共查询到17条相似文献,搜索用时 125 毫秒
1.
2.
磷矿粉修复重金属污染土壤的研究进展 总被引:1,自引:0,他引:1
《环境污染与防治》2017,(4)
重金属污染土壤的化学钝化修复技术可以有效控制重金属对植物及环境的危害。不同的改良剂对重金属污染土壤的改良效果不同,已有的研究表明难溶性磷矿粉是较好的选择。磷矿粉是一种性价比很高的改良剂,而且不会对环境造成破坏。总结了磷矿粉修复重金属污染土壤的化学机制和影响因素,重点综述了近年来不同粒径磷矿粉、改性磷矿粉修复重金属污染土壤的研究进展,旨在为重金属污染土壤的修复研究提供参考。 相似文献
3.
4.
5.
农田土壤重金属污染已成为影响我国社会经济全面发展的突出问题之一。以韶关市翁源县铁龙林场土壤修复示范工程为案例,分析了矿区重金属污染农田工程修复的设计流程、工程实施中的重点与难点、修复技术的筛选以及修复效果评估。其中重度污染区通过种植桑树降低土壤中重金属含量,并开展养桑产业链阻止重金属进入人体的研究,每年可收益9.0万~10.2万元·hm~(-2);而中轻度污染区通过采用钝化修复技术及低吸收作物品种筛选,有效降低农作物对重金属的吸收,保障农产品安全。为我国矿区重金属污染农田修复工程技术和管理提供参考。 相似文献
6.
7.
重金属污染土壤可持续原位修复:生物质基修复材料研究新进展 总被引:1,自引:0,他引:1
<正>土壤重金属污染因具有隐蔽性、长期性、不可逆性和富集性等特点,已成为影响未来农业可持续发展和人体健康的环境问题之一。修复重金属污染土壤、恢复土壤原有功能已经成为国内外的研究热点。目前,电动修复、植物修复及化学淋洗技术等修复技术虽已成功运用,但依然存在成本高、修复周期长及二次污染等问题。为实现重金属污染土壤可持续原位修复,中国科学院生 相似文献
8.
9.
10.
低成本含磷材料修复环境重金属污染的研究进展 总被引:5,自引:0,他引:5
低成本含磷材料包括磷灰石、骨粉、无机磷肥及无机磷酸盐,其对环境重金属污染的修复值得引起生态学、环境学更广泛的重视。详细介绍了:(1)各类低成本含磷材料结构性质;(2)含磷材料在修复土壤、沉积物、水体重金属污染方面的应用;(3)含磷材料修复环境重金属污染的机理及影响因素;(4)含磷材料修复环境重金属污染的效果评价等方面的研究进展及发展前景。 相似文献
11.
EDTA强化电动力学修复重金属复合污染土壤 总被引:2,自引:0,他引:2
在自制的电动力学装置中,研究多种重金属复合污染土壤的电动力学修复,通过在阴极添加络合剂EDTA来提高修复效率。实验结果表明,EDTA的引入提高了修复过程中的电流值,且EDTA与重金属的络合提高了污染物向电极液的迁移效率,从而强化了电动力学修复效果。在设定的浓度(0、0.01、0.02、0.05和0.1 mol/L)中,0.1 mol/L的EDTA具有最佳的修复效率。在此实验条件下,污染土壤中的总铜、总铅和总镉的去除率分别为90.2%、68.1%和95.1%。电动力学修复后,对土壤重金属进行化学形态分析,发现电动力学修复显著改变了土壤重金属存在形态,修复后土壤中的铜、铅、镉主要以较稳定的有机态和残余态形式存在,显著降低了对周边生物和环境的毒害。 相似文献
12.
Using biochar for remediation of soils contaminated with heavy metals and organic pollutants 总被引:23,自引:0,他引:23
Xiaokai Zhang Hailong Wang Lizhi He Kouping Lu Ajit Sarmah Jianwu Li Nanthi S. Bolan Jianchuan Pei Huagang Huang 《Environmental science and pollution research international》2013,20(12):8472-8483
Soil contamination with heavy metals and organic pollutants has increasingly become a serious global environmental issue in recent years. Considerable efforts have been made to remediate contaminated soils. Biochar has a large surface area, and high capacity to adsorb heavy metals and organic pollutants. Biochar can potentially be used to reduce the bioavailability and leachability of heavy metals and organic pollutants in soils through adsorption and other physicochemical reactions. Biochar is typically an alkaline material which can increase soil pH and contribute to stabilization of heavy metals. Application of biochar for remediation of contaminated soils may provide a new solution to the soil pollution problem. This paper provides an overview on the impact of biochar on the environmental fate and mobility of heavy metals and organic pollutants in contaminated soils and its implication for remediation of contaminated soils. Further research directions are identified to ensure a safe and sustainable use of biochar as a soil amendment for remediation of contaminated soils. 相似文献
13.
14.
Cheng S 《Environmental science and pollution research international》2003,10(4):256-264
GOAL, SCOPE AND BACKGROUND: As one of the consequences of heavy metal pollution in soil, water and air, plants are contaminated by heavy metals in some parts of China. To understand the effects of heavy metals upon plants and the resistance mechanisms, would make it possible to use plants for cleaning and remediating heavy metal-polluted sites. METHODS: The research results on the effects of heavy metals on plants and resistant mechanisms are compiled from Chinese publications from scientific journals and university journals, mostly published during the last decade. RESULTS AND DISCUSSION: Effects of heavy metals on plants result in growth inhibition, structure damage, a decline of physiological and biochemical activities as well as of the function of plants. The effects and bioavailability of heavy metals depend on many factors, such as environmental conditions, pH, species of element, organic substances of the media and fertilization, plant species. But, there are also studies on plant resistance mechanisms to protect plants against the toxic effects of heavy metals such as combining heavy metals by proteins and expressing of detoxifying enzyme and nucleic acid, these mechanisms are integrated to protect the plants against injury by heavy metals. CONCLUSIONS: There are two aspects on the interaction of plants and heavy metals. On one hand, heavy metals show negative effects on plants. On the other hand, plants have their own resistance mechanisms against toxic effects and for detoxifying heavy metal pollution. RECOMMENDATIONS AND OUTLOOK: To study the effects of heavy metals on plants and mechanisms of resistance, one must select crop cultivars and/or plants for removing heavy metals from soil and water. More highly resistant plants can be selected especially for a remediation of the pollution site. The molecular mechanisms of resistance of plants to heavy metals should be studied further to develop the actual resistance of these plants to heavy metals. Understanding the bioavailability of heavy metals is advantageous for plant cultivation and phytoremediation. Decrease in the bioavailability to farmlands would reduce the accumulation of heavy metals in food. Alternatively, one could increase the bioavailability of plants to extract more heavy metals. 相似文献
15.
Effects of remediation train sequence on decontamination of heavy metal-contaminated soil containing mercury 总被引:1,自引:0,他引:1
Zeng-Yei Hseu Yu-Tuan Huang 《Journal of the Air & Waste Management Association (1995)》2014,64(9):1013-1020
When a contaminated site contains pollutants including both nonvolatile metals and Hg, one single remediation technology may not satisfactorily remove all contaminants. Therefore, in this study, chemical extraction and thermal treatment were combined as a remediation train to remove heavy metals, including Hg, from contaminated soil. A 0.2 M solution of ethylenediamine tetraacetic acid (EDTA) was shown to be the most effective reagent for extraction of considerable amounts of Cu, Pb, and Zn (>50%). Hg removal was ineffective using 0.2 M EDTA, but thermogravimetric analysis suggested that heating to 550°C with a heating rate of 5°C/min for a duration of 1 hr appeared to be an effective approach for Hg removal. With the employment of thermal treatment, up to 99% of Hg could be removed. However, executing thermal treatment prior to chemical extraction reduced the effectiveness of the subsequent EDTA extraction because nonvolatile heavy metals were immobilized in soil aggregates after the 550°C treatment. The remediation train of chemical extraction followed by thermal treatment appears to remediate soils that have been contaminated by many nonvolatile heavy metals and Hg.
ImplicationsA remediation train conjoining two or more techniques has been initialized to remove multiple metals. Better understandings of the impacts of treatment sequences, namely, which technique should be employed first on the soil properties and the decontamination efficiency, are in high demand. This study provides a strategy to remove multiple heavy metals including Hg from a contaminated soil. The interactions between thermal treatment and chemical extraction on repartitioning of heavy metals was revealed. The obtained results could offer an integrating strategy to remediate the soil contaminated with both heavy metals and volatile contaminants. 相似文献
16.
17.
Investigation of the removal of heavy metals from sediments using rhamnolipid in a continuous flow configuration 总被引:2,自引:0,他引:2
Heavy metal contamination of sediments is hazardous to benthic organisms and needs more attention in order to prevent entry of these heavy metals into the food chain. Biosurfactants have shown the capability to remove heavy metals from soils and sediments. The objective of this research was to evaluate the performance of rhamnolipid, a glycolipid biosurfactant, in a continuous flow configuration (CFC) for removal of heavy metals (copper, zinc, and nickel) from the sediments taken from Lachine Canal, Canada, to simulate a flow through remediation technique. In this configuration, rhamnolipid solution with a constant rate was passed through the sediment sample within a column. Important parameters such as the concentration of rhamnolipid and the additives, time and the flow rate were investigated. The removal of heavy metals from sediments was up to 37% of Cu, 13% of Zn, and 27% of Ni when rhamnolipid without additives was applied. Adding 1% NaOH to 0.5% rhamnolipid improved the removal of copper by up to 4 times compared with 0.5% rhamnolipid alone. This information is valuable for designing a remediation protocol for sediment washing. 相似文献