Groundwater monitoring for cement kiln dust disposal units in karst aquifers     

Wanfang Zhou  Barry F. Beck  Jie Wang  Arthur J. Pettit 《Environmental Geology》2007,52(4):761-777

Well-developed karst aquifers tend to be heterogeneous and consist of variable porosities. Groundwater monitoring and the associated data interpretations in such aquifers are often more complicated than porous medium aquifers. Collection of representative data in karst aquifers often requires monitoring at appropriately located wells and/or springs that are proven to connect to the groundwater system. Water samples are to be collected under different flow conditions, including base flow, high-flow, and low-flow. The sampling frequencies may vary from several months for base flows to minutes in response to recharge events. The groundwater monitoring program presented in this paper is for a cement kiln dust mono-fill site in a karst area of southern Indiana. Following dye tracing and extensive geophysical investigations, one spring was selected as a monitoring location. A second spring should be used as a monitoring location when the last cell of the mono-fill begins receiving the wastes. The paper discusses results from the first spring, at which nine background sampling events were completed to evaluate the natural variations of the water quality. Based on the background data, a statistical evaluation plan was developed for 12 water-quality parameters to determine the integrity of the landfill. The statistical power of the statistical analyses was evaluated by Monte Carlo simulations.  相似文献   

Geochemical characterisation and geophysical mapping of Landfill leachates: the Marozzo canal case study (NE Italy)   总被引：1，自引：0，他引：1  

N.?Abu-ZeidEmail author  G.?Bianchini  G.?Santarato  C.?Vaccaro 《Environmental Geology》2004,45(4):439-447

An integrated approach including geochemical analyses and geophysical investigations, aimed at characterizing the chemical composition of leachate and at highlighting the extent and magnitude of the plume in terms of spatial distribution is presented. The reason for the specific induced polarisation behaviour over landfills was not well understood. In this work we propose an explanation for this behaviour, which is being used to detect the presence of possible leaks and to track and delimit the pollution plume for several years.As a case study the example of an abandoned municipal solid waste landfill, located in Comacchio County, NE Italy, is presented, where the operative conditions for any resistivity monitoring method were to be excluded because of the high salinity of the phreatic aquifer.  相似文献   

Lined waste containment systems: a method for design and performance evaluation   总被引：1，自引：0，他引：1  

H. Akgün 《Environmental Geology》1997,30(3-4):209-214

 The objective in designing lining systems for the containment of the leachate generated within a landfill is the prevention of contamination of groundwater and surface waters. The technology involving the design of these systems has progressed to a point that the integrity of the containment can be relied on over the long term. Double-lined systems provide the additional benefit of being able to quantify the performance of the lining system through the detection of leakage through the upper liner. The difficulty, however, lies with the qualitative evaluation of the system. This paper addresses this issue and offers a practical approach for the design and evaluation of double-lined systems and the leakage that is detected. Received: 16 February 1996 · Accepted: 29 May 1996  相似文献   

Landfill site selection by using geographic information systems   总被引：3，自引：3，他引：3  

Başak Şener  M. Lütfi Süzen  Vedat Doyuran 《Environmental Geology》2006,49(3):376-388

One of the serious and growing potential problems in most large urban areas is the shortage of land for waste disposal. Although there are some efforts to reduce and recover the waste, disposal in landfills is still the most common method for waste destination. An inappropriate landfill site may have negative environmental, economic and ecological impacts. Therefore, it should be selected carefully by considering both regulations and constraints on other sources. In this study, candidate sites for an appropriate landfill area in the vicinity of Ankara are determined by using the integration of geographic information systems and multicriteria decision analysis (MCDA). For this purpose, 16 input map layers including topography, settlements (urban centers and villages), roads (Highway E90 and village roads), railways, airport, wetlands, infrastructures (pipelines and power lines), slope, geology, land use, floodplains, aquifers and surface water are prepared and two different MCDA methods (simple additive weighting and analytic hierarchy process) are implemented to a geographical information system. Comparison of the maps produced by these two different methods shows that both methods yield conformable results. Field checks also confirm that the candidate sites agree well with the selected criteria.  相似文献   

Testing the ability of bentonite-amended natural zeolite (clinoptinolite) to remove heavy metals from liquid waste   总被引：2，自引：0，他引：2  

K. Kayabalı  Hasan Kezer 《Environmental Geology》1998,34(2-3):95-102

 The design of environmentally sound liquid waste containment structures has become a crucial task in engineering applications due to ever increasing groundwater contamination from such sites. Construction of such structures usually requires a bottom liner of low hydraulic conductivity as part of the design. In order to reduce the hazards associated with liquid wastes including landfill leachate, bentonite-amended natural zeolite is proposed as an alternative to conventional earthen liners. Among many contaminants associated with liquid wastes, heavy metals are the most dangerous ones. This paper deals with determining the ability of natural zeolite to remove heavy metals from aqueous waste. For this purpose, crushed natural zeolite (clinoptinolite) is amended with commercial powdered bentonite to yield a soil mixture low in permeability and high in ion-exchange capacity. Leachate from a conventional landfill is used as the percolation fluid. Concentrations of certain heavy metals in the effluent fluid percolated through the bentonite-zeolite mixture are compared with that of initial leachate. The conclusion is reached that certain metals are efficiently removed from the influent solution by the soil matrix whereas some ions do not show significant reduction in concentration. This is attributed to high hydraulic conductivity of the bentonite-zeolite mixture.  相似文献   

垃圾卫生填埋结构对地质环境效应的控制研究   总被引：14，自引：0，他引：14  

张澄博 《地质灾害与环境保护》1999,(Z1)

通过大量的现场调查、室内外试验及综合分析,以多种手段较系统地研究了垃圾及其渗滤液成分组成与变化规律,填埋场的地理—地质条件,填埋结构单元的控制机理,填埋结构控制作用的数学模拟和垃圾卫生填埋结构优化设计系统及其应用。首先,根据实际调查资料的统计结果,论述垃圾成分受到生活水平、能耗结构、季节、地域等多种因素的影响,并分析垃圾产量和成分变化的一般规律。以试验和现场监测为基础,详细研究垃圾渗滤液成分的变化特征,探讨垃圾的分解过程,指出垃圾渗滤液成分具有以有机质及其分解产物为主的高浓度、强污染特性,总体上具有随时间呈负指数衰减的动态变化规律。结合成都长安垃圾填埋场,首次详细、系统地从试验和模型计算两方面研究填埋结构对地质环境效应的控制作用。控制作用体现在两个方面：一方面,是填埋结构的各个组成部分（衬里、垃圾层、填土层）能够有效地去除污染物质,由于填埋体类似于一个生物反应器,有机质发生生物降解,分解的终极产物（如ＮＨ＋４）可被填土层和衬里吸附;另一方面,通过改变衬里、填土层的厚度与密度,可以控制渗滤液在填埋体内的水动力条件,从而控制渗滤液下渗对地下水造成的污染。在试验结果的基础上,建立模拟模型,完整系统地研究渗滤液水头  相似文献   

Analysis of flow behavior in a landfill with cover soil of low hydraulic conductivity   总被引：2，自引：1，他引：1  

Y. -S Jang 《Environmental Geology》2000,39(3-4):292-298

 This paper presents the results of field tests of hydrologic parameters in a landfill and the results of numerical simulation to find the efficiency of the pumping method to reduce leachate levels in the landfill. The field hydraulic conductivity and storativity of waste and buried cover soils in the landfill are measured by pumping and slug tests. The hydrologic condition inside the landfill is first calibrated using the drawdown-time curve obtained from the pumping test, and the flow behavior of leachate during pumping in the landfill, when various layers of waste and buried cover soil exist, is analyzed through three-dimensional numerical simulation of flow. The results of the field investigation show that the buried cover soil of low hydraulic conductivity forms an impermeable layer preventing the downward flow of leachate and upward flow of landfill gas. The hydraulic conductivities of the pumping test and slug tests were quite close on the same order of magnitude. It was also possible to match the drawdown-time data of the field tests with those of the model using input data close to the hydrologic property obtained from the field tests. The numerical flow analysis showed that pumping was possible up to 120 tons/day for a single well without a drain, while the pumping rate could be increased to 300 tons/day for the same well with the drain. From the vertical section of the flow vector with a horizontal drain, the barrier role of buried cover soil is identified, which was proposed by examining the water contents of the disposed cover soil and waste in the field. Received: 15 May 1998 · Accepted: 4 January 1999  相似文献   

Landfill Barrier-Overview and Prospect     

Zheng Liange  Zhao Yongsheng 《世界地质(英文版)》2000,3(1)

Landfill is the primary method of waste disposal. The increasing attention focused on the effect of landfill on environment prompts the development of environmental sound landfill system. As the key parts of landfill, the barrier system can provide impermeabilization of leachate and prevent biogas from escaping intotheenvironment. In recent years, the technology pertaining the barrier system developed rapidly. In this paper, new materials used in liners and new concept of barrier construction are reviewed; the mechanisms of leachate through clay liner and geomembrane, the calculation of leaks through liner and the effect of freezing/thaw on liner are discussed.  相似文献   

Chemical composition of landfill leachate in a karst area with a Mediterranean climate (Marbella, southern Spain)   总被引：2，自引：0，他引：2  

I. Vadillo  F. Carrasco  B. Andreo  A. García de Torres  C. Bosch 《Environmental Geology》1999,37(4):326-332

 Between March 1994 and April 1997, the physical and chemical parameters and chemical composition of the urban solid waste leachate of the Marbella landfill (southern Spain) were determined. The data obtained show an ammonium and sodium chloride and bicarbonate type, a pH>7 and high mineralization, effectively described by the following parameters: Na⁺, K⁺, NH₄ ⁺, Cl^– and alkalinity. The chemical composition depends on the rainfall: in dry years, the mineralization and component concentrations have values as much as double those found in normal rainfall years. After storm events, a major and rapid dilution (within several hours) is seen in the leachate. Received: 28 January 1998 · Accepted: 2 June 1998  相似文献   

Characteristics and Fertilizer Effects of Soil‐Like Materials from Landfill Mining          下载免费PDF全文

Chuanbin Zhou  Wanying Xu  Zhe Gong  Wenjun Fang  Aixin Cao 《洁净——土壤、空气、水》2015,43(6):940-947

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