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101.
采用悬浮填料 SBR工艺处理青霉素制药废水 ,结果表明 :青霉素废水中含有的抗生素对微生物有抑制作用 ,宜采用非限制曝气的进水方式 ;最佳运行工艺为一周期 8h ,非限制曝气进水 1h ,反应 5h ,沉淀、排水和闲置 2h ;该工艺与单一SBR工艺相比 ,可提高CODCr去除率 2 0 %以上 ,缩短反应时间 2h ;且具有良好的稳定性 ,当进水CODCr浓度变化较大( 80 0— 2 5 0 0mg L)时 ,CODCr去除率一直稳定于 83 %— 85 %之间 ,出水CODCr在 136— 35 0mg L之间 ,达到国家二级排放标准。 相似文献
102.
Source apportionment studies of TSP(atmospheric particulate matter with aerodynamic diameters≤100μm)and PM10(atmospheric particulate matter with aerodynamic diameters≤10μm)have revealed that soil dust is all important source of these particulates in China In this study, the contamination of soil dust was assessed through the use of a geoaccumulation index(Igeo). The mass concentration profiles ofl7 elements(Na, Mg, AI, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Br, Ba, andPb)were establishedforurban soil dusts. Geochemical cOmpositions of soils from 15 cities were used to represent background urban soil compositions. The results of this Studv indicated that a number of cities are severely polluted by particulates containing Ca, Cr, Ni, and Cu in both size fractions(TSP and PM10). Contamination with Zn, Pb, Co, and Br was moderate to severe(Igeo>2). The AI and Fe concentrations were not high enough for them to be considered contaminants. 相似文献
103.
针对传统复杂人机系统人误分析中,只注重影响因素与人误的直接关系,而忽视影响因素内部关联的问题,将CREAM中9个共同绩效条件因子(CPC)视为初始人误影响因素,通过研究其内部关联性,提出了一种因子修正规则。首先基于灰色关联分析法和过往人误案例分析,对CPC因子进行分类,并得出同类因子间具有非负相关性;然后分析CPC因子调整方案中存在的主要问题,通过引入新的CPC因子,建立了CPC关联模型;最后利用逻辑推理方法,证明CPC因子中的被影响因子在任何初始判断结果下均可能由于其他因子的影响性质发生改变,进而得出因子修正规则,该规则简单且易于理解,具有一定的实践意义。 相似文献
104.
Kosuke Kawai Luong Thi Mai Huong Masato Yamada Masahiro Osako 《Journal of Material Cycles and Waste Management》2016,18(3):517-526
The organic fraction of municipal solid wastes in Southeast Asia, which has a high moisture content, accounts for a large proportion of total waste. Local governments need to pay adequate attention to the composition of wastes to determine alternative waste management technologies. This study proposed the use of a triangle diagram to describe changes in proximate composition and rates of successful source separation of municipal solid waste and to identify technical challenges about alternative waste management technologies such as incineration, composting, and refuse-derived fuel production based on physical and proximate composition analysis of household waste sampled in Hanoi, Vietnam, as a case study. The analysis indicated the effectiveness of different types of source separation as well as different levels of successful achievement of source separation as an adjustment mechanism for the proximate composition of waste. Proper categorization of wastes for source separation is necessary for the appropriate use of alternative waste management technologies. The results showed that, at a source separation rate of just greater than 0.52 in a three-way separation scheme, the waste separated as combustible waste would be suitable for incineration with energy recovery. Based on well-designed schemes of source separation, alternative waste management technologies can be applied. 相似文献
105.
Drivers of Forest Cover Dynamics in Smallholder Farming Systems: The Case of Northwestern Vietnam 总被引:1,自引:0,他引:1
The national-scale forest recovery of Vietnam started in the early 1990s and is associated with a shift from net deforestation to net reforestation. Large disparities in forest cover dynamics are, however, observed at the local scale. This study aims to unravel the mechanisms driving forest cover change for a mountainous region located in northwest Vietnam. Statistical analyses were used to explore the association between forest cover change and household characteristics. In Sa Pa district, deforestation rates are decreasing, but forest degradation continues at similar rates. Deforestation is not necessarily associated with impoverished ethnic communities or high levels of subsistence farming, and the largest forest cover dynamics are found in villages with the best socio-economic conditions. Our empirical study does not provide strong evidence of a dominant role of agriculture in forest cover dynamics. It shows that empirical studies on local-scale forest dynamics remain important to unravel the complexity of human–environment interactions. 相似文献
106.
107.
Nguyen Lan Huong Nguyen Tien Dung Tran Thi Viet Nga Nguyen Duc Luong Tran Hoai Son Nguyen Thuy Lien Nguyen Thi Huong Nguyen Hoang Giang Nguyen Tan Phong Nguyen Ngoc Tuan Isawa Tomoo Ta Yasutaka Sato Ryoichi 《Environmental science and pollution research international》2022,29(28):41983-41991
Environmental Science and Pollution Research - Steel slag is an industrial by product of steel manufacturing processes and has been widely utilized within civil and construction materials for road... 相似文献
108.
109.
在黄海、渤海湾和莱州湾采集64个表层沉积物样品,分析正构烷烃(C15~C33)和甾醇(菜子甾醇、菜油甾醇、谷甾醇和豆甾醇)的质量分数和分子组合特征,探讨其来源,比较物质来源的空间差异。结果表明:(1)黄海表层沉积物中类脂生物标志物主要呈现陆源和海源共同影响的特征,其中北黄海以陆源输入为主,高碳数正构烷烃(>C24)具有明显的奇碳优势,陆源高等植物的贡献较大;南黄海陆源输入与海洋自身贡献相当;渤海湾与莱州湾接受来自河流的大量陆源物质;(2)来源于陆源高等植物的甾醇(包括菜油甾醇、谷甾醇和豆甾醇)在黄海表层沉积物中的质量分数远小于渤海湾和莱州湾,但指示硅藻来源的菜子甾醇在整个研究区域均具有较高的质量分数。 相似文献
110.
Bo Han Xiaohui Bi Yonghua Xue Jianhui Wu Tan Zhu Baogui Zhang Jianqing Ding Yuanxin Du 《Frontiers of Environmental Science & Engineering》2011,5(4):552-563
A total of 168 PM10 samples were collected during the year of 2005 at eight sites in the city of Wuxi in China. Fifteen chemical elements, three water-soluble ions, total carbon and organic carbon were analyzed. Six source categories were identified and their contributions to ambient PM10 in Wuxi were estimated using a nested chemical mass balance method that reduces the effects of colinearity on the chemical mass balance model. In addition, the concentrations of secondary aerosols, such as secondary organic carbon, sulfate and nitrate, were quantified. The spatially averaged PM10 was high in the spring and winter (123 ??g·m?3 and low in the summer-fall (90 ??g·m?3). According to the result of source apportionment, resuspended dust was the largest contributor to ambient PM10, accounting for more than 50% of the PM10 mass. Coal combustion (14.6%) and vehicle exhaust (9.4%) were also significant source categories of ambient PM10. Construction and cement dust, sulfates, secondary organic carbon, and nitrates made contributions ranging between 4.1% and 4.9%. Other source categories such as steel manufacturing dust and soil dust made low contributions to ambient PM10. 相似文献