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Addis Lemessa Jembere

Bio: Addis Lemessa Jembere is an academic researcher from Bahir Dar University. The author has contributed to research in topics: Langmuir adsorption model & Adsorption. The author has an hindex of 1, co-authored 4 publications receiving 2 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a study aimed at degrading melanoidin pigment from distillery spent wash by using impregnated Sugarcane bagasse activated carbon (SCBAC) and Modified Bagasse fly ash (MBFA) as a comparative study.

9 citations

Journal ArticleDOI
01 Dec 2021
TL;DR: In this paper, the effect of using waste LDPE plastic as a modifier of virgin bitumen is investigated and the advantage of using wet blending method over dry is also tried.
Abstract: Overwhelming increase in plastic waste since recent years became series ecological issue for both developed and developing countries. Compromising the large plastic waste potential in Ethiopia and poor pavement performance in the roads due to severe weather and high traffic loads, it is viewed to use this in-hand resource as asphalt modifier to urge sustainability, enhance the stability of asphalt mix and reduce the amount of bitumen used. The study aimed at investigating the effect of using waste LDPE plastic as a modifier of virgin bitumen. This study also tries to amplify the advantage of using wet blending method over dry. Four modified bitumen mixes prepared with 4, 6, 8 and 10% waste LDPE plastic content by the weight of optimum bitumen content (OBC) at different mixing temperatures (160, 170, and 180 °C) and different mixing times (1, 1.5 and 2 hours) to evaluate penetration point, softening point and ductility. 170 °C mixing temperature and 1.5 hour mixing time results, homogeneous mix between bitumen and waste LDPE plastic materials compared to other mixing temperatures and mixing times. Marshall Test Method was used to determine the optimum bitumen content and to evaluate the marshal properties of the plastic modified asphalt mix. The OBC of non-modified marshal sample was found to be 5.16% by weight of the total aggregate while the optimum waste LDPE modified bitumen content was found to be 6.5% by weight of the OBC. Asphalt mix modified with 6.5% of waste LDPE plastic content has 33.67% higher stability value compared to the non-modified asphalt mix.

7 citations

Journal ArticleDOI
TL;DR: In this article, three types of filter cake kaolin adsorbents were prepared using different method to remove hexavalent chromium Cr (VI) from aqueous solution.

4 citations

Journal ArticleDOI
TL;DR: The experimental dataset presents the extraction of cheese from the soya bean (Belessa-95 or Glycine max) and the effects of soaking time and types of coagulants on the overall properties of extracted soy cheese were analyzed.

Cited by
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01 Jan 1912

1,225 citations

Journal ArticleDOI
TL;DR: In this article, a study aimed at degrading melanoidin pigment from distillery spent wash by using impregnated Sugarcane bagasse activated carbon (SCBAC) and Modified Bagasse fly ash (MBFA) as a comparative study.

9 citations

Journal ArticleDOI
TL;DR: In this article , the transformation of Sargassum seaweed into activated carbon (AC) via phosphoric acid thermochemical activation was explored in an effort to increase the value of Sarpa seaweed biomass.
Abstract: Adsorption is one of the most successful physicochemical approaches for removing heavy metal contaminants from polluted water. The use of residual biomass for the production of adsorbents has attracted a lot of attention due to its cheap price and environmentally friendly approach. The transformation of Sargassum—an invasive brown macroalga—into activated carbon (AC) via phosphoric acid thermochemical activation was explored in an effort to increase the value of Sargassum seaweed biomass. Several techniques (nitrogen adsorption, pHPZC, Boehm titration, FTIR and XPS) were used to characterize the physicochemical properties of the activated carbons. The SAC600 3/1 was predominantly microporous and mesoporous (39.6% and 60.4%, respectively) and revealed a high specific surface area (1695 m2·g−1). To serve as a comparison element, a commercial reference activated carbon with a large specific surface area (1900 m2·g−1) was also investigated. The influence of several parameters on the adsorption capacity of AC was studied: solution pH, solution temperature, contact time and Cr(VI) concentration. The best adsorption capacities were found at very acid (pH 2) solution pH and at lower temperatures. The adsorption kinetics of SAC600 3/1 fitted well a pseudo-second-order type 1 model and the adsorption isotherm was better described by a Jovanovic-Freundlich isotherm model. Molecular dynamics (MD) simulations confirmed the experimental results and determined that hydroxyl and carboxylate groups are the most influential functional groups in the adsorption process of chromium anions. MD simulations also showed that the addition of MgCl2 to the activated carbon surface before adsorption experiments, slightly increases the adsorption of HCrO4− and CrO42− anions. Finally, this theoretical study was experimentally validated obtaining an increase of 5.6% in chromium uptake.

5 citations

Journal ArticleDOI
TL;DR: In this article , a review paper focuses on research done on utilizing plastic wastes as a modifier in a bituminous mix of flexible pavement, which has become an attractive option because this improves flexible pavement performance and eliminates the environmental problem.
Abstract: With the rapid population growth, the annual plastic waste generation is increasing. There is a dire need for reusing plastic waste. If plastic waste is not recycled it ends up in landfills; ocean garbage patches or is incinerated; which causes different environmental problems, and if pollution from incineration plants is controlled then the plant becomes so expensive that not all countries can afford it. The addition of plastic waste to the flexible pavement has become an attractive option because this improves flexible pavement performance and eliminates the environmental problem. Huge work is done on waste addition in the bituminous mix but this review paper focuses on research done on utilizing plastic wastes as a modifier in a bituminous mix of flexible pavement.

5 citations

Journal ArticleDOI
TL;DR: In this paper , a polyethyleneimine functionalised pomelo-peel (PP) derived aerogel (PEI-PPA) was used for the removal of melanoidins from spent wash.

4 citations