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排序方式: 共有104条查询结果,搜索用时 15 毫秒
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Bang Ho Quoc Nguyen Hiep Duc Vu Khue Hien To Thi 《Environmental Modeling and Assessment》2019,24(3):295-310
Environmental Modeling & Assessment - This paper describes the application of the air pollution model (TAPM-CTM) for photochemical airshed modelling in the Ho Chi Minh region. The model was... 相似文献
3.
吉林生态省建设规划背景评价的生态足迹分析 总被引:3,自引:0,他引:3
生态足迹理论在应用于区域层次时,因为区域进出口数据的不健全,在计算净消费量的过程中往往误差较大,因此,很难真实反映区域环境的压力负荷.所以,本文以区域生产量取代消费量,并用生产性生态足迹作为区域可持续发展的评价指标,对吉林省2002年的生产性生态足迹进行了计算分析.结果表明,吉林省2002年的生物生产发展模式处于一种不可持续的状态,并简要分析了存在生产性生态赤字的原因和消除生态赤字的途径和方法,将为更好的实施生态省建设规划提供一定的科学指导性意见. 相似文献
4.
Nguyen Kim Nga Huynh Dang Chinh Phi Thi Thuy Hong Tran Quang Huy 《Journal of Polymers and the Environment》2017,25(2):146-155
This study aimed at finding effective strategies for high-performance removal of reactive blue 19 (RB19) dye from aqueous solution. Chitosan (CS) films had been prepared by using solvent casting with mild drying for this purpose. The CS films were characterized by X-ray diffraction, field-emission scanning electron microscopy, and Fourier transform infrared (FTIR) spectroscopy. The performance of RB19 removal using CS were evaluated by varying contact time, solution pH, initial dye concentration, and adsorbent dosage. Adsorption isotherms, kinetics, and desorption were investigated by batch experiments. Results showed that CS films exhibited the optimal adsorption performance for RB19 removal and high maximum adsorption capacities of RB19, which were 799 and 822.4 mg g?1 at 20 and 40 °C, respectively. Adsorption kinetic data were well described by the pseudo-second-order kinetic model. FTIR analyses further indicated that interactions between RB19 and the CS film occurred during adsorption. The CS films also exhibited satisfactory desorption of RB19 at about 80 % after 30 min of desorption at pH 11. Our study demonstrated that the CS films can be easily prepared and applied for effective removal of RB19 in treatment of wastewater. 相似文献
5.
Tran Quang Tuyen 《Environment, Development and Sustainability》2016,18(4):1239-1254
This study analyzes the sources of income inequality among ethnic minorities in the Northwest region—the poorest and highest inequality region of Vietnam. Using an analysis of Gini decomposition by income source, the results show that while agricultural income, notably crop income, considerably decreases income inequality, off-farm income sources (wage and non-farm self-employment incomes) are found to increase inequality. This can be explained that in comparison with other income sources, agricultural income is more equally distributed and the main income source for most poor households. However, off-farm income sources are more unequally distributed and flow disproportionately toward the better-off. The findings support the hypothesis that income diversification in non-farm activities results in either greater inequality if opportunities for these activities are skewed toward to the better-off or less inequality if such opportunities are accessible to the poorer part of the population. 相似文献
6.
Weiteng Hung Wen-Yen Huang Chitsan Lin Chi Thanh Vu Siwalee Yotapukdee Acharee Kaewlaoyoong Jenq-Renn Chen Yun-Hwei Shen 《Environmental science and pollution research international》2017,24(23):18936-18945
The remediation of dioxin-contaminated soil of a specific coastal area previously employed for the manufacture of pentachlorophenol (PCP) in southern Taiwan’s Tainan City has attracted much attention of researchers there. This work addresses the possibility of providing an effective and environmentally friendly option for removing PCDD/Fs from soil in that field. Soil screening/sieving was first conducted to assess particle distribution. Fine sand was observed to be the major component of the soil, accounting for more than 60% of the total mass. A combination of ultrasonification and mechanical double-blade agitation was used to facilitate the washing of the soil using the biosurfactant anaerobic compost tea. More than 85 and 95% of total removal efficiencies were achieved for moderately and highly contaminated soils after 6 and 10 washing cycles, respectively, under ambient temperature, a soil/liquid ratio 1:2.5, 700 rpm, and over a relatively short duration. These results were achieved through the collision and penetration effects of this combined treatment as well as PCDD/F partitioning between the particles and anaerobic compost tea. This study represents the first to report the use of anaerobic compost tea solvent to wash soil highly contaminated by dioxin. It was concluded that anaerobic compost tea, rich in non-toxic bio-surfactants (e.g., alcohols, humic acids), can be used to improve bioavailability and bioactivity of the soil making bio-attenuation and full remediation more efficient. 相似文献
7.
Hoang Anh Tuan Nguyen Xuan Phuong Duong Xuan Quang Huynh Thanh Tung 《Environmental science and pollution research international》2021,28(23):28876-28910
Environmental Science and Pollution Research - Always, oil spills do cause serious and dire consequences for the environment, nature, and society that it consumes much time and socio-economic... 相似文献
8.
Nguyen Xuan Cuong Nguyen Thi Thanh Huyen Bui Xuan-Thanh Tran Xuan Vu Tran Thi Cuc Phuong Hoang Nhung Thi Tuyet La Duc Duong Chang Soon Woong Ngo Huu Hao Nguyen Dinh Duc 《Environmental science and pollution research international》2021,28(45):63589-63598
Environmental Science and Pollution Research - The failure of the centralized water supply system forced XY community to become more dependent on uncertain and unstable water sources. The results... 相似文献
9.
研究采用铁为阳极电化学法处理直接黄11染料模拟废水脱色性能的影响进行研究。影响因素包括:电流密度、pH值、染料浓度和电解质浓度。研究结果表明,电流密度大有利于染料废水脱色,但能耗消耗大;初始溶液在中性条件下不仅取得很好的处理效果,而且脱色能耗较低;随着染料初始浓度增加脱色率和脱色能耗降低的趋势;随着电解质浓度升高染料脱色率下降的趋势,脱色能耗先减少,然后缓慢增大。在染料初始浓度50 mg/L、pH值为7.11、电流密度2.083 mA/cm2、电解质Na2SO4浓度0.01 mol/L、温度20℃、搅拌速度600 r/min、电解时间60min条件下,脱色率达到92.2%,脱色能耗1.709 kW.h/kg染料。 相似文献
10.
Martha W. Gilliland Lee Becker Ralph Cady Joe Gabig James Gilley Richard A. Kern Arley Larson Quang M. Nguyen William Powers Raymond Supalla 《Journal of the American Water Resources Association》1985,21(2):281-290
Substantial conflict exists over water management and allocation in the Platte River Basin of Nebraska. An interdisciplinary computer simulation model, representing the water quantity, water quality, environmental, and economic dimensions of the conflict, was developed in order to analyze the tradeoffs among allocation scenarios. Most importantly, decisionmakers and interest groups were involved in model development. Simulation results for a base case and two scenarios are presented. One scenario favors protection of instream flow for wildlife; the other favors water diversions for agriculture. Impacts of the instream flow scenario, as measured by the amount of land irrigated, groundwater levels, the amount of wildlife habitat for cranes and catfish, and net agricultural benefits did not differ greatly from those of the base case. However, impacts of the diversion scenario were substantial. On the negative side, instream flows and wildlife habitat declined an average of 39 percent; while, on the positive side, groundwater levels and net agricultural benefits each increased 6 percent. The modeling process was successful insofar as it promoted an understanding among the highly diverse interest groups of the systems nature of the Basin. One agreement on a water diversion schedule among three of the parties has been reached, partly as a result of this process. More comprehensive compromises have not yet been forged. Our experience, however, indicates that modeling success at the policymaking level depends more on the extent to which the policymakers understand the model than it does on model sophistication. 相似文献