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21.
Thomas JE Ou LT Allen LH McCormack LA Vu JC Dickson DW 《Journal of environmental science and health. Part. B》2004,39(4):505-516
With the phase-out of methyl bromide scheduled for 2005, alternative fumigants are being sought. This study of Telone C35, a mixture of (Z)- and (E)-1,3-dichloropropene (1,3-D) with chloropicirin (CP), focuses on its emissions, distribution, and persistence in Florida sandy soil in microplots with different soil-water and organic matter carbon (C) content with and without two different plastic film mulches. The addition of CP did not affect the physical behavior of the isomers of 1,3-D. Slower subsurface dispersion and longer residence time of the mixed fumigant occurred at higher water content. An increase in the percent organic carbon in the soil led to a more rapid decrease for chloropicirin than for 1,3-dichloropene isomers. The use of a virtually impermeable film (VIF) for soil cover provided a more even distribution and longer persistence under all the conditions studied in comparison to polyethylene (PE) film cover or no cover. The conditions of near field capacity water content, low organic matter, and a virtually impermeable film cover yielded optimum conditions for the distribution, emission control, and persistence of Telone C35 in a Florida sandy soil. 相似文献
22.
建筑小区雨水径流的土壤渗透净化 总被引:3,自引:0,他引:3
讨论了建筑小区雨水径流的污染性、土壤渗透对小区径流的净化作用及土壤的渗透能力,提出了建筑小区雨水径流土壤渗透的工程实施方案。 相似文献
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Zhifang Wang Qiuxin Huang Yiyi Yu Chunwei Wang Weihui Ou Xianzhi Peng 《Environmental geochemistry and health》2013,35(5):683-691
Stereoisomeric compositions can provide insights into sources, fate, and ecological risks of contaminants in the environment. In this study, stereoisomeric profiles of ibuprofen and iopromide were investigated in wastewater and receiving surface water of the Pearl River Delta, south China. The enantiomeric fraction (EF) of ibuprofen was 0.108–0.188 and 0.480, whereas the isomer ratio (IR) of iopromide was 1.426–1.673 and 1.737–1.898 in the influent and final effluent, respectively, suggesting stereoselective degradation occurred for both pharmaceuticals during wastewater treatment. Ibuprofen showed enantioselective degradation in the anaerobic, anoxic, and aerobic conditions, whereas iopromide displayed isomer-selective degradation only under the aerobic condition. In the river waters, the EF of ibuprofen was 0.130–0.327 and the IR of iopromide was 1.500–2.531. The results suggested that pharmaceuticals in the mainstream Pearl River were mainly from discharge of treated wastewater, whereas in the tributary rivers and urban canals, direct discharge of untreated wastewater represented a significant contribution. The IR of iopromide can be an applicable and efficient tracer for wastewater discharge in the environment. 相似文献
27.
微细粉尘在静电除尘器中的运动状态分析 总被引:1,自引:0,他引:1
为了分析线板静电除尘器中的电流体动力学过程,利用FEMLAB软件对电势泊松方程和电流连续性方程进行联立耦合求解,得到线板放电过程中电场强度分布,估算电晕外区不同粒径粉尘所受到的电场力;利用Fluent软件采用动力风模拟离子风的方法计算放电通道的流场分布,得到空间速度分布图,并分析了气流扰动对颗粒物的运动状态的影响。结果表明:利用动力风模拟离子风流场的分布符合放电环境下离子风的形成过程,该方法可以简化复杂的电流体问题。不同粒径粉尘在电场空间中的运动受到的电场力、离子风力随粒径大小不同而变化很大。研究结果对静电除尘器的改造和设计有很重要的指导意义。 相似文献
28.
Fengjie ZHANG Xiaoxia OU Shuo CHEN Chunqiu RAN Xie QUAN 《Frontiers of Environmental Science & Engineering》2012,6(4):484-492
The competitive adsorption and desorption of Pb(II) and Cu(II) ions in the soil of three sites in North China were investigated using single and binary metal solutions with 0.01 mol·L-1 CaCl2 as background electrolyte. The desorption isotherms of Pb(II) and Cu(II) were similar to the adsorption isotherms, which can be fitted well by Freundlich equation (R 2>0.96). The soil in the three sites had greater sorption capacities for Pb(II) than Cu(II), which was affected strongly by the soil characteristics. In the binary metal solution containing 1∶1 molar ratio of Pb(II) and Cu(II), the total amount of Pb(II) and Cu(II) adsorption was affected by the simultaneous presence of the two metal ions, indicating the existence of adsorption competition between the two metal ions. Fourier transform infrared (FT-IR) spectroscopy was used to investigate the interaction between soil and metal ions, and the results revealed that the carboxyl and hydroxyl groups in the soil were the main binding sites of metal ions. 相似文献
29.
提出一种固体废物六价铬分析样品快速前处理方法,其消解条件、样品分析与现行国家标准方法相同,不同的是,样品消解后,用离心方法替代过滤方法,能实现样品的快速、准确分析。 相似文献
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项目教学法是教师为主导,学生为主体,项目为载体,任务为驱动,以职业能力培养为目标,以社会需求为背景的系统的教学方法。以中国环境管理干部学院为例,通过讲述项目教学法的特点及在实践教学中的应用原则,提出了项目教学法在学院商务英语谈判课堂上进行的步骤、遇到的困难,并提出了相应的改进措施。 相似文献