scholarly journals Environmental Assessment of Recyclable Waste Valorization in United Arab Emirates

2021 ◽  
Vol 897 (1) ◽  
pp. 012024
Author(s):  
A Elfeky ◽  
M Abdallah ◽  
K Fattah
Keyword(s):  
United Arab Emirates ◽  
Positive Impact ◽  
Management Strategies ◽  
High Energy ◽  
Energy Yield ◽  
Waste Valorization ◽  
Carbon Footprints ◽  
Material Recovery ◽  
Solid Waste Generation ◽  
Promising Solution

Abstract The United Arab Emirates (UAE) has one of the largest per capita carbon footprints and solid waste generation rates in the world. In preparation for the post-oil future, the UAE has planned to diversify its energy mix with renewable sources. Waste valorization, particularly material and energy recovery (MER), presents a promising solution for the waste and energy challenges of the future. It is thus of great importance to ensure that the shift to MER systems lead to a concomitant positive impact on the environment. This research aims to assess the environmental impacts of selected waste management strategies incorporating MER systems in the UAE. The study is focused on the valorization of recyclable wastes through incinerators and/or material recovery facilities (MRFs) compared to existing landfill practices. The mass burn strategy increased the energy produced by 88% compared to the combined MER strategy due to the high energy yield of recyclables. It was found that combining energy and material recovery was the optimum environmental option in terms of global warming and abiotic depletion. The mass burn strategy had a favourable positive impact on freshwater aquatic ecotoxicity and human toxicity, yet it resulted in the highest acidification potential (ACP) and eutrophication potential (ETP). On the other hand, the MRF strategy achieved positive ACP and ETP impacts. Overall, all MER-based strategies achieved better environmental performance compared to existing landfilling practices

Optimizing genotype-environment-management interactions to ensure silage maize production in the Chinese Maize Belt

2020 ◽  
Vol 80 (2) ◽  
pp. 133-146
Author(s):  
L Zhang ◽  
Z Zhang ◽  
J Cao ◽  
Y Luo ◽  
Z Li
Keyword(s):  
Field Experiments ◽  
Weather Conditions ◽  
Growth Cycle ◽  
High Energy ◽  
Risk Level ◽  
Energy Yield ◽  
Maize Production ◽  
Early Date ◽  
Environment Management ◽  
Silage Maize

Grain maize production exceeds the demand for grain maize in China. Methods for harvesting good-quality silage maize urgently need a theoretical basis and reference data in order to ensure its benefits to farmers. However, research on silage maize is limited, and very few studies have focused on its energetic value and quality. Here, we calibrated the CERES-Maize model for 24 cultivars with 93 field experiments and then performed a long-term (1980-2017) simulation to optimize genotype-environment-management (G-E-M) interactions in the 4 main agroecological zones across China. We found that CERES-Maize could reproduce the growth and development of maize well under various management and weather conditions with a phenology bias of <5 d and biomass relative root mean square error values of <5%. The simulated results showed that sowing long-growth-cycle cultivars approximately 10 d in advance could yield good-quality silage. The optimal sowing dates (from late May to July) and harvest dates (from early October to mid-November) gradually became later from north to south. A high-energy yield was expected when sowing at an early date and/or with late-maturing cultivars. We found that Northeast China and the North China Plain were potential silage maize growing areas, although these areas experienced a medium or even high frost risk. Southwestern maize experienced a low risk level, but the low soil fertility limited the attainable yield. The results of this paper provide information for designing an optimal G×E×M strategy to ensure silage maize production in the Chinese Maize Belt.

scholarly journals Optimization of Lutein Recovery from Tetraselmis suecica by Response Surface Methodology

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 182
Author(s):  
Kang Hyun Lee ◽  
Ye Won Jang ◽  
Hansol Kim ◽  
Jang-Seu Ki ◽  
Hah Young Yoo
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
High Energy ◽  
Solid Loading ◽  
Control Group ◽  
Energy Yield ◽  
Tetraselmis Suecica ◽  
Antioxidant Power

Microalgae have been attracting attention as feedstock for biorefinery because they have various advantages, such as carbon fixation, high growth rate and high energy yield. The bioactive compounds and lutein contained in microalgae are known to be beneficial for human health, especially eye and brain health. In this study, in order to improve the recovery of bioactive extracts including lutein from Tetraselmis suecica with higher efficiency, an effective solvent was selected, and the extraction parameters such as temperature, time and solid loading were optimized by response surface methodology. The most effective solvent for lutein recovery was identified as 100% methanol, and the optimum condition was determined (42.4 °C, 4.0 h and 125 g/L biomass loading) by calculation of the multiple regression model. The maximum content of recovered lutein was found to be 2.79 mg/mL, and the ABTS radical scavenging activity (IC50) and ferric reducing antioxidant power (FRAP) value were about 3.36 mg/mL and 561.9 μmol/L, respectively. Finally, the maximum lutein recovery from T. suecica through statistical optimization was estimated to be 22.3 mg/g biomass, which was 3.1-fold improved compared to the control group.

scholarly journals Repercussions of COVID-19 pandemic on solid waste generation and management strategies

2021 ◽  
Vol 15 (6) ◽  
Author(s):  
Yangyang Liang ◽  
Qingbin Song ◽  
Naiqi Wu ◽  
Jinhui Li ◽  
Yuan Zhong ◽  
...  
Keyword(s):  
Solid Waste ◽  
Management Strategies ◽  
Waste Generation ◽  
Solid Waste Generation

Potential contribution of the wastewater sector to energy supply

2011 ◽  
Vol 63 (8) ◽  
pp. 1765-1771 ◽  
Author(s):  
S. Heubeck ◽  
R. M. de Vos ◽  
R. Craggs
Keyword(s):  
New Zealand ◽  
Potential Energy ◽  
Biological Treatment ◽  
High Energy ◽  
Technology Selection ◽  
Energy Yield ◽  
Potential Contribution ◽  
Energy Potential ◽  
Treatment Technologies ◽  
Future Potential

The biological treatment of wastewater could yield high energy fuels such as methane and alcohols, however most conventional treatment systems do not recover this energy potential. With a simple model of the energy yields of various wastewater treatment technologies it is possible to demonstrate how minor shifts in technology selection can lead the industry from being identified as predominantly energy intensive, to being recognised as a source of energy resources. The future potential energy yield is estimated by applying energy yield factors to alternative use scenarios of the same wastewater loads. The method for identifying the energy potential of wastewater was demonstrated for the New Zealand wastewater sector, but can equally be applied to other countries or regions. The model suggests that by using technologies that maximise the recovery of energy from wastewater, the potential energy yield from this sector would be substantially increased (six fold for New Zealand).

Efficient Power Management Strategies for High-Energy-Demanding Industrial Plants

2020 ◽  
pp. 279-297
Author(s):  
Libero Paolucci ◽  
Mostafa Abdollahi ◽  
Francesco Grasso ◽  
Alberto Reatti ◽  
Fabio Corti
Keyword(s):  
Power Management ◽  
Management Strategies ◽  
High Energy ◽  
Industrial Plants ◽  
Efficient Power

scholarly journals Basic Passive Side-Day lighting Considerations for High Rise office Building

2020 ◽  
Vol 9 (5) ◽  
pp. 78-87
Keyword(s):  
Energy Consumption ◽  
Construction Industry ◽  
Positive Impact ◽  
Building Design ◽  
High Energy ◽  
Office Building ◽  
High Rise ◽  
Design Considerations ◽  
System A ◽  
Modern Era

High rise office building design is one of the essential buildings in construction industry due to the limited space especially in the urban area. After home, a high rise office building is an important space for human in modern era. Due to the issue of high energy consumption especially inefficient artificial light strategy, side-day lighting becomes the best solution for a high rise office building design. Despite providing efficient energy consumption, side-day lighting creates a positive impact to the worker as well as the office's indoor environment. Hence, this paper aims to explore the basic passive side-day lighting considerations that educate people especially for those who are involved in the building construction industry. Beside, this paper focuses on the passive design considerations due to the various advantages that not involved especially with complex electrical and mechanical system. A systematic literature review is the main methodology for this paper to identify the basic passive side-day lighting considerations for a high rise office building design. Base on this research, it revealed that eight elements for building design considerations should be applied to provide a better day lighting impact for a high rise office building design. Considerations for non-building design aspects should also need to be applied since those aspects contribute to produce a better day lighting impact for a high rise office building design.

scholarly journals Impact of goat population management strategies on goat meat production in Bangladesh

2020 ◽  
pp. 118-126
Author(s):  
F Yasmin ◽  
KS Huque ◽  
SA Chowdhury ◽  
MAH Miyan
Keyword(s):  
Mortality Rate ◽  
Positive Impact ◽  
Management Strategies ◽  
Population Management ◽  
Base Rate ◽  
Meat Production ◽  
Goat Meat ◽  
Goat Population ◽  
Productivity Management ◽  
Meat Productivity

To increase goat-meat production, this study has been aimed to evaluate goat-meat production potentiality using different management strategies of goat-population rather than goat-meat productivity management in Bangladesh. Simulation Matrix (SIMM) model was used under three scenarios of goat-population management strategies such as Scenario1(Base rate): 2 kids/year production with 30% kid mortality, Scenario 2: Production of 6 kids/year with 30% kid mortality and Scenario 3: Production of 6 kids/year with 10% kid mortality to analyze their impact on goat-meat production in Bangladesh. Results showed on average only 270.09 thousand ton /year of goat-meat can produce at the existing rate (2 kids Production/year with 30% kid mortality). If it is possible to increase kid production up to 6 then can produce on average 23714.4 thousand ton/year of goat-meat. Further, it is possible to reduce the kid mortality rate up to 10%, goat-meat is the highest 932430.0 thousand ton/year. Result indicated a great positive impact of goat-population management strategies on goat-meat production. Therefore, 10% kid mortality rate with 6 kids/year production of goat-population management could be suitable management or best strategy for higher goat-meat production in Bangladesh. Bangladesh J. of Livestock Res. 21-25: 118-126, 2018

scholarly journals Assessment of Wind Characteristics and Wind Power Potential of Gharo, Pakistan

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Zahid Hussain Hulio
Keyword(s):  
Wind Turbine ◽  
Wind Power ◽  
Frequency Distribution ◽  
Cost Estimation ◽  
Wind Farm ◽  
Research Work ◽  
Economic Assessment ◽  
High Energy ◽  
Energy Yield ◽  
Wind Characteristics

The objective of this research work is to assess the wind characteristics and wind power potential of Gharo site. The wind parameters of the site have been used to calculate the wind power density, annual energy yield, and capacity factors at 10, 30, and 50 m. The wind frequency distribution including seasonal as well as percentage of seasonal frequency distribution has been investigated to determine accurately the wind power of the site. The coefficient of variation is calculated at three different heights. Also, economic assessment per kWh of energy has been carried out. The site-specific annual mean wind speeds were 6.89, 5.85, and 3.85 m/s at 50, 30, and 10 m heights with corresponding standard deviations of 2.946, 2.489, and 2.040. The mean values of the Weibull k parameter are estimated as 2.946, 2.489, and 2.040 while those of scale parameter are estimated as 7.634, 6.465, and 4.180 m/s at 50, 30, and 10 m, respectively. The respective mean wind power and energy density values are found to be 118.3, 92.20, and 46.10 W/m2 and 1036.6, 807.90, and 402.60 kWh/m2. As per cost estimation of wind turbines, the wind turbine WT-C has the lowest cost of US$ Cents 0.0346/kWh and highest capacity factors of 0.3278 (32.78%). Wind turbine WT-C is recommended for this site for the wind farm deployment due to high energy generation and minimum price of energy. The results show the appropriateness of the methodology for assessing the wind speed and economic assessment at the lowest price of energy.

scholarly journals Study on Magnetite Ore Crushing Assisted by Microwave Irradiation

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1127
Author(s):  
Jiawang Hao ◽  
Qingwen Li ◽  
Lan Qiao
Keyword(s):  
Microwave Irradiation ◽  
Mining Industry ◽  
Damage Mechanism ◽  
Wave Impedance ◽  
High Energy ◽  
Rock Breaking ◽  
Energy Utilization ◽  
Magnetite Ore ◽  
Irradiation Power ◽  
Promising Solution

High energy consumption in ore crushing brings great challenges to the mining industry. Microwave irradiation provides a promising solution for rock breaking. However, there is currently a lack of detailed understanding of the microwave parameters regarding magnetite ore. The purpose of this study is to fully understand the potential value of microwave irradiation applied in auxiliary crushing of magnetite ore. It is typically found that increasing power reduces the mechanical properties of ore, increasing energy utilization, and crushing degree, more than extending time. Based on wave impedance, this reveals the dependence of energy utilization on thermal damage. Increasing irradiation power, time and cooling rate will cause more transgranular cracks and cleavage tears in the crushed ore. Based on the separate microwave response of several minerals, the microwave-damage mechanism of magnetite ore is further demonstrated.

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