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Chromium steel from chromite ore processing residue----A valuable construction material from a waste

Jay N. MEEGODA, Wiwat KAMOLPORNWIJIT

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2, Pages 159-166 doi: 10.1007/s11783-011-0325-3

Abstract: As species we humans generate excessive amounts of waste and hence for sustainability we should explore innovative ways to recover them. The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and stainless steel. In Hudson County, New Jersey, there are more than two million tons of leftover COPR. Part of COPR was used as fill materials for construction sites, which spread the problem to a larger area. With high solubility along with their toxicity leached chromate from COPR is threatening the environment as well as human health. In this research, COPR was thermally treated to recover iron with chromium by applying techniques used in steel manufacturing. An extensive experimental program was performed using a Thermo-Gravimetric Analyzer (TGA) and bench scale tests to thermally treat the processed chromium contaminated soils with carbon and sand at varying temperatures and under reducing environment. The optimum chemical composition of COPR and additives to be used in the melts were evaluated based upon the thermodynamic properties of the mixture to ensure good phase separation, least amounts of iron and chromium oxides in the slag and minimum variability of final product (steel or iron with chromium). The impact of other oxides on the steel making process was evaluated to minimize the adverse impact on the process. The research demonstrated the feasibility of recovering a valuable construction material (chrome steel) from a waste (COPR).

Keywords： chromite ore processing residue chromium steel reduction thermal treatment beneficial use

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Proline-2′-deoxymugineic acid, a phytosiderophore analog, drives beneficial rhizobacterial community

Frontiers of Agricultural Science and Engineering doi: 10.15302/J-FASE-2023531

Abstract:

● Proline-2′-deoxymugineic (PDMA) significantly altered the bacterial community in the peanut rhizosphere.

Keywords： Beneficial rhizobacteria recruitment peanut plant-soil micronutrition enhancement proline-2′-deoxymugineic

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Time reversal method for guided wave inspection in pipes

DENG Fei, WU Bin, HE Cunfu

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3, Pages 251-260 doi: 10.1007/s11465-008-0050-1

Abstract: Simulation results show that the time reversal array method is beneficial to the improvement of the signal-to-noise

Keywords： reversal process beneficial circumferential location energy number

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Antimicrobial use in food animal production: situation analysis and contributing factors

Ziping WU

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 3, Pages 301-311 doi: 10.15302/J-FASE-2018207

Abstract: antimicrobials are used, and reviewing different technical and socioeconomic factors influencing antimicrobial useat farm level, this study discusses the main knowledge gaps in antimicrobial use in food animal productionThe review reveals that antimicrobial use in food animals exhibit strong regional and species differences, and there are still large information gaps concerning the current state of antimicrobial use.and potential technological alternatives or alternative systems all have an impact on antimicrobial use

Keywords： antimicrobial use drivers for antimicrobial use food animal production

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Beneficial effects of preventive cholecystectomy in patients with hepatic cancer

LIU Anzhong, LI Jun, HUA Huwei

Frontiers of Medicine 2008, Volume 2, Issue 2, Pages 139-142 doi: 10.1007/s11684-008-0026-x

Abstract: There is no conclusive answer to the question whether excising gall bladder is helpful to the patient with hepatic cancer. The survival rate of patients with hepatic cancer for more than two years has been increased, and the incidence of complications of cholecystitis and gall stone are relatively higher among these patients, which may seriously complicate treatment of advanced hepatic cancer and decrease quality of life. The researchers conducted a prospective clinical investigation from 2002 to 2006 to assess the clinical significance of preventive cholecystectomy in patients with hepatic cancer. One hundred and eighteen cases of postoperative patients with hepatic cancer, who survived for more than two years, were followed up. Based on whether cholecystectomy was performed, the patients were divided into two groups including 48 cases with cholecystectomy and 70 cases with cholecyst reserved. The two-year morbidity of gall stone and morbidity of pain in the right upper abdomen of cholecyst reservation group were 54.29% and 68.57%, respectively, obviously higher than 0.00% and 20.83% of cholecystectomy group. Mainly for those treated with transcatheter arterial chemo-embolization, the morbidity of gall stone was 86.67% ( < 0.01). Therefore, preventive cholecystectomy is strongly recommended during hepatectomy to decrease the incidence of chronic cholecystitis and gall stone, especially for those whose chemotherapy and embolization will be carried out through hepatic artery and portal vein.

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Moving policy and regulation forward for single-use plastic alternatives

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 3, doi: 10.1007/s11783-021-1423-5

Abstract: Single-use plastics are often used once or cannot be reused for extended periods.The waste generated by single-use plastics threatens ecosystem health by entering the environment andThe innovation of sustainable and environmentally friendly single-use plastic alternative materials andthe public are promising technologies and management approaches that can solve the problem of single-useThe development of single-use plastic alternative products can be promoted fundamentally only by improving

Keywords： Single-use plastic alternatives Policy Regulation Sustainable development

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Ant colony optimization in continuous problem

YU Ling, LIU Kang, LI Kaishi

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 459-462 doi: 10.1007/s11465-007-0079-6

Abstract: The algorithm is efficient and beneficial to the study of the ant colony optimization in a continuous

Keywords： beneficial algorithm efficient continuous ACO

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Nudging sustainable consumption of residential energy use: A behavioral economics perspective

Frontiers of Engineering Management Pages 540-545 doi: 10.1007/s42524-023-0264-2

Abstract: Nudging sustainable consumption of residential energy use: A behavioral economics perspective

Keywords： consumption energy use

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Beneficial metabolic activities of inflammatory cytokine interleukin 15 in obesity and type 2 diabetes

Jianping Ye

Frontiers of Medicine 2015, Volume 9, Issue 2, Pages 139-145 doi: 10.1007/s11684-015-0377-z

Abstract: In this review article, interleukin 15 (IL-15) is used as a new example to explain the beneficial effects

Keywords： inflammation obesity cytokine energy expenditure insulin resistance

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Approaches to achieve high grain yield and high resource use efficiency in rice

Jianchang YANG

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 2, Pages 115-123 doi: 10.15302/J-FASE-2015055

Abstract: This article discusses approaches to simultaneously increase grain yield and resource use efficiencyindex are three important approaches to achieving the dual goal of high grain yield and high resource useDeeper root distribution and higher leaf photosynthetic N use efficiency at lower N rates could be usedseason, and non-flooded straw mulching cultivation, could substantially increase grain yield and water usesynergistic interaction between water and N on crop and soil and the mechanism underlying high resource use

Keywords： rice nitrogen-efficient cultivar grain fill harvest index nitrogen use efficiency water use efficiency

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Increasing significance of advanced physical/chemical processes in the development and application of sustainable wastewater treatment systems

RULKENS Wim

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 4, Pages 385-396 doi: 10.1007/s11783-008-0073-1

Abstract: Currently, there is an increasing need for the beneficial reuse of treated wastewater and to recoverrequired for reuse of the effluent, recovery of valuable components and energy from the wastewater for beneficial

Keywords： control beneficial valuable scarcity Development

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The road to sustainable use and waste management of plastics in Portugal

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1, Pages 5-5 doi: 10.1007/s11783-021-1439-x

Abstract:

• Portugal recycles 34% of the 40 kg/hab year of plastic packaging waste.

Keywords： Single-use plastics Plastic packaging Plastic waste Waste management Waste shipment Lightweight

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STRATEGIES FOR IMPROVING WATER USE EFFICIENCY IN DRYLAND AGROECOSYSTEMS

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4, Pages 599-602 doi: 10.15302/J-FASE -2021409

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WATER USE IN HUMAN CIVILIZATIONS: AN INTERDISCIPLINARY ANALYSIS OF A PERPETUAL SOCIAL-ECOLOGICAL CHALLENGE

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4, Pages 512-524 doi: 10.15302/J-FASE -2021393

Abstract: Solutions to the dilemma will require broad stakeholder-based agreements on water use taking into accountthe available data on water resources, their current and potential use efficiency, recycling of water

Keywords： agroecology historical water use water footprint water governance urbanization

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Effects of dwarfing genes on water use efficiency of bread wheat

Jiakun YAN, Suiqi ZHANG

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 2, Pages 126-134 doi: 10.15302/J-FASE-2017134

Abstract: Climate change has increased the risk of drought, which significantly limits plant productivity. Various ways of increasing water availability and sustaining growth of crop plants in drought-prone environments are available. Genetic advances in grain yields under rainfed conditions have been achieved with the introduction of dwarfing genes. A thorough understanding of the effects of different dwarfing genes on root growth, coleoptile length, grain yields and water using efficiency (WUE) will provide opportunities to select appropriate genes for breeding high WUE and grain yield cultivars. This review focuses on the mechanism involved in genes that reduce plant height and affect root and coleoptile length, their consequent effects on grain yields and WUE, and suggests that for rainfed and irrigation-limited environments, combining GAR and GAI dwarfing genes in breeding may help boost WUE and yields, and more materials from different parental sources should be collected to assess opportunities for potential comprehensive application of specific genes.

Keywords： coleoptile length wheat dwarfing genes grain yield root water use efficiency