https://arrow.tudublin.ie/cgi/viewcontent.cgi?article=1167&context=schfsehart

A Comprehensive Review on Pre-treatment Strategy for Lignocellulosic Food Industry Waste: Challenges and Opportunities

Bioconversion of organic wastes into biodiesel and animal feed via insect farming

http://umu.diva-portal.org/smash/get/diva2:1092517/FULLTEXT01

Green conversion of municipal solid wastes into fuels and chemicals

The increasing production of food waste worldwide and new international regulations call for the development of new technologies to treat this biowaste. Anaerobic processes are able to treat efficiently organic wastes, producing at the same time different value-added compounds. In addition, due to the lower costs and environmental impacts associated with these processes when compared to other options, they are among the most promising technologies for food waste treatment. This article reviews the state-of-the-art dealing with treatment of food waste by anaerobic processes, with emphasis on the most recent research carried out. The different processes that are assessed are anaerobic digestion for methane production, anaerobic fermentation for hydrogen and/or volatile fatty acids production and 2-stage systems. The primary issues associated with each alternative are presented, paying special attention to accumulation of ammonia and volatile fatty acids in the reactor. In addition, the latest developments to overcome the complications of each system are also described, focusing on how they improve its stability and performance. Moreover, the relevant economic and environmental research has also been reviewed, including several life cycle analyses that compare anaerobic processes with other technologies used for food waste treatment. Different case studies are also presented. Finally, recommendations for future research for the anaerobic processes studied and options for process integration are discussed. Moving towards the idea of a circular economy, a potential biorefinery for food waste valorization is also proposed.

Food waste valorization via anaerobic processes: a review

Investigating hydrothermal pretreatment of food waste for two-stage fermentative hydrogen and methane co-production.

Improving production of volatile fatty acids from food waste fermentation by hydrothermal pretreatment

The invention discloses a coupled two-phase anaerobic kitchen garbage strengthening treatment method combining a microbial electrolysis cell and a microbial cell and a device. The method is as follows: (1) pretreated kitchen garbage enters into a microbial electrolysis cell and acid production coupled acid production reactor, meanwhile acclimated anaerobic sludge is added, an external electric field is applied for hydrolysis and acidizing reaction to obtain hydrolized and acidized supernatant and biogas residue, and hydrogen generated on an electrode negative pole; (2) after the hydrolized and acidized supernatant is centrifuged, the pH value is adjusted, then the hydrolized and acidized supernatant is sent into a microbial cell and methane production coupled methane production reactor, the microbial cell comprises a methane production phase solution, a microbial cell positive pole, a microbial cell negative pole and an externally added electricity storage device, at the same time, an electric field is formed to promote the methane producing activity of methane production phase microbes, and methane is collected; the electricity generated by the microbial cell is used in the step (1). The method and the device can realize collecting of the methane and hydrogen during the rapid fermentation treatment process of the kitchen garbage, and realize the efficient resourceful treatment.

Coupled two-phase anaerobic kitchen garbage strengthening treatment method combining microbial electrolysis cell and microbial cell and device

The invention discloses a kitchen waste aerobic fermentation treatment process based on the regulation and control of moisture forms. The kitchen waste aerobic fermentation treatment process comprises the following steps; (1) collecting kitchen waste, separating oil from water, removing impurities and crushing to obtain crushed kitchen waste; (2) regulating the moisture content of the crushed kitchen waste to be 50 to 75 percent, mixing the crushed kitchen waste and an aerobic fermentation bacteria agent, performing aerobic fermentation, adjusting the content of the total cellulose of an aerobic fermentation system before aerobic fermentation is started to be 15 to 25 percent, or adding a water-retaining agent into the aerobic fermentation system to realize the regulation and control of the moisture forms in the kitchen waste aerobic fermentation system. According to the kitchen waste aerobic fermentation treatment process based on the regulation and control of the moisture forms, the efficiency of the kitchen waste aerobic fermentation is improved by the regulation and control of the moisture forms in the kitchen waste aerobic fermentation system.

Kitchen waste aerobic fermentation treatment process based on regulation and control of moisture forms

The invention discloses a vitrified formula of wet process smelt slag and a vitrified innocent treatment process. The process comprises the following steps: (1) dehydrating and initially drying the wet process smelt slag; separately crushing and screening calcium-containing minerals, silicon-containing minerals, sodium-containing minerals and waste glass; (2) mixing at least one of the screened calcium-containing minerals, silicon-containing minerals, sodium-containing minerals and waste glass with the dried wet process smelt slag and waste activated carbon in proportion to obtain a mixture; and (3) after secondarily drying the obtained mixture, performing high-temperature calcining to obtain a vitrified product. Innocent treatment of the wet process smelt slag is realized by way of smelted vitrification. From the aspects of being simple and feasible and universal, innocent treatment of the wet process smelt slag is realized by way of vitrification by means of the wet process smelt slag, calcium-containing minerals, silicon-containing minerals, sodium-containing minerals and waste activated carbon.

Vitrified formula of wet process smelt slag and vitrified innocent treatment process

The invention discloses a formula and a method for commonly treating wet-method smelting slag and coal-series solid wastes. The formula is prepared from the following components in percentage by mass: 50 percent to 75 percent of the wet-method smelting slag and 25 percent to 50 percent of the coal-series solid wastes; the coal-series solid wastes comprise fly ash or coal gangues. The method comprises the following steps: (1) after dehydrating and drying the wet-method smelting slag, crushing and sieving; after crushing the coal-series solid wastes, sieving; (2) mixing the sieved wet-method smelting slag and the sieved coal-series solid wastes according to a ratio to obtain a mixture; carrying out high-temperature melting on the obtained mixture to obtain a vitrified product. In the view of simplicity and feasibility and universality, the wet-method smelting slag, the coal gangues or the fly ash is directly used for carrying out common treatment and pure chemical substances are not additionally added; wastes are treated by wastes and a plurality of types of the wastes are cooperatively treated; the harmlessness of the wet-method smelting slag and the coal gangues is realized through a vitrification manner.

Yang Yuqiang

Papers

Improving production of volatile fatty acids from food waste fermentation by hydrothermal pretreatment

Coupled two-phase anaerobic kitchen garbage strengthening treatment method combining microbial electrolysis cell and microbial cell and device

Kitchen waste aerobic fermentation treatment process based on regulation and control of moisture forms

Vitrified formula of wet process smelt slag and vitrified innocent treatment process

Formula and method for commonly treating wet-method smelting slag and coal-series solid waste