Accelerated Life Testing

Denis, Laurent; Grzeskowiak, Henri; Trias, Daniel; Delaux, David

doi:10.1016/b978-1-78548-261-8.50001-2

Cited by 6 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, this value is higher than expected in relation to what was reported by other authors, who have stated a greater degree of reduction at the same time [49]. This low efficiency can be linked to an Arrhenius model effect in which the degree of reduction of Fe, sulfates, and an increase in the pH of the samples, will be gradually regulated until they are stable values [50]. The reduction in the sulfate content of the sample reveals the presence, interaction, and proliferation of sulfate-reducing bacteria (SBR) within the organic substrate, which consumes the present carbon and sulfates, which play a terminal receptor function of electrons for your metabolism [51].…”

Section: Discussioncontrasting

confidence: 52%

Treatment of Acid Drainage from Coal Mines Produced in the Boyacá Region, Colombia, using an Anaerobic Wetland with an Upward Flow

Blanco-Zúñiga

Chacón-Rojas

Villarraga-Castillo

et al. 2022

IyU

View full text Add to dashboard Cite

Coal mining represents one of the primary economic incomes in the department of Boyacá, Colombia. However, the acid mine drainage (AMD) generated has a tremendous environmental impact in the area due to the presence of sulfate ions (SO4-2), heavy metals, and low pH This article studies the behavior in the content of Fe and sulfates in AMD samples when treated within an artificial anaerobic vertical flow wetland, analyzing the concentration of these elementsand the content of dissolved oxygen (DO) and pH at different time intervals. The treatment of a MAD from the department of Boyacá was carried out using a bioreactor prototype with an organic substrate to provide the necessary conditions for the development of sulfate-reducing bacteria. Measurements were made with hydraulic retention times between 24 to 120 hours, monitoring the changes in the content of total Fe, SO4-2, pH, and DO. The data obtained show a reduction for total Fe of 88.3%, established at 5.61g∙m-2∙day-1, and for SO4-2 of 34.3% with 9.35g∙m-2∙day-1; reaching a maximum removal degree of 52.32% at 120h for sulfates and 92% for Fe, where the maximum removal peak is achieved, reducing the Fe removal rate for longer times. The reduction in the concentration of Fe is related to the reduction of DO and regulation of the pH, in addition to favoring the reduction of sulfate ions through the formation of the mineralogical phases pyrite and siderite. These data show that the anoxic conditions of the organic environment are maintained, for which a subsequent aeration stage is suggested.

show abstract

Section: Discussioncontrasting

confidence: 52%

Treatment of Acid Drainage from Coal Mines Produced in the Boyacá Region, Colombia, using an Anaerobic Wetland with an Upward Flow

Blanco-Zúñiga

Chacón-Rojas

Villarraga-Castillo

et al. 2022

IyU

View full text Add to dashboard Cite

show abstract

“…Apart from the selection of external factors and their intensity, the speed of these changes is also important. Results obtained from accelerated aging give an approximate assessment of resistance to aging [ 56 , 60 , 61 , 62 , 63 ].…”

Section: Accelerated Aging Of Polymeric Materialsmentioning

confidence: 99%

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

View full text Add to dashboard Cite

The determination of the secure working life of polymeric materials is essential for their successful application in the packaging, medicine, engineering and consumer goods industries. An understanding of the chemical and physical changes in the structure of different polymers when exposed to long-term external factors (e.g., heat, ozone, oxygen, UV radiation, light radiation, chemical substances, water vapour) has provided a model for examining their ultimate lifetime by not only stabilization of the polymer, but also accelerating the degradation reactions. This paper presents an overview of the latest accounts on the impact of the most common environmental factors on the degradation processes of polymeric materials, and some examples of shelf life of rubber products are given. Additionally, the methods of lifetime prediction of degradable polymers using accelerated ageing tests and methods for extrapolation of data from induced thermal degradation are described: the Arrhenius model, time–temperature superposition (TTSP), the Williams–Landel–Ferry (WLF) model and 5 isoconversional approaches: Friedman’s, Ozawa–Flynn–Wall (OFW), the OFW method corrected by N. Sbirrazzuoli et al., the Kissinger–Akahira–Sunose (KAS) algorithm, and the advanced isoconversional method by S. Vyazovkin. Examples of applications in recent years are given.

show abstract