Effects of culture and medium conditions on hydrogen production from starch using anaerobic bacteria

The influence of sodium on biohydrogen production from food waste by anaerobic fermentation

“…However, when the sodium concentration is increased to 28.70 g/l, the process can be inhibited with Shen. 18 A gradual decrease in pH can inhibit hydrogen production since pH affects the activity of the iron-containing hydrogenase enzyme 19 and the form of the acids produced during hydrogen production, so the hydrogen concentration decreased gradually and the yield no longer increased after 40 h. hydrogen concentration and production decreasing to 14.6% and 33.8 ml/g VS. The maximum specifi c hydrogen production of 154.8 ml/g VS was observed at sodium concentrations of 9.83 and 14.41 g/l.…”

Biohydrogen Production: Fundamentals, Challenges, and Operation Strategies for Enhanced Yield

“…Nitrogen is essential for cell synthesis, and hydrogen fermentation is affected by nitrogen concentration. Liu and Shen (2004) examined the effect of nitrogen supplementation ranging from 560 to 11,280 mg/L of NH 4 HCO 3 (99-1,999 mg N/L) on hydrogen production using synthetic starch wastewater (15 g starch/L). The authors observed the maximum hydrogen yield and the maximum specific hydrogen production rate at a NH 4 HCO 3 concentration of 5,640 mg/L (999 mg N/L).…”

“…Published studies show considerable variation in the optimal iron dosage needed for hydrogen production. For example, Liu and Shen (2004) reported 10 mg Fe 2+ /L as an optimal dose for hydrogen production from starch, whereas 589 mg Fe 2+ /L was optimal for sucrose, and 132 mg Fe 2+ /L for food wastes using mixed cultures . Such variability essentially is governed by the types of wastes, cultures used, and operating conditions (e.g., pH, HRT, and temperature).…”

Biofuel From Cellulosic Mass with Incentive for Feed Industry Employing Thermophilic Microbes

“…Anaerobically photoautotrophic and photoheterotrophic in presence of light and aerobically chemoheterotrophic microbes in the dark can accomplish consumption of various types of organic matter (Levin et al, 2004;Nakadomi et al, 1999). Concentrated latex wastewater (Choorit et al, 2002), aquarium wastewater (Nakadomi et al, 1999) and agricultural waste (Arooj et al, 2007;Fang & Liu, 2002;Hiraishi et al, 1989;Liu & Shen, 2004;Wang et al, 2007;Yang & Shen, 2006;Yokoi et al, 2001) and sewage wastewater treatment (Li & Fang, 2007;Nagadomi et al, 2000) are main types of wastes that are treated with purple non sulfur bacteria. These bacteria directly convert organic carbon into biomass that is suitable for direct reuse e.g., single cell protein (Kobayashi & Tchan, 1973).…”

“…Efficiency of conversion of light energy to hydrogen is the key factor for the realization of hydrogen production from biological systems Kondo et al, 2002;Shi & Yu, 2005). Batch tests using mixed cultures have demonstrated that very low pH's and high substrates, such as starch concentrations can reduce biohydrogen production (Liu & Shen, 2004;Van Ginkel & Sung, 2001;Zhang & Shen, 2006).…”