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61.
Hsin Chu Guang Huei Hao Ting Ke Tseng 《Journal of the Air & Waste Management Association (1995)》2013,63(4):574-581
ABSTRACT The catalytic incineration of dimethyl sulfide and dimethyl disulfide [(CH3)2S and (CH3)2S2] over an MnO/Fe2O3 catalyst was carried out in a bench-scale catalytic incinerator. Three kinetic models (i.e., the power-rate law, the Mars and Van Krevelen model, and the Langmuir-Hinshelwood model) were used to analyze the results. A differential reactor design was used for best fit of kinetic models in this study. The results show that the Langmuir-Hinshelwood model may be feasible to describe the catalytic incineration of (CH3)2S and (CH3)2S2. This suggests that the chemical adsorption of O2 molecules is important in this incineration. 相似文献
62.
Identification of sources of elevated concentrations of polycyclic aromatic hydrocarbons in an industrial area in Tianjin, China 总被引:2,自引:0,他引:2
Wentao Jiao Yonglong Lu Jing Li Jingyi Han Tieyu Wang Wei Luo Yajuan Shi Guang Wang 《Environmental monitoring and assessment》2009,158(1-4):581-592
The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) were determined by gas chromatography equipped with a mass spectrometry detector in 105 topsoil samples from an industrial area around Bohai Bay, Tianjin in the North of China. Results demonstrated that concentrations of PAHs in 104 soil samples from this area ranged from 68.7 to 5,590 ng g???1 dry weight with a mean of ∑16PAHs 814 ± 813 ng g???1, which suggests that there exists mid to high levels of PAH contamination. The concentration of ∑16PAHs in one soil sample from Tianjin Port was exceptionally high (48,700 ng g???1). Ninety-three of the 105 soil samples were considered to be contaminated with PAHs (>200 ng g???1), and 25 were heavily polluted (>1,000 ng g???1). The sites with high PAHs concentration are mainly distributed around chemical industry parks and near highways. Two low molecular weight PAHs, naphthalene and phenanthrene, were the dominant components in the soil samples, which accounted for 22.1% and 10.7% of the ∑16PAHs concentration, respectively. According to the observed molecular indices, house heating in winter, straw stalk combustion in open areas after harvest, and petroleum input were common sources of PAHs in this area, while factory discharge and vehicle exhaust were the major sources around chemical industrial parks and near highways. Biological processes were probably another main source of low molecular weight PAHs. 相似文献
63.
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (DL-PCBs) were measured in ambient air samples collected from different parts of South Korea in 2008, and the measured levels were used for assessing the spatial and temporal distribution of atmospheric PCDDFs and DL-PCBs in South Korea. The average concentrations of atmospheric PCDD/Fs and DL-PCBs among the 37 sites were 28 fg I-TEQ m−3 (ND ∼ 617) and 1 fg WHO-TEQ m−3 (ND ∼ 0.016). Elevated atmospheric levels of PCDD/Fs and DL-PCBs observed at residential/industrial sites and in the north-west of Korea, indicated a potential contribution and impacts of anthropogenic sources of PCDD/Fs and DL-PCBs. These levels were similar or lower than those previously reported in other ambient air surveys. Average concentrations of PCDD/Fs showed small seasonal variations (ANOVA analysis, p = 0.144). The highest concentrations of PCDD/Fs were observed during winter, followed by spring, autumn and summer. Atmospheric PCDD/Fs and DL-PCBs in South Korea rapidly decreased during the last 10 years (1998-2008), demonstrating the efficiency of stricter regulations and the application of best available technologies/best environmental practices at emission sources. Comparison of the congener profiles and principal component analysis showed that current atmospheric PCDD/Fs are mostly influenced by industrial sources and PCBs from old commercial PCB uses. Nationwide POPs monitoring will continue and allows an effective evaluation of the implementation of the Stockholm Convention on POPs. 相似文献
64.
城市垃圾处理与管理对策研究 总被引:55,自引:1,他引:54
对北京、天津、上海、重庆、广州等17个城市垃圾的调查,结果表明,近10年,上述城市垃圾总量的增长城市化关系密切,城市垃圾的组分受经济发展,生活水平、消费行为方式的影响,地域差异显著;城市垃圾处理技术欠完善,管理体制不合理,急需通过市场化动作国吧改善。 相似文献
65.
利用VB语言作为编程工具,探讨了开发线切割3B格式自动编程软件的过程.通过该软件,可以直观显示线切割加工的轨迹图及其3B程序. 相似文献
66.
67.
夏光 《中国人口.资源与环境》1996,6(2):16-19
本文针对国内外宏观环境决策中存在的问题,阐述了以科学研究为基础的宏观环境决策支持系统的作用,分析了决策观点和思维的多样性对宏观环境决策的意义,探讨了宏观环境决策与环境基础学科建设的关系。 相似文献
68.
本文简述了清洁生产的概念与国外清洁生产的概况,评述了国内工业生产的现状及推行清洁生产的潜力和前景,并提出了一些有益建议。 相似文献
69.
本文研究了芥子气气体发生的一种方法——渗透管法。在自制芥子气渗透管的基础上,研究了渗透管法发生的可行性、稳定性以及温度对膜渗透速率的影响。 相似文献
70.
扬州市生态旅游发展战略的研究 总被引:4,自引:0,他引:4
分析扬州市旅游业发展的优势和劣势,论述并评价扬州市主要的生态旅游资源,进行扬州市生态旅游发展的功能分区与项目策划,提出实施扬州市生态旅游发展战略的对策及措施。 相似文献