scholarly journals Plastics waste management: A review of pyrolysis technology

2021 ◽  
Vol 1 (1) ◽  
pp. 50-69
Author(s):  
Wilson Uzochukwu Eze ◽  
◽  
Reginald Umunakwe ◽  
Henry Chinedu Obasi ◽  
Michael Ifeanyichukwu Ugbaja ◽  
...  

<abstract> <p>The world is today faced with the problem of plastic waste pollution more than ever before. Global plastic production continues to accelerate, despite the fact that recycling rates are comparatively low, with only about 15% of the 400 million tonnes of plastic currently produced annually being recycled. Although recycling rates have been steadily growing over the last 30 years, the rate of global plastic production far outweighs this, meaning that more and more plastic is ending up in dump sites, landfills and finally into the environment, where it damages the ecosystem. Better end-of-life options for plastic waste are needed to help support current recycling efforts and turn the tide on plastic waste. A promising emerging technology is plastic pyrolysis; a chemical process that breaks plastics down into their raw materials. Key products are liquid resembling crude oil, which can be burned as fuel and other feedstock which can be used for so many new chemical processes, enabling a closed-loop process. The experimental results on the pyrolysis of thermoplastic polymers are discussed in this review with emphasis on single and mixed waste plastics pyrolysis liquid fuel.</p> </abstract>

2021 ◽  
Vol 2 (2) ◽  
pp. 044-046
Author(s):  
Haydar Göksu

Recycling is the inclusion of wastes that can be recycled into the production process by transforming them into secondary raw materials after various physical and/or chemical processes. The natural resources are not infinite. Of course it will run out one day. For this reason, the recycling process has gained a serious dimension for countries due to both economic and environmental factors. Although the recycling process of thermoplastic materials is known and frequently used by the science and industry community, the recycling of rubber materials has remained in the background. However, with the increase in the number of automobiles around the world, the increasing amount of solid waste tires puts the society in trouble both economically and environmentally. In this research, there are data on the introduction of automobile tires, which are a very serious waste throughout the country, to the economy.


2019 ◽  
Vol 3 (1) ◽  
pp. 61-65
Author(s):  
Neneng Fitrya ◽  
Sri Fitria Retnawaty ◽  
Noni Febriani ◽  
Yulia Fitri ◽  
Shabri Putra Wirman ◽  
...  

          Community service aims to provide training to the entire academic community of IT Fadillah High School, Pekanbaru, about the use of plastic waste into useful and feasible items. This aims to minimize the risk of plastic waste because plastic has properties that are non-biodegradable and take a long time to be decomposed naturally on the ground. The items to be made are handicrafts in the form of plastic trash cans (ToSAPlas). The implementation of the activity uses lecture, demonstration and discussion methods. The lecture was filled with training materials on making ToSAPlas covering preparation of raw materials for supporting tools and materials, plastic cleaning, plastic cutting, weaving, finishing. The demonstration method was carried out by the service team by dividing the participants into 6 groups. Each group was accompanied by one member of the service team and practiced directly how the process of making ToSAPlas. The target of this service program is to increase lecturers' awareness of the environment and society, while for the partners this activity is a forum for discussion in developing creative ideas in the field of recycling plastic waste and making business products that can be offered in the market.  Keywords: Waste, Plastics, ToSAPlas


Author(s):  
N. I. Chernova ◽  
S. V. Kiseleva ◽  
O. M. Larina ◽  
G. A. Sytchev

Algae biomass is considered as an alternative raw material for the production of biofuels. The search for new types of raw materials, including high-energy types of microalgae, remains relevant, since the share of motor fuels in the structure of the global fuel and energy balance remains consistently high (about 35%), and the price of oil is characterized by high volatility. The authors have considered the advantages of microalgae as sources of raw materials for fuel production. Biochemical and thermochemical conversion are proposed as technologies for their processing. This paper presents the results of the study of the pyrolysis of the biomass of clonal culture of blue-green microalgae / cyanobacteriumArthrospira platensis rsemsu 1/02-Pfrom the collection of the Research Laboratory of Renewable Energy Sources of the Lomonosov Moscow State University. An experiment to study the process of pyrolysis of microalgae biomass was carried out at the experimental facility of the Institute of High Temperatures RAS in pure nitrogen grade 6.0 to create an oxygen-free environment with a linear heating rate of 10 ºС / min from room temperature to 1000 ºС. The whole process of pyrolysis proceeded in the field of endothermy. The specific amounts of solid residue, pyrolysis liquid and gaseous products were experimentally determined. As a result of the pyrolysis of microalgae biomass weighing 15 g, the following products were obtained: 1) coal has the mass of the solid residue is 2.68 g, or 17.7% of the initial mass of the microalgae (while 9.3% of the initial mass of the microalgae remained in the reactor); 2) pyrolysis liquid – weight 3.3 g, or 21.9% of the initial weight; 3) non-condensable pyrolysis gases – weight 1.15 l. The specific volumetric gas yield (the amount of gas released from 1 kg of the starting material) was 0.076 Nm3/ kg. The analysis of the composition and specific volume yield of non-condensable pyrolysis gases formed in the process of pyrolysis, depending on temperature. It is shown that with increasing temperature, the proportion of highcalorie components of the gas mixture (hydrogen, methane and carbon monoxide) increases. The calorific value of the mixture of these gases has been estimated.


Author(s):  
Lina Yurievna Lagutkina

The author of the article discloses the prospects of development of the world feed production for aquaculture based on the analysis of key innovative technological and market trends. The author specifies that shortage, high cost, low ecological compatibility of traditional raw materials - fish flour - are among major limiting factors in the development of production of feeds for aquaculture. This fact, in turn, limits sustainable development of aquaculture both in Russia, and in the world in general. The article presents the overview of a current status of the world industry of feed production in aquaculture, where the regional situation is studied, as well. For the first time, there is given the outlook of innovative technologies in feed production based on the alternative sources of protein (on the example of projects of leading aquabiotechnological companies) which will determine industry’s objectives for the mid-term perspective.


Author(s):  
В.Н. СУРОВЦЕВ ◽  
Е.Н. ПАЮРОВА

Проанализированы проблемы на рынке молока и молочных продуктов России в условиях глобального экономического кризиса: перепроизводство молока в основных странах-экспортерах, снижение закупочных цен на сырое молоко, снижение цен на биржевые товары в мире и России в 2020 году, тренд на уменьшение спроса на молочные продукты на мировом рынке в среднесрочном периоде, снижение общего спроса на молочные продукты на внутрироссийском рынке при падении реальных доходов населения, изменение структуры потребления. Проведена оценка новых возможностей и угроз для развития отрасли: со стороны потребителей — рост цен на продовольствие, снижение доходов; с позиции производителей молока — снижение закупочных цен, рост требований к сырью для производства продукции с увеличенными сроками годности, дефицит рабочей силы, вероятное сокращение господдержки в результате снижения цен на углеводороды, попытки регулирования цен; со стороны перерабатывающих предприятий — сокращение спроса, снижение цен на готовую продукцию вслед за мировыми ценами. Обоснованы приоритеты инвестирования в молочном скотоводстве и основные формы совершенствования государственной поддержки отрасли, обеспечивающие эффективную адаптацию производителей молока к новым экономическим условиям, повышение устойчивости отрасли при усилении макроэкономических рисков. The article analyzes the problems in the Russian milk and dairy products market in the context of the global economic crisis: overproduction of milk in the main exporting countries, lower purchase prices for raw milk, lower prices for commodities in the world and in Russia in 2020, trend to reduce demand for dairy products on the world market in medium term, a decrease in total demand for dairy products in the Russian market with a decrease in the purchasing power of the population, a change in the structure of consumption. An assessment of new opportunities and threats to the development of the industry was carried out: on the part of consumers — rising food prices, lower incomes; from the perspective of dairy producers — reduction in purchase prices, increased requirements for raw materials for the production of products with extended periods, labor shortages, the likely reduction in state support as a result of lower prices for hydrocarbons, attempts to regulate prices; on the part of processing enterprises — reduction of demand, reduction of prices for finished goods following world prices. The investment priorities in dairy cattle breeding and the main forms of improving state support for the industry, ensuring the effective adaptation of milk producers to new economic conditions, increasing the sustainability of the industry with increasing macroeconomic risks, are substantiated.


Author(s):  
Héctor Botero ◽  
Hernán Álvarez

This paper proposes a new composite observer capable of estimating the states and unknown (or changing) parameters of a chemical process, using some input-output measurements, the phenomenological based model and other available knowledge about the process. The proposed composite observer contains a classic observer (CO) to estimate the state variables, an observer-based estimator (OBE) to obtain the actual values of the unknown or changing parameters needed to tune the CO, and an asymptotic observer (AO) to estimate the states needed as input to the OBE. The proposed structure was applied to a CSTR model with three state variables. With the proposed structure, the concentration of reactants and other CSTR parameters can be estimated on-line if the reactor and jacket temperatures are known. The procedure for the design of the proposed structure is simple and guarantees observer convergence. In addition, the convergence speed of state and parameter estimation can be adjusted independently.


Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1097
Author(s):  
Francisco J. Hernández Fernández ◽  
Antonia Pérez de los Ríos

Sustainable chemical process engineering results from applying the principles of green chemistry or sustainable chemistry to chemical process engineering [...]


Author(s):  
Rebeca Jiménez-Rodríguez ◽  
Amalia Morales-Zumaquero

AbstractThis paper analyses the commodity price pass-through along the pricing chain for the global commodity price index and the indices of its main categories (i.e., agricultural raw materials, food and beverages, energy and metals) in the world, advanced and emerging economies. To do so, the study considers country-by-country vector autoregression models and pool the results by taking weighted means for 18 advanced economies and 19 emerging countries, as well as for the world (defined as the sum of advanced and emerging economies). The results show the following: (i) there is evidence in favour of partial pass-through from commodity prices to producer prices, although the evidence for the pass-through to consumer prices is less evident; (ii) the pass-through in the world seems to be led by both advanced and emerging countries for producer prices and only by advanced economies for consumer prices; (iii) higher prices in the four categories (agricultural raw materials only in the short-run) induce significant higher producer prices in almost all cases, with shocks in the prices of energy and metals showing the largest effects; and (iv) energy prices explain the highest variability of producer and consumer prices.


Author(s):  
A.E. Matveev ◽  
P. Yu. Nikitin ◽  
I.A. Zhukov ◽  
A.S. Zhukov
Keyword(s):  

2015 ◽  
Vol 738-739 ◽  
pp. 1303-1308
Author(s):  
Jing Hua Han ◽  
Ming Jia Li

Plant is not only closely related to human beings’ life, but also an integral part of raw materials in production. Protection of nature and plant resources is an increasingly urgent needs around the world. Cognition is a prerequisite for the protection of plant. But the way of plant science popularization is old, the knowledge of plant is too obscure to the general public. The system of plant science popularization based on the QR code spreads the knowledge of plant with illustrations interactively, to facilitate ordinary users to learn, understand and identify plant species. The article will detail all aspects of development of the system, allowing more scholars to understand the digitized plant science popularization under the new media.


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