Selective adsorption and recovery of volatile fatty acids from fermented landfill leachate by activated carbon process

Talebi, Amir; Razali, Yasmin Syafikah; Ismail, Norli; Rafatullah, Mohd; Tajarudin, Husnul Azan

doi:10.1016/j.scitotenv.2019.134533

Cited by 38 publications

(17 citation statements)

References 33 publications

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“…Variation in the physicochemical properties of AM has revealed that the composition of manure is highly dependent on animal feed [42]. AM typically has a low C/N ratio (9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19), high buffering capacity, and high biodegradability [43,44]. It contains a VS/TS ratio ranging between 0.65 and 0.90 [40,43].…”

Section: Types Of Organic Wastementioning

confidence: 99%

“…Therefore, these fermented streams require a solid removal step to improve the efficiency of the recovery process [14]. Various techniques have been applied for VFA recovery, including liquid-liquid extraction [15], adsorption [16,17], membrane contactors [18], membrane reactors [19,20], electrodialysis [21,22] and membrane pervaporation [13]. Among them, membrane-based recovery appears to be a more promising technology than other techniques because of its economic and environmental potential [5,7,14].…”

Section: Introductionmentioning

confidence: 99%

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Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

2021

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In recent years, interest in the biorefinery concept has emerged in the utilization of volatile fatty acids (VFAs) produced by acidogenic fermentation as precursors for various biotechnological processes. This has attracted substantial attention to VFA production from low-cost substrates such as organic waste and membrane based VFA recovery techniques to achieve cost-effective and environmentally friendly processes. However, there are few reviews which emphasize the acidogenic fermentation of organic waste into VFAs, and VFA recovery. Therefore, this article comprehensively summarizes VFA production, the factors affecting VFA production, and VFA recovery strategies using membrane-based techniques. Additionally, the outlook for future research on VFA production is discussed.

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Section: Types Of Organic Wastementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

2021

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“…Cellulolytic enzymes are generally applied in the paper and pulp industry for the bleaching of paper and pulp [58,59,97,98]. A host of lignocellulose-degrading enzymes are applied in the textile industry [9,20,99,100].…”

Section: Applications Of Cellulolytic Enzymesmentioning

confidence: 99%

“…Despite lignocellulose's promising outlook, its physico-chemically recalcitrant nature and the high processing costs have put a damper on its being used globally [18,19]. Thus, to address this problem, further studies on lignocellulolytic enzymes are vital as they will lead to the sustainable hydrolysis of lignocellulosic biomass [20]. The issue with attempting to increase the use of lignocellulosic waste has been around for decades.…”

Section: Introductionmentioning

confidence: 99%

Lignocellulolytic Enzymes in Biotechnological and Industrial Processes: A Review

et al. 2020

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Tons of anthropological activities contribute daily to the massive amount of lignocellulosic wastes produced annually. Unfortunately, their full potential usually is underutilized, and most of the biomass ends up in landfills. Lignocellulolytic enzymes are vital and central to developing an economical, environmentally friendly, and sustainable biological method for pre-treatment and degradation of lignocellulosic biomass which can lead to the release of essential end products such as enzymes, organic acids, chemicals, feed, and biofuel. Sustainable degradation of lignocellulosic biomass via hydrolysis is achievable by lignocellulolytic enzymes, which can be used in various applications, including but not limited to biofuel production, the textile industry, waste treatment, the food and drink industry, personal care industry, health and pharmaceutical industries. Nevertheless, for this to materialize, feasible steps to overcome the high cost of pre-treatment and lower operational costs such as handling, storage, and transportation of lignocellulose waste need to be deployed. Insight on lignocellulolytic enzymes and how they can be exploited industrially will help develop novel processes that will reduce cost and improve the adoption of biomass, which is more advantageous. This review focuses on lignocellulases, their use in the sustainable conversion of waste biomass to produce valued-end products, and challenges impeding their adoption.

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“…However, the separation of single volatile fatty acids (VFA) from complex effluents such as the fermentation broth remains a challenge, owing to the complex nature and the presence of various organics 6 . Techniques such as electrodialysis, 7 reactive extraction, 8 reverse osmosis, 9 nanofiltration 10 and adsorption 11 have been investigated to separate and concentrate these acids from aqueous solution and fermentation broth. This downstream processing has to be considered carefully to make the hydrolytic process comparable to petrochemical synthesis in terms of commercial feasibility.…”

Section: Introductionmentioning

confidence: 99%

Enhanced production of propionic acid through acidic hydrolysis by choice of inoculum

Ali

Saravia

Hille-Reichel

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: In this study, the enhancement of propionic acid production from a model feedstock mimicking kitchen waste was investigated. For that purpose, two operational runs of a semicontinuous anaerobic hydrolysis reactor were carried out at pH 6.0 ± 0.1 and mesophilic (30°C) temperature. Two different types of inocula, a mixed microbial culture selected over 24 months for growth on cellulose and a culture contained in goat cheese were compared. RESULTS: The results show that the goat cheese inoculum was significantly more efficient for propionic acid (PA) production. The highest propionic acid concentration achieved amounted to 139 mmol L −1 at a yield of 23.3 mg g −1 volatile solids (VS), which was 55% greater than what was achieved with the mixed culture. Furthermore, it was observed that propionic acid production was enhanced by a combination of high hydraulic retention time (HRT) with low organic loading rate (OLR), ensuring sufficient time for complete processing of the complex organic substrates. The fermentation could be kept in a stable process of propionic acid production at HRT of 20 days and a rather low OLR of 11.1 g L −1 day −1 VS. CONCLUSION: Our results give a better understanding of PA production in semicontinuous mode, applying optimized process parameters and selecting the adequate microbial community for inoculation. This study provides important information for the improvement of PA production from complex substrates for future industrial application.

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Selective adsorption and recovery of volatile fatty acids from fermented landfill leachate by activated carbon process

Cited by 38 publications

References 33 publications

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

Volatile Fatty Acid Production from Organic Waste with the Emphasis on Membrane-Based Recovery

Lignocellulolytic Enzymes in Biotechnological and Industrial Processes: A Review

Enhanced production of propionic acid through acidic hydrolysis by choice of inoculum

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