共查询到16条相似文献,搜索用时 93 毫秒
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用生物滴滤床处理H2S和挥发性有机物混合废气 总被引:6,自引:1,他引:6
用生物滴滤床(BTF)处理某化工厂污水站的H2S和挥发性有机物(VOCs)混合废气,当废气中H2S质量浓度为120~400mg/m^3、VOCs质量浓度为115~340mg/m^时,运行稳定后H2S和VOCs的去除率为95%和85%。考察了影响BTF运行的循环水水质情况,试验结果表明:加入Na2CO3可使循环水pH控制在3~6;循环水中含盐量、Cl^-质量浓度和SO4^2-质量浓度分别为2200~3300,600~800,1200~1400mg/L,均未达到抑制微生物的水平。 相似文献
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石化企业中间罐区VOCs排放量较大,多采用吸收、冷凝、膜分离及其组合工艺进行处理。本文采用AspenPlus软件分别对高、中、低浓度中间罐区VOCs废气应用上述3种工艺及其工艺组合的处理效果进行模拟计算。结果表明:中间罐区的VOCs经过不同组合的二级处理后,尾气VOCs质量浓度约为9~50 g/m~3,后续仍需采用深度处理工艺以满足新的国家及地方污染物排放标准要求;同时,对比3种工艺能耗情况,冷凝法最低,膜分离法次之,吸收法最高,约为冷凝法能耗的5~10倍。以上模拟计算结果与实际工况数据基本符合,证明采用Aspen Plus软件进行石化企业中间罐区VOCs治理工艺选择与流程优化是可行的,具有一定的参考价值。 相似文献
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总结了实测法、物料衡算法、模型法、排放系数法、工程估算法等国内外石化废水挥发性有机物(VOCs)逸散量估算方法的主要特点及适用范围。应用排放系数法和实测法估算国内某石化厂废水收集处理系统VOCs逸散量为354.26 t/a。根据估算方法的实际应用研究,建议物料衡算法中废水油相VOCs逸散可结合油相敞口面积和油相性质,提供废水油相的排放系数;应用Water 9软件估算含油膜废水设施逸散量时,应单独估算油膜VOCs逸散量;建议排放系数法中废水收集系统排水口、检查井未密闭VOCs排放系数均确定为0.032 kg/h(每个逸散源),废水处理系统油水分离器、气浮装置按进水中石油类浓度的大小,分别提供VOCs排放系数。 相似文献
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将青霉素菌渣在400~700 ℃进行热解,研究了产物中热解炭、热解油及气体的产率,以及热解油的组成变化。实验结果表明:600 ℃时热解油产率最高,随着温度升高,热解炭的产率降低,气体的产率升高;热解油中含量最高的是含氧化合物,在400 ℃时质量分数达到最高值69.69%,含氧化合物的含量随着热解温度的升高而降低,酸和醇类是热解油中含量最多的含氧化合物;含氮有机化合物的质量分数随着热解温度的升高而升高,在700 ℃时达到最高值30.64%,酰胺、吡啶、吲哚、含氮杂环是主要的含氮有机化合物。 相似文献
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泄漏检测与修复(LDAR)是国际上通用的减少石化行业VOCs无组织排放的技术方法。在对天津市60套石化化工装置进行LDAR核查评估及专家咨询的基础上,将层次分析法(AHP)与模糊综合评价法(FCE)相结合,建立了一个4层次24个指标的评估指标体系,通过AHP确定指标权重,利用FCE进行模糊综合评分。以甲、乙两石化企业为例进行LDAR评估指标体系的验证,结果表明,该指标体系评估结果与实际LDAR核查评估结果一致,具有良好的实际应用价值。 相似文献
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综述了VOCs的来源以及我国VOCs治理的相关政策法规。介绍了冷凝、吸收、吸附-脱附、膜分离、生物法、等离子体法、光催化法、热氧化法等主要的VOCs治理技术各自的特点。概述了中国石化合成橡胶装置尾气VOCs治理项目建设情况。中国石化在“十三五”期间累计投入6亿元,实施合成橡胶装置尾气治理项目14个,到“十三五”末,所有合成橡胶装置的尾气均能实现达标排放。 相似文献
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Biological processes have been used to remediate petroleum hydrocarbons, pesticides, chlorinated solvents, and halogenated aromatic hydrocarbons. Biological treatment of contaminated soils may involve solid-phase, slurry-phase, or in situ treatment techniques. This article will review the general principle of solid-phase bioremediation and discuss the application of this technique for the cleanup of total petroleum hydrocarbons on two sites. These remedial programs will reduce total petroleum hydrocarbon contamination from the mean concentration of 2,660 ppm to under the 200-ppm cleanup criteria for soil and under the 15-ppm cleanup criteria for groundwater. Over 32,000 yards of soil have been treated by solid-phase treatment to date. The in situ system operation is effectively producing biodegradation in the subsurface. The project is approximately one-third complete. 相似文献
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Low-temperature thermal aeration (LTTA) is a remedial technology developed by Canonie Environmental Services Corp. (Canonie) for use on soils containing nonchlorinated hydrocarbons, chlorinated solvents, volatile organic compounds (VOCs), chlorinated pesticides, and low levels of polynuclear aromatic hydrocarbons (PAHs). The LTTA system separates these hazardous constituents from excavated soils and allows the treated soils to be redeposited on-site without restriction. This article describes the various components and operation of LTTA systems for the remediation of soils contaminated with chlorinated and nonchlorinated constituents. The article also details the results of projects completed to date, principally for soil impacted with chlorinated hydrocarbons, and discusses the general characteristics and results of systems used for soils contaminated with nonchlorinated hydrocarbons (gasoline, etc.). 相似文献
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Thomas Dominguez Johanna Aurell Brian Gullett Robert Eninger Dirk Yamamoto 《Journal of Material Cycles and Waste Management》2018,20(2):902-913
Emissions from open burning of military food waste and ration packaging compositions were characterized in response to health concerns from open burning disposal of waste, such as at military forward operating bases. Emissions from current and prototype Meals, Ready-to-Eat (MREs), and material options for their associated fiberboard packaging were quantified to assess contributions of the individual components. MREs account for 67–100% of the particulate matter (PM), volatile organic compounds (VOCs), polycyclic aromatic hydrocarbons (PAHs), and polychlorinated dibenzo-p-dioxins and -furans (PCDDs/PCDFs) emissions when burned in unison with the current fiberboard container and liner. The majority of the particles emitted from these burns are of median diameter 2.5 µm (PM2.5). Metal emission factors were similar regardless of waste composition. Measurements of VOCs and PAHs indicate that targeted replacement of MRE components may be more effective in reducing emissions than variation of fiberboard-packaging types. Despite MRE composition variation, equivalent emission factors for PM, PAH, VOC, and PCDD/PCDF were seen. Similarly, for fiberboard packaging, composition variations exhibited essentially equivalent PM, PAH, VOC, and PCDD/PCDF emission factors amongst themselves. This study demonstrated a composition-specific analysis of waste burn emissions, assessing the impact of waste component substitution using military rations. 相似文献
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Atmospheric emissions and attenuation of non-methane organic compounds in cover soils at a French landfill 总被引:1,自引:0,他引:1
Scheutz C Bogner J Chanton JP Blake D Morcet M Aran C Kjeldsen P 《Waste management (New York, N.Y.)》2008,28(10):1892-1908
In addition to methane (CH(4)) and carbon dioxide (CO(2)), landfill gas may contain more than 200 non-methane organic compounds (NMOCs) including C(2+)-alkanes, aromatics, and halogenated hydrocarbons. Although the trace components make up less than 1% v/v of typical landfill gas, they may exert a disproportionate environmental burden. The objective of this work was to study the dynamics of CH(4) and NMOCs in the landfill cover soils overlying two types of gas collection systems: a conventional gas collection system with vertical wells and an innovative horizontal gas collection layer consisting of permeable gravel with a geomembrane above it. The 47 NMOCs quantified in the landfill gas samples included primarily alkanes (C(2)-C(10)), alkenes (C(2)-C(4)), halogenated hydrocarbons (including (hydro)chlorofluorocarbons ((H)CFCs)), and aromatic hydrocarbons (BTEXs). In general, both CH(4) and NMOC fluxes were all very small with positive and negative fluxes. The highest percentages of positive fluxes in this study (considering all quantified species) were observed at the hotspots, located mainly along cell perimeters of the conventional cell. The capacity of the cover soil for NMOC oxidation was investigated in microcosms incubated with CH(4) and oxygen (O(2)). The cover soil showed a relatively high capacity for CH(4) oxidation and simultaneous co-oxidation of the halogenated aliphatic compounds, especially at the conventional cell. Fully substituted carbons (TeCM, PCE, CFC-11, CFC-12, CFC-113, HFC-134a, and HCFC-141b) were not degraded in the presence of CH(4) and O(2). Benzene and toluene were also degraded with relative high rates. This study demonstrates that landfill soil covers show a significant potential for CH(4) oxidation and co-oxidation of NMOCs. 相似文献