Assessment of different pre-treatment methods for the removal of limonene in citrus waste and their effect on methane potential and methane production rate

Ruíz, B.; Benito, Amparo; Rivera, José Daniel; Flotats, Xavier

doi:10.1177/0734242x16661053

Cited by 39 publications

(22 citation statements)

References 31 publications

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“…Essential oil, such as patchouli oil, also proved as reduce methane production [108]. Removal of D-limonene has been studied with the aim of improving methane production [106,[109][110][111]. One of the studies applied solvent pretreatment using hexane to reduce the D-limonene content in orange peel.…”

Section: The Substrate-related Issues For Optimum Vfas Productionmentioning

confidence: 99%

Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review

et al. 2019

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Anaerobic digestion (AD) is a well-established technology used for producing biogas or biomethane alongside the slurry used as biofertilizer. However, using a variety of wastes and residuals as substrate and mixed cultures in the bioreactor makes AD as one of the most complicated biochemical processes employing hydrolytic, acidogenic, hydrogen-producing, acetate-forming bacteria as well as acetoclastic and hydrogenoclastic methanogens. Hydrogen and volatile fatty acids (VFAs) including acetic, propionic, isobutyric, butyric, isovaleric, valeric and caproic acid and other carboxylic acids such as succinic and lactic acids are formed as intermediate products. As these acids are important precursors for various industries as mixed or purified chemicals, the AD process can be bioengineered to produce VFAs alongside hydrogen and therefore biogas plants can become biorefineries. The current review paper provides the theory and means to produce and accumulate VFAs and hydrogen, inhibit their conversion to methane and to extract them as the final products. The effects of pretreatment, pH, temperature, hydraulic retention time (HRT), organic loading rate (OLR), chemical methane inhibitions, and heat shocking of the inoculum on VFAs accumulation, hydrogen production, VFAs composition, and the microbial community were discussed. Furthermore, this paper highlights the possible techniques for recovery of VFAs from the fermentation media in order to minimize product inhibition as well as to supply the carboxylates for downstream procedures.

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Section: The Substrate-related Issues For Optimum Vfas Productionmentioning

confidence: 99%

Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review

et al. 2019

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“…In fact, EOs obtained through steam distillation can be easily degraded because of the instability of terpene hydrocarbons. Conversely, Ruiz et al . showed that solvent extraction, compared with steam distillation, was the most efficient method for limonene recovery from orange peel.…”

Section: Introductionmentioning

confidence: 99%

“…Different methods are commonly used for the extraction of EOs, including steam distillation and solvent extraction. Steam distillation is generally used on an industrial scale, especially for d ‐limonene recovery . Unfortunately, besides the low EO removal, the elevated temperature and the long extraction time could modify the volatile molecules .…”

Section: Introductionmentioning

confidence: 99%

“…Steam distillation is generally used on an industrial scale, especially for d ‐limonene recovery . Unfortunately, besides the low EO removal, the elevated temperature and the long extraction time could modify the volatile molecules . In fact, EOs obtained through steam distillation can be easily degraded because of the instability of terpene hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

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Variations of peel essential oils during fruit ripening in four lemon (Citrus limon (L.) Burm. F.) cultivars

et al. 2019

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BACKGROUND: Lemon processing procedures yield a significant amount of waste as peels, which are 57% of processed lemons and represent a possible source of bioactive compounds (essential oils, EOs). EOs were extracted from lemon fruits belonging to four cultivars harvested at four different sampling times (25 October, 23 November, 20 December, 1 February), characterized, and quantified through gas chromatography-mass spectrometry. RESULTS: The chemical composition of EOs highlighted that 26 compounds of the four lemon cultivars at the different ripening stages were clearly identified. The compounds analysed belonged to four chemical classes: monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpenes, and fatty alcohol esters. Among the monoterpene hydrocarbons, D-limonene,-pinene, and -terpinene were the most abundant; and among the oxygenated monoterpenes, -terpineol, nerol, and geraniol were the most abundant. Quantitative gas chromatography-mass spectrometry analysis of the most abundant monoterpene hydrocarbons ( -pinene, -pinene, myrcene, D-limonene, and -terpinene) highlighted that the amount of EOs decreased during ripening stages. 'Ovale di Sorrento' and 'Sfusato Amalfitano' showed the highest level of EOs in December, whereas in 'Femminello Cerza' and 'Femminello Adamo' this occurred in November. EOs, as well as the phenolic compounds, were positively correlated with the antioxidant activity (2,2 ′ -azino-bis(3-ethylbenzothiazoline-6-sulphonic acid). CONCLUSIONS: EOs reached the highest level in the four lemon cultivars at different ripening stages. Campanian cultivars ('Ovale di Sorrento' and 'Sfusato Amalfitano') showed the greatest EO content in November, whereas in Sicilian cultivars ('Femminello Cerza' and 'Femminello Adamo') this occurred in December. Besides phenolic compounds, measured in lemon peel extracts, EOs can contribute to antioxidant activity, as demonstrated by the positive correlation. Composition and quantification of EOs Chemical composition of EOs during ripening stagesThe chemical composition of extracted EOs was analysed during ripening stages (Table 2). A total of 26 compounds were clearly identified in the fruit peel extracts of the four cultivars and at different ripening stages. Significant variations among cultivars and ripening stages were observed.The compounds analysed were assigned to four chemical classes: monoterpene hydrocarbons, oxygenated monoterpenes, sesquiterpenes, and fatty alcohol esters. Monoterpene hydrocarbons were the dominant fraction of EOs, with an average relative abundance of 94.5%. During the ripening they decreased from 95.2% to 93.3%, and among them the compounds represented most were D-

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“…It has a competitive advantage over methanogens for electrons which result in inhibition of methanogenesis. Ruiz et al (2016) evaluated the effect of three different types of pretreatment (biological pretreatment by fungi, steam distillation and ethanol extraction) on biogas production of citrus waste. Limonene removal efficiency of biological pretreatment, steam distillation and ethanol extraction were 22%, 44% and 100%, respectively.…”

mentioning

confidence: 99%

Anaerobic Process

Huang¹,

Mei²,

Li³

et al. 2017

Water Environment Research

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Assessment of different pre-treatment methods for the removal of limonene in citrus waste and their effect on methane potential and methane production rate

Cited by 39 publications

References 31 publications

Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review

Bioengineering of anaerobic digestion for volatile fatty acids, hydrogen or methane production: A critical review

Variations of peel essential oils during fruit ripening in four lemon (Citrus limon (L.) Burm. F.) cultivars

Anaerobic Process

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