Parametric optimization of the dark fermentation process for enhanced biohydrogen production from the organic fraction of municipal solid waste using Taguchi method

Performances investigation and multi‐objective optimization of gas foil bearings in hydrogen fuel cell vehicles

“…The orthogonal array was designed based on the Taguchi method to minimize the simulation cost and find most of the information 36 . Alavi‐Borazjani 37 optimized the dark fermentative H 2 production based on the Taguchi method, which designed and conducted the experiments using the L 16 orthogonal array. Sağır et al 38 used the Taguchi method to investigate the impact of temperature, pH, reducing agent concentration, and reduction rate as independent process parameters on the hydrogen generation rate.…”

Biohydrogen production through dark fermentation from waste biomass: Current status and future perspectives on biorefinery development

“…The metal ions such as Fe + , Ni + , Mg 2+ , Cu + , and Zn + have been shown to positively affect the Ni-Fe, Fe-Fe hydrogenase, and Acetyl-CoA synthase enzymatic activities [50]. The continuous feeding of macro and micronutrients flourishes the activity of hydrogen-producing bacteria in a parental reactor, which can be used further in inoculating DF reactors [51]. However, a long-term operation of the DF reactor may prevail in conditions suitable for culturing hydrogen-producing bacteria.…”

“…These include pH, temperature, HRT, feeding rate, hydrogen partial pressure, etc. [29,51,112]. Among them, the pH value is a primary DF process parameter.…”

“…Lower ISR reduces the fermentation activity, whereas higher ISR increases the inter-microbial competition, which could eventually lead to the growth inhibition of the hydrogen-producing microbial cells [51]. A maximal biohydrogen yield of 62.5 mL H2/g VS was achieved in a DF reactor treating OFMSW under the optimized conditions of 6 g VS/L d feeding rate, 55 ℃ temperature, and ISR of 0.5 for an operational period of 4 d. The ISR of 0.25 resulted in a low hydrogen yield relative to the results at an ISR of 0.5 [51]. This is because of the competition within the microbial community, which may result in an incomplete substrate-to-hydrogen conversion.…”

“…It is also conceivable that the fast-growing hydrogenconsuming microorganisms predominate the microbial community under those conditions. Alavi-Borazjani et al [51] suggested that substrate concentration is the predominant factor governing the DF process parameters, followed by ISR and temperature.…”