Wyniki wyszukiwania - BazTech

1

Design a Multi Period Closed-Loop Supply Chain Program to Supply Recycled Products

Syah Rahmad, Chetthamrongchai Paitoon, Thuc Dao Chanh, Yuminarti Umi, Murtini Sri, Iswanto A. Heri, Vasilieva Nadezhda Konstantinovna, Kireeva Natalia, Aravindhan Surendar

Foundations of Computing and Decision Sciences

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2022

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Vol. 47, No. 2

163--176

EN

Over the course of the last decades, closed-loop supply chains (CLSC) and reverse logistics issues have attracted increasing attention owing to strict environmental laws, social responsibilities, economic interests, and customer awareness. Hence, the issue of closed-loop supply chain and reverse logistics has emerged as a field of research in the new era. This issue has received much attention because it allows recyclable products to return to their original cycle. Therefore, this study primarily intends to present a mathematical model for designing a supply chain network for recycled products. The multi-stage and multi-period objective function of the closed-loop supply chain is presented to meet that aim. In this chain, dismantling, recycling, and disposal centers are considered. The objective function is to reduce the total cost of the closed-loop supply chain. The results of optimizing the mathematical model demonstrate that this model has the necessary efficiency for use in recycled products.

2

Resistance to Seawater of a New Cement Mortar Based on Additions of Recycled Product

Harbi Radhia, Derabla Riadh, Nafa Zahreddine

Civil and Environmental Engineering Reports

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2021

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Vol. 31, no. 4

249--271

EN

This paper aims to explore some sustainability indicators including mainly the resistance to seawater of mortars containing 5% kaolin filler in the sand and different types of ecoproducts as cement additions. To this end, an experimental study was carried out with the aim of evaluating the effects of three types of cement additions (glass powder (GP), metakaolin (MK) and brick waste (BW)) with contents of 5, 15 and 25% as well as binary and ternary combinations of these same additions. The results obtained made it possible to show the effectiveness of filler and cement additions (glass powder (GP) or / and metakaolin (MK) compared to brick waste (BW)) in improving the durability of mortars against aggressive agents such as seawater. In the end, the cement mortars made from 25% MK, 25% GP and this compound of 5% GP and 25% MK showed good resistance to attack by seawater.

3

Chemical composition and phase constitution of recycled metals from computer scrap

Michalski B., Sielicki K., Leonowicz M., Szymański M., Miazga Z.

Environment Protection Engineering

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2016

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Vol. 42, nr 1

101--112

EN

Studies done on recycled products gained from computer boards have been presented. Alloys fabricated by melting of computer boards were investigated in detail. It was found that the alloy is segregated into two regions - copper and iron rich, in which other alloying elements, forming either solid solutions or intermetallic phases, are dissolved. Scale from melting and sediment from etching metals in hydrochloric acid were also studied. In the scale fluxing agents and residual of metals were gathered, whereas in the sediment some amount of noble metals was detected. Microscopic investigations and chemical composition measurements were performed on alloys from melted boards as well as on the scale and the sediment.

4

Wpływ emitantów i substancji migrujących z tworzyw sztucznych na wrażenie zapachu powietrza oraz smaku i zapachu wody

Błędzki A. K., Łucka M.

Polimery

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2003

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T. 48, nr 9

598-605

PL

Na podstawie danych z literatury (w tym prac własnych) scharakteryzowano proces emisji substancji lotnych z tworzyw sztucznych podczas ich przetwórstwa (wtryskiwania, wytłaczania) oraz użytkowania w pomieszczeniach zamkniętych (wnętrza samochodów, budynki). Omówiono najważniejsze metody określania ilościowego, a także identyfikacji substancji zapachowych emitowanych zarówno z nowo wytworzonych tworzyw, jak i (zwłaszcza) z recyklatów, mianowicie: chromatografię gazową, zastosowanie "elektronicznych nosów" i olfaktometrię. Podano również sposoby ograniczenia emisji np. w wyniku wielokrotnego odgazowania podczas wytłaczania recyklatu, ekstrakcji ewentualnych zanieczyszczeń rozpuszczalnikiem organicznym oraz wprowadzenia dodatków absorbujących substancje gazowe. Jako odrębnie omawiane zagadnienia potraktowano wpływ emitan-tów, a także substancji migrujących na smak i zapach wody przesyłanej przez rury z tworzyw sztucznych.

EN

The process of volatile substances emissions from plastics during their processing (injection molding, extrusion) and using in the closed spaces (car interiors, buildings) (Fig. 1) has been characterized on the basis of literature data (including authors' research). There were discussed the most important methods of identification and quantitative determination of odor substances, emitted from virgin plastics as well as (specially) recycled ones, namely gas chromatography (Figs. 2 and 3) "electronic noses" use (Figs. 4 and 5) and olfactometry (Fig. 6). The ways of the emissions limitation e.g. multiple degassing during the recycled products' extrusion (Fig. 7), extraction of eventual pollutants with organic solvent (Fig. 8) or introduction of the additives absorbing the gas substances (Fig. 9) were proposed. The effects of the emitted and migrating substances on the flavor and odor of water delivered using plastic pipes have been treated separately.