scholarly journals An Evaluation of Input–Output Value for Sustainability in a Chinese Steel Production System Based on Emergy Analysis

2018 ◽  
Vol 10 (12) ◽  
pp. 4749 ◽  
Author(s):  
Fengjiao Ma ◽  
A. Egrinya Eneji ◽  
Yanbin Wu
Keyword(s):  
Production System ◽  
Steel Production ◽  
Pollutant Emissions ◽  
Emergy Analysis ◽  
Input Output ◽  
Sustainability Index ◽  
Output Index ◽  
Steel Making ◽  
Load Rate ◽  
Emergy Value

: The social investment, natural resource consumption, and pollutant emissions involved in steel production can be evaluated comprehensively using the emergy analysis. We explored the sustainability of the steel production system from four aspects: input index, output index, input–output index, and sustainability index. The results showed that the maximum inputs were the intermediate product/recyclable materials produced within the production line; energy sources were mainly non-renewable and the emergy value of pollutants discharged was rather low. The environmental load rate of the pelletizing and sintering processes were the highest and the proportion of recycled materials for puddling and steel-making were the highest. The emergy investment rate of rolling was the highest; the emergy value of the pollutants discharged in each process was very small, and the emergy yield ratio was highest in the rolling process. Pelletizing, sintering, and steel-making were input consuming processes, but the sustainability index of puddling and rolling processes was sound. The whole process line can be sustainable, considering the useful intermediate and recyclable products.

scholarly journals Environmental Sustainability Assessment of a New Sewage Treatment Plant in China Based on Infrastructure Construction and Operation Phases Emergy Analysis

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 484 ◽  
Author(s):  
Junxue Zhang ◽  
Lin Ma
Keyword(s):  
Environmental Sustainability ◽  
Sustainability Assessment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Emergy Analysis ◽  
Nonrenewable Resource ◽  
Sustainability Index ◽  
System A ◽  
Emergy Value

Due to excessive resource consumption and pressing environmental issues of the sewage treatment industry, there is extensive attention in China. Given the unique craft production process in the sewage treatment system, a series of integral emergy indicators have been used to evaluate the environmental sustainability based on infrastructure construction and operation stage emergy analysis. Taking a new typical sewage treatment plant as an example, this paper performed a case study. The results illustrate that (1) the infrastructure construction process emergy (approximate 92.6%) is more critical than sewage treatment process emergy; (2) nonrenewable resource is the primary factor for the emergy analysis, followed by energy (23.5%) and purchased supply (7%); (3) cement, steel, and gravel have dominant impacts on the nonrenewable resource emergy; (4) the emergy sustainability index is 0.001101, which displays weak environmental sustainability; (5) the unit emergy value (UEV) of the new sewage treatment plant is 3.40 × 1012 sej/m3; (6) sensitivity analysis results of the hypothesis demonstrate that nonrenewable resources have significant fluctuations (6.903%) while, for the indicators, emergy sustainability index (ESI) (4.8072%) has the most significant impact; and (7) wastewater is a major contributor. In light of comprehensive discussions, two positive measures are proposed in order to ameliorate the environmental sustainability.

Processing and Recycling Experiments of Dust from Electric Arc Furnace

2011 ◽  
Vol 378-379 ◽  
pp. 719-722 ◽  
Author(s):  
Zorica Bacinschi ◽  
Cristiana Zizi Rizescu ◽  
Elena Valentina Stoian ◽  
Dan Nicolae Ungureanu ◽  
Aurora Anca Poinescu ◽  
...  
Keyword(s):  
Steel Production ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Raw Material ◽  
Arc Furnace ◽  
Leaching Test ◽  
Fine Grained ◽  
Steel Making ◽  
Fine Grained Material ◽  
The Impact

The processing and recycling experiments of dust from Electric Arc Furnace (EAF) in industrial conditions aimed at highlighting the minimizing possibility of this waste by transforming it into a by-product that can represent either a secondary raw material for steel making in EAF or to recover iron, zinc and lead (the Waltz process). Electric-arc furnace dust (EAFD) is a by-product of steel production and recycling. This fine-grained material contains high amounts of zinc and iron as well as significant amounts of potentially toxic elements such as lead, cadmium and chromium. Therefore, the treatment and stabilization of this industrial residue is necessary. Leaching test is a method of evaluating the impact of waste that is stored (soil, water table).

scholarly journals A Comparative Cost Disadvantage Driven By Foreign Competition

2011 ◽  
Vol 8 (7) ◽  
Author(s):  
Amaechi Nkemakolem Nwaokoro
Keyword(s):  
Economies Of Scale ◽  
Positive Impact ◽  
Steel Production ◽  
Foreign Competition ◽  
Trade Restrictions ◽  
Steel Making ◽  
Steel Output ◽  
The Us ◽  
Steel Import ◽  
The Impact

This study focuses on the impact of foreign physical steel imports on the output of the US steel industry. This industry faces a comparative disadvantage in costs and from reduced utilized capacity in steel making. The strong desire of many foreign steel producers to export steel to the US lucrative market led to their plant modernization with the associated economies of scale. This led to steel import surge in America. The imposed trade restrictions had mixed outcomes. The domestic steel output is modeled as function of steel imports and from the size of the economy addressed by shipments. The OLS estimate of steel imports is insignificant and this could be explained by the ineffectiveness of the various instituted trade instruments, from increased foreign prices of steel, and from depreciated dollars at some points in time during the period in study. As expected the measure of the economyshipments variable has a positive impact on steel production.

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