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411.
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Jiang Jianguo Yang Yong Yang Shihui Ye Bin Zhang Chang 《Waste management (New York, N.Y.)》2010,30(5):848-855
Leachate levels are important to landfill stability and safety. High leachate or water levels often lead to landfill instability, which can cause accidents. Here a case study of a landfill located in a humid region of southern China is presented. Leachate distribution and quality were systematically analyzed, and the effect of leachate level on waste-mass stability was assessed. Boreholes were drilled in the field, samples were analyzed in the laboratory, and a simulation was performed. In addition, the safety and stability of the landfill was evaluated. The leachate level in the landfill was 9–19 m, which was higher than the top of the dam crest (8–20 m). Leachate accounted for more than 1/4 of the total landfill storage capacity. The contaminant concentration of the leachate samples collected directly from the waste body was very high, with large variation among the samples. The mean concentrations of NH3–N, BOD, and COD from the waste body were 5404, 14,136, and 22,691 mg/L, nearly 2.7, 2.4, and 1.8 times the mean concentrations in the leachate pond, respectively. Three series of shear strength parameters were used in a slope stability analysis, and a limit equilibrium method was used to calculate the factor of safety (Fs). The analysis showed that Fs could be affected by potential anisotropy in the shear strength of the waste. The minimum values of Fs corresponding to series I were 1.84 and 1.17 for units ? and II, respectively. The Fs value of unit II was significantly lower than the safe design value (1.25). In addition, Fs decreased with increase in the normalized height of the leachate level, h/H, where h is the height of the leachate mound and H is the maximum thickness of the landfill. If the h/H values of units I and II are kept below 50% and 40%, respectively, a safe design value of 1.25 for Fs can be guaranteed. Therefore, some measures to prevent risk should be considered. 相似文献
413.
在钢铁企业有效应用安全评价,不但能够有效识别现场的危险因素,确定危险源,及时妥善地采取安全对策措施,还能够促进安全管理重心下移,实现逐级管理,更有利于消除现场人的不安全行为和物的不安全状态. 相似文献
414.
This paper is to investigate the behavior of residents towards electrical and electronic waste (e-waste) recycling in Beijing. For this purpose a large sample questionnaire survey was performed to explore the residents’ characteristics of recycling behavior and preference of e-waste recycling pattern. Besides, the willingness of residents to participate in e-waste recycling was also assessed in our study. For this a logistic regression model was developed to estimate and explain residents’ willingness in e-waste recycling. The model showed that Convenience of recycling facilities and service, Residential conditions, Recycling habit and Economic benefits are four determinants of Beijing residents’ willingness and behavior in e-waste recycling. And centralized recycling pattern by professional recovery spots would have a broad prospect if various kinds of channels can be provided to make the residents feel more convenient in e-waste recycling. 相似文献
415.
随着计算机的普及 ,局域网络越来越广为利用 ,但也出现了相应的失密问题。本文从信息及实体两个方面 ,论述了局域网络的保密措施。 相似文献
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广东省台风灾害特点及减灾对策 总被引:17,自引:5,他引:12
根据《台风年鉴》等台风资料,分析了广东省台风灾害的特点,讨论了台风灾害对广东省经济,社会及生态环境的影响,并针对广东省台风灾害的特点提出了减轻台风灾害的对策。 相似文献
419.
通过分析广州市某金属制品有限公司的废水处理工程,证实了采用分流、化学反应(氧化、还原、中和)-沉淀过滤法处理电镀废水,配合pH、ORP在线自动加药控制系统,可使出水达到《污水综合排放标准》(GB8978-1996)中的一级排放标准。 相似文献
420.
AFS-830型双道原子荧光光度计同时测定饮用水中砷、汞 总被引:1,自引:0,他引:1
主要探讨应用AFS-830型双道原子荧光光度计,在饮用水监测中同时测定水中砷、汞的方法和技术。此法是在硝酸介质,以硼氢化钠作还原剂,进行原子化,被测元素原子激发出荧光强度值在一定范围内与被测元素的浓度成正比。砷与汞的检出限分别为0.0618和0.0158ug/L。 相似文献