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Fekadu Melak     Senior Scientist or Principal Investigator 
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Fekadu Melak published an article in March 2019.
Top co-authors
Gijs Du Laing

117 shared publications

Department of Green Chemistry and Technology

Argaw Ambelu

39 shared publications

Department of Environmental Health Science and Technology, Jimma University, Jimma, Ethiopia

Esayas Alemayehu

3 shared publications

School of Civil and Environmental Engineering, Institute of Technology, Jimma University, Jimma, Ethiopia

5
Publications
26
Reads
4
Downloads
5
Citations
Publication Record
Distribution of Articles published per year 
(2016 - 2019)
Total number of journals
published in
 
5
 
Publications
Article 0 Reads 0 Citations Freeze desalination as point-of-use water defluoridation technique Fekadu Melak, Argaw Ambelu, Higemengist Astatkie, Gijs Du La... Published: 04 March 2019
Applied Water Science, doi: 10.1007/s13201-019-0913-0
DOI See at publisher website ABS Show/hide abstract
Freeze desalination, i.e., desalination of water by freezing it, may be an option to treat polluted water at individual household level. Taking into account the widespread fluoride contamination of Ethiopian water resources and with the reason that most households in semi-urban and urban areas do have easier accessibility of refrigerators, this study aimed to investigate the defluoridation capacity of freeze desalination and its energy consumption for different water sources. For this purpose, synthetic solutions that emulate the major ion compositions of natural waters (hereafter called simulated water), tap water, and double-distilled water to which variable concentrations of fluoride ions were added were evaluated using home-use insulated refrigerator (BEKO, RRN 2650). The effects of conditions such as initial fluoride concentration, multi-ion existence, fraction of ice frozen, volume of the container, and freezing duration were evaluated in relation to the produced ice quality. It was found that nearly 48% and 62% removal of fluoride were achieved from tap water spiked with 10 mg/L F− and 10 mg/L F− aqueous solutions, respectively, with a total water recovery of 85 to 90%. The energy consumption predicted to produce the ice from tap water spiked with 10 mg/L F− and double-distilled water alone was found to be 93.9 and 91.8 kJ/L, respectively. The results showed that freeze desalination can be a potential technique for fluoride removal from water to be used as drinking water at household level in semi-urban and urban areas as well as in colder regions.
CONFERENCE-ARTICLE 14 Reads 0 Citations Freeze desalination as point of use water treatment technology: A case of chromium (VI) removal from water Fekadu Melak Assaye, Argaw Ambelu, Gijs Du Laing, Esayas Ale... Published: 16 November 2017
Proceedings, doi: 10.3390/ecws-2-04942
DOI See at publisher website ABS Show/hide abstract

Options to develop tanning industries could be hindered even in the presence of huge leather industry raw materials due to the requirements of high-tech contaminant removal technologies, especially in developing countries. This study was initiated to investigate the efficiency of freeze desalination for Cr(VI) removal using refrigerators to generate fresh water. Synthetic solutions that represent major ion compositions of drinking water as well as deionized water to which known concentrations of Cr(VI) spiked into it, were added and frozen in a closed freezer unit. The effects of different parameters such as initial concentration, freeze duration, ice nucleation, fraction of ice volume, and influence of co-occurring ions were evaluated in relation to the quality of produced ice. The physicochemical characteristics of the produced meltwater were also evaluated. A high total water recovery of up to 85% was achieved in the experimental evaluation. Cr(VI) removal efficiency of up to 80% from simulated tap and 93 to 97% for deionized water spiked with Cr(VI) were found in this batch partial freezing. Freeze desalination was found to be relatively viable desalination technology in terms of quality of water produced, options on the use of cost effective refrigerants and technologies which could have a pertinent importance to save energy consumption of freezers.

Article 5 Reads 0 Citations Evaluation of natural quartz and zeolitic tuffs for As(V) removal from aqueous solutions: a mechanistic approach F. Melak, E. Alemayehu, A. Ambelu, E. Van Ranst, G. Du Laing Published: 10 July 2017
International Journal of Environmental Science and Technology, doi: 10.1007/s13762-017-1379-y
DOI See at publisher website
Article 7 Reads 0 Citations Use of porous volcanic rocks for the adsorptive removal of copper Esayas Alemayehu, Fekadu Melak, Saroj K. Sharma, Bart Van De... Published: 08 February 2017
Water and Environment Journal, doi: 10.1111/wej.12234
DOI See at publisher website
Article 0 Reads 4 Citations Application of freeze desalination for chromium (VI) removal from water Fekadu Melak, Gijs Du Laing, Argaw Ambelu, Esayas Alemayehu Published: 01 January 2016
Desalination, doi: 10.1016/j.desal.2015.09.003
DOI See at publisher website
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