Evaluation of biochar pyrolyzed from kitchen waste, corn straw, and peanut hulls on immobilization of Pb and Cd in contaminated soil
Evaluation of biochar pyrolyzed from kitchen waste, corn straw, and peanut hulls on immobilization of Pb and Cd in contaminated soil
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餐厨垃圾、玉米秸秆、花生壳热解生物炭对污染土壤中Pb、Cd的固定化评价
DOI：
10.1016/j.envpol.2020.114133
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发表时间：
2020-06-01
影响因子：
8.9
通讯作者：
Lin, Aijun
中科院分区：
文献类型：
--
作者：
Xu, Congbin;Zhao, Jiwei;Lin, Aijun
生物炭原料种类繁多，不同的原料往往会产生不同的性质，如元素分布、重金属固定性能等。通过批量试验研究了餐厨垃圾(KWB)、玉米秸秆(CSB)和花生壳(PHB)热解生物炭对沼泽甘蓝(Ipomoea Aquatica Forsk)污染土壤中Cd和Pd的固定效果。通过毒理学和生理学测试相结合。结果表明，生物炭均能提高土壤pH，使土壤中可提取态铅、镉含量分别降低22.61%~71.01%、18.54%~64.35%和3.28%~60.25%。生物炭在60.00 mg/kg剂量下，根、茎、叶中Cd、Pd的积累量分别下降45.43%~97.68%、59.13%~96.64%、63.90%~99.28%。沼泽甘蓝经生物炭处理后，根长和鲜重增加，超氧化物歧化酶(SOD)和过氧化物酶(POD)活性降低。生物炭处理前后重金属形态的分布表明，生物炭可以将Cd、Pb转化为生物有效性较低的状态，从而抑制沼泽甘蓝对Cd、Pd的吸收。不同原料的生物炭的固定化性能大小顺序为：KWB>>CSB>>PHB。(C)2020爱思唯尔有限公司。保留所有权利。
Biochar has a wide range of feedstocks, and different feedstocks often resulted in different properties, such as element distribution and heavy metal immobilization performance. In this work, batch experiments were conducted to assess the effectiveness of biochar pyrolyzed from kitchen waste (KWB), corn straw (CSB), and peanut hulls (PHB) on immobilization of Cd and Pb in contaminated soil by planting swamp cabbage (Ipomoea aquatica Forsk.) with a combination of toxicological and physiological tests. The results showed that biochar could all enhance the soil pH, and reduce extractable Pb and Cd in soil by 22.61%-71.01% (KWB), 18.54%-64.35% (CSB), and 3.28%-60.25% (PHB), respectively. The biochar led to a drop in Cd and Pb accumulation in roots, stems, and leaves by 45.43%-97.68%, 59.13%-96.64%, and 63.90%-99.28% at the dosage of 60.00 mg/kg, respectively. The root length and fresh weight of swamp cabbage were promoted, while superoxide dismutase (SOD) and peroxidase (POD) decreased after biochar treatment. The distribution of heavy metal fractions before and after biochar treatment indicated that biochar could transform Cd and Pb into a state of lower bioavailability, thus inhibiting Cd and Pb uptake by swamp cabbage. Biochar with different feedstocks could be ranked by the following order according to immobilization performance: KWB > CSB > PHB. (C) 2020 Elsevier Ltd. All rights reserved.