Biohydrogen and polyhydroxyalkanoates (PHA) as products of a two-steps bioprocess from deproteinized dairy wastes

Colombo, Bianca; Calvo, Mariana Villegas; Sciarria, Tommy Pepè; Scaglia, Barbara; Kizito, Simon; D’Imporzano, Giuliana; Adani, Fabrizio

doi:10.1016/j.wasman.2019.05.052

Cited by 81 publications

(28 citation statements)

References 42 publications

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“…This was especially evident in the case of OLR-III which showed the lowest values (0.44 ± 0.1 mg COD PHA mg -1 COD VFA IN), which could be linked to the greater presence of propionate in the medium fed, leading to a possible inactivation of the TCA cycle, as previously mentioned (Jiang et al, 2011). When referring PHA yields to VFA and COD consumed, higher values were obtained (Table 4), indicating that nearly the totality (>90 %) of carbon sources consumed were converted to PHA, confirming that VFAs were the preferred substrate to be metabolized for the production of PHA, in agreement with previous reports (Colombo et al, 2019).…”

Section: Vfa Yields and Characterizationsupporting

confidence: 91%

“…The biomass behavior showed a certain stability as indicated by the low feast/cycle time ratio during the whole SBR run, with a maximum of 0.22 h h -1 . Famine length observed in this study was in the range of 10-11 h, in agreement with previous reports(Colombo et al, 2019).…”

supporting

confidence: 93%

“…For the enrichment of PHA accumulating bacteria at the selection stage, the ammonia was stripped out of the digestate in order to keep the C:N ratio between 8-10, then dilution was made to a final COD of about 40 mmole L -1 COD. For the next step of PHA accumulation, the ammonia in the substrates was further stripped out, before dilution to 200 mmole L -1 COD, as N starvation was required for a greater C conversion to PHA (Colombo et al, 2019). In the following fed-batch PHA accumulation tests, the selected/enriched consortium was evaluated for PHA-storing efficiency during an experimental trial that employed a 0.2 L working volume flask with continuous aeration and stirring.…”

Section: Pha Culture Selection/enrichment and Pha Accumulation Stagementioning

confidence: 99%

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Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

Papa

Sciarria

Carrara

et al. 2020

Bioresource Technology

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A simple biorefinery aimed at producing both biomethane (CH4) and polyhydroxyalkanoates (PHAs), was proposed to valorize the organic fraction of municipal solid waste (OFMSW). Anaerobic digestion (AD) was tested at different organic loading rates (OLR-I-II-III) (i.e. 3, 4 and 6 g L-1 d-1 , respectively), producing biomethane and volatile fatty acids (VFAs)-rich digestate, the VFAs were then used to produce PHAs. Specific biogas and CH4 production remained similar when adopting different OLRs (biogas of 522-600 NL kg-1 VS and CH4 of 64-67% v/v). VFAs concentrated with OLR increases and their patterns were modified. PHA production was in the range of 117-199 g kg-1 OFMSWTS with the lowest production being associated to different polymer composition.

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Section: Vfa Yields and Characterizationsupporting

confidence: 91%

supporting

confidence: 93%

Section: Pha Culture Selection/enrichment and Pha Accumulation Stagementioning

confidence: 99%

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Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

Papa

Sciarria

Carrara

et al. 2020

Bioresource Technology

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“…The biopolymer polyhydroxyalkanoate (PHA) can also be produced from a hydrolysis stage. Its production usually features an acidogenic hydrolyzing step as pretreatment so that fermentable sugars, SCCAs and biogas are available for PHA-producing microbials and higher yields can be reached [98][99][100]. As discussed, control of the metabolism of hydrolytic microorganisms allows the enrichment of different SCCA.…”

Section: Discussionmentioning

confidence: 99%

Role of Microbial Hydrolysis in Anaerobic Digestion

2020

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There is a growing need of substrate flexibility for biobased production of energy and value-added products that allows the application of variable biodegradable residues within a circular economy. It can be used to balance fluctuating energy provision of other renewable sources. Hydrolysis presents one of the biggest limitations during anaerobic digestion. Methods to improve it will result in broader process applicability and improved integration into regional material cycles. Recently, one focus of anaerobic digestion research has been directed to systems with a separate hydrolysis–acidogenesis stage as it might be promised to improve process performance. Conditions can be adjusted to each class of microorganisms individually without harming methanogenic microorganisms. Extensive research of separate biomass pretreatment via biological, chemical, physical or mixed methods has been conducted. Nevertheless, several methods lack economic efficiency, have a high environmental impact or focus on specific substrates. Pretreatment via a separate hydrolysis stage as cell-driven biotransformation in a suspension might be an alternative that enables high yields, flexible feeding and production, and a better process control. In this review, we summarize existing technologies for microbial hydrolytic biotransformation in a separate reactor stage and the impacts of substrate, operational parameters, combined methods and process design as well as remaining challenges.

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“…The production of biohydrogen using dark fermentation of two different cheese deproteinisation diary waste streams SCW (second cheese whey) and CCWP (concentrated cheese whey permeate) was studied by Colombo et al [68]. With an increasing OLR (organic loading rate), H 2 production was seen increasing to 3.47 NL H 2 /d and 5.07 NL H 2 /d for SCW and CCWP, respectively.…”

Section: Dark Fermentationmentioning

confidence: 99%

Critical challenges in biohydrogen production processes from the organic feedstocks

Osman

Deka

Baruah

et al. 2020

Biomass Conv. Bioref.

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The ever-increasing world energy demand drives the need for new and sustainable renewable fuel to mitigate problems associated with greenhouse gas emissions such as climate change. This helps in the development toward decarbonisation. Thus, in recent years, hydrogen has been seen as a promising candidate in global renewable energy agendas, where the production of biohydrogen gains more attention compared with fossil-based hydrogen. In this review, biohydrogen production using organic waste materials through fermentation, biophotolysis, microbial electrolysis cell and gasification are discussed and analysed from a technological perspective. The main focus herein is to summarise and criticise through bibliometric analysis and put forward the guidelines for the potential future routes of biohydrogen production from biomass and especially organic waste materials. This research review claims that substantial efforts currently and, in the future, should focus on biohydrogen production from integrated technology of processes of (i) dark and photofermentation, (ii) microbial electrolysis cell (MEC) and (iii) gasification of combined different biowastes. Furthermore, bibliometric mapping shows that hydrogen production from biomethanol and the modelling process are growing areas in the biohydrogen research that lead to zero-carbon energy soon.

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Biohydrogen and polyhydroxyalkanoates (PHA) as products of a two-steps bioprocess from deproteinized dairy wastes

Cited by 81 publications

References 42 publications

Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

Implementing polyhydroxyalkanoates production to anaerobic digestion of organic fraction of municipal solid waste to diversify products and increase total energy recovery

Role of Microbial Hydrolysis in Anaerobic Digestion

Critical challenges in biohydrogen production processes from the organic feedstocks

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