Anaerobic digestion for methane generation and ammonia reforming for hydrogen production: A thermodynamic energy balance of a model system to demonstrate net energy feasibility

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

“…Ammonia present in the effluents of the anaerobic sludge digesters can be also considered as a source of hydrogen. NH 3 can be converted into N 2 and H 2 by a catalytic reaction in gas phase after its stripping from the liquid phase (Babson et al, 2013) or its electrolysis directly in liquid phase (Bonnin et al, 2008;Gwak et al, 2016;Zhang et al, 2017). Electrolysis seems a more viable way to obtain hydrogen since it can be carried out at ambient temperature in contrast to the catalytic reaction that needs temperatures around 800-900 • C. Theoretically, the electrolysis of ammonia consumes 1.55 W h/g H 2 ( Table 2) (Boggs and Botte, 2009).…”

Liquid fertilizer products from anaerobic digestion of food waste: mass, nutrient and energy balance of four digestate liquid treatment systems

“…However, the digestate has usually unbalanced nutrient ratios for plant growth (Camilleri-Rumbau et al, 2014). Large mass due to high water content increases the transportation need of the digestate, as the AD plants treating municipal FW are usually located far from agricultural lands (Babson et al, 2013). Digestate treatment by solid-liquid separation is an increasingly used treatment for the production of phosphorus containing solid digestate and liquid digestate containing water-soluble nitrogen and potassium.…”

A review on green liquid fuels for the transportation sector: a prospect of microbial solutions to climate change

“…The hyper NH3-producing bacteria belong primarily to the genera Clostridium, Eubacterium, where, [NH3-N] is the concentration of N in NH3 and Ka is the temperature dependent dissociation coefficient. To improve NH3 production during anaerobic digestion, Babson et al (2013) developed an approach in the process that shifts the production of CH4 towards NH3 synthesis. By adjusting the C:N ratio in the digestion feedstock, approximately 61% of total N flux was converted to NH3 (Babson et al, 2013).…”

“…To improve NH3 production during anaerobic digestion, Babson et al (2013) developed an approach in the process that shifts the production of CH4 towards NH3 synthesis. By adjusting the C:N ratio in the digestion feedstock, approximately 61% of total N flux was converted to NH3 (Babson et al, 2013). Integration of a separate hydrolysis fermenter upstream of the anaerobic digester has been reported to prevent NH3 toxicity to fermenting microorganisms and enhance digester stability (Babson et al, 2013).…”

“…By adjusting the C:N ratio in the digestion feedstock, approximately 61% of total N flux was converted to NH3 (Babson et al, 2013). Integration of a separate hydrolysis fermenter upstream of the anaerobic digester has been reported to prevent NH3 toxicity to fermenting microorganisms and enhance digester stability (Babson et al, 2013). A novel process was patented in 2014 involving enzymatic hydrolysis of food industry wastes followed by microbial submerged fermentation (preferably Clostridium spp.…”