scholarly journals Manufacturing of Bricks From Coal Mine Overburden Dump of Korba, Chhattisgarh, India

2020 ◽  
Author(s):  
Shailendra Kumar Singh ◽  
Ranjeet K Singh
Keyword(s):  
Mechanical Properties ◽  
Sodium Silicate ◽  
Coal Mine ◽  
Value Added ◽  
Loss On Ignition ◽  
Process Technology ◽  
Clay Bricks ◽  
Standardized Parameters ◽  
Value Added Products

Abstract Mixing coal mine overburden with sodium silicate and cement, for manufacturing bricks was studied with the objective of converting the coal mine overburden waste into value-added products. Bricks were prepared using different compositions of coal mine overburden with proportions of sodium silicate and Ordinary Portland Cement (OPC), in cuboid mould (9″ X 5″X 3″). Bricks were air dried for 24 hours, placed in oven for 115 ± 10 °C for 24 hours. Characterization of tailings and manufactured bricks were done. Mechanical properties such as compressive strength (CS), water absorption (WA), loss on ignition (LoI) and efflorescence were measured. The maximum CS of 9.5 N/mm2 was recorded for brick having overburden to cement ratio of 8:2. However, for making it more economical the ratio of 9:1 was considered and this compares very well cost with full filed the Indian standard (IS): 3495 (Part 1) (1992) of bricks. The results also indicated that the overburden percentage in the bricks affect their mechanical properties. The WA rates of the manufactured bricks are low compared to standard conventional clay bricks, and the same varies with process parameters. The low capillary pore may deter the formation of efflorescence. The process, with standardized parameters, may be commercially adapted, and large quantities of coal mine overburden may be put to use in making bricks. Thus, the process technology observed in this paper can potentially convert the huge amount of environmentally hazardous waste into value added product. Coal mine overburden may materialize as a sustainable supplement to conventional clay, use of which in brick making is totally restricted. The finding also usher a new area of research.

scholarly journals Chemical characterization of the pulp, peel and seeds of cocona (Solanum sessiliflorum Dunal)

2015 ◽  
Vol 18 (3) ◽  
pp. 192-198 ◽  
Author(s):  
Liliana SERNA-COCK ◽  
Diana Patricia VARGAS-MUÑOZ ◽  
Carlos Andrés RENGIFO-GUERRERO
Keyword(s):  
Dietary Fibre ◽  
Dry Matter ◽  
Functional Foods ◽  
Food Additives ◽  
Chemical Characterization ◽  
Value Added ◽  
Mineral Contents ◽  
Fruit Processing ◽  
Value Added Products

Summary The chemical characterization of the pulp, peel and seeds of cocona (Solanum sessiliflorum Dunal) was determined. In artisanal fruit processing, 26.3% of peel and 9.7% of seeds were obtained. The seeds showed a high potential for the development of value-added products because of their dry matter contents (23.46%) as follows: carbohydrate (69.37% dry basis (d.b.)), nitrogen (3.18 g/100 g of seed d.b.), K (0.023 g/100 g of seed d.b.), Fe (0.0185 g/100 g of seed d.b.) and dietary fiber (21.27 g/100 g of seed d.b.). The carbohydrate, dietary fibre and mineral contents of the pulp, peel and seeds also highlighted the agroindustrial potential of the fruit in that these constituents could be used to develop functional foods, food additives, preparations for functional diets and dietary supplements.

scholarly journals Recycling Construction and Demolition Residues in Clay Bricks

2021 ◽  
Vol 11 (19) ◽  
pp. 8918
Author(s):  
Chiara Zanelli ◽  
Elena Marrocchino ◽  
Guia Guarini ◽  
Alice Toffano ◽  
Carmela Vaccaro ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Environmental Impact ◽  
Construction Industry ◽  
Mineralogical Composition ◽  
Processing Plant ◽  
Fine Grained ◽  
Technical Performance ◽  
Clay Bricks ◽  
Compositional Properties

In recent years, the management of construction and demolition residues (CDRs) has become a major challenge for the construction industry due to the increasing volume of waste produced and its associated environmental impact. The aim of this article is to assess the effect of fine-grained fractions (<0.125 mm–0.6–0.125 mm) of construction and demolition residues, obtained by industrial sorting in a CDR processing plant in Rovigo (Italy), on the technological behavior and technical performance of clay bricks. Simulating the brickmaking process on a laboratory scale, it was appraised whether the CDR additions determined any change in the main properties of both fired and unfired bricks, taking a CDR-free brick body as a reference. The results indicated that the use of CDR is technologically feasible. It is possible to obtain, through proper crushing and sorting operations, grain-sized fractions with quite homogenous chemical and mineralogical composition. The residues did affect the compositional properties, porosity and water absorption of the clay bricks. Nevertheless, the characterization of the residual-added semi-finished and fired products highlighted their good technological and mechanical properties, which allowed them to provide performances similar to those of standard bricks manufactured with raw natural materials.

Microwave pyrolysis of polymeric materials: Waste tires treatment and characterization of the value-added products

2013 ◽  
Vol 103 ◽  
pp. 149-158 ◽  
Author(s):  
Andrea Undri ◽  
Stefano Meini ◽  
Luca Rosi ◽  
Marco Frediani ◽  
Piero Frediani
Keyword(s):  
Value Added ◽  
Polymeric Materials ◽  
Microwave Pyrolysis ◽  
Waste Tires ◽  
Value Added Products

Formation and characterization of BC and BC-paper pulp films for packaging application

2017 ◽  
Vol 31 (4) ◽  
pp. 500-513 ◽  
Author(s):  
Pasawadee Pradipasena ◽  
Rungsima Chollakup ◽  
Sumate Tantratian
Keyword(s):  
Mechanical Properties ◽  
Sodium Hydroxide ◽  
Acid Treatment ◽  
Value Added ◽  
Short Fiber ◽  
Oxygen Permeation ◽  
Food Sources ◽  
Paper Pulp ◽  
Sulfuric Acid Treatment

It was found beneficial to manufacture bacterial cellulose (BC) obtained from waste food sources to create value-added packaging products by firstly performing purification and disintegration processing of the BC and then reinforcing it with paper pulp. The purification treatment involved using sodium hydroxide (2% w/v at 100°C for 1 h) on BC pulp to remove the bacterial protein and the resulting cultured medium film was characterized with respect to its physical properties. An acid treatment on the purified BC pulp was applied to disintegrate cellulose network before forming a film. The results showed that the sodium hydroxide treatment increased the film burst index and brightness. Heating the BC pulp to 70–100°C in 1.25–5.00% v/v sulfuric acid treatment for 30 min degraded the film’s mechanical properties. Also, a study of the addition and mixing of paper pulps or modified cationic starch to the BC was found to improve the film properties with respect to packaging properties. Inclusion of short fiber paper pulp by 30 wt.% created a good synergistic effect by improving the mechanical properties of film especially for tear strength. Moreover, cationic-modified cassava starch (2% w/w) improved the tensile and burst index as well as resistance to oxygen permeation of the BC film. The results indicate that the BC pulp could be used to improve mechanical properties and resistance to water vapor and oxygen permeation of the short fiber paper pulp film which is ideal for packaging materials.

scholarly journals Valorization of granite micronized stones wastes for eco-friendly production of fired clay bricks

2021 ◽  
Vol 3 (11) ◽  
Author(s):  
Blasius Ngayakamo ◽  
Gbetoglo Charles Komadja ◽  
Abdulhakeem Bello ◽  
Azikiwe Peter Onwualu
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Research Work ◽  
Fine Powder ◽  
Value Added ◽  
Engineering Properties ◽  
Chemical Compositions ◽  
Clay Bricks ◽  
Granite Powder

AbstractConstruction and mining industries around the globe have been criticized for production of enormous solid wastes that have potential environmental impacts. Therefore, this study presents a feasible approach to recover and utilize granite micronized stones waste for production of eco-friendly bricks. This research work, aimed at substituting a natural clay with granite powder to produce value-added bricks with pronounced physical–mechanical properties. The micronized granite waste stones were crushed and ground to obtain a fine powder sample. Thereafter, different batch compositions containing a varied proportions of granite powder were prepared and fired at different sintering temperatures: 900, 1000 and 1100 °C. The raw materials and bricks were characterized for their chemical compositions, microstructural, mineralogical and physical–mechanical properties. The results showed that, an increase in granite waste powder and sintering temperature enhanced the quality of fired clay bricks in terms of mechanical strength and decreased simultaneously the apparent porosity and water absorption. The final experimental approach showed that, the possibility to produce eco-friendly bricks containing up to 30 wt% of granite powder with enhanced engineering properties fired at 1100 °C is promising. Graphic abstract

scholarly journals Structure, Application, and Biochemistry of Microbial Keratinases

2021 ◽  
Vol 12 ◽  
Author(s):  
Qingxin Li
Keyword(s):  
Amino Acids ◽  
Disulfide Bonds ◽  
Biochemical Characterization ◽  
Value Added ◽  
Structural Studies ◽  
Biotechnological Application ◽  
Hard Tissues ◽  
Made In ◽  
Value Added Products

Keratinases belong to a class of proteases that are able to degrade keratins into amino acids. Microbial keratinases play important roles in turning keratin-containing wastes into value-added products by participating in the degradation of keratin. Keratin is found in human and animal hard tissues, and its complicated structures make it resistant to degradation by common proteases. Although breaking disulfide bonds are involved in keratin degradation, keratinase is responsible for the cleavage of peptides, making it attractive in pharmaceutical and feather industries. Keratinase can serve as an important tool to convert keratin-rich wastes such as feathers from poultry industry into diverse products applicable to many fields. Despite of some progress made in isolating keratinase-producing microorganisms, structural studies of keratinases, and biochemical characterization of these enzymes, effort is still required to expand the biotechnological application of keratinase in diverse fields by identifying more keratinases, understanding the mechanism of action and constructing more active enzymes through molecular biology and protein engineering. Herein, this review covers structures, applications, biochemistry of microbial keratinases, and strategies to improve its efficiency in keratin degradation.

scholarly journals Status and Challenges of Solid Waste Management in Beung Kiat Ngong Ramsar Site, Pathoumphone District, Champasack Province, Laos PDR

2021 ◽  
Vol 12 (7) ◽  
pp. 214-219
Author(s):  
T. Khamkeo ◽  
◽  
S. Phaisansuthichol ◽  
P. Supapunt ◽  
M. K. Pholchan
Keyword(s):  
Waste Management ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Solid Waste Management ◽  
Management Strategies ◽  
Value Added ◽  
Ramsar Site ◽  
Integrated Solid Waste Management ◽  
Value Added Products

Quantification and characterization of municipal solid waste are vital information for a proper solid waste management. However, these are under-investigated and scarcely implemented in Laos PDR, especially the local communities. This work, therefore, aimed to quantify and characterize municipal solid waste generated from Beung Kiat Ngong Ramsar Site and to recommend possible integrated solid waste management strategies for a sustainable waste management. The average daily waste generation was estimated to be 3.6 kg/day and 2.6 kg/day in Thabou village and Kiat Ngong village, respectively. Organic waste appeared to be the biggest component (28%) for Thabou village, while packaging’s dominated waste composition in Kiat Ngong village. Interestingly, high percentage of golden apple shells waste were mismanaged. These had the potential to convert into value-added products such as calcium carbonate (CaCO3). It was found that fresh golden apple shells contained only 24.16±0.48 g/l as CaCO3, while incineration method increased higher CaCO3 products. The result showed that incineration at the temperature of 400 oC gave the highest amount of CaCO3 with the values of 1207.67±9.45 g/l as CaCO3. Based on the resources and the strength of the Ramsar site, the production of value added material from bio-waste could be integrated into waste management strategies along with 3Rs policies implementation.

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