Optimizing Heat Treat Processes Through State-of-the-Art Metal Cleaning Capabilities

2021 ◽  
Author(s):  
Stefan Lukowski ◽  
Michael Onken
Keyword(s):  
Environmental Protection Agency ◽  
State Of The Art ◽  
Key Factors ◽  
Process Step ◽  
Heat Treat ◽  
Cleaning Agent ◽  
The Us ◽  
Underlying Causes ◽  
Vacuum Cleaning ◽  
Cleaning Technology

Abstract Metal cleaning has the potential to make or break heat treat processes. However, many heat treat companies are struggling with common cleaning challenges, including residual contaminations leading to insufficient hardening/nitriding/brazing results; surface stains on the finished products; inconsistent cleaning process as well as high cleaning costs due to high consumption of cleaning agent. In addition, burned oil can cause increased maintenance costs of the equipment and contaminate the facilities. The decision for a cleaning agent or sustainable cleaning technology has become more and more important under the aspect of current legislative efforts by the Environmental Protection Agency (EPA) in the US. This paper discusses the underlying causes behind these challenges and explains key factors fundamental to ensuring high-quality metal cleaning in terms of consistency, reliability and sustainability. Furthermore, it will introduce legally compliant, state-of-the-art cleaning capabilities such as closed vacuum cleaning technology with solvent, also known as airless system, the combined (two-step-) process of solvent and water in one machine; as well as a simple one-process step with two solvent based media. The theoretical principles will be further illustrated through a joint study with HEMO GmbH (HEMO), a manufacturer of cleaning machines, on cleaning trials based on different metals and contaminations.

scholarly journals The production of valuable products and fuel from plastic waste in Africa

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
M. Opoku Amankwa ◽  
E. Kweinor Tetteh ◽  
G. Thabang Mohale ◽  
G. Dagba ◽  
P. Opoku
Keyword(s):  
Environmental Protection Agency ◽  
Road Construction ◽  
Plastic Waste ◽  
Liquid Fuels ◽  
Environmental Costs ◽  
Waste Generation ◽  
Sustainable Environment ◽  
Trade Offs ◽  
The Us ◽  
Shipping Containers

AbstractGlobal plastic waste generation is about 300 million metric tons annually and poses crucial health and environmental problems. Africa is the second most polluted continent in the world, with over 500 shipping containers of waste being imported every month. The US Environmental Protection Agency (EPA) report suggests that about 75% of this plastic waste ends up in landfills. However, landfills management is associated with high environmental costs and loss of energy. In addition, landfill leachates end up in water bodies, are very detrimental to human health, and poison marine ecosystems. Therefore, it is imperative to explore eco-friendly techniques to transform plastic waste into valuable products in a sustainable environment. The trade-offs of using plastic waste for road construction and as a component in cementitious composites are discussed. The challenges and benefits of producing liquid fuels from plastic waste are also addressed. The recycling of plastic waste to liquid end-products was found to be a sustainable way of helping the environment with beneficial economic impact.

scholarly journals The Impact of Policy Measures on Human Mobility, COVID-19 Cases, and Mortality in the US: A Spatiotemporal Perspective

2021 ◽  
Vol 18 (3) ◽  
pp. 996
Author(s):  
Yun Li ◽  
Moming Li ◽  
Megan Rice ◽  
Haoyuan Zhang ◽  
Dexuan Sha ◽  
...  
Keyword(s):  
Growth Rate ◽  
Human Mobility ◽  
Public Information ◽  
Key Factors ◽  
Information Campaigns ◽  
Rapid Spread ◽  
The Us ◽  
Policy Measures ◽  
The Impact ◽  
At Home

Social distancing policies have been regarded as effective in containing the rapid spread of COVID-19. However, there is a limited understanding of policy effectiveness from a spatiotemporal perspective. This study integrates geographical, demographical, and other key factors into a regression-based event study framework, to assess the effectiveness of seven major policies on human mobility and COVID-19 case growth rates, with a spatiotemporal emphasis. Our results demonstrate that stay-at-home orders, workplace closures, and public information campaigns were effective in decreasing the confirmed case growth rate. For stay-at-home orders and workplace closures, these changes were associated with significant decreases (p < 0.05) in mobility. Public information campaigns did not see these same mobility trends, but the growth rate still decreased significantly in all analysis periods (p < 0.01). Stay-at-home orders and international/national travel controls had limited mitigation effects on the death case growth rate (p < 0.1). The relationships between policies, mobility, and epidemiological metrics allowed us to evaluate the effectiveness of each policy and gave us insight into the spatiotemporal patterns and mechanisms by which these measures work. Our analysis will provide policymakers with better knowledge regarding the effectiveness of measures in space–time disaggregation.

scholarly journals Potential Chemicals from Plastic Wastes

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3175
Author(s):  
Ravindra Prajapati ◽  
Kirtika Kohli ◽  
Samir K. Maity ◽  
Brajendra K. Sharma
Keyword(s):  
Environmental Protection Agency ◽  
State Of The Art ◽  
Plastic Waste ◽  
Chemical Production ◽  
Protection Agency ◽  
Medical Apparatus ◽  
Plastic Materials ◽  
Future System ◽  
Plastic Wastes ◽  
The U.S

Plastic is referred to as a “material of every application”. From the packaging and automotive industries to the medical apparatus and computer electronics sectors, plastic materials are fulfilling demands efficiently. These plastics usually end up in landfills and incinerators, creating plastic waste pollution. According to the Environmental Protection Agency (EPA), in 2015, 9.1% of the plastic materials generated in the U.S. municipal solid waste stream was recycled, 15.5% was combusted for energy, and 75.4% was sent to landfills. If we can produce high-value chemicals from plastic wastes, a range of various product portfolios can be created. This will help to transform chemical industries, especially the petrochemical and plastic sectors. In turn, we can manage plastic waste pollution, reduce the consumption of virgin petroleum, and protect human health and the environment. This review provides a description of chemicals that can be produced from different plastic wastes and the research challenges involved in plastic waste to chemical production. This review also provides a brief overview of the state-of-the-art processes to help future system designers in the plastic waste to chemicals area.

Identifying Key Safety Culture Factors for the Offshore Industry

2021 ◽  
Author(s):  
Ning Lou ◽  
Ezra Wari ◽  
James Curry ◽  
Kevin McSweeney ◽  
Rick Curtis ◽  
...  
Keyword(s):  
Safety Culture ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Transportation Safety ◽  
Key Factors ◽  
Gas Industry ◽  
The Us ◽  
Offshore Industry ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This research identifies key factors, or safety culture categories, that can be used to help describe the safety culture for the offshore oil and gas industry and develop a comprehensive offshore safety culture assessment toolkit for use by the US Gulf of Mexico (GoM) owners and operators. Detailed questionnaires from selected safety culture frameworks of different industries were collected and analyzed to identify important safety culture factors and key questions for assessment. Safety frameworks from different associations were investigated, including the Center for Offshore Safety (COS), Bureau of Safety and Environmental Enforcement (BSEE), and the National Transportation Safety Board (NTSB). The safety culture factors of each of these frameworks were generalized and analyzed. The frequency of the safety culture factors in each framework was analyzed to explore commonality. The literature review and analysis identified a list of common factors among safety culture frameworks.

The World Economy

2004 ◽  
Vol 187 ◽  
pp. 8-35
Keyword(s):  
World Economy ◽  
Key Factors ◽  
The Us ◽  
The World ◽  
Sustainable Recovery ◽  
The Eu

The two key factors underlying our forecast this quarter are the continued depreciation of the US$, which is about 4½ per cent weaker in effective terms than in October and 18 per cent below its recent peak in early 2002, and the emergence of what appears to be a sustainable recovery in Japan. Our projections for world growth this year incorporate significant upward revisions for the world's two largest economies, the US and Japan, while the outlook for the EU and Canada remains largely unchanged, although they also gain modest support from stronger demand in the US and Asia.

scholarly journals PM2.5 and Ozone Air Pollution Levels Have Not Dropped Consistently Across the US Following Societal Covid Response

2020 ◽  
Author(s):  
Bujin Bekbulat ◽  
Joshua S. Apte ◽  
Dylan B Millet ◽  
Allen Robinson ◽  
Kelley C. Wells ◽  
...  
Keyword(s):  
Air Pollution ◽  
Environmental Protection Agency ◽  
Fine Particulate Matter ◽  
Pollution Levels ◽  
Secondary Pollutants ◽  
The Us ◽  
Many Sources ◽  
Primary Pollutant ◽  
Ozone Levels ◽  
At Home

<p>Analysis of a large national dataset of fine particulate matter (PM2.5) and ozone air pollution from the US Environmental Protection Agency indicate opposing differences in average concentrations during the covid response period, relative to expected levels. These are the two most important pollutants in terms of public health impacts and regulatory non-attainment in the US. Post-covid response, average PM2.5 levels are slightly higher (~5%) than expected; average ozone levels are slightly lower (~5%). The size of post-response ozone anomaly has decreased with time and by week 6 after the first stay-at-home order was enacted (April 29- May 5, 2020), ozone levels were higher than expected. In addition, no individual US state had lower-than-expected PM2.5 and ozone for all weeks post- covid response. Two non-covid factors, meteorology and regional transport, do not fully explain observed trends. These findings are unexpected given the large reduction in many household’s activities associated with “stay at home” and other covid responses. We hypothesize that this result partly arises from the fact that ozone and the majority of PM2.5 are secondary pollutants formed in the atmosphere from emissions from many sources (i.e., not just traffic). Preliminary analysis of nitrogen dioxide (NO2) data in a few cities reveals substantially lower-than-expected (~30%) concentrations post-covid. NO2 is a primary pollutant and is much more strongly associated with traffic than PM2.5 or ozone. </p><p><br></p>

scholarly journals Simulation of a biogas cleaning process using different amines

2018 ◽  
Vol 27 (47) ◽  
Author(s):  
Guillermo Sepúlveda ◽  
Luis Eduardo Jaimes ◽  
Leonardo Pacheco ◽  
Carlos Alirio Díaz
Keyword(s):  
Environmental Protection Agency ◽  
Landfill Gas ◽  
Cleaning Process ◽  
Fuel Gas ◽  
Combustion Properties ◽  
The Us ◽  
Us Epa ◽  
Combustible Gases ◽  
Combustion Processes ◽  
Landfill Gas Emissions

The use of biogas generated in landfills has gained importance in developing countries like Colombia. Taking into account that this biogas presents poor combustion properties that make interchangeability with other combustible gases difficult, the elimination of gases and vapors, such as CO2 and H2O, through a cleaning process, in which the biogas is converted to biomethane, improves the biogas properties as a fuel gas for general use. In this work, we simulated the generation of biogas at El Carrasco sanitary landfill in Bucaramanga, using the US EPA (United States Environmental Protection Agency) landfill gas emissions model. Additionally, we simulated the biogas cleaning process to extract the remaining moisture using the ProMax software; for this, we used three different amines (MDEA, MEA, and DEA), followed by a glycol dehydration process. The results showed that the amine MEA produced the largest increase in the concentration of CH4 (90.37 %) for the biogas generated in the landfill. Furthermore, dehydration with glycol was an efficient process to obtain a gas with a high percentage of methane (91.47 %) and low water presence (1.27 %); this would allow the use of biomethane in conventional industrial combustion processes and power generation.

scholarly journals Road to the Civil War: The Missouri Compromise

Perceptions ◽  
2018 ◽  
Vol 4 (2) ◽  
pp. 5
Author(s):  
Julius Nathan Fortaleza Klinger
Keyword(s):  
United States ◽  
Nineteenth Century ◽  
Civil War ◽  
The United States ◽  
Research Paper ◽  
Early Nineteenth Century ◽  
True Solution ◽  
Secondary Sources ◽  
The Us ◽  
Underlying Causes

The purpose of this paper is to explore the question of whether or not early nineteenth-century lawmakers saw the Missouri Compromise of 1820 as a true solution to the question of slavery in the United States, or if it was simply a stopgap solution. The information used to conduct this research paper comes in the form of a collation of primary and secondary sources. My findings indicate that the debate over Missouri's statehood was in fact about slavery in the US, and that the underlying causes of the Civil War were already quite prevalent four whole decades before the conflict broke out.

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