共查询到18条相似文献,搜索用时 109 毫秒
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浓缩液回灌对垃圾填埋体水位及稳定性的影响 总被引:3,自引:0,他引:3
成都长安填埋场渗滤液反渗透处理工艺日产260 t浓缩液,拟在填埋场进行回灌处理,回灌工程实施前需评估回灌工程对垃圾填埋体稳定性的影响.在该填埋场工程地质与水文地质勘查结果的基础上,利用GMS软件开展了垃圾填埋体非饱和一饱和三维渗流分析,模拟和预测了浓缩液回灌前后填埋体内渗滤液水位变化.基于渗流分析结果,利用Slope/... 相似文献
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为考察锯末对垃圾渗滤液的减量作用以及在垃圾中添加锯末对其降解速率以及渗滤液中COD和NH3-N浓度的影响,在实验室构建了三个圆柱形垃圾厌氧填埋反应器,用于模拟垃圾填埋场的运行情况,并对垃圾渗滤液的产生量、垃圾层沉降高度、渗滤液中COD和NH3-N的浓度进行了监测。结果表明:锯末具有很强的减少垃圾渗滤液产量和加速垃圾降解的作用,在垃圾层中混合添加锯末能使每升垃圾的渗滤液产生量在180d内减少1200~1300mL,垃圾层高度比不添加锯末时多沉降了5cm;添加锯末后垃圾渗滤液中的COD浓度有所降低;锯末对NH3-N有一定的吸附作用。 相似文献
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垃圾填埋场渗滤液处理技术及应用 总被引:3,自引:0,他引:3
垃圾在填埋场的填埋过程中,会产生对公众健康和周围水源生态环境构成极大污染威胁的高浓度渗滤液。渗滤液水量变化大,水量的变化导致水质的大幅度变化。随填埋年限的增加,渗滤液的水质将发生相应变化。渗滤液中包括大量的铵、氮和各种溶解态的阳离子、重金属、酚类、丹宁、可溶性脂肪酸及其他有机污染物。针对渗滤液的水质特征,主要采取物理化学法、生物处理法和回灌法等处理工艺。贵阳高雁城市生活垃圾卫生填埋场采用升流式厌氧污泥床反应器(UASB)及A/O生物膜接触氧化法的组合工艺进行处理,出水水质满足GB16889-1997的二级标准要求。 相似文献
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渗滤液回灌不仅能处理渗滤液、节约费用和保护环境,而且加速了填埋场稳定化,增加了产气率。以上海某填埋场四期工程为计算模型,本文考虑垃圾土沉降导致的成层性,运用SEEP/W有限元软件模拟渗滤液喷洒回灌。垃圾土在自重作用下会产生较大的沉降变形,导致垃圾土的孔隙率随深度变化,残余含水量、饱和含水量及饱和渗透系数也随之变化。在数值模拟中,以VGM(van-Genuchten-Mualem)函数描述垃圾土渗透系数与基质吸力关系,以流量边界模拟填埋场顶部、底部的渗滤液回灌和导排,分析了回灌过程中渗滤液的饱和-非饱和渗流情况,进而探讨了垃圾土成层性、回灌强度和排水流量对渗滤液运移规律的影响。 相似文献
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在分析渗滤液自身回灌存在问题的基础上 ,对目前出现的渗滤液循环 (间接 )回灌工艺进行了综述 ,并对有渗滤液处理设施的填埋场和新建填埋场渗滤液回灌的运行方式进行了探讨 相似文献
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ABSTRACTThis work investigates the effect of adding Cerium oxide nanoparticles at different proportions (30, 60 and 90?ppm) to Calophyllum inophyllum methyl ester and diesel blends (20% CI methyl ester and 80% diesel) in a four-stroke single-cylinder diesel engine. Addition of nanoparticles is a strategy to reduce emission and to improve the performance of the biodiesel. Modified fuels are introduced into the engine by admitting exhaust gas recirculation (EGR) at a rate of 10% and 20% so as to reduce nitrogen oxide (NOX) emissions from biodiesel and diesel blends. Results revealed a significant reduction in emissions (CO, NOX, HC and Smoke) at a 10% EGR rate. However, brake thermal efficiency is reduced with an increase in brake-specific fuel consumption at higher EGR rates. Hence, it is observed that 10% EGR rate is an effective method to control the emission of biodiesel and diesel blends without compromising much on engine efficiency. 相似文献
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高压旋喷桩在地下连续墙槽壁加固中的应用 总被引:1,自引:1,他引:0
主要论述了高压旋喷桩加固技术在苏州火车站改造工程地下连续墙槽壁加固中的设计、施工,分析阐述了该技术在地下连续墙槽壁加固工程中的工作机理,工程实践表明,高压旋喷桩是解决地下连续墙槽壁加固的很好方法,具有相当广泛的应用前景。 相似文献
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以规模为100 t/d的某生活垃圾填埋场渗滤液处理工程为依托,开发了有效的渗滤液回灌结构,最大水力负荷达0.45 m3/(m2·d).设计了单层间歇曝气、双层间歇曝气、连续曝气3种微氧运行工况,分析了不同水力负荷、曝气负荷对渗滤液中COD、NH3-N去除效果的影响.结果表明:最佳间歇微氧渗滤液回灌运营工况是单层间歇曝气,其中水力负荷为0.45 m3/(m2·d)、曝气负荷为6.75 m3风量/(m3垃圾·d).回灌处理出水水质稳定,受进水浓度影响较小,出水COD<1 500 mg/L、NH3-N<900 mg/L,最低出水NH3-N达400 mg/L.该负荷条件下加大曝气量,如双层间歇曝气、连续曝气对COD的去除效果影响不大,对NH3-N的去除效果略有提高. 相似文献
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The present research work focuses on the influence of exhaust gas recirculation (EGR) on the characteristics of the diesel engine operated with 20% tamarind seed methyl ester (TSME 20) as the renewable fuel. The use of TSME 20 as biodiesel results in closer performance characteristics with diesel fuel. However, TSME 20 biodiesel blend generated higher oxides of nitrogen (NOX) emissions at all operating conditions. Firstly, tests are performed using diesel and TSME 20 biodiesel blend at constant speed under different loads. Thereafter, experiments are conducted on TSME 20 with EGR rates at different concentrations. The test results revealed that with TSME 20 with 20% EGR rate, NOX emissions are reduced by 45.67% and 52.69% when compared to diesel and TSME 20. However, there is a slight reduction in brake thermal efficiency. Hence, the use of 20% EGR rate to TSME 20 is an optimum approach for better control of NOX emissions.Abbreviations BDC: bottom dead centre; BMEP: brake mean effective pressure; BSFC: brake-specific fuel consumption; BTE: brake thermal efficiency; CO: carbon monoxide; CO2: carbon dioxide; EGR: exhaust gas recirculation; FSN: filter smoke number; HC: hydrocarbon; kWh: kilo Watt hour; NOX: oxides of nitrogen; ppm: parts per million; SO: smoke opacity; TDC: top dead centre; TSME: tamarind seed methyl ester; TSME 20: 20% tamarind seed methyl ester; TSME 20–20%: tamarind seed methyl ester with 80% diesel; TSME 10% EGR: TSME 20 with 10% exhaust gas recirculation; TSME 20% EGR: TSME 20 with 20% exhaust gas recirculation; TSME 30% EGR: TSME 20 with 30% exhaust gas recirculation 相似文献