某垃圾场渗滤液在地下水中迁移扩散模拟研究

拟建的某填埋垃圾场位于四川盆地西部,垃圾场运行中产生的渗滤液必将对周围环境造成一定影响.本次模拟运用Visual ModFlow软件对渗滤液在地下水中的迁移扩散进行模拟研究,研究结果表明:正常情况下,污染物在一定范围内扩散和运移,影响距离及浓度都较小,不会迁移至附近地表水系。而对渗滤液事故情况下,污染影响范围广,浓度大,持续时间长。

基于MODFLOW的某垃圾场渗滤液污染模拟研究

某填埋垃圾场位于辽宁东部,分别在1980、2011年在上下游位置修建2个垃圾场,运行中产生的渗滤液必将对周围环境造成一定影响。文章对极端情况下渗滤液在地下水中的迁移扩散进行模拟研究,分析对隧洞的影响,判断影响范围是否在防护范围内(1#、2#支洞之间),为隧洞防护范围方案的制定提供理论依据。研究结果表明:污染物在一定范围内扩散和运移,影响距离及浓度都较小,污染物运移在隧洞防护范围内。为污染物运移模拟分析提供重要参考。

哈尔滨程家岗垃圾场垃圾渗滤液对周边土壤污染状况的调查

以哈尔滨程家岗垃圾处理场为研究对象,取该场地地面坡降方向、垂直坡降方向以及土层剖面垂直方向的土壤样品,对其进行分析评价。结果表明,程家岗垃圾场周围土壤已被垃圾渗滤液污染,沿坡降方向的污染程度大于垂直坡降方向的污染程度,且污染程度在垂直面随深度增加而减小。

垃圾填埋场渗滤液污染地下含水层及修复过程的三维动态监测实验

为实现垃圾填埋场渗滤液在地下含水层中动态扩散及污染层修复过程的实时监测,利用自行设计的三维电学观测系统开展了室内相关监测实验.实验表明渗滤液在含水层中的扩散过程会引起不同时期实测电剖面上低阻异常区的动态变化.对比分析这种变化特征可确定渗滤液扩散区的污染程度、扩散速度及扩散方向.在注水修复过程中,扩散区污染物含量的降低会引起对应区域实测视电阻率值的升高和异常区范围的变化.实验结果对于实现垃圾渗滤液污染地下含水层现状调查及动态监测具有重要意义.

Influence of Calcination Temperature on TiO_2 Nanotubes’Catalysis for TiO_2/UV/O_3 in Landfill Leachate Solution

The influence of calcination temperature on TiO2 nanotubes＇ catalysis for TiO2/UV/03 was investigated. TiO2 nanotubes （TNTs） were prepared via the sol-gel method and calcined at 300--700 ℃, which were labeled as TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700, respectively. TNTs were characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. It is found that TNTs calcined at 400 ℃ showed the best thermal stability. When the calcination temperature increased from 400 ℃ to 700 ℃, the special structure of tubes was destroyed and gradually converted into nanorods and/or particles. The transformation from anatase to rutile occurred at 600 ℃, and the rutile phase was enhanced when the calcination temperature was increased to over 600 ℃. The calcina- tion temperature＇s influence on TNTs＇ adsorption activity for for TiO2/UV/O3 was investigated in landfill leachate solution chemical oxygen demand （COD） and catalytic activity In landfill leachate solution, the adsorption activity of COD decreased in the reduced order of TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700. In photocatalytic ozonation, TNTs-400 showed the best catalytic activity while TNTs-700 exhibited the worst. In other three processes, the COD removal of TNTs-300/UV/O3 was higher than those of TNTs-500/UV/O3 and TNTs-600/UV/O3 in the first 20 rain, and then became close to those of the latter two in the following 40 rain. Compared with TNTs-300 and TNTs- 400, TNTs-600 had the best anti-fouling activity, while TNTs-500 and TNTs-700 had lower anti-fouling activity than the former three. In photocatalytic ozonation, the calcination temperature of 400 ℃ was appropriate when TNTs were obtained at the synthesis temperature of 105 ℃.

Analysis of pollutant components in landfill leachate from hinterland landfill in Three Gorge Water Reservoir

This paper mainly discusses the protection of water resource environment in Three Gorge Water Reservoir, a systematic investigation and analysis of the landfill leachate＇s polluting components, hazardous and changing rule in landfill leachate from hinterland landfill located in the surrounding area have been carried out, and proposed the countermeasures for disposition the leachate furtherly.

Characterization of Indigenous and Adapted Hydrocarbon Degrading Bacteria Isolated from Landfill Leachate from Ain Temouchent Engineered Landfill, Algeria

One of the most important issues regarding the design of engineered landfill is landfill leachate that is produced when water passes through the waste. Landfill Leachate comprises a mass of different organic and inorganic components which can be dissolved or suspended. Regardless of the nature of the components, it poses a potential pollution on local land and surface waters. The present work was undertaken to assess, isolate, identify and characterize the hydrocarbon degrading bacteria associated with environmental samples collected from discharge of Ain Temouchent, Algeria. The samples （landfill leachate） were chemically and microbiologically analyzed using standard techniques. These organisms were further studied to determine the level of biodegrading activities on hydrocarbons as the single carbon source using enrichment medium under different physical and chemical parameters （pH, temperature, NaCI and tolerance of crude oil...）, The identification of seven strains isolated named as Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudornonas sp., Staphylococcus aureus, Staphylococcus xylosus, Staphylococcus hominis and Staphylococcus warnerii. These strains growth on a neutral medium and temperature between 30 ℃ and 37 ℃, 5 at 6% of NaCI concentration, and can use a concentration of 5 at 10% of crude oil as sole source of carbon.

Effect of Leachate Recirculation on Characteristics of Leachate Generation of Municipal Solid Waste from Landfill Lysimeter

The objectives of this study are to determine the characteristics of leachates generated from landfill lysimeters of municipal solid waste. Two lysimeters with diameter and height of 0.70 and 2.40 m, respectively, were prepared. The lysimeters were operated with and without leachate recirculation. The leachate produced were quantified and characterised every day for the quantity, pH and ORP （oxidation reduction potential）. Meanwhile, the BOD and COD parameters were characterised every once week. Based on the data of experimental results that the lysimeter with a recirculation gave positive effects on the degradation of waste in landfills, that is the degradation process becomes faster. This is indicated by the quantity and quality of leachate generated. The lyisimeter conducted with recirculation of leachate shew the quantity of leachate generated larger than the lysimeter without recirculation. While the quality of the leachate includes pH, ORP, made it shown that the degradation process is faster. These results operations, especially for young waste. BOD and COD indicate that leachate recirculation on lysismeter suggest that leachate recirculation can be performed on landfills