共查询到19条相似文献，搜索用时 125 毫秒
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周口北郊垃圾填埋场渗滤液的渗漏量及COD变化模拟分析 总被引：1，自引：0，他引：1
周口北郊垃圾填埋场为非卫生填埋,已对周围地下水环境造成了污染。在建立污染物溶出模式的基础上,分析了该非卫生填埋场垃圾渗滤液中化学需氧量(COD)的变化规律,用WHI UnSat Suite软件HELP模块估计了停止填埋后的现状和采用地表防渗措施情况下渗滤液的渗漏量。结果表明,周口北郊垃圾在10a垃圾填埋过程中每年有1 000～5 000m3渗滤液进入含水层,其COD质量浓度大致为2 000mg/L。停止垃圾堆放后,在没有覆盖措施条件下,渗滤液渗漏量平均值为2 500m3/a。在垃圾表层铺设防渗措施可有效减少99%的渗漏量,但仍有12m3/a渗滤液渗漏进入含水层。 相似文献
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垃圾填埋是目前处理城市生活垃圾普遍使用的方式,由此产生的垃圾渗滤液成为主要的地下水污染源.本文以上海市某生活垃圾填埋场作为研究对象,研究垃圾填埋对地下水的影响.通过监测该场地垃圾填埋前后2年内场区及周边地下水水质的变化情况,以垃圾填埋前调查区的地下水样品分析结果为本底值,采用本底法对地下水水质进行评价来判定地下水是否受到垃圾渗滤液的影响.评价结果显示,对于本研究的水质动态监测阶段,调查区内的浅层地下水水质暂未受到垃圾渗滤液的影响,个别监测井水质发生较大变化是由于填埋场施工建设过程中,破坏了监测井井盖及挖穿了井边含水层顶层.随着整个垃圾填埋场运行时间的延长,防渗漏措施的有效性以及垃圾渗滤液对周边地下水的影响还需要进一步研究. 相似文献
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天然与改性膨润土组合处理难生物降解垃圾渗滤液的实验研究 总被引：3，自引：0，他引：3
以北京市阿苏卫垃圾填埋场中晚期渗滤液为研究对象,通过正交实验的方法分析了改性土、原土、明矾、改性土加明矾等的用量及搅拌速度、搅拌时间、静置时间等因素对垃圾渗滤液CODcr去除率的影响。通过对改性土、原土、明矾处理垃圾渗滤液的机理进行分析后,将改性土、原土分别用来处理垃圾渗滤液中可溶性物质中的疏水性物质和亲水性物质,并结合明矾的絮凝作用组合处理垃圾渗滤液。处理后垃圾渗滤液CODcr值从4700mg/L明显下降到839mg/L,CODcr去除率为82.15%,BOD5从700mg/L下降到263mg/L,BOD5去除率为62.43%。有机改性膨润土、明矾、原土组合处理是一种有效的处理垃圾渗滤液方法。 相似文献
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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
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垃圾填埋技术是我国应用较广的垃圾处理技术,以某简易垃圾填埋场为例,查明研究区水文地质条件,通过计算得到垃圾渗漏液产生量及相关污染物浓度,选取合理预测参数,运用visual-modflow软件建立研究区地下水流场及地下水溶质运移模型,对研究区地下水相关污染因子进行预测,根据相关预测模型和参数,结果发现:该简易垃圾填埋场中氨氮污染距离可达536.4 m;高锰酸钾指数污染距离可达480.36 m,说明该简易垃圾填埋场渗滤液的泄漏已对下游一定区域的地下水环境造成了污染。 相似文献
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垃圾填埋场渗滤液水质复杂,危害性大,对其无害化处理尚未得到很好解决。研究发现,垃圾渗滤液中有机污染物可标识划分为亲水性和疏水性两大类物质。实验针对性采用亲水的天然膨润土处理亲水性有机物,疏水的有机膨润土处理疏水性有机物,再结合鸟粪石结晶法去除氨氮,从而获得一套处理中晚期垃圾渗滤液的经济高效的矿物法组合处理技术。采用GC-MS技术鉴定经矿物法处理后的垃圾渗滤液,亲水性和疏水性有机污染物的种类和含量都明显降低。检测进水与出水的COD、氨氮及重金属浓度这三项关键指标,垃圾渗滤液原液COD为2566 mg/L,氨氮3859 mg/L,重金属Hg为0.305 mg/L。矿物法组合处理后出水的COD为245mg/L,氨氮48 mg/L,重金属Hg未检出。矿物组合法为垃圾渗滤液的无害化处理提供了一条新的思路。 相似文献
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已关闭的淮南大通垃圾填埋场建场24 a,最大堆填高度为15 m,垃圾最大填埋龄期达24 a。通过钻孔获取不同深度的6个垃圾样,土工试验结果表明:填埋场内垃圾最小孔隙比为1.18,最大孔隙比为2.53,塑料和纸张类含量对试样孔隙比影响较大;经过24 a的扩散,渗滤液透过了10 m厚的天然致密粘土层而对地下水体产生了污染;实测填埋场垃圾体内气体中CH4的最高体积分数达2.8654%,CH4/CO2比值在0.773～1.79;填埋体内最高温度大约发生在垃圾进场40 d后,达到56℃。针对垃圾填埋场固液气热特性,提出了填埋场治理措施的建议。 相似文献
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在不同的环境条件下,以北京昌平小汤山的阿苏卫垃圾卫生填埋场渗滤液为研究对象,以COD、氨氮为评价指标,进行了赤泥吸附垃圾渗滤液中有害物质的实验,研究了赤泥的COD、氨氮吸附效果与其用量、渗滤液pH、温度、振荡时间的关系.实验表明,赤泥对氨氮有一定的吸附能力. 相似文献
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This paper studies a landfill where there are three faults running through. As serious pollution has occurred to the geological environment, the landfill is to be closed up and renovated. The paper aims to explore the role of fracture structure in leachate pollution at the landfill. The research was carried out in several stages. First, mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established. And then, the boundary conditions and parameters of the two mathematical models were determined. The groundwater level of the landfills was simulated in order to modify the two mathematical models. As a result, a feasible mathematical model was achieved. Based on this model, a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly, the impacts of the fracture structure on the pollution of leachate at the landfills could be identified. The study results show that while faults contribute to the migration of ieachate, they also serve as a confluence of leachate, thus further deteriorating the environment. The COD concentrations of the inside leachate and the outside leachate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post-renovation landfill. Therefore, measures must be taken to handle the ieachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control. 相似文献
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This paper studies a landfill where there are three faults running through.As serious pollution has occurred to the geological environment,the landfill is to be closed up and renovated.The paper aims to explore the role of fracture structure in leachate pollution at the landfill.The research was carried out in several stages.First,mathematical models of the pre-renovation landfill with three faults running through and the landfill after renovation were established.And then,the boundary conditions and parameters of the two mathematical models were determined.The groundwater level of the landfills was simulated in order to modify the two mathematical models.As a result,a feasible mathematical model was achieved.Based on this model,a comparison was made of the COD concentration variations in the inside leachate and outside leachate between the two landfills. Accordingly,the impacts of the fracture structure on the pollution of leachate at the landfills could be identified.The study results show that while faults contribute to the migration of leachate,they also serve as a confluence of leachate,thus further deteriorating the environment.The COD concentrations of the inside leachate and the outside leacbate of the pre-renovation landfill are respectively 800 mg/L and 220 mg/L higher than those of the post.renovation landfill.Therefore,measures must be taken to handle the leachate seepage in areas where there are faults as well as the neighboring areas so as to get the environmental pollution under control. 相似文献
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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
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The Nanjido Landfill is the largest uncontrolled landfill in Korea and it causes various kinds of environmental problems.
Landfill gases and leachate are recognized as the most serious environmental problems associated with the landfill. This study
employs a series of numerical models and uses test data to interpret the distribution and flow of landfill gases and leachate.
Leachate seepage appears about 40–60 m higher than the estimated basal groundwater table. Thus, seepage data indicate that
perched or floating leachate layers are formed in the unsaturated zone of the landfill. The leachate production rate is estimated
using infiltration test data and a model for unsaturated groundwater flow. Geochemical data indicate that the landfill leachate
degrades the basal groundwater quality along the downgradient zone. The environmental impact of the leachate on river water
is estimated.
Received: 17 June 1996 · Accepted: 2 October 1996 相似文献
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中温UBF与UASB两相厌氧系统处理垃圾渗滤液的实验研究 总被引：1，自引：0，他引：1
针对石碑岭垃圾场渗滤液水质特性,采用以高效生物陶粒为填料的UBF反应器作酸化相,以UASB反应器作甲烷相的两相厌氧系统进行了处理垃圾渗滤液的实验研究.实验结果表明:在系统进水CODCr和BOD5质量浓度分别为3 887 mg/L和819 mg/L,UBF与UASB的HRT分别控制在10.3 h和61.7 h时,CODCr和BOD5总去除率分别为85.4%和90.1%,UBF酸化率达42.9%,BOD5/CODCr比值由0.21提高到0.39. 相似文献
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J. Saetang S. Babel 《International Journal of Environmental Science and Technology》2009,6(3):457-466
This study focuses on treatment of landfill leachate in column experiments by immobilized Trametes versicolor on polyurethane foam, collected from Nonthaburi landfill site, Thailand. In this study, glucose was used as a co-substrate. The effect of biomass growth on color removal was observed by immobilizing fungi on polyurethane foam. The same immobilized fungi were used for four cycles of 5 days each to find the reuse of fungi. Leachate was diluted to see the effect of organic loading on color removal. At optimum pH of 4 and in 20 days with 3 g/L of glucose, the fungi could decolorize 78 % and 63 % for 5-times dilution and concentrated leachate, respectively, using immobilized fungi after 4 days initial growth. Fungi could also reduce biological oxygen demand and chemical oxygen demand of 52 % and 42 % (with initial biological oxygen demand and chemical oxygen demand of 48,900 and 96,512 mg/L), respectively, with glucose 3 g/L in concentrate leachate and with 4 days initial immobilization of fungi on polyurethane foam. About 1–6% higher color removal was observed on day 20 with 15 days fungi immobilization initially as compared to 4 days immobilization. Higher removal efficiency was observed for the same leachate after dilution due to reduction in organic loading. Addition of co-substrate enhances significantly removal of color, biological oxygen demand and chemical oxygen demand. Chemical oxygen demand removal reached to 0.6 mg/mg of biomass with the co-substrate. Therefore, white rot fungi can be considered as potentially useful microorganisms in landfill leachate treatment. 相似文献
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垃圾填埋场抽水试验及降水方案设计 总被引：2，自引：0，他引：2
垃圾填埋场中的渗滤液水位过高会引发一系列环境和稳定问题,工程上可用竖井抽水降低渗滤液水位。通过在填埋场现场进行抽水试验,确定垃圾土的渗透系数和抽水影响半径,在此基础上对填埋场降水的瞬态流问题进行有限元模拟,分析了抽水井口径和间距对填埋场降水的影响,提出了降水方案的设计步骤和方法。抽水试验表明,现场垃圾的渗透系数约为3.6×10-4cm/s,抽水影响半径约为20m。数值分析表明,井径的变化对于降水效果影响不大,而合理选择抽水井间距对降水十分关键。进行抽水方案设计时,应首先根据工期和降水幅度要求计算井间距,按井的出水速度选择水泵,再根据水泵确定井径,最后根据井径和过滤层形式确定钻孔尺寸并选择钻机。 相似文献
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环境污染造成地下结构侵蚀劣化,使得地下结构面临严峻的长期稳定性问题。通过50 g/L Na2SO4溶液、50 g/L NaCl溶液以及含有50 g/L Na2SO4 + 50 g/L NaCl的垃圾渗滤液的浸泡侵蚀试验,研究了经上述溶液侵蚀后混凝土试样在不同围压下的气体渗透特性、氯离子渗透特性以及力学特性。结果表明：（1）经不同溶液侵蚀后试样的渗透率与所承受的围压大小密切相关。同一侵蚀时间下,随着围压的增大,渗透率逐渐减小。经垃圾渗滤液侵蚀后的试样渗透率随侵蚀时间线性增加,且围压越小,增大的速率越大;经硫酸钠溶液、氯化钠溶液侵蚀后的试样渗透率总体先减小后增大;经3种不同溶液侵蚀后,试样渗透率对应力的敏感程度均有所提高。（2）经3组溶液侵蚀后试样单轴抗压强度变化分为线性增加、缓慢下降两个阶段,但垃圾渗滤液侵蚀后的试样强度始终为最小值。弹性模量也呈现出相似的变化规律。（3）在同一侵蚀深度处,垃圾渗滤液侵蚀后的试样自由氯离子含量比氯化钠溶液侵蚀后的试样低20%～50%,垃圾渗滤液侵蚀下混凝土试样被氯离子侵蚀的程度比氯化钠溶液侵蚀下混凝土试样低。（4）气体渗透率随侵蚀的进行而变化最为明显,比单轴抗压强度、氯离子扩散系数更适用于评价地下混凝土结构长期稳定性。研究结果可为侵蚀性环境下地下结构长期稳定性分析提供理论依据。 相似文献