scholarly journals Sludge Thermal Utilization, and the Circular Economy

2019 ◽  
Vol 29 (4) ◽  
pp. 157-175 ◽  
Author(s):  
Jurand D. Bień ◽  
Beata Bień

Abstract In 2015, the European Commission has adopted an ambitious Circular Economy Action Plan (CEAP), which includes measures that would help stimulate Europe’s transition towards a circular economy. In general four key action areas have been defined: production, consumption, waste management and secondary raw materials. Actions will lead to the resource-efficient and environmentally friendly outcomes. Biological materials should be returned to the natural metabolic cycles after necessary pre-treatment while waste that can not be prevented or recycled is to be used for the energy recovery. Sewage sludge is a large-tonnage waste produced at wastewater treatments plants (WWTPs). Its utilization causes some problems. High water content in sludge, hazardous substances as heavy metals, organic toxins and pathogens limit some potential methods of sludge utilization. Thermal treatment methods offer a solution, some hazardous substances can be destroyed or removed, energy can be recovered and some nutrients can be obtained from ash or other by-products.

2021 ◽  
pp. 34-40
Author(s):  
Guenter TIESS ◽  
Iryna SOKOLOVA ◽  
Serhii KLOCHKOV

The paper analyzes the changes in commodity market distortions, competing land use types, raw material demand for development, and rapid diffusion of key enabling technologies meeting the requirements of constant, dynamic development of major European industries. The author gives the relationship between the dynamics for mineral resources consumption growth, and changes in the conditions of production of these resources. Contains a critical review of methods for predicting the mineral resources dependency, including an estimated forecasting method based on guidelines for the evaluation of needs for natural resources and their substitutes.    One of the principles is comprehensive and integrated resource recovery. In a nutshell, this new approach argues that any operation should disturb a mine site only once and extract all useful materials using an optimised integrated flowsheet. This principle also requires that all by-products and residues are (re)used and that by-products and tailings at the end of life to be ‘future-proofed’, i.e. they should retain their ability to continue to be of value into the distant future where technology/economy may make feasible their use.    It is noted that access to and affordability of mineral raw materials are crucial for the sound functioning of the EU’s economy. A new 2020 list of critical mineral raw materials is presented and ways to compensate for the CRM deficit are described in detail.    Separately noted that the mineral policy is needed to be meticulously treated to facilitate company investment security, streamline permitting and access to minerals in a line with the European Green Deal, the Circular Economy Action Plan, the Bioeconomy Strategy and the European Industrial Strategy. Concerning, the latest steps towards Europe economically resilient by a framework for raw materials and the Circular Economy – creation of European Raw Materials Alliance recognized as particularly effective.    Global Industry Standard on Tailings Management represented as a robust, fit-for-purpose international standard for the safer management of tailings storage facilities.    The argument is given that since the land issue is one of the most delicate in a densely populated areas heavily dependent on agriculture, housing, infrastructure or other nonmineral development, a fair and equitable distribution of land is important for a mineral perspective.    There is also the need for strategic and open network between political, industrial and local communities through the exchange of information to enhance knowledge, experience and skills between stakeholders. Social acceptance of that idea is a fundamental element that must be addressed to develop a confl ict-free area for mineral development activities.    The conclusions indicate that we would like to emphasize that the main task of today is to create an effective system for monitoring the movement of raw materials along the entire added-value chain. The ability to quickly identify and respond to challenges in mineral policy will provide leadership in EU strategic technologies and industries. This process has already started with the creation of the European Raw Materials Alliance ERMA. State institutions, businesses, scientific institutions, and civil society in the close dialogue are able to ensure sustainable development and security of civilization as a whole. 


2020 ◽  
Vol 19 (4) ◽  
pp. 598-617 ◽  
Author(s):  
S.V. Ratner

Subject. The article considers the concept of circular economy, which has originated relatively recently in the academic literature, and is now increasingly recognized in many countries at the national level. In the European Union, the transition to circular economy is viewed as an opportunity to improve competitiveness of the European Union, protect businesses from resource shortages and fluctuating prices for raw materials and supplies, and a way to increase employment and innovation. Objectives. The aim of the study is to analyze the incentives developed by the European Commission for moving to circular economy, and to assess their effectiveness on the basis of statistical analysis. Methods. I employ general scientific methods of research. Results. The analysis of the EU Action Plan for the Circular Economy enabled to conclude that the results of the recent research in circular economy barriers, eco-innovation, technology and infrastructure were successfully integrated into the framework of this document. Understanding the root causes holding back the circular economy development and the balanced combination of economic and administrative incentives strengthened the Action Plan, and it contributed to the circular economy development in the EU. Conclusions. The measures to stimulate the development of the circular economy proposed in the European Action Plan can be viewed as a prototype for designing similar strategies in other countries, including Russia. Meanwhile, a more detailed analysis of barriers to the circular economy at the level of individual countries and regions is needed.


2021 ◽  
Vol 13 (4) ◽  
pp. 1899
Author(s):  
Fabiana Gatto ◽  
Ilaria Re

Reducing the environmental pressure along the products life cycle, increasing efficiency in the consumption of resources and use of renewable raw materials, and shifting the economic system toward a circular and a climate-neutral model represent the heart of the current macro-trends of the European Union (EU) policy agendas. The circular economy and bioeconomy concepts introduced in the EU’s Circular Economy Action Plan and the Bioeconomy Strategy support innovation in rethinking economic systems focusing on market uptaking of greener solutions based on less-intensive resource consumption. In recent decades, industrial research has devoted enormous investments to demonstrate sustainable circular bio-based business models capable of overcoming the “Valley of Death” through alternative strategic orientations of “technological-push” and “market-pull”. The study highlights industrial research’s evolution on bio-based circular business model validation, trends, and topics with particular attention to the empowering capacity of start-ups and small and medium-sized enterprises (SMEs) to close the loops in renewable biological use and reduce dependence on fossil fuels. The research methodology involves a bibliographic search based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) approach and the European Innovation Council (EIC) Accelerator Data Hub investigation to understand SMEs’ key success factors and start-ups of the circular bioeconomy sector. Eco and bio-based materials, nutraceuticals, and microalgae represent the most sustainable industry applications, leading to circular bioeconomy business models’ future perspective.


2021 ◽  
Vol 11 (1) ◽  
pp. 19-35
Author(s):  
Nicolae Pintilie ◽  

This paper aims to create an image of progress towards circular economy registered by European Union countries through specific indicators. In this way, this paper is based on the study and analysis of the 13 indicators, grouped on 4 pillars: Production and consumption, Waste management, Secondary raw materials, Competitiveness and innovation. After the presentation of the methodology, the paper develops an analysis in time and space of the selected indicators, then an analysis of the countries with their grouping on clusters, creating a map of them and highlighting the current situation of circular economy in the European Union. Moreover, the paper also presents the evolution of the countries regarding circular economy, which has a big importance taking into account that in the European Union the preoccupations for this concept is higher from one period to another. Among the most interesting results are: (1) a massive concentration of countries with problems for Waste management pillar; (2) Europe is one of the regions with the largest contribution in terms of circular economy, but the concept is developing differently from one country to another; (3) The scoreboard evolution is particularly useful in revealing the continuous actions adopted by countries in order to facilitate the conversion to circular economy. Finally, the paper presents possible limits of the research, but also future directions of its development.


1980 ◽  
Vol 3 ◽  
pp. 85-90 ◽  
Author(s):  
I. H. Pike ◽  
I. N. Tatterson

Most of the by-products from fish go into the production of fish meal and fish oil, the latter going directly to the human food chain, and therefore do not really come under the heading of industrial by-products and waste per se. Broadly speaking, fish meal made from fish offal is a by-product which otherwise would have been wasted. This paper discusses the quantities involved and the nutritional properties offish meal, and in addition, the contribution to fish meal and fish oil made from species which are not suitable for human consumption (e.g. sandeels) or where the quantities caught exceed the demand for human consumption (e.g. sprats).Any method of utilizing fish by-products for animal feeding should minimize chemical changes in the product to avoid reduction in the nutrients which are present at the time of catching. In some respects chemical changes in fish by-products are brought about in a similar way to those in grass, cut for preservation. The fish material has a high water content, around 75%, and from the time of catching is subject to chemical changes by enzymes in the fish and also by bacterial action. Fish, however, differs from grass in that it contains oil and virtually no carbohydrates. The demersal, or lean fish, for example, cod, haddock, plaice, saithe, etc., contain high levels of oil in the liver which are removed for separate processing, but little in the flesh and in the offal produced. The ‘industrial’ fish caught are mainly pelagic species with high levels of oil in the flesh.


2018 ◽  
Vol 20 (4) ◽  
pp. 706-711 ◽  

<p>WEEE is a fast-growing waste stream that includes potentially hazardous substances, but also valuable secondary raw materials, which can be recovered by adequate recycling and recovery treatment. In the last years, the research interest has moved from the conventional recycling (recovery of ferrous and non-ferrous metals, plastic, glass and other “mass relevant” fractions presented in WEEE), to the innovational recycling, aimed to recover trace elements, such as critical metals (CMs) and rare earth elements (REEs). Currently, the majority of CMs and REEs are lost during the pre-treatment processes. In this paper, an overview of the most relevant e-waste categories and products in terms of CMs and REEs presence, a description of currently applied pre-treatment methods and fate of the observed group of metals during pre-processing phase, as well as general recommendation in order to avoid losses of CMs and REEs within the WEEE treatment chain, are elaborated.</p>


2021 ◽  
Vol 10 (3) ◽  
pp. 138
Author(s):  
Gabriel Zola Scriptura ◽  
Endang Dewi Masithah

Fish is a protein source that is very potential and needed by humans. One of the fish that has a high enough nutrient content is Red Snapper (Lutjanus malabaricus). Snapper fish contains 92 kilocalories of energy, 20 grams of protein, 0 grams of carbohydrates, 0.7 grams of fat, 20 milligrams of calcium, 200 milligrams of phosphorus, and 1 milligram of iron. The high water content is one potential that must be considered because it is a good medium for microbial growth. Therefore efforts are needed to maintain the nutritional content, freshness, taste, and extend the shelf life through preservation, one of which is by freezing. The Air Blast Freezing method is one of the freezing methods that uses a combination of low temperatures which are temperatures of -35℃ to -40℃ by blowing cold air  quickly towards the product. This method has the advantage of one of which is relatively easy operation. The purpose of this field work practice is to know the process of freezing Red Snapper (Lutjanus malabaricus) with the Air Blast Freezing (ABF) method and the obstacles in the production of Red Snapper (Lutjanus malabaricus) using the Air Blast Freezing (ABF) method. The stages of the production process of Red Snapper (Lutjanus malabaricus) are the reception of raw materials, washing I, sorting, washing II, weighing, washing III, preparation, freezing with the Air Blast Freezing (ABF) method, glazing, packaging, storaging, stuffing. The freezing process with the Air Blast Freezing (ABF) method uses a temperature of -35℃ to -40℃ for 6-8 hours so that the plant can produce as much as 3 tons in one day. Obstacles to the freezing process at PT ILUFA are raw materials that contain parasites. Factors that influence the freezing process include raw materials during the reception and monitoring process during the freezing process in the ABF engine.


Author(s):  
Mariann Chaussy ◽  
Morgan Chabannes ◽  
Arnaud Day ◽  
David Bulteel ◽  
Frederic Becquart ◽  
...  

Human activities require a growing need for raw materials. In order to contribute to sustainable development, many business sectors are focusing on biomass valorization. Whether from dedicated crops or first industrial processing, it generates materials with high potential that can be used in many fields. Non-food uses mainly concern the energy, chemical, and construction sectors. Whatever the intended application, a pre-treatment stage is essential to clean the material and/or to access a specific fraction. An additional modification may occur in order to endow the material with a new function thanks to a process known as functionalization. Uses of plant fractions (aggregates) in combination with cement offer advantages like low-density materials with attractive thermophysical properties for building. However, their development is limited by the compatibility of crop by-products with hydraulic binders such as Ordinary Portland Cement (OPC). This includes delays in setting time and hydrophilic character of vegetal components and their interaction with an alkaline environment. The aggregate/cement interfaces can therefore be strongly affected. In addition, the diversity of crop by-products and mineral binders increases the level of complexity. In order to overcome these drawbacks, the treatment of plant fractions before their use with mineral binders may result in significant benefits. In this way, various treatments have been tested, but the methods used at an industrial scale remain relatively under-researched. The purpose of this review is therefore to highlight the mechanisms involved in each specific process, thus justifying the operating conditions specific to each. This bibliography study aims to highlight potential treatments that could apply to biomass before their mixing with cementitious binders. According to the objective, a distinction can be made between extraction processes as hydrothermal or solvent treatments, assisted or not, and structural modification processes as surface treatments, impregnation, or grafting.


2021 ◽  
pp. 0734242X2199190
Author(s):  
Spiros Karamoutsos ◽  
Theofani Tzevelekou ◽  
Angeliki Christogerou ◽  
Eleni Grilla ◽  
Antonios Gypakis ◽  
...  

The biggest challenge for our society, in order to foster the sustainable circular economy, is the efficient recycling of wastes from industrial, commercial, domestic and other streams. The transition to a circular economy is the goal of the European Commission’s Circular Economy Action, which was first launched in 2015. In 2020 the above action plan announced initiatives along the entire life cycle of the product, with the aim to make sustainable products the norm in the EU. Therefore, it is anticipated that the above action will result in an increase in Europe’s economic competitiveness, sustainability, resource efficiency and resource security. Within this context, the suitability of ferroalumina as a raw material in the blast furnace is investigated. Ferroalumina is the product of the high-pressure filter press dewatering process of the Greek red mud generated during the production of alumina by means of the Bayer cycle. Ferroalumina is a low-cost raw material and its possible charging in the blast furnace and/or steelmaking aggregates is a step towards industrial symbiosis, where the wastes, namely by-products, of an industry or an industrial process, become the raw materials for another. In the present work the effect of ferroalumina addition as a raw material was examined by smelting ferroalumina, blast furnace-slag, lime and scrap at 1550°C in a graphite crucible and a constant slag basicity. The increase of the alumina content in the slag improves the desulfurization capacity. Moreover, the silicon exchange between slag and metal was examined. The results indicate that the alkalis’ capacity of the slag increases with the addition of ferroalumina. The analysis of the finally obtained slag suggests that it could be suitable for utilization in slag-cement production.


2021 ◽  
Author(s):  
Biming Liu ◽  
Yue Teng ◽  
Wenbin Song ◽  
Haixia Wu

Abstract The Oily sludge with high water content (OS) was dewatered, modified and converted into solid fuel by a novel chemical conditioner (OSO-101). The effect of OSO-101 dosage on the dewaterability of OS was studied, showing that OSO-101 dosage of 15% (wt.) could achieve the best dewaterability efficiency of OS (98.18%). Meanwhile, compared with some conventional conditioners, OSO-101 developed by our team was more effective in improving OS dewaterability efficiency. And OSO-101 may have free radical reaction, polar reaction and redox reaction with petroleum hydrocarbons in OS, thereby polymerizing and forming condensed solid structures. The calorific value change of OS after conditioning, heavy metal content and dioxins content of fly ash leached from incinerated product were measured for resource analysis and environmental assessment. Results showed that the resultant OS fuel blocks had extremely low content of heavy metals, dioxins and other toxic and hazardous substances leached from fly ash, thereby no secondary treatment and fully meeting environmental protection emission standards. Additionally, OSO-101 had certain economic rationality, and could effectively recover the calorific value contained in OS. This research is expected to provide new insights for efficient dewaterability and modification of OS, as well as subsequent resource utilization and harmless treatment, bringing potential environmental and economic benefits.


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