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排序方式: 共有295条查询结果,搜索用时 31 毫秒
1.
Pradhan Umesh Kumar Ram Anirudh Sahu Balaram P. B. Udayakrishnan Lonkar Saurabh Kumbhar Laxmankumar 《Environmental science and pollution research international》2021,28(36):49725-49742
Environmental Science and Pollution Research - Nutrient source and transport study in tropical creeks adjacent to megacities are sparse on a regional and global scale. High-frequency chemical data... 相似文献
2.
Material suppliers and industrial metabolism 总被引:1,自引:1,他引:0
Arnold Tukker Avtar S. Jasser René Kleijn 《Environmental science and pollution research international》1997,4(2):113-120
Life Cycle Assessment (LCA) is not sufficiently tailored to the analysis of strategic environmental problems of material suppliers. Sustainable development calls for a reduction by a factor of 10 to 20 in the material intensity of the economy, a situation which leads to dramatic shifts in markets for raw materials. Furthermore, a material supplier might have major improvement options in the material’s numerous downstream uses. LCAs, however, can’t cover these two aspects. An adapted form of Substance Flow Analysis (SFA) may be an answer. This approach defines a system in relation to the flow of a specific material through society. All environmental interventions related to the material are inventoried. An emission evaluation indicates the dominant environmental bottlenecks, given the current market volume of each application of the material. This helps to identify improvement options and strategic choices in market portfolios. Scenario analysis on potential measures can further indicate changes of material flows — and thus markets — in the system. The approach is illustrated with a case study on chlorine. 相似文献
3.
4.
Wilson S. Clayton David H. Bass Neil M. Ram Christopher H. Nelson 《补救:环境净化治理成本、技术与工艺杂志》1996,6(4):15-29
In-situ sparging has been accepted as a method to rapidly remediate groundwater at considerably lower costs compared to remedies based on groundwater recovery alone. The success of in-situ sparging depends on effective mass transfer between air and contaminated media in the subsurface. Factors affecting mass transfer include advective airflow, diffusive transport, interphase chemical partitioning, and chemical and biological reaction rates between sparged gases and subsurface contaminants, minerals, and naturally occurring organic compounds. Understanding these factors can increase the design efficiency of in-situ sparging and assist in developing sparging systems that use gases other than air (i.e., oxygen, ozone, and methane). 相似文献
5.
Bhanu Pratap Ram M.V. Nitin 《Journal of Loss Prevention in the Process Industries》2005,18(4-6):283-292
An approach, based purely on steady-state analyses, for synthesizing effective control structures for reactive distillation (RD) columns is presented. The main idea is to analyze the steady-state relationships between the manipulated (input) variables and the potential controlled (output) variables to identify input–output (IO) pairings that are sensitive and avoid steady-state multiplicities providing a large range of nearly linear operating region around the base case design. Traditional SISO control loops are then implemented using these IO pairings to obtain control structures that maintain the column near the design product purity and conversion for the anticipated primary disturbances. The Niederlinski Index is used to eliminate dynamically unstable pairings in control structures with multiple loops. The approach is demonstrated on an example MTBE RD column. The impact of steady-state multiplicities on control structure design is highlighted. 相似文献
6.
Trivedi Suverna Prasad Ram Mishra Ashuthosh Kalam Abul Yadav Pankaj 《Environmental science and pollution research international》2020,27(32):39977-40000
Environmental Science and Pollution Research - Compressed natural gas is an alternative green fuel for automobile industry. Recently, the Indian government is targeting to replace all the... 相似文献
7.
Macías-Vargas José-Alberto Campos-Mañas Marina Celia Agüera Ana Sánchez Pérez José Antonio Ramírez-Zamora Rosa-María 《Environmental science and pollution research international》2021,28(19):24008-24022
Environmental Science and Pollution Research - In this work, the activated persulfate oxidation of ciprofloxacin (CIP) using a low-grade titanium ore under sunlight or simulated sunlight were... 相似文献
8.
Cordoba Aldo Hernández Rafael Viveros-Palma Iliana Mendoza Sandra Guevara-González Ramón Gerardo Feregrino-Pérez Ana Angélica Esquivel Karen 《Environmental science and pollution research international》2021,28(28):37130-37141
Environmental Science and Pollution Research - Nowadays, the use of different nanoscale structures has been introduced to a large number of research areas. One of these is the treatment and... 相似文献
9.
Environmental Science and Pollution Research - Data (N = 11614) from National Health and Nutrition Examination Survey (NHANES) for 1999–2016 for US adults aged ≥ 20 years were analyzed... 相似文献
10.
Kumar Gaurav Richa Srivastava Jai Gopal Sharma Ram Singh Vishrut Singh 《International Journal of Green Energy》2016,13(3):320-327
Biodiesel provides a feasible solution to the twin crisis of energy security and environmental concerns prevalent today, and it can be extracted from conventional oil crops as well as microalgae. However, lipid productivity in case of microalgae is much higher and has several advantages as compared with crop plants, so it is a better feedstock for biodiesel. In case of Chlorella pyrenoidosa, the heterotrophic cultured cells were found to be better in terms of lipid production, and ultimately biodiesel production, but the bottleneck is that in this mode glucose is used to feed the cells, which amounts to almost 80% of the total cost of biodiesel production. The purpose of this study is to evaluate and highlight the feasibility of using the industrially cheap cane molasses as a carbon source in place of glucose for a large-scale, low-cost lipid production of Chlorella pyrenoidosa. When treated molasses was used as a carbon source instead of glucose, the biomass sharply increases from 0.89 to 1.22 g L–1. On the other hand, the total lipid content increases from 0.27 to 0.66 g g–1. The specific growth rate and yield was higher in treated molasses as compared with that in glucose-supplemented. A mathematical model was also developed based on logistic, Luedeking–Piret, and Luedeking-Piret-like equations. Model predictions were in satisfactory agreement with the measured data, and the mode of lipid production was growth-associated. 相似文献