共查询到17条相似文献,搜索用时 218 毫秒
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地下水污染修复中的PRB技术研究 总被引:1,自引:0,他引:1
PRB——渗透反应墙技术是近年来广泛应用的一种地下水污染修复技术。文中介绍了其基本概念、基本原理、结构类型、安装要素和主要材料选取。该技术在我国具有良好的应用前景。 相似文献
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针对垃圾填埋场渗滤液渗漏造成土壤及地下水等环境污染及其修复技术等问题,提出由环境友好型材料雾化钢渣(PS球)和废旧轮胎橡胶构建双层生物可渗透活性反应墙系统(DBPRBs),通过可行性分析表明该系统具有生物-非生物强化协同去污能力,该新型系统的构建和研究成果将进一步揭示污染地下水的PRB修复机理,对我国地下水污染的PRB修复产业发展具有重要的理论意义和实用价值。 相似文献
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在总结近年来国内外铀矿区地下水污染治理与修复技术最新进展和已有成果的基础上,评述物理化学修复
技术,生物修复技术及可渗透反应墙技术基本理论、实际案例和未来发展前景。当前铀矿区地下水污染的原位治
理与修复技术以实验室研究为主,缺乏对实际铀矿区地下水污染治理与修复的工程实践,如何结合实际铀矿区水
文地质条件和污染特征开发绿色、高效、低碳的治理与修复技术,是未来铀矿区地下水污染治理修复的重要发展
方向。 相似文献
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通过对凹凸棒石进行湿法提纯和酸处理改性提高凹凸棒石的纯度、比表面积和吸附性能;将提纯改性后的凹凸棒石作为载体,以硼氢化钾作为还原剂,在氩气保护下采用离子交换法制备凹凸棒石纳米铁复合材料,解决纳米铁稳定性差、容易凝聚成团的问题,从而增大纳米铁与污染物反应的有效面积。与纳米铁相比,凹凸棒石纳米铁复合材料较稳定,易于保存。以地下水中常见的硝酸盐为目标污染物,探讨了将凹凸棒石纳米铁复合材料应用到可渗透反应墙技术、抽出处理技术及注入修复技术中的方法。应用研究成果表明,经上述技术处理后,地下水硝酸盐浓度可得到有效去除。 相似文献
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为解决地下水硝酸盐污染问题,固相反硝化技术成为近年来的研究热点。基于固相反硝化的原理,归纳常用固相碳源种类及其优缺点,分析固相反硝化过程中的影响因素,并阐述固相反硝化技术在生物反应器、可渗透反应墙及人工湿地反应器中的应用。总结并展望固相反硝化技术在修复地下水硝酸盐污染中的问题及今后的研究方向,以期为地下水硝酸盐的修复工作提供借鉴。 相似文献
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地下水硝酸盐污染原位微生物修复技术研究进展 总被引:2,自引:0,他引:2
对于地下水中硝酸盐污染,原位微生物修复技术是一种有发展潜力、效率高且投资少的环境修复技术。但是这种技术也受一些因素的限制。对渗透反应墙技术进行了回顾,讨论了该技术中的有机碳源、电子供体和反硝化细菌的固定等问题,用实例说明应用该技术时需要注意的问题和监测参数,对注射井技术修复地下水硝酸盐污染进行了简单讨论。最后指出,应用微生物法修复地下水硝酸盐污染时要注意细菌污染和修复过程中含水层的渗透性降低或堵塞问题,应加强对治理大面积地下水硝酸盐污染在经济和技术上的可行性论证和研究。 相似文献
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Ha I Chung 《Water science and technology》2007,55(1-2):329-338
A series of laboratory experiments involving simple, ultrasonic, electrokinetic, electrokinetic/ ultrasonic flushing test were carried out for treatment and removal of heavy metal and hydrocarbon from contaminated groundwater in sandy layers under a river bank. The test results show that the electrokinetic/ultrasonic flushing technique is most effective for the removal of heavy metal and hydrocarbon from contaminated sandy layers by the coupling action of their own phenomena. It is shown that the electrokinetic technique is most effective to enhance the removal efficiency of heavy metal contaminants such as cadmium from contaminated sandy soil under the river bank; on the other hand the ultrasonic technique is most effective to enhance the removal efficiency of hydrocarbon contaminant, such as diesel fuel from contaminated soil. 相似文献
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Highly efficient, versatile, adsorbent, nanoscale zero-valent iron (NZVI) was synthesised and encapsulated by an anionic polymer to make it a mobile delivery vehicle (DV-NZVI) for in-situ groundwater and soil remediation. NZVI was found to be highly dispersed with surfactant within a size of 1-100 nm. Laboratory column experiments were conducted by employing glass beads as a porous medium to delineate the characteristics of DV-NZVI transport as a reactive material in saturated zones under a number of conditions. It was observed that there was an optimum concentration of polymer, i.e. 6 g/L, for maximum transport of DV-NZVI, at which point, as the flow rate increases, the transport of DV-NZVI increases. Similarly, at the optimum concentration we observed that as the depth of porous media increased, the breakthrough of DV-NZVI was retarded. These results confirmed that DV-NZVI has significant potential for use as a colloidal reactive barrier material in deep groundwater systems in lieu of pump and treat approaches and conventional permeable reactive barriers (PRB). 相似文献
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地下水石油污染治理的水力截获技术及数值模拟 总被引:20,自引:3,他引:20
本文首先分析了地下水中石油类污染的时空分布规律,在此基础上,布置了水力截获工程.水力截获带运行后的结果表明,水力截获技术可以去除地下水中的部分石油类污染物.另外,还对水力截获带运行期间地下水中石油类污染物的运移做了数值模拟,特别是对污染源切断前后地下水中石油类污染物的时空分布规律进行了预测.最后,得出如下结论:(1)查清研究区的水文地质条件是布置治理工程的前提,(2)切断污染源是有效治理的关键. 相似文献
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纳米级零价铁修复重金属污染水体的研究进展 总被引:2,自引:0,他引:2
近几年的研究表明,纳米级零价铁材料成为目前环境污染修复技术中一个非常活跃的研究领域。本文介绍了纳米级零价铁去除水体中重金属污染物的种类、反应动力学和机理,总结了当前几种比较简便实用的纳米铁制备和稳定化处理方法及纳米铁在环境修复中应用研究的热点和最新进展。最后,探讨了目前纳米铁在水体重金属污染修复研究和实际应用中存在的问题和研究方向,以期为我国重金属污染水体修复技术的开发提供借鉴。 相似文献
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The reconstruction of the source release history for groundwater contamination provides useful environmental forensic information in identifying the responsible parties for a contaminant plume at a known source location if its owner changed several times in the past. The objective of this study is to develop a novel method consisting of function-fitting technique, simulated annealing, and a fundamental solution of the contaminant transport equation given in AT123D (Yeh, 1981) to recover the source release history of a groundwater contamination. AT123D is an analytical model for simulating transient, one-, two-, and three-dimensional groundwater contaminant transport in aquifer systems. The method developed herein is for recovering the release history of a continuous and finite release duration source and therefore can handle a great variety of realistic problems. Cases with various types of source geometry and aquifer configuration are considered. The influence of contaminant biodegradation, degree of dispersion, location of monitoring well, use of temporal concentration data or spatial concentration data, and presence of two contaminated sources are also investigated. Finally, a few guidelines for the optimal sampling strategy on the reconstruction of the source release history are recommended. 相似文献