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441.
442.
443.
Xu Bin Gao Naiyun Rui Min Wang Hong Wu Haihui 《Frontiers of Environmental Science & Engineering in China》2007,1(3):350-356
The ozone oxidation of endocrine disruptor bisphenol A in drinking water was investigated. A stainless completely mixed reactor
was employed to carry out the degradation experiments by means of a batch model. With an initial concentration of 11.0 mg/L,
the removal efficiencies of BPA (bisphenol A) could be measured up to 70%, 82%, and 90% when the dosages of ozone were 1,
1.5, and 2 mg/L, respectively. The impacts on BPA degradation under the conditions of different ozone dosages, water background
values, BPA initial concentrations, and ozone adding time were analyzed. The results showed that ozone dosage plays a dominant
role during the process of BPA degradation, while the impact of the contact time could be ignored. UV wavelength scanning
was used to confirm that the by-products were produced, which could be absorbed at UV254. The value of UV254 was observed
to have changed during the ozonation process. Based on the change of UV254, it could be concluded that BPA is not completely
degraded at low ozone dosage, while shorter adding time of total ozone dosage, high ozone dosage, and improvement of dissolved
ozone concentration greatly contribute to the extent of BPA degradation. The effects of applied H2O2 dose in ozone oxidation of BPA were also examined in this study. The O3-H2O2 processes proved to have similar effects on the degradation of BPA by ozone oxidation.
Translated from Environmental Science, 2006, 27(2): 294–299 [译自: 环境科学] 相似文献
444.
啤酒废水的水解——好氧处理技术(H/O工艺) 总被引:3,自引:0,他引:3
比较了啤酒废水的几种处理工艺,介绍了水解——好氧(H/O)工艺的特性及其主要设计参数。 相似文献
445.
随着多环境介质问题研究的深入,重金属在跨介质迁移时产生的界面效应问题倍受人们关注。土-岩界面因其特有的微环境结构和特性,使重金属在该界面的行为过程既部分地表现出与在两侧的环境介质运移过程的动力学特征及机制,又有其独特的特性。有关研究表明自然因素及人为活动等引起的环境参数的变化对土-岩界面的重金属行为有显著影响。今后土-岩界面的重金属行为研究应在目前研究状况的基础上立足于为土壤污染的修复提供技术支撑。 相似文献
446.
A broad and objective perspective of ecological and socioenomic knowledge is required to underlie a scientific approach to
the problems of terrestrial restoration ecology. Uncertainty associated with limited scientific knowledge highlights the crucial
importance of the interaction between science and policy in weighing ecological restoration alternatives in relation to other
management options. In this paper, we provide a pragmatic definition for restoration ecology that is suitable for extensive
terrestrial applications and present a decision framework to help organize and clarify different phases of the decision process
as it is related to ecological restoration. We argue that restoration planning should include a wider spectrum of participants
and decisions than have traditionally been employed. 相似文献
447.
Nassir El-Jabi Jean Rousselle 《Journal of the American Water Resources Association》1987,23(2):179-187
ABSTRACT: Hydrologic and economic information must be integrated in flood plain management. This study describes an integrated approach which includes consideration of the hydrologic, hydrodynamic, physical, and economic components of the total system. On the basis of these components, a theoretical model is proposed which provides a rational procedure for estimating flood damages from projections of economic development within an area. The utility of the model is demonstrated by applying it to a flood-prone region in Southern Quebec, Canada. 相似文献
448.
Leonard F. DeBano Burchard H. Heede 《Journal of the American Water Resources Association》1987,23(3):463-470
ABSTRACT: Naturally occurring and man-made structures can be used for enhancing the development of riparian zones. Naturally occurring structures are cienagas, beaver dams, and log steps. Man-made structures include large and small channel structures and bank protection devices. All these structures affect streamflow hydraulics and sedimentation and can create a more favorable environment for riparian zone establishment. However, when they are used improperly, they can be destructive to existing riparian zones. Since stream processes are generally slow, long-time spans may pass before the effects of management action, good or bad, become visible. Also, the effects of large dam installations may appear a long distance downstream from the dam. Therefore, investigations must be of a wide scope. Interactions between riparian site, channel, and streamflow may be so complex that an interdisciplinary approach is required. 相似文献
449.
Ian G. Wallis 《Journal of the American Water Resources Association》1978,14(3):576-586
ABSTRACT: An experimental investigation of the random component in stream meandering is described. The results of sixty replicate experiments of meander initiation and development made using the same discharge, bed material and bed slope are described and analyzed. It is demonstrated that the commencement of meandering is a random process. The random component in meander behavior is indicated by the size of the coefficients of variation of meander amplitude and wavelength of 0.45 and 0.22, respectively. A simple model is put forward to explain the observed deterministic and random components of meander behavior. 相似文献
450.
Cristina L. Popa Simona I. Dontu Erika A. Levei Cristian I. Ioja Ana-Maria Popa Mirela Miclean 《Journal of environmental science and health. Part. B》2020,55(4):329-341
AbstractClosed lakes located in urban parks act as sinks of organochlorine pesticides (OCPs), which have been used, for decades, as insecticides, herbicides and fungicides. The closed lakes from Bucharest, Romania, are periodically managed to prevent eutrophication and accumulation of pollutants. However, it is not known if these practices reduce or enhance the legacy pollution with OCPs. The aim of this study was to explore the spatial variation of OCPs in closed lakes. The total concentration of OCPs in water and sediments ranged between 0.0176 and 37.1?µg/L, and between 122 to 1,890?ng/g, respectively. The concentrations of OCPs were compared with the consensus-based sediment quality guidelines (SQGs) in order to evaluate the ecological risks of sediments. The highest potential adverse effects were associated with γ-HCH exposure. Periodical draining and dredging of lakes lead to the resuspension of contaminants, increasing pesticide bioavailability and accumulation in sediments. In addition, we observed that fluorescent dissolved organic matter (DOM) might influence the OCPs cycle. The quantity and character of fluorescent DOM can provide further insight into OCPs degradation. Also, this study may help urban planners to determine the state of urban waters and to find the best solution for water management. 相似文献