Effect of thermal hydrolysis pretreatment on volatile fatty acids production in sludge acidification and subsequent polyhydroxyalkanoates production

Zhang, Dandan; Jiang, Houlin; Chang, Jing‐Song; Sun, Jiao; Tu, Weiming; Wang, Hui

doi:10.1016/j.biortech.2019.01.077

Cited by 104 publications

(34 citation statements)

References 34 publications

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“…They reported that the optimum temperature for acidification is the thermophilic zone, which shows 115% and 12% more efficiency than mesophilic, and extreme thermophilic zone respectively. Later, Zhang et al [132] found similar results of increased acidification of about 15.7% due to higher temperature (55 • C) in semi-continuous reactors compared with 35 • C operating temperature.…”

Section: Future Research Needs and Concluding Remarksmentioning

confidence: 74%

Influence of Pre-Hydrolysis on Sewage Treatment in an Up-Flow Anaerobic Sludge BLANKET (UASB) Reactor: A Review

Rajagopal

Choudhury

Anwar

et al. 2019

Water

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The up-flow anaerobic sludge blanket (UASB) process has emerged as a promising high-rate anaerobic digestion technology for the treatment of low- to high-strength soluble and complex wastewaters. Sewage, a complex wastewater, contains 30–70% particulate chemical oxygen demand (CODP). These particulate organics degrade at a slower rate than the soluble organics found in sewage. Accumulation of non-degraded suspended solids can lead to a reduction of active biomass in the reactor and hence a deterioration in its performance in terms of acid accumulation and poor biogas production. Hydrolysis of the CODP in sewage prior to UASB reactor will ensure an increased organic loading rate and better UASB performance. While single-stage UASB reactors have been studied extensively, the two-phase full-scale treatment approach (i.e., a hydrolysis unit followed by an UASB reactor) has still not yet been commercialized worldwide. The concept of treating sewage containing particulate organics via a two-phase approach involves first hydrolyzing and acidifying the volatile suspended solids without losing carbon (as methane) in the first reactor and then treating the soluble sewage in the UASB reactor. This work reviews the available literature to outline critical findings related to the treatment of sewage with and without hydrolysis before the UASB reactor.

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Section: Future Research Needs and Concluding Remarksmentioning

confidence: 74%

Influence of Pre-Hydrolysis on Sewage Treatment in an Up-Flow Anaerobic Sludge BLANKET (UASB) Reactor: A Review

Rajagopal

Choudhury

Anwar

et al. 2019

Water

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“…Variation in the constituents of VFAs conceivably occurs because of characteristics of the components of the organic complexes existing in biomass waste materials [29]. It has been observed that a higher concentration of even-numbered VFAs (e.g., acetic acid, butyric acid) increases the 3-hydroxybutyrate portion whereas, a higher concentration of odd-numbered VFAs (e.g., propionic acid, valeric acid) results in a higher fraction of 3-hydroxyvalerate in the synthesized PHA [30]. Recently, some investigators have utilized the VFAs generated in hydrogen-producing reactors for PHA production using mixed microbial cultures.…”

Section: Vfas As a Potential And Inexpensive Substrate For Pha Productionmentioning

confidence: 99%

An Overview of Recent Advancements in Microbial Polyhydroxyalkanoates (PHA) Production from Dark Fermentation Acidogenic Effluents: A Path to an Integrated Bio-Refinery

et al. 2021

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Global energy consumption has been increasing in tandem with economic growth motivating researchers to focus on renewable energy sources. Dark fermentative hydrogen synthesis utilizing various biomass resources is a promising, less costly, and less energy-intensive bioprocess relative to other biohydrogen production routes. The generated acidogenic dark fermentative effluent [e.g., volatile fatty acids (VFAs)] has potential as a reliable and sustainable carbon substrate for polyhydroxyalkanoate (PHA) synthesis. PHA, an important alternative to petrochemical based polymers has attracted interest recently, owing to its biodegradability and biocompatibility. This review illustrates methods for the conversion of acidogenic effluents (VFAs), such as acetate, butyrate, propionate, lactate, valerate, and mixtures of VFAs, into the value-added compound PHA. In addition, the review provides a comprehensive update on research progress of VFAs to PHA conversion and related enhancement techniques including optimization of operational parameters, fermentation strategies, and genetic engineering approaches. Finally, potential bottlenecks and future directions for the conversion of VFAs to PHA are outlined. This review offers insights to researchers on an integrated biorefinery route for sustainable and cost-effective bioplastics production.

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“…Pretreatment has been a major argument of research during the past 30 years and the AD improvement in terms of increased solubilization and H 2 /CH 4 yields are well established, in particular for sludge (Braguglia et al, 2018;Carrère et al, 2016;Cesaro and Belgiorno, 2020). Very few studies (Kleerbezem et al, 2015;Zhang et al, 2019), aimed for determining the impact of pretreatment on VFAs production potential from FW as proposed here. Mild thermal pretreatment can, in fact, significantly alter both physical and chemical properties of FW, resulting generally in increased solubilization (Pagliaccia et al, 2016(Pagliaccia et al, , 2019Montecchio et al, 2017), in reduced lignocellulosic matrix, and improved digestate hygienization (Ariunbataar et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The selective production of organic acids from various feedstocks is an emerging field of research. Which fermentation products are produced during the fermentation step, under which conditions and by which microorganisms represent open questions receiving increasing attention in recent years, but to our knowledge, only few studies focused the attention on hydrolysis enhancement with feedstock pretreatment, by treating sludge not FW (Morgan-Sagastume et al, 2011;Zhang et al, 2019). Numerous environmental factors determine the product spectrum of mixed culture fermentations, and the microorganisms dominating the system.…”

Section: Introductionmentioning

confidence: 99%

3-Routes Platform for Recovery of High Value Products, Energy and Bio-Fertilizer From Urban Biowaste: The Revenue Project

et al. 2021

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This innovative Biorefinery platform is based on the integration of a mild thermal pre-treatment and a solid/liquid separation unit to parallel-integrated bioprocesses specifically selected on food waste distinctive chemical composition: a liquid fraction, rich in readily fermentable sugars, to be transformed into valuable biobased products, and a solid organic residue to enhance biomethane production generating a fully hygienized digestate to be recycled. The preliminary results in terms of VFAs yields and composition from the acidogenic stage, and the methane conversion rate from the anaerobic digestion of the solid residue, are here presented

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Effect of thermal hydrolysis pretreatment on volatile fatty acids production in sludge acidification and subsequent polyhydroxyalkanoates production

Cited by 104 publications

References 34 publications

Influence of Pre-Hydrolysis on Sewage Treatment in an Up-Flow Anaerobic Sludge BLANKET (UASB) Reactor: A Review

Influence of Pre-Hydrolysis on Sewage Treatment in an Up-Flow Anaerobic Sludge BLANKET (UASB) Reactor: A Review

An Overview of Recent Advancements in Microbial Polyhydroxyalkanoates (PHA) Production from Dark Fermentation Acidogenic Effluents: A Path to an Integrated Bio-Refinery

3-Routes Platform for Recovery of High Value Products, Energy and Bio-Fertilizer From Urban Biowaste: The Revenue Project

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