Laeeq Ur Rehman Hashmi 1 , Muhammad Bilal Khan 1 , Xiaoe Yang 1 , Zhenli He 3
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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.
中文翻译：
通过生物炭和肥料与无机添加剂的组合，可将Cd和Pb固定和吸附在受污染的滞止性人为土壤中。
本研究评估了预先选择的复合修饰剂（CA-1：生物炭-海泡石沸石和CA-2：肥料-石灰-海泡石）在田间和分批吸附实验中对Cd和Pb的固定和吸附效果。田间试验是在被共同污染的粘土紫色土壤（淤泥人为土壤）中进行的。与对照实验（T1）一起，通过种植小麦作为试验作物，以不同的速率对CA-1和CA-2进行了测试，包括750、1500、3000和6000 kg ha-1。获得的结果表明，与对照（5.63）相比，两种复合物的最高剂量（T5：6000 kg ha-1和T9：6000 kg ha-1）分别将土壤pH值分别提高至6.85和6.81。在收获期样品中，复合处理（T7和T4）可减少DTPA提取的Cd和Pb含量。金属分馏显示，在收获阶段施用修正剂会降低可交换分数。CA-2和CA-1（3000 kg ha-1）的施用显着提高了小麦的植物生物量（分别提高了28％和24％）和谷物产量（分别提高了26％和22％）。此外，分批吸附实验结果表明，Langmuir吸附模型更好地拟合了Cd和Pb的R2值在0.99和0.91之间的吸附结果。CA-1和CA-2对Cd的吸附量最大，各处理之间无显着差异，但CA-1的Pb吸附量最高，其次是CA-2和对照。我们的实验结果表明，将有机物与无机材料结合使用可增强Cd和Pb的固定和吸附能力，因此降低了实验室和现场条件下金属的利用率。此外，对于田间试验，出现了在3000 kg ha-1的复合改良剂的应用，作为被测小麦种植区的合适处理方法。
更新日期：2019-12-21
中文翻译：
通过生物炭和肥料与无机添加剂的组合，可将Cd和Pb固定和吸附在受污染的滞止性人为土壤中。
本研究评估了预先选择的复合修饰剂（CA-1：生物炭-海泡石沸石和CA-2：肥料-石灰-海泡石）在田间和分批吸附实验中对Cd和Pb的固定和吸附效果。田间试验是在被共同污染的粘土紫色土壤（淤泥人为土壤）中进行的。与对照实验（T1）一起，通过种植小麦作为试验作物，以不同的速率对CA-1和CA-2进行了测试，包括750、1500、3000和6000 kg ha-1。获得的结果表明，与对照（5.63）相比，两种复合物的最高剂量（T5：6000 kg ha-1和T9：6000 kg ha-1）分别将土壤pH值分别提高至6.85和6.81。在收获期样品中，复合处理（T7和T4）可减少DTPA提取的Cd和Pb含量。金属分馏显示，在收获阶段施用修正剂会降低可交换分数。CA-2和CA-1（3000 kg ha-1）的施用显着提高了小麦的植物生物量（分别提高了28％和24％）和谷物产量（分别提高了26％和22％）。此外，分批吸附实验结果表明，Langmuir吸附模型更好地拟合了Cd和Pb的R2值在0.99和0.91之间的吸附结果。CA-1和CA-2对Cd的吸附量最大，各处理之间无显着差异，但CA-1的Pb吸附量最高，其次是CA-2和对照。我们的实验结果表明，将有机物与无机材料结合使用可增强Cd和Pb的固定和吸附能力，因此降低了实验室和现场条件下金属的利用率。此外，对于田间试验，出现了在3000 kg ha-1的复合改良剂的应用，作为被测小麦种植区的合适处理方法。
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