College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
Sci Total Environ. 2019 May 20;666:1126-1133. doi: 10.1016/j.scitotenv.2019.02.215. Epub 2019 Feb 14.
Cadmium (Cd) contamination in river sediments becomes increasingly serious, and phytoremediation has been used to remediate Cd contaminated sediments, but the remediation efficiency needs to be improved. In this study, tea waste derived biochar (TB) was used to facilitate the phytoremediation of Cd contaminated sediments. Results showed that TB at 100, 500 and 1000 mg kg increased Cd accumulation and translocation in ramie seedlings by changing Cd speciation in sediments and altering the subcellular distribution of Cd in plant cells. TB at low contents alleviated Cd induced toxicity in ramie seedlings by promoting plant growth and mitigating the oxidative stress. In addition, the activities of urease-, phosphatase-, and catalase-producing microbes in the Cd contaminated sediments were promoted by the application of TB. These findings demonstrated that biochar at low concentrations could improve the phytoremediation efficiency and mitigating Cd-induced toxicity to plants and microbes in Cd contaminated sediments. This study herein provides a novel technological application of waste biomass in controlling and mitigating risks of heavy metals.
河流沉积物中的镉（Cd）污染问题日益严重，植物修复技术已被用于修复 Cd 污染的沉积物，但修复效率有待提高。本研究采用茶废弃物衍生生物炭（TB）来促进 Cd 污染沉积物的植物修复。结果表明，TB 以 100、500 和 1000 mg/kg 的用量添加到 Cd 污染沉积物中，通过改变沉积物中 Cd 的形态和改变植物细胞中 Cd 的亚细胞分布，增加了苎麻幼苗对 Cd 的积累和转运。低含量的 TB 通过促进植物生长和减轻氧化应激来缓解 Cd 对苎麻幼苗的毒性。此外，TB 的应用还促进了 Cd 污染沉积物中产脲酶、磷酸酶和过氧化氢酶微生物的活性。这些发现表明，低浓度的生物炭可以提高 Cd 污染沉积物的植物修复效率，并减轻 Cd 对植物和微生物的毒性。本研究为利用废弃生物质控制和减轻重金属风险提供了一种新的技术应用。
