Performance of a two-stage anaerobic digestion system treating fruit pulp waste: The impact of substrate shift and operational conditions

Used disposable nappies and expired food products valorisation through one- & two-stage anaerobic co-digestion

“…Besides energy generation, AD presents other benefits as well, like greenhouse gas mitigation and a stabilized digestate that could be also valorized through composting for soil enhancement (Dogan and Demirer, 2012;Behera et al, 2010). The efficiency of the process depends on various parameters that have been reported in literature, like one-or twostage systems (Nathao et al, 2013;Micolucci et al, 2018), pH Paramaguru et al, 2017), HRT Kornaros, 2014, 2015), pretreatment (Naran et al, 2016), substrate shift (Carvalheira et al, 2018), microbial community and characteristics (Zhao et al, 2018) and co-digestion which is a well-established technology with consistent results in boosting the production of gaseous biofuels (Edwards et al, 2017). One of the advantages of the simultaneous digestion of two or more substrates is that it dilutes toxic compounds that usually inhibit the operation of the bioreactors (Angeriz-Campoy et al, 2015), but also facilitates the anaerobic digestion process by balancing nutrients and reducing the cost of managing each stream separately via equipment sharing.…”

From Food Waste to Volatile Fatty Acids towards a Circular Economy

“…All these features make the FW an interesting renewable source for VFA production. Different types of FW, such as solid waste of cafeteria [13,14], tuna waste [15], fruit pulp waste [1,16], cheese whey [8,17], sugar cane molasses [17], corn stalk [18], potato peel waste [19], FW rich in proteins [20], brewers' spent grain [21], mixture of different fractions of FW [22], FW from canteen [23,24], and vegetable wastes [25] have been used as feedstock in biological processes using mixed microbial cultures. Furthermore, FW can be also mixed with other wastes, like as waste activated sludge [26] and sewage sludge [27] to improve the biological process performance.…”

“…Ethanol can be produced from pyruvate in two or three steps, depending on the type of bacteria, and with acetyl-CoA and acetaldehyde as intermediates [5]. Propionate is produced by two distinct pathways: (1) [5]. For the lactate production, pyruvate is converted to lactate through lactate dehydrogenase and can be divide into two fermentation types: homolactate fermentation (one mole of glucose is converted into two moles of lactic acid) and heterolactate (lactic acid is produced with carbon dioxide and ethanol).…”

“…The increase of industrialization and world population is leading to a huge generation of organic wastes, causing serious environmental problems if disposed without an adequate treatment [1,2]. The conventional waste treatment is mainly focused on environmental regulations, neglecting the resource recovery from wastes streams, which is one of the environmental sustainability goals [2,3].…”

Identification of new critical points for logistics model in cumulative methane yield curves after co‐digestion of apple pulp and chicken manure with sulphuric acid pretreatment and a new modelling study

“…The increase in city‐based population and human consumption has resulted in an increase in the production of the concentrated organic wastes that cause environmental pollution . The anaerobic digestion (AD) process results in the production of biogas energy and digestate as bio‐fertilizers from organic wastes.…”