scholarly journals „Disparater Tausch“

2001 ◽  
Vol 31 (124) ◽  
pp. 429-442
Author(s):  
Peter Custers
Keyword(s):  
Civil Wars ◽  
Raw Materials ◽  
Transnational Corporation ◽  
Terms Of Trade ◽  
Waste Products ◽  
Unequal Exchange

Financing civil wars in Africa depends of the export of raw materials like diamonds or oil as well on the side of government as on the side of rebels. Transnational corporation get big profits by these exports, especially in the monopolised sector of diamond industries. In result, there exists not only an “unequal exchange” because of bad terms of trade, but a “disparate exchange”: natural wealth is exchanged against waste products like weapons and the use of these weapons leads to further destruction and misery.

scholarly journals Rheological and Microbiological Characteristics of Hops and Hot Trub Particles Formed during Beer Production

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 681
Author(s):  
Monika Sterczyńska ◽  
Marek Zdaniewicz ◽  
Katarzyna Wolny-Koładka
Keyword(s):  
Rheological Properties ◽  
Raw Materials ◽  
Raw Material ◽  
Microbiological Analysis ◽  
Waste Products ◽  
Low Viscosity ◽  
Post Process ◽  
High Shear Rates ◽  
Different Temperatures ◽  
Beer Production

During the production of beer, and especially beer wort, the main wastes are spent grain and hot trub, i.e., the so-called “hot break.” Combined with yeast after fermentation, they represent the most valuable wastes. Hot trub is also one of the most valuable by-products. Studies on the chemical composition of these sediments and their rheological properties as waste products will contribute to their effective disposal and even further use as valuable pharmaceutical and cosmetic raw materials. So far, hot trub has been studied for morphology and particle distribution depending on the raw material composition and beer wort extract. However, there are no preliminary studies on the rheological properties of hot trub and hops. In particular, no attention has yet been paid to the dependence of these properties on the hop variety or different protein sources used. The aim of this study was to examine the effect of different hopping methods on hot trub viscosity and beer wort physicochemical parameters. Additionally, the hop solutions were measured at different temperatures. A microbiological analysis of hop sediments was also performed to determine the post-process survival of selected microorganisms in these wastes. For manufacturers of pumps used in the brewing industry, the most convenient material is that of the lowest viscosity. Low viscosity hot trub can be removed at lower velocities, which reduces costs and simplifies washing and transport. The sediments also had similar equilibrium viscosity values at high shear rates.

scholarly journals ANTIOXIDANT ACTIVATION OF ETHANOL EXTRACTS FROM PINEAPPLE LEAVES (Ananas comosus) AT TAC CAU REGION, KIEN GIANG PROVINCE

2020 ◽  
Vol 1 (40) ◽  
pp. 39-49
Author(s):  
Hau Thu Nguyen Thi ◽  
Dung Nhan Tran ◽  
Ba Van Huynh ◽  
Quyen Ngoc Thi ◽  
An Tran Hoang Bui ◽  
...  
Keyword(s):  
Nutritional Value ◽  
Extraction Efficiency ◽  
Raw Materials ◽  
Ananas Comosus ◽  
Total Polyphenol ◽  
Waste Products ◽  
Resistance To Oxidation ◽  
Ethanol Extracts ◽  
Pharmaceutical Production ◽  
Pineapple Leaves

Pineapple (Ananas comosus) is a kind of fruit with high nutritional value. This study investigated the resistance to oxidation DPPH (2,2-Diphenyl-1picrylhydrazyl (free radical) and deionized Fe3+ of ethanol extracts from theleaves (leaves grow on stems) and crown (crown of scale leaves) of pineapples. Study of high extraction efficiency in 99,5% ethanol solvent, mixing ratio between samples with the solvent is 1 : 4, combined ultrasonic wave with a capacity of 120 Walt within 72 hours. The total polyphenol content in all treatments was high: leave sample (140,9 ± 2,86 mg GAE/g) and crown sample (204,6 ± 0,29 mg GAE/g). The results showed thatDPPH oxidation resistance and deionized Fe3+ were: crown (IC50 = 254,74 ± 1,55 mg/mL và 908,12 ± 9,35 mg/mL) higher than leaves (IC50 = 977,78 ± 30,27m mg/mL and 2156,62 ± 23,03 mg/mL). Theresearch has found that the use of waste products from pineapple peels with antioxidant capacity could be added to potential raw materials in the field of pharmaceutical production.

scholarly journals Heterogeneity in the Chemical Composition of Biofertilizers, Potential Agronomic Use, and Heavy Metal Contents of Different Agro-Industrial Wastes

2019 ◽  
Vol 11 (7) ◽  
pp. 1995 ◽  
Author(s):  
Sabrina Cajamarca ◽  
Douglas Martins ◽  
Juscimar da Silva ◽  
Mariana Fontenelle ◽  
Ítalo Guedes ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Raw Materials ◽  
Chemical Characterization ◽  
Industrial Wastes ◽  
Chemical Compositions ◽  
Agronomic Efficiency ◽  
Waste Products ◽  
Metal Contents ◽  
Great Heterogeneity

Several agro-industrial, livestock, and food wastes can be recycled to create biofertilizers. This diversity of raw materials can result in nutritional imbalance and an increase in heavy metal content, which could make the final product unfeasible. Thus, the chemical characterization of the raw materials and their influence on the sustainable and safe production of biofertilizers need to be better understood. In this context, the objective of the present study was to evaluate the chemical characteristics of agro-industrial residues used in the manufacture of an aerobic liquid biofertilizer. We analyzed the macronutrient, micronutrient, and trace metal contents of seven waste products used as raw materials to create a biofertilizer. In addition, a survey of secondary biofertilizer data from different residues was carried out that showed great heterogeneity in the chemical compositions of these residues, which has a direct impact on the agronomic efficiency of these biofertilizers. The characterization revealed that some materials may be contaminants of the soil, due to high levels of trace metals, especially cadmium. We conclude that the generation of detailed inventories, such as those of the nutrient and heavy metal contents of the raw materials and biofertilizers produced, is indispensable for the correct recommendation of biologically-based inputs in agriculture.

scholarly journals Extraction of Capsinoid and its Analogs From Pepper Waste of Different Genotypes

2019 ◽  
Vol 14 (7) ◽  
pp. 1934578X1986567
Author(s):  
Sibel Bayil Oğuzkan
Keyword(s):  
Liquid Chromatography ◽  
High Performance ◽  
Raw Materials ◽  
Value Added ◽  
Sweet Pepper ◽  
Bioactive Materials ◽  
Waste Products ◽  
Cultivated Plant ◽  
Solanaceae Family ◽  
Pepper Sample

Pepper, a member of the Capsicum genus of the Solanaceae family, is an annual, cultivated plant that grows in temperate climates. The main analogs of capsinoids, which are the secondary metabolites of peppers, are capsaicin and dihydrocapsaicin. During process, calyxes and peduncles are considered to be waste. Levels of capsinoids in these tissues in not well known. An optimized method was used to extract bioactive materials from the waste products from C. annum L. genotypes. Calyxes and peduncles were collected and dried in the shade. Extractions were in MeOH solutions and the extracts were analyzed using high-performance liquid chromatography (HPLC) to quantify the total amount of capsinoid, capsaicin, and dihydrocapsaicin contents. Capsinoid, and its analogs, were identified in all genotypes at varying concentrations, and their capsaicin and dihydrocapsaicin contents evidenced with liquid chromatography-mass spectrometry (LC-MS). In conclusion, the highest amount of capsinoids was found in chili Samandağ peppers, whereas the lowest amount of capsinoids was found in the red sweet pepper sample. All pepper genotypes, the capsaicin amount was higher comparison to dihydrocapsaicin. Capsanoids and anologues obtained from waste pepper can be used as raw materials in production of value added products.

scholarly journals Materials and Applications for Low-Cost Ceramic Membranes

Membranes ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 105 ◽  
Author(s):  
Amanmyrat Abdullayev ◽  
Maged Bekheet ◽  
Dorian Hanaor ◽  
Aleksander Gurlo
Keyword(s):  
Water Treatment ◽  
Raw Materials ◽  
Low Cost ◽  
Temperature Stability ◽  
Ceramic Membranes ◽  
Production Costs ◽  
High Temperature Stability ◽  
Waste Products ◽  
Recent Developments ◽  
Materials Used

In water treatment applications, the use of ceramic membranes is associated with numerous advantages relative to polymer-based filtration systems. High-temperature stability, fouling resistance, and low maintenance requirements contribute to lower lifecycle costs in such systems. However, the high production costs of most commercially available ceramic membranes, stemming from raw materials and processing, are uneconomical for such systems in most water treatment applications. For this reason, there is a growing demand for new ceramic membranes based on low-cost raw materials and processes. The use of unrefined mineral feedstocks, clays, cement, sands, and ash as the basis for the fabrication of ceramic membranes offers a promising pathway towards the obtainment of effective filtration systems that can be economically implemented in large volumes. The design of effective ceramic filtration membranes based on low-cost raw materials and energy-efficient processes requires a balance of pore structure, mass flow, and robustness, all of which are highly dependent on the composition of materials used, the inclusion of various pore-forming and binding additives, and the thermal treatments to which membranes are subjected. In this review, we present recent developments in materials and processes for the fabrication of low-cost membranes from unrefined raw materials, including clays, zeolites, apatite, waste products, including fly ash and rice husk ash, and cement. We examine multiple aspects of materials design and address the challenges relating to their further development.

scholarly journals The terms of trade for agricultural and food products, 1951-2000

2011 ◽  
Vol 29 (2) ◽  
pp. 213-243 ◽  
Author(s):  
Raúl Serrano ◽  
Vicente Pinilla
Keyword(s):  
Raw Materials ◽  
Great Majority ◽  
Food Product ◽  
Food Products ◽  
Terms Of Trade ◽  
Agricultural Products ◽  
Real Price ◽  
Secular Decline ◽  
Processed Products

AbstractThis study aims to answer whether empirical records confirm the existence of a secular decline in the terms of trade affecting primary producers (the Singer–Prebisch hypothesis). The paper analyses the evolution of the terms of trade for agricultural and food products in the second half of the 20thcentury. We obtain sixty new real price indices for internationally traded agricultural products. We conclude, from a long-term perspective, that the deterioration in the terms of trade for agricultural and food products was strong and clear in the second half of the last century. In general, less processed products suffered a very heavy fall in their real prices. However, there was no continuous and persistent deterioration in the terms of trade either as a whole or for the great majority of the agricultural and food product groups (with the exception of natural rubber, textile fibres and other raw materials). Rather, this deterioration occurred in stages.

scholarly journals Use of Plastic Aggregates in Concrete

2019 ◽  
Vol 9 (1) ◽  
pp. 4406-4412
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Fly Ash ◽  
Construction Industry ◽  
Negative Impact ◽  
Raw Materials ◽  
Waste Products ◽  
Waste Plastic ◽  
Coarse Aggregates ◽  
Materials Used

There is no doubt concrete is most useful thing in construction industry but it has a negative impact also, just like a coin has two faces. Raw materials used in manufacturing of concrete affects the environment in one or the another negative way. Like manufacturing of cement produce carbon dioxide whereas the production of aggregates adds dust to the environment. Production of coarse aggregates also impact the geology of the area from they were extracted. A step taken in this direction is the use of waste products along with or in replacement of cement. Many of these materials are already in use, like silica fume, fly ash etc. In this study, plastic coarse aggregates were used in place of natural coarse aggregates. Plastic aggregates were produced by little processing of waste plastic. Plastic is the biggest threat to the environment, and it is affecting the environment rapidly. Some recent studies show that it can be used construction industry due to some of its properties like inert behavior, resistance to degradation etc. Also use of waste plastic can help in reducing plastic waste Various experiments were performed to test the mechanical properties of the concrete with plastic coarse aggregates. Concrete was prepared using plastic coarse aggregates in varying proportions of 0, 2.5, 5, 7.5 and 10%

scholarly journals LOW-WASTE TECHNOLOGY OF GLYCIDOL PRODUCTION BY PEROXIDE METHOD

2018 ◽  
Vol 13 (3) ◽  
pp. 49-56
Author(s):  
S. V. Leont'eva ◽  
M. R. Flid ◽  
M. A. Trushechkina ◽  
M. V. Babotina ◽  
V. R. Flid ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Technological Process ◽  
Allyl Alcohol ◽  
Raw Materials ◽  
Production Capacity ◽  
Solid Catalyst ◽  
Direct Oxidation ◽  
Hazard Class ◽  
Titanium Silicate ◽  
Waste Products

A technological process of manufacturing glycidol designed for the production capacity of 10 thousand tons per year and consisting in the direct oxidation of allyl alcohol with an aqueous solution of hydrogen peroxide in the presence of nanostructured titanium silicate in methanol is proposed. Due to the exothermic process, the solvent is not only a homogenizer of the mixture of the initial reagents of the epoxy process - allyl alcohol and hydrogen peroxide ensuring their interaction on the surface of the solid catalyst: it also prevents overheating of the reaction mass. On the basis of the research trial of the process the optimal parameters of the process were determined: temperature 30-40 °C; pressure 0.25 MPa; the initial hydrogen peroxide : allyl alcohol ratio = 1:(3-4) mass., methanol concentration in the reaction mixture 12-13 mol/l. Hydrogen peroxide conversion is 98%, the yield of the glycidol - 94%, the selectivity is no less than 95%. The process includes three main stages: (1) raw materials preparation, (2) liquid-phase epoxidation of allyl alcohol, (3) distillation of the target product. The scheme involves recirculation of unreacted allyl alcohol and the solvent - methanol. The developed technological process provides the following indicators (per 1 t of commercial glycidol): consumption of allyl alcohol no more than 0.843 t; consumption of hydrogen peroxide no more than 0.50 t (calculated for 100% hydrogen peroxide); consumption of methanol is no more than 0.022 tons All the waste products correspond to the 3-rd or 4-th hazard class.

scholarly journals Application of repurposing in design education within the framework of sustainable design approach

2021 ◽  
Vol 8 (3) ◽  
pp. 60-66
Author(s):  
Aysem G. Basar ◽  
Pinar Cartier
Keyword(s):  
Design Education ◽  
Raw Materials ◽  
Sustainable Design ◽  
Design Principles ◽  
Academic Program ◽  
European Continent ◽  
Waste Products ◽  
Sustainability Concept ◽  
Education Process

The development of the sustainability concept began primarily in the European continent. Its integration into lifestyles and with it, the increase of social awareness, were formed with the contributions of various NGOs. In this context, we see the contribution of integrating sustainable design principles into the academic program. The factors that are important in sustainable design such as lower usage of raw materials, environmentally friendly materials, convenience in production and assembly, energy consumption, and ease of recycling are conveyed to the students through various courses in the academic program. A case study was carried out to analyze the transfer of sustainable design principles to the education process and its implications. This research was carried out in three stages: creating a theoretical framework, fieldwork, and practical work with students who attended the Sustainable Design course. According to the results students create new designs before recycling waste products within the scope of repurposing concept.   Keywords: Repurposing, sustainability, industrial design, education, application    

scholarly journals Influence of the Type of Aggregate from Industrial Waste on Corrosion Resistance of Modified Fine-Grained Concrete

Buildings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 352
Author(s):  
Ljajsjan Zajceva ◽  
Ekaterina Lucyk ◽  
Tat’jana Latypova ◽  
Valerij Latypov ◽  
Pavel Fedorov ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Industrial Waste ◽  
Raw Materials ◽  
Mineral Wool ◽  
Concrete Mixture ◽  
Green Technologies ◽  
Widespread Application ◽  
Waste Products ◽  
Natural Resource Conservation ◽  
Use Of Resources

The development and implementation of “green” technologies in the construction sector, which ensure natural resource conservation, reduce harmful emissions and provide utilization of industrial waste, are key issues in material engineering of the XXI century. Extensive research has been devoted to solving these issues, including research in the field of concrete science. Still, the issue of developing concrete compositions with increased corrosion resistance remains much less studied. At the same time, reactive aggregates from industrial waste can have positive effect on durability of concrete, and the best result can be achieved by means of modification of a concrete mixture with highly effective additives. The article presents the research data in two lines—the study of applicability of reactive aggregates from waste products of nonmetallic and ceramic industries, mineral wool production and concrete scrap for production of corrosion-resistant concretes, as well as the assessment of possibility of Portland cement quantity reduction in a concrete mixture on local raw materials due to the introduction of additives based on polycarboxylates. The article presents the research evidence of the effect of dust and clay particles content on the quality of concrete with a polycarboxylate additive. The article describes the studies of corrosion resistance of concrete samples based on production wastes in sulfate environments and under the influence of carbon dioxide. The developed concrete compositions with waste use can be recommended for widespread application, rational use of resources, and production of durable high-quality concretes. The application of additives based on polycarboxylates makes it possible to produce concretes with the reduction of cement consumption in the mixture by 10–20% and decrease in the mode of thermo-wet treatment by two times.

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