scholarly journals Performance of Catalysts of Different Nature in Model Tar Component Decomposition

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 894 ◽  
Author(s):  
Pavol Steltenpohl ◽  
Jakub Husár ◽  
Patrik Šuhaj ◽  
Juma Haydary
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Clay Minerals ◽  
Chemical Properties ◽  
Catalytic Decomposition ◽  
Waste Utilization ◽  
Waste Material ◽  
Raw Material ◽  
Experimental Conditions ◽  
Decomposition Products

Municipal solid waste constitutes one of the major challenges and concerns of our society. Disposal of waste material is potentially dangerous, harming both environment and mankind. In order to diminish negative effects of municipal solid waste, its thermal decomposition to valuable chemicals has been studied. The principal draw-back of thermal processes used for solid waste utilization as raw material is tar formation. In this study, low-cost catalysts of different origin were tested in the decomposition of a model component of tar originating from waste material pyrolysis/gasification. p-Xylene was selected as the model compound found in biomass decomposition products. Its decomposition was carried out in the presence of either tire pyrolysis char- or clay minerals-based catalysts. Tar-cracking activities of both catalyst types at varying experimental conditions were compared and related to the catalysts physical-chemical properties. In experiments, either empty reactor or reactor filled with 10 g of the catalyst was used; p-xylene mass flow was set to 2.58 g h−1 (50 μL min−1, room temperature), and decomposition temperature ranging from 750 °C to 850 °C was applied. Moreover, evolution of the output variables, p-xylene conversion and hydrogen content in the gas phase, with the reaction time was investigated. Catalysts’ properties were assessed based on nitrogen adsorption isotherms, thermogravimetric and elemental composition analyses. Amounts and composition of p-xylene catalytic decomposition products were evaluated using GC analysis of both gaseous phase and condensable products. Results showed the superiority of tire pyrolysis char catalyst over that based on clay minerals.

scholarly journals A Review on Cementitious Materials Including Municipal Solid Waste Incineration Bottom Ash (MSWI-BA) as Aggregates

Buildings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 179
Author(s):  
Jad Bawab ◽  
Jamal Khatib ◽  
Said Kenai ◽  
Mohammed Sonebi
Keyword(s):  
Municipal Solid Waste ◽  
Water Absorption ◽  
Solid Waste ◽  
Bottom Ash ◽  
Chemical Properties ◽  
Waste Incineration ◽  
Treatment Method ◽  
Cementitious Materials ◽  
Municipal Solid Waste Incineration ◽  
Municipal Solid Wastes

Waste management is a vital environmental issue in the world today. Municipal solid wastes (MSWs) are discarded in huge quantities on a daily basis and need to be well controlled. Incineration is a common method for reducing the volume of these wastes, yet it produces ashes that require further assessment. Municipal solid waste incineration bottom ash (MSWI-BA) is the bulk byproduct of the incineration process and has the potential to be used in the construction sector. This paper offers a review of the use of MSWI-BA as aggregates in cementitious materials. With the growing demand of aggregates in cementitious materials, MSWI-BA is considered for use as a partial or full alternative. Although the physical and chemical properties of MSWI-BA are different than those of natural aggregates (NA) in terms of water absorption, density, and fineness, they can be treated by various methods to ensure suitable quality for construction purposes. These treatment methods are classified into thermal treatment, solidification and stabilization, and separation processes, where this review focuses on the techniques that reduce deficiencies limiting the use of MSWI-BA as aggregates in different ways. When replacing NA in cementitious materials, MSWI-BA causes a decrease in workability, density, and strength. Moreover, they cause an increase in water absorption, air porosity, and drying shrinkage. In general, the practicality of using MSWI-BA in cementitious materials is mainly influenced by its treatment method and the replacement level, and it is concluded that further research, especially on durability, is required before MSWI-BA can be efficiently used in the production of sustainable cementitious materials.

scholarly journals ENGINEERING GEOLOGICAL TYPIFICATION OF TERRITORIES FOR ALLOCATION OF MUNICIPAL SOLID WASTE MANAGEMENT FACILITIES

2020 ◽  
Vol 17 (35) ◽  
pp. 1124-1136
Author(s):  
Irina KOZLIAKOVA ◽  
Irina KOZHEVNIKOVA ◽  
Olga EREMINA ◽  
Nadezhda ANISIMOVA
Keyword(s):  
Waste Management ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Disposal ◽  
Solid Waste Management ◽  
Federal District ◽  
Waste Utilization ◽  
Municipal Solid Waste Management ◽  
Solid Waste Disposal ◽  
Municipal Solid Wastes

The management of municipal solid waste (MSW) appears to be one of the major ecological problems at present. Selecting sites for the disposal of municipal solid wastes or waste utilization facilities is one of the most contentious aspects of waste management. The present study aimed to develop the methodology to assess the natural protection of the geological environment from contamination upon the implementation of large ecological projects due to the allocation of MSW utilization facilities. The case of the Central Federal District of Russia (CFD) is taken as an example. The suitability of territories for municipal solid waste disposal is assessed according to the presence of weakly permeable deposits in the geological cross-section and their occurrence mode. A “map of engineering geological zoning CFD by the conditions of allocation MSW disposal sites and utilization facilities” has been compiled to a scale 1:2500000. The map gives a general indication of the suitability of the planned sites for waste disposal within the regarded region and showed that, for the bulk of territory, the allocation of MSW disposal and management facilities requires undertaking additional measures for the geoenvironmental protection from contamination.

Potential of municipal solid waste paper as raw material for production of cellulose nanofibres

2018 ◽  
Vol 80 ◽  
pp. 319-326 ◽  
Author(s):  
Maiju Hietala ◽  
Kalle Varrio ◽  
Linn Berglund ◽  
Jaakko Soini ◽  
Kristiina Oksman
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Raw Material ◽  
Waste Paper ◽  
Cellulose Nanofibres

scholarly journals Transition to a circular economy model as an alternative option of solving the problem of solid waste utilization

2020 ◽  
Vol 161 ◽  
pp. 01108
Author(s):  
Lyubov Larchenko ◽  
Lana Kuramshina
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Russian Federation ◽  
Circular Economy ◽  
Waste Utilization ◽  
Waste Collection ◽  
Economy Model ◽  
Ecological Problems ◽  
The Russian Federation ◽  
Theoretical Side

Socio-ecological problems are relevant, both at the global and at the national and regional levels. In 2020, much attention is paid to ecology. Due to environmental problems, it is planned to switch from a standard economic linear model to a circular economy. The authors considered the theoretical side of the circular economy, as well as the principles of such a model. The article discusses the existing scheme for the disposal of municipal solid waste, and also shows a new scheme for the disposal of municipal solid waste in the Arkhangelsk region as part of the EcoTechnoPark Shiyes project. The article discusses both the positive and negative aspects of this project. The authors conducted a sociological survey among the population of the Russian Federation, where it was proposed to evaluate the attitude to the EcoTechnoPark Shiyes project and the possibility of organizing separate waste collection. At the end of the article, possible solutions to the problem of recycling solid waste are suggested, options for adaptation and motivation of the population to solve this problem are considered.

scholarly journals Influence of the pH control strategy and reactor volume on batch fermentative hydrogen production from the organic fraction of municipal solid waste

2019 ◽  
Vol 37 (5) ◽  
pp. 478-485 ◽  
Author(s):  
Francesco Baldi ◽  
Renato Iannelli ◽  
Isabella Pecorini ◽  
Alessandra Polettini ◽  
Raffaella Pomi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Control Strategy ◽  
Ph Control ◽  
Organic Fraction ◽  
Experimental Conditions ◽  
Reactor Volume ◽  
Fermentative Hydrogen Production ◽  
Fermentative Hydrogen

Three different experimental sets of runs involving batch fermentation assays were performed to evaluate the influence of the experimental conditions on biological hydrogen production from the source-separated organic fraction of municipal solid waste collected through a door-to-door system. The fermentation process was operated with and without automatic pH control, at a pH of 5.5 and 6.5, food-to-microorganism ratios of 1/3 and 1/1 (wet weight basis) and with different working volumes (0.5 and 3 L). The experimental results showed that the pH control strategy and the reactor volume did not affect the final hydrogen production yield but played an important role in determining the time evolution of the process. Indeed, although the different experimental conditions tested yielded comparable hydrogen productions (with maximum average values ranging from 68.5 to 88.5 NLH2 (kgTVSOF)−1), the automatic pH control strategy improved the process from the kinetic viewpoint resulting in a t95 reduction from an average of 34.9 h without automatic pH control to an average of 19.5 h.

Development of a decision model for the techno-economic assessment of municipal solid waste utilization pathways

2016 ◽  
Vol 48 ◽  
pp. 548-564 ◽  
Author(s):  
Md. Mohib-Ul-Haque Khan ◽  
Siddharth Jain ◽  
Mahdi Vaezi ◽  
Amit Kumar
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Decision Model ◽  
Economic Assessment ◽  
Waste Utilization

Quantitative Study of Municipal Solid Waste Management in Algeria: A Perspective

2020 ◽  
Vol 46 (3) ◽  
pp. 293-298
Author(s):  
Bendjelloul Amina ◽  
Bennekrouf Mohamed ◽  
Kouloughli Sihem
Keyword(s):  
Developing Countries ◽  
Quantitative Analysis ◽  
Waste Management ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Solid Waste Management ◽  
Raw Material ◽  
Municipal Solid Waste Management ◽  
High Quality ◽  
Recycling Industry

MSWM (Municipal Solid Waste Management) is a challenge in developing countries, especially in Algeria. In this paper, a quantitative analysis is proposed, showing that the collection of recyclable items qualified as a high-quality raw material will build a wide profit. The locations of recycling centers in Algeria were determined for the plastic, paper/cardboard, metal, textile and glass. The annual generated amount of each type of recyclable was defined and finally a range of purchase prices was established to estimate the possible price to sell these products. The purpose was to find the most profitable recyclable material to be collected in order to motivate both the informal sector and the recycling industry to collect recyclables. It was observed that plastic is the most profitable recyclable followed by the paper/cardboard, and then textile.

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