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Experimental study on filtration and continuous regeneration of a particulate filter system for heavy-duty diesel engines 总被引:1,自引:0,他引:1
This study investigated the filtration and continuous regeneration of a particulate filter system on an engine test bench, consisting of a diesel oxidation catalyst(DOC) and a catalyzed diesel particulate filter(CDPF). Both the DOC and the CDPF led to a high conversion of NO to NO2 for continuous regeneration. The filtration efficiency on solid particle number(SPN) was close to100%. The post-CDPF particles were mainly in accumulation mode. The downstream SPN was sensitively influenced by the variation of the soot loading. This phenomenon provides a method for determining the balance point temperature by measuring the trend of SPN concentration. 相似文献
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Siqin Zhuoya Niu Dongxiao Li Mingyu Zhen Hao Yang Xiaolong 《Environmental science and pollution research international》2022,29(23):34528-34545
Environmental Science and Pollution Research - This paper aims to examine the nexus among carbon dioxide (CO2) emissions, urbanization level and industrial structure in North China over the period... 相似文献
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采用机械淋滤/厌氧生物组合工艺,充分发挥机械淋滤反应器的水解酸化功能和厌氧生物反应器的产甲烷功能,对有机生活垃圾进行了中试规模处理。厌氧生物反应器经过接种,15 d驯化完成。厌氧反应器出水回流淋洗水量对机械淋滤反应器运行特征有较大影响,当回流淋洗水量为3.0 m3/d时,淋滤液COD、VFA第8天时浓度分别为41 000 kg/L和2 000 kg/L。对机械淋滤反应器/厌氧反应器组合工艺进行了多批次实验,每吨有机生活垃圾平均产生沼气87.2 m3,甲烷含量稳定在75%,平均产沼系数为0.46 m3/kg COD,厌氧生物反应器出水COD平均值为560 mg/L,在对有机生活垃圾处理的同时实现有机生活垃圾资源化利用。 相似文献
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湘江长沙段沉积物重金属污染特征及其评价 总被引:4,自引:0,他引:4
本研究用沉积柱钻探取样法获得湘江长沙段沉积物样品,利用等离子质谱仪(ICP-MS)分析沉积物中9种重金属含量,并利用X射线衍射仪(XRD)分析沉积物的矿物组成.在此基础上,利用地累积指数和潜在生态风险指数等方法,评价沉积物重金属污染程度.结果表明,湘江长沙段沉积物中重金属含量变化较大(CV﹥0.20),分布不均一.其中Mn、Zn、Pb、Cu、Cr、Co、Ni达中等-显著富集程度,而V、Th无明显富集.地累积指数和潜在生态风险评价结果显示,长沙段沉积物中Pb、Zn、Mn、Cu达偏中度至偏重度污染,Cr、Co、Ni、Th为轻污染.重金属存在轻至中等程度的潜在生态风险,其风险程度大小排序为:PbCuNiCoZnMnCrV.沉积物中Mn、Cu、Zn、Pb、Co、Ni、Cr、V可能与流域中上游矿石冶炼等人为活动带入有关,而Th可能来自流域岩石风化等自然过程.流域重金属污染防治中,应密切关注Mn、Cu、Zn、Pb等重金属引起的污染. 相似文献
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中国环境空气苯系物类挥发性有机物监测能力现状分析 总被引:2,自引:1,他引:1
为了解和评价中国环境空气挥发性有机物(VOCs)的监测能力和技术水平,以量化的手段评估环境空气VOCs监测数据质量,促进实验室质量管理水平提升,笔者以环境空气VOCs中的苯系物为代表,组织31个省、自治区、直辖市216家各级各类生态环境检验检测机构开展了实验室比对,利用稳健统计技术分析评价实验结果。结果表明:环境空气苯系物类VOCs比对结果的整体合格率为68.5%,省级站、地市级以上站、社会化检测机构合格率分别为86.7%、75.4%和46.9%。可见现阶段中国环境空气苯系物类VOCs整体检测能力仍有提升的空间,社会化机构的检测技术水平尚待提升。建议地方部门加强对环境空气VOCs监测的技术培训,尽快提高VOCs监测技术水平,保障VOCs监测数据质量,同时强化对社会化检测机构的监督管理,督促其提升服务水平。 相似文献
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Hongrui M Linke Ge Shengkai Cao Crispin Halsall Junfeng Niu Dongxiao Bai Guangkai He Peng Zhang 《环境科学学报(英文版)》2023,35(2):139-145
The photochemical behavior of organic pollutants in ice is poorly studied in comparison to aqueous photochemistry.Here we report a detailed comparison of ice and aqueous photodegradation of two representative OH-PAHs,2-hydroxyfluorene (2-OHFL) and 9-hydroxyfluorene (9-OHFL),which are newly recognized contaminants in the wider environment including colder regions.Interestingly,their photodegradation kinetics were clearly influenced by whether they reside in ice or water.Under the same simulated s... 相似文献
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