Industrial Waste
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RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1535-1542
Author(s):  
Claudia V. Lopez ◽  
Ashlyn D. Smith ◽  
Rhett C. Smith

Herein we report high strength composites prepared by reaction of sulfur, plant oils (either canola oil or sunflower oil) and brown grease.


2022 ◽  
Vol 1212 (1) ◽  
pp. 012036
Author(s):  
N Chairunnisa ◽  
H Ruzhanah ◽  
Hairida ◽  
L.S Daniel

Abstract The success of preplaced aggregate concrete technology depends on two main factors which are potential grout and coarse aggregate. This research was conducted experimentally to determine the effect of using two different fly ash sources as an alternative for the partial replacement of cement and several size and shapes of coarse aggregate on the compressive and tensile strength of PAC specimens. This involved the use of seven concrete mixes with a low water-cement ratio of 0.4 and cement to sand ratio of 1:0.75 to produce standard cylinder specimens of concrete containing rounded and crush aggregate. Moreover, fly ash was added at a dosage of 5% and 10% of cement weight while three shapes and sizes of a rounded and crushed aggregate at 20 mm, 30 mm, and a mixture of the two were also applied. The results showed the compressive strength of specimens with different sizes or a mix of rounded aggregate in PAC exhibited a similar performance with 30 mm of crushed coarse aggregate. Furthermore, the specimen with a higher content of calcium fly ash demonstrated a more rapid strength at an early age of seven days than those with lower content. Therefore, the partial replacement of cement with industrial waste material in the form of fly ash in preplaced aggregate concrete has the ability to save up to 10% of cement and also produce certain environmental benefits.


2021 ◽  
Vol 14 (1) ◽  
pp. 331
Author(s):  
Rajesh Kumar ◽  
Abhishek Srivastava ◽  
Rajni Lakhani

Lightweight aggregate concrete (LWAC) exhibits the advantages of thermal insulation, reduces energy consumption building costs, improves building efficiency and easy construction. Furthermore, the utilization of industrial wastes in concrete is advantageous in terms of environmental sustainability. In order to explore this, several researchers investigated the idea of integrating industrial wastes in LWAC. However, the lack of knowledge regarding the performance of industrial waste-based lightweight aggregate concrete hinders the adaptation of this concept and application of LWAC in the construction sector. Therefore, this paper summarizes the research in relation to the sustainable LWACs containing oil palm shell (OPS), lightweight expanded clay aggregate (LECA), vermiculite, perlite, pumice and sintered fly ash as lightweight aggregate, along with industrial wastes and strength-enhancing additives (viz. fibers, polymers, etc.). Firstly, desirable physical, chemical, morphological and mineralogical characterization of different lightweight aggregates are presented, and then a comprehensive overview on fresh, hardened, durability and thermal properties of LWAC incorporating industrial wastes are discussed in comparison with normal weight concrete. The review also highlights the current challenges and suggests the research gaps for further development of eco-friendly LWAC. It is concluded that vermiculite, perlite, pumice, OPS, sintered fly ash and LECA with some suitable industrial waste materials have the potential to be used in the construction sector. Moreover, LWAC with industrial waste has 50–65% lower carbon emission (kg CO2 eq/m3) in the environment. The scientific contribution of this paper provides insights into different LWACs and the knowledge base for future research and paradigm shift of using LWACs as more common alternative building materials.


Author(s):  
D. Е. Ausharipova ◽  
R. A. Аlshanov ◽  
L. B. Kulumbetova

The purpose of the article is to explore and evaluate the possibilities of developing a «green» business in the waste sector of the Republic of Kazakhstan. One of the main directions of the implementation of the Action Plan for the transition of the Republic of Kazakhstan to a «green» economy is the area of waste management. The development of industrial enterprises and the increase in the population of Kazakhstan leads to an unconditional increase in the volume of household and industrial waste, in connection with which the problem of competent waste management is urgent. The existing system of waste management in the Republic of Kazakhstan do not effective: the formation of many spontaneous garbage dumps, most landfills do not meet the requirements of environmental and sanitary safety, there is an annual increase in waste generation with an insignificant level of their collection and processing into secondary raw stock, materials and goods. The practical significance of the study lies in the analysis of the possibilities for the development of «green» business in the field of waste and the identification of problems hindering innovative entrepreneurship in this area.


Author(s):  
Mr. Sunil Donga

Abstract: Red mud is industrial waste and causing threat to environment so to reduce the cost of the construction also to make structure more durable. Aluminium is now consumed during manufacture red mud, which is used and while remaining red mud has been undertaken sothat it can be used for construction fashion of the concrete by blending or by replacing the cement by red mud. Keywords: Red mud, self-compacting concrete, Compressive Strength, Tensile Strength, Flexural Strength


Author(s):  
Ирина Сергеевна Медянкина ◽  
Владимир Михайлович Скачков ◽  
Лилия Александровна Пасечник

Предложен способ получения высокодисперсного аморфного кремнезема из отходов обогащения низкотитанистых ванадий содержащих титаномагнетитов АО «ЕВРАЗ Качканарский ГОК» - хвостов мокрой магнитной сепарации. Применение раствора гидрофторида аммония ( NHHF) позволяет практически селективно извлечь кремний в раствор в виде гексафторосиликата аммония. Степень извлечения кремния раствором 1,0 - 2,5 мас.% NHHF за 6 часов составляет 46%. Диффузионный процесс выщелачивания кремния из ХММС описывается кинетическим уравнением 1 -(1 -а) = 0,0043• exp(-5230/RT)-г . Аморфный кремнезем SiO, полученный золь- гель методом из фторидного кремнийсодержащего раствора, имеет высокоразвитую поверхность S = 320 м/г, рассчитанный из средней плотности «белой сажи» размер частиц составляет d = 10 нм. Увеличение концентрации NHHF до 20 мас.% приводит к повышению растворимости кремния, а также других компонентов хвостов мокрой магнитной сепарации, которые являются нежелательными примесями в конечном продукте SiO. В целом показана перспективность гидрохимического выщелачивания кремнийсодержащих промышленных отходов - хвостов мокрой магнитной сепарации слабыми растворами гидрофторида аммония для синтеза чистого аморфного SiO. A method for producing amorphous silica from the enrichment wastes of low-titanium vanadium containing titanomagnetites of JSC «EVRAZ ZSMK» - wet magnetic separation tailings is proposed. The use of a NHHF solution makes it possible to practically selectively extract silicon into the solution in the form of ammonium hexafluorosilicate. The extraction of silicon with 1,0 - 2,5 wt.% NHHF solution for 6 hours reached 46%. The diffusion process of the silicon extraction is described by the kinetic equation 1 - (1 - a) = 0,0043 • exp(-5230 / RT)• t . Amorphous silica obtained by the sol-gel method from a fluoride silicon-containing solution has a highly developed surface 320 m/g, the particle size calculated from the average density of «white carbon black» is of 10 nm. The increase in concentration to 20 wt. % NHHF leads to the rise of the silicon solubility and of other tailings components, which are unwanted impurities in the final product. In general, it is shown that the hydrochemical leaching of silicon-containing industrial waste - tailings with weak solutions of ammonium hydrofluoride is promising for the synthesis of pure amorphous silica.


Author(s):  
Cherono Vivian

Lake Nakuru National Park is choking of solid and liquid waste pollutants emanating from upstream more so during the windy and rainy seasons. Due to the nature of terrains, most of the flashflood water and the drainage system find its way to the lake. The strong winds from the upper area of the town collect waste which ends up on top of the forest trees around the lake. Further, at times the sewer system bursts and discharges the raw sewer to the park. These unfortunate incidences lead to damage or destruction of the ecosystem that has been protected over the years. The purpose of the study was to examine the influence of Corporate Social Responsibility on Industrial Waste Management within Nakuru Environs and Lake National Park. The study adopted Stakeholders and Institutional theories for its study. A sample of 55 employees of Lake Nakuru National Park and 15 Community Business Leaders were used for the study. Primary data was collected using questionnaires and interview schedule. It was established that an effective industrial waste management practices on the environment has positive economic effects for businesses prosperity, flora and fauna conservation as well as a sustainable environmental. Environmental conservation awareness trainings for most businesses had been undertaken. Most of the business people held some sense of responsibility on managing waste as they conduct their businesses but the issue mainly lies on the part of the consumer’s disposal of packaging materials. Consumers were also becoming increasingly aware, sensitive and alive to the fact that a clean and safe environment is important. The emerging model shows the need to shift from the traditional 3Rs to 5Rs, owing to changes in national environmental policies, which emphasis on the use of Repackaging of products in terms of quality management, and reduce as additional waste management practices, thus, a shift from the 3Rs to 5Rs. The study recommended that the Ministry of Environment and Natural Resources should mobilize financial, technical and physical resources for building the capacity of the local community, and the business community towards effective industrial waste management. There should be strict compliance to industrial waste management policies by all stakeholders. Emphasis on the 5R’S from the marketing perspective was also recommended. This way, waste will be minimized and the environment will be conserved. The recommendations will be beneficial to the County Government, the Business Community as well as the Park Management. It can also assist the National government in formulating policies that can assist in addressing issues to do with environmental concerns and management. KEY WORDS: Corporate Social Responsibility, Industrial Waste Management, Environmental Education Programs, Waste Management Infrastructure, Recycling


Inorganics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Meriem Sassi ◽  
Andrea Simon

Aluminium dross is a hazardous industrial waste generated during aluminium production. It contains metallic oxides of aluminium and magnesium, other phases (aluminum nitride), and residues of fluxes and salts from the melting process of aluminium. Discarding this by-product is considered an environmental and economic challenge due to the high reactivity of dross with water or even air humidity. After removing the hazardous components from the as-received dross, one of the optional approaches is to incorporate the treated dross into construction materials. Dross is applied in several types of research as a secondary raw material source for alumina, clinker, cement or glass-ceramic production, but only a few papers focus on the usage of dross as a foaming agent for foams. Even fewer research are reported where dross was applied as a basic component of foam glasses. In this work, foam glasses were produced completely from waste materials: Aluminium dross, container (SLS) glass, and cathode ray tube (CRT) glass. The research holds several specificities, i.e., combining two industrial waste materials (CRT glass and dross), and adding an increased amount from the wastes. The physical and mechanical characteristics were examined with a special focus on the effect of the foam glass components on the microstructure, density, thermal conductivity, and compressive strength.


Author(s):  
José Stênio Aragão Rebouças ◽  
Fernando Pablo Silva Oliveira ◽  
Alan Carvalho de Sousa Araujo ◽  
Helena Leão Gouveia ◽  
Juliana Machado Latorres ◽  
...  
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