Co-digestion of food waste and sludge for hydrogen production by anaerobic mixed cultures: Statistical key factors optimization

Bio-Hydrogen Production from Pineapple Waste Extract by Anaerobic Mixed Cultures

“…A high substrate concentration, not exceeding the substrate inhibition level, in the fermentation broth resulted in a high P s because substrate was used to produce hydrogen. An increase in the substrate concentration higher than optimum level might develop osmotic pressure inside the microbial cells, which can cause cell damage due to the permeation of water molecules out of the cells [12]; hence a reduction of hydrogen production occurred. In addition, an increase in substrate concentration could have led to a partial pressure of hydrogen build-up in the fermentation system.…”

Media optimization for biohydrogen production from waste glycerol by anaerobic thermophilic mixed cultures

“…HP reduction was found when the amount of Endo-nutrient addition was greater than 0.20 mL/L. This may be caused by the dissolution of biocarbonate in NH 4 HCO 3 which increases CO 2 and reduces hydrogen content in gas phase in the fermentation system [13,31]. In addition, high ammonia concentration can also cause the adverse effect on microorganisms as described above.…”

“…Co 2þ , and Mg 2þ are enzyme cofactor [11,13,29,30]. NH 4 HCO 3 in the Endo-nutrient can prevent the fluctuation of the pH during hydrogen production [12,31]. HP reduction was found when the amount of Endo-nutrient addition was greater than 0.20 mL/L.…”

“…In addition, high ammonia concentration can also cause the adverse effect on microorganisms as described above. Moreover, Fe 2þ and Cu 2þ at high concentrations level than the optimum level are toxic, thus reducing the activity of hydrogen producers [13,31].…”

Statistical key factors optimization of conditions for hydrogen production from S-TE (solubilization by thermophilic enzyme) waste sludge

“…Thus, it is of great significance to find appropriate levels of different factors in order to increase the ability of anaerobic sludge to produce H 2 . Several researche rs have reported the optimization of fermentati on H 2 production by statistical method to investigate the effects of different factors on fermentative H 2 production (Shi et al, 2010;Sreela-or et al, 2011 ).…”