Techno-economic assessment of various hydrogen production methods - A review.

https://espace.library.uq.edu.au/view/UQ:e546bc9/UQe546bc9_OA.pdf

Improving the stability and efficiency of anaerobic digestion of food waste using additives: A critical review

Biohydrogen is a promising low-carbon energy vector because its high energetic density, and emerging technologies has been studied aiming achieving higher efficiency and competitive H2 production, as is the case of dark fermentation. The objective of this paper is to review dark fermentative biohydrogen production from lignocellulosic biomass, presenting insights of biomass pretreatment methods, influential factors in dark fermentation, and environmental and economic aspects. Rice, corn, and wheat residues have been the main lignocellulosic sources studied, and biohydrogen production ranged from 12 to 7019 mL H2/L. This wide variation is due to the source of lignocellulosic and its pretreatment method, the source and treatment conditions of the inoculum, and the operational conditions of dark fermentation. Acid hydrolysis has been the most applied method to breakdown the complex structure of lignocellulosic biomass, and enzymatic hydrolysis has been used in sequence to improve the process. Moreover, additives (mainly metal materials) have been studied to enhance dark fermentation and lignocellulosic biomass pretreatment. Heat-treated mixed culture is the main used source of inoculum – 100 °C for 30 min is the most usual condition. Temperature, pH, and hydraulic retention time (HRT) have also high influence in the biohydrogen production and yield. Mesophilic temperatures (around 37 °C), pH near 7.0, and HRT of 72 h, are recurrent parameters of dark biohydrogen fermentation. Finally, most studies focused on laboratory scale, which suggest advanced studies on a large scale, and alternatives to improve lignocellulosic biomass pretreatment and biohydrogen production is necessary to make this technology efficient, economical and sustainable.

Dark fermentative biohydrogen production from lignocellulosic biomass: Technological challenges and future prospects

Biohydrogen production from food waste: Current status, limitations, and future perspectives.

https://escholarship.org/content/qt2jd3r4qd/qt2jd3r4qd.pdf?t=qr01mg

Biofuels for a sustainable future.

In this study, the feasibility of biohydrogen production from enzymatic hydrolysis of food waste was investigated. Food waste (solid-to-liquid ratio of 10%, w/v) was first hydrolyzed by commercial glucoamylase to release glucose (24.35 g/L) in the food waste hydrolysate. Then, the obtained food waste hydrolysate was used as substrate for biohydrogen production in the batch and continuous (continuous stirred tank reactor, CSTR) systems. It was observed that the maximum cumulative hydrogen production of 5850 mL was achieved with a yield of 245.7 mL hydrogen/g glucose (1.97 mol hydrogen/mol glucose) in the batch system. In the continuous system, the effect of hydraulic retention time (HRT) on biohydrogen production from food waste hydrolysate was investigated. The optimal HRT obtained from this study was 6 h with the highest hydrogen production rate of 8.02 mmol/(h·L). Ethanol and acetate were the major soluble microbial products with low propionate production at all HRTs. Enzymatic hydrolysis of food waste could effectively accelerate hydrolysis speed, improve substrate utilization rate and increase hydrogen yield.

/pdf/biohydrogen-production-from-enzymatic-hydrolysis-of-food-1mbothalmr.pdf

Biohydrogen production from enzymatic hydrolysis of food waste in batch and continuous systems.

Techno-economic analysis of a novel bioprocess combining solid state fermentation and dark fermentation for H2 production from food waste

The invention discloses a method for power generation by taking high-starch solid-state waste as a substrate microbial fuel cell. The method belongs to the field of biomass energy. The method comprises the steps of firstly, pro-processing the high-starch solid-state waste by enzymatic hydrolysis, and hydrolyzing the high-starch solid-state waste to a glucose-rich liquid hydrolysis product; and secondly, adding the acquired hydrolysis product into a microbial fuel cell reactor by taking the hydrolysis product as a positive electrode substrate, simultaneously adding a certain amount of sludge into a positive electrode chamber, and generating power by an effect of electrogenesis bacteria. By the method, the hydrolysis and liquidation speed of the high-starch solid-state waste can be increased, and the conversion rate of an organic culture substrate and the power generation efficiency of the microbial fuel cell can also be improved; and organic solid rubbish is processed, meanwhile, a clean and sustainable electric energy is also generated, waste is turned into wealth, and energy crisis is relieved.

Yingting Yan

Papers

Biohydrogen production from enzymatic hydrolysis of food waste in batch and continuous systems.

Techno-economic analysis of a novel bioprocess combining solid state fermentation and dark fermentation for H2 production from food waste

Method for power generation by taking high-starch solid-state waste as substrate microbial fuel cell