scholarly journals Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes

2021 ◽  
Vol 13 (8) ◽  
pp. 4501
Author(s):  
Nuno Cristelo ◽  
Jhonathan Rivera ◽  
Tiago Miranda ◽  
Ana Fernández-Jiménez
Keyword(s):  
Alkaline Solution ◽  
Cohesive Soil ◽  
Industrial Wastes ◽  
Glass Waste ◽  
Experimental Procedure ◽  
Extrusion Dies ◽  
Alternative Materials ◽  
Relevant Variables ◽  
Aluminium Extrusion ◽  
By Products

The development of alternative materials for the construction industry, based on different types of waste, is gaining significant importance in recent years. This is mostly due to the need to increase sustainability of this heavily polluting activity, thus mitigating the dependence on, for instance, Portland cement. The present paper is related to the development of an alkaline activated cement (AAC) exclusively fabricated from industrial by-products (both precursor and activator). Coal combustion fly ash, a common residue from thermoelectric powerplants, and glass waste, from the manufacture of ophthalmic lenses, were used as precursors. These precursors were activated with a recycled alkaline solution, resulting from the cleaning of aluminium extrusion dies, instead of the more common commercial reagents usually applied for this type of binder. Several pastes were studied, combining the precursor and alkaline solution in different proportions. When the most-performing cements were defined, they were used to stabilise a cohesive soil. The experimental procedure and subsequent analysis were designed based on a Response Surface Methodology model, considering the Activator/Solids and Soil/Precursor ratios as the most relevant variables of the stabilisation process. It was observed that, depending on the type of alkaline cement used, there was an optimum precursor and activator contents to optimise the mechanical properties of the stabilised soil. The reliability of this prediction was especially dependent on the type of precursors and, also, on their respective dissolution process right before the homogenization with the soil, under the working conditions available.

Preliminary results of the optimization of biogas production at the biogas station of the national research institute of animal production in Grodziec Sląski – Kostkowice

2015 ◽  
Vol 2 (3) ◽  
pp. 26-31
Author(s):  
K. Węglarzy ◽  
Yu. Shliva ◽  
B. Matros ◽  
G. Sych
Keyword(s):  
Agricultural Production ◽  
Crude Protein ◽  
Biogas Production ◽  
Electric Energy ◽  
Corn Silage ◽  
Industrial Wastes ◽  
Organic Mass ◽  
National Research Institute ◽  
Digestion Process ◽  
By Products

Aim. To optimize the methane digestion process while using different recipes of substrate components of ag- ricultural origin. Methods. The chemical composition of separate components of the substrate of agricultural by-products, industrial wastes, fats of the agrorefi nery and corn silage was studied. Dry (organic) mass, crude protein (fat) fi ber, loose ash, nitrogen-free exhaust were estimated in the components and the productivity of biogas was determined along with the methane content. These data were used as a basis for daily recipes of the substrate and the analysis of biogas production at the biogas station in Kostkowice. Results. The application of by-products of agricultural production solves the problem of their storage on boards and in open containers, which reduces investment costs, related to the installation of units for their storage. Conclusions. The return on investment for obtaining electric energy out of agricultural biogas depends considerably on the kind of the substrate used and on technological and market conditions.

Removal of Toxic Metal Ions from Solutions Using Industrial Solid Byproducts

1993 ◽  
Vol 27 (10) ◽  
pp. 83-93 ◽  
Author(s):  
A. I. Zouboulis ◽  
K. A. Kydros ◽  
K. A. Matis
Keyword(s):  
Toxic Metals ◽  
Toxic Metal ◽  
Industrial Wastes ◽  
Mineral Particles ◽  
Solid Adsorbent ◽  
Metals Removal ◽  
Environmental Considerations ◽  
Solid Liquid ◽  
Solid Liquid Separation ◽  
By Products

Nowadays the problem of industrial wastes handling and disposal is increasing continuously, as more strict environmental considerations have to be taken into account. In this paper, selected experimental results are presented from our current research in toxic metals removal (e.g. Cu, Pb, As), related to the applications of mineral particles as by-products (red mud, pyrite, dolomite, etc.) for the induced removal of toxic metals from aqueous solutions. These by-products, existing in finely divided form and considered rather as solid industrial wastes, have been used as a cheap solid adsorbent or substrate. Appropriate methods for the subsequent solid/liquid separation were examined, among them flotation. Different parameters were tested and high removals of toxic metals were achieved. In this way, a useful application may be realized for the waste mineral particles.

Table II : Quantitative determination of carbonyl compounds at different odour sources (concentrations in ppb) Rendering plant Gelatine plant neighbourhood neighbourhood Formaldehyde 40 16 Acetaldehyde 39 24 Acetone 36 73 Prcpanal 10 -Isobutyraldehyde 10 30 Pentanal 15 19 Hexanal 3.52 Heptanal 12.5 Octanal 10.5 Nonanal 1 2 acids (figure 7). However extractions always involve a serious decrease in sensitivity, while evaporation of the extract produces a solution in 0.1-0.5 ml of solvent, and only 1 pi of it can be brought in the gas chromatograph. Therefore work is in progress to enhance sensitivity by converting acids in­ to halogenated derivatives, which can be GC-analysed with the more sensitive electron-capture detector. For thiols a similar procedure is investigated as with aldehydes. One possibility is absorption of thiols in an alkaline solution and reaction with 2,4-dinitrochlorobenzene, yielding 2,4-dinitrofenylsulfides, which are analysed by HPLC (9). Sane improvements on removal of reagents at the one hand and on separation of sane by-products on the other hand have to be achieved in order to in­ crease the sensitivity with another factor of ten. 5. CONCLUSION The actual scope and limitations of chemical analysis of odour show that all problems can be tackled as far as emission is concerned. For iititiission measurements seme progress is necessary, but there is no essential reason why chemical analysis would be unable to attain the desired sensitivity for all types of odorants. There is no doubt that in a few years the last dif­ ficulties will be solved. In order to achieve real control of odour nui­ sance, automatic measurement is necessary on a long time basis. There again seme technical development is to be expected. Does this mean that machines are going to decide if an odour is pre­ sent or not? By no means, while the population will always be the reference, and psychophysical measurements will be necessary to make chemical analysis possible.

1986 ◽  
pp. 171-171
Keyword(s):  
Chemical Analysis ◽  
Quantitative Determination ◽  
Alkaline Solution ◽  
Automatic Measurement ◽  
The Other ◽  
Long Time ◽  
Time Basis ◽  
The One ◽  
By Products

scholarly journals Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3041 ◽  
Author(s):  
Jiyu Wang ◽  
Kai Zheng ◽  
Na Cui ◽  
Xin Cheng ◽  
Kai Ren ◽  
...  
Keyword(s):  
Solid Waste ◽  
Negative Impact ◽  
Lightweight Aggregate ◽  
Cementitious Materials ◽  
Environmental Benefits ◽  
Industrial Wastes ◽  
Lightweight Aggregate Concrete ◽  
Future Research ◽  
Aggregate Concrete ◽  
By Products

Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources. In this review article, the agricultural and industrial wastes and by-products, which were used as cementitious materials and artificial lightweight aggregate concrete, are summarized. Besides, the mechanical properties, durability, and a few advanced microstructure characterization methods were reviewed as well. This review also provides a look to the future research trends that may help address the challenges or further enhance the environmental benefits of lightweight aggregate concrete manufactured with solid waste and recycled by-products.

Generalized Bogue calculations for determining phase compatibility/equilibria: Assessing potential use of inorganic industrial by-products

1989 ◽  
Vol 4 (2) ◽  
pp. 447-451 ◽  
Author(s):  
J. Majling ◽  
V. Jesenák ◽  
Della M. Roy ◽  
Rustum Roy
Keyword(s):  
Phase Composition ◽  
Raw Materials ◽  
Equilibrium Phase ◽  
Material Balance ◽  
Industrial Wastes ◽  
Raw Material ◽  
Equilibrium Phase Composition ◽  
Phase Compatibility ◽  
By Products ◽  
Potential Use

A method has been developed for determining the equilibrium phase composition of multicomponent systems at subsolidus conditions and atmospheric pressure, based on the knowledge of binary phase compatibilities and on information concerning the existence and stoichiometry of ternary and higher order compounds. The method, combined with material balance, enables computation of the changes of equilibrium phase compositions of fired products dependent on the proportions of multicomponent raw materials; the procedure is useful for assessing the exploitability of industrial wastes for production of binding materials and ceramics. It is also possible to find the raw material mixture composition needed for the desired phase composition of the fired product.

Health hazards in the paleontology laboratory

1989 ◽  
Vol 4 ◽  
pp. 30-36
Author(s):  
Katherine M. Thomas
Keyword(s):  
Ionizing Radiation ◽  
Direct Contact ◽  
Medical Literature ◽  
Safety Information ◽  
Health Hazards ◽  
Industrial Wastes ◽  
Toxic Chemicals ◽  
The Common ◽  
The Individual ◽  
By Products

Recent medical literature has pointed out the health hazards associated with industrial wastes and by-products; however, little emphasis has been placed on the dangers inherent in scientific laboratories. These hazards range from direct contact with toxic chemicals and vapors to exposure to ionizing radiation. The damage may be acute or chronic; the effects temporary or residual. What follows is a summary of the common hazards, the basic management of laboratory trauma, and guidelines to prevent injury. The individual preceding chapters also contain safety information relative to the specific lab techniques discussed.

scholarly journals Valorization of Mushroom By-Products as a Source of Value-Added Compounds and Potential Applications

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2672 ◽  
Author(s):  
Filipa Antunes ◽  
Sara Marçal ◽  
Oludemi Taofiq ◽  
Alcina M. M. B. Morais ◽  
Ana Cristina Freitas ◽  
...  
Keyword(s):  
Bioactive Compounds ◽  
Food System ◽  
Animal Feed ◽  
Value Added ◽  
Pharmaceutical Formulations ◽  
Extraction Methods ◽  
Industrial Wastes ◽  
Added Value ◽  
Future Research ◽  
By Products

Nowadays, the food sector is highly concerned with environmental issues and foreseen to develop strategies to reduce waste and losses resulting from activities developed in the food system. An approach is to increment added value to the agro-industrial wastes, which might provide economic growth and environmental protection, contributing to a circular economy. Mushroom by-products represent a disposal problem, but they are also promising sources of important compounds, which may be used due to their functional and nutritional properties. Research has been developed in different fields to obtain value added solutions for the by-products generated during mushroom production and processing. Bioactive compounds have been obtained and applied in the development of nutraceutical and pharmaceutical formulations. Additionally, other applications have been explored and include animal feed, fertilizer, bioremediation, energy production, bio-based materials, cosmetics and cosmeceuticals. The main purpose of this review is to highlight the relevant composition of mushroom by-products and discuss their potential as a source of functional compounds and other applications. Future research needs to explore pilot and industrial scale extraction methods to understand the technological feasibility and the economic sustainability of the bioactive compounds extraction and valorization towards different applications.

scholarly journals Thermal characterization of hydrated eco-friendly clinkers produced from pulp and paper mill waste

Cerâmica ◽  
2018 ◽  
Vol 64 (371) ◽  
pp. 311-317 ◽  
Author(s):  
L. Simão ◽  
N. J. Lóh ◽  
D. Hotza ◽  
F. Raupp-Pereira ◽  
J. A. Labrincha ◽  
...  
Keyword(s):  
Thermal Characterization ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Industrial Wastes ◽  
Pulp And Paper Mill ◽  
Paper Mills ◽  
Bet Analysis ◽  
Alternative Materials ◽  
Clinker Production

Abstract Industrial wastes from pulp and paper mills are potentially useful materials to use as alternative materials in clinker production. In this study, eco-friendly clinkers were obtained using only waste as feedstock. Eco-friendly clinker with different C3S and C2S contents were produced and hydrated for 7 days at 40 °C, or for 28 and 90 days at room temperature. The potentialities of these waste and the products obtained were revealed through chemical (XRF), thermal (DTA/TG) and surface area (BET) analysis. For comparison, a common ordinary Portland cement (OPC) was tested. As expected, the hydration rate of formulations presenting higher C3S content was higher, generating higher amounts of Ca(OH)2. Furthermore, the amount of Portlandite formed was lower when compared to OPC.

Assessment of the Technological Properties of High Temperature Fired Clayey Ceramics Incorporated with Glass Waste

2015 ◽  
Vol 820 ◽  
pp. 449-454
Author(s):  
Alline Sardinha Cordeiro Morais ◽  
Thais Mardegan Louzada ◽  
Veronica Scarpini Candido ◽  
Sergio Neves Monteiro ◽  
Carlos Mauricio Fontes Vieira
Keyword(s):  
High Temperature ◽  
Water Absorption ◽  
Glass Powder ◽  
Linear Shrinkage ◽  
Substantial Improvement ◽  
Industrial Wastes ◽  
Technological Properties ◽  
Glass Waste ◽  
Fluorescent Lamps ◽  
Higher Temperature

The incorporation of industrial wastes into clayey ceramics used in civil construction is becoming a worldwide procedure not only to provide an environmentally correct destination for the waste but, in some cases, to improve the ceramic properties. The objective of the present work was to evaluate the effect of incorporation of a glass powder waste from decontamination process of fluorescent lamps into clayey ceramics. This evaluation was performed based on the technological properties of water absorption, linear shrinkage ad flexural strength. The properties evaluation was complemented by optical microscopy structural observation. The glass waste was incorporated in up to 30 wt% and specimens were uniaxially pressed at 20 MPa and fired at a relatively higher temperature of 1000°C. The results confirmed a substantial improvement of both the water absorption and the strength with glass waste incorporation into clayey ceramics.

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