Taguchi experimental design for electrocoagulation process using alternating and direct current on fluoride removal from water

The aim of this study is to examine the effect of operational parameters on fluoride removal using electrocoagulation method. For this purpose, various operational parameters including initial pH, initial fluoride concentration, applied current, reaction time, electrode connection mode, anode material, electrolyte salt, electrolyte concentration, number of electrodes and interelectrode distance were investigated. The highest defluoridation efficiency achieved at initial pH 6. In the case of initial fluoride concentration, maximum removal efficiency (98.5%) obtained at concentration of 25mg/l. The increase of applied current and reaction time improved defluoridation efficiency up to 99%. The difference of fluoride removal efficiencies between monopolar and bipolar series and monopolar parallel were significant, especially at reaction time of 5 min. When aluminum used as anode material, higher removal efficiency (98.5%) achieved compared to that of iron anode (67.7%). The best electrolyte salt was NaCl with the maximum defluoridation efficiency of 98.5% compared to KNO3 and Na2SO4. The increase of NaCl had no effect on defluoridation efficiency. Number of electrodes had little effect on the amounts of Al3+ ions released in the solution and as a result defluoridation efficiency. Almost the same fluoride removal efficiency obtained for different interelectrode distances.

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Optimization studies for hydrothermal gasification of partially burnt wood from forest fires for hydrogen-rich syngas production using Taguchi experimental design

Environmental Pollution ◽

10.1016/j.envpol.2021.117040 ◽

2021 ◽

Vol 283 ◽

pp. 117040

Author(s):

Jude A. Okolie ◽

Sonil Nanda ◽

Ajay K. Dalai ◽

Janusz A. Kozinski

Keyword(s):

Experimental Design ◽

Forest Fires ◽

Taguchi Experimental Design ◽

Syngas Production ◽

Burnt Wood

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Using Taguchi Experimental Design to Investigate Operating Variables That Significantly Affect Wear in Mud Pumps

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1243/pime_proc_1995_209_403_02 ◽

1995 ◽

Vol 209 (1) ◽

pp. 29-40

Author(s):

S H Mok ◽

D G Gorman

Keyword(s):

Experimental Design ◽

Normal Load ◽

Drilling Fluid ◽

Operating Conditions ◽

Taguchi Experimental Design ◽

Drilling Mud ◽

Test Rig ◽

Offshore Drilling ◽

Wear Rates ◽

Operating Variables

Maintenance of offshore drilling mud pumps is normally based on running hours. It is generally accepted, however, that time does not provide an accurate means of scheduling maintenance, given the varying operating conditions of the reciprocating mud pumps. The energy expended at the interaction of sliding surfaces is hypothesized to be a better alternative. The effects of operating variables on wear rates are investigated. A Taguchi experimental design was used to identify those factors that significantly affect wear. Within the confines of an experimental test rig, the normal load and abrasive sand content was found to have a significant effect on the specific wear rate of nitrile rubber sliding on steel in drilling fluid.

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