Removal of peel oil from citrus peel press liquors before anaerobic digestion

Lane, A. G.

doi:10.1080/09593338309384174

Cited by 23 publications

(13 citation statements)

References 1 publication

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“…The progressive increase of EO concentration up to 1400 ppm in tank T 7×12 did not slow down the depuration processes. The tolerance to high EO concentrations in aerated ponds is more than one order of magnitude higher than the 50 ppm of activated sludge plants [1][2][3], due to the EO antimicrobial activity. The increase of the EO tolerance recorded in the pilot plant may be presumably attributed to microbial adaptation to terpenes contained in EO and to the low airflow rate.…”

Section: Discussionmentioning

confidence: 99%

“…The depuration reliability, efficiency and sustainability of activated sludge plants, commonly utilized for depuration of citrus processing wastewater, are negatively conditioned by some characteristics of the wastewater: qualitative and quantitative variability, high acidity, lack of nutrients and high EO content. Biological instability in activated sludge plants has been described when EO concentrations are higher than 50 ppm, due to their antimicrobial activity [1][2][3]. Conversely, biological processes in aerated ponds are much more tolerant of EOs, withstanding concentrations over 20 times higher [4].…”

Section: Introductionmentioning

confidence: 99%

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Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Zema

Andiloro

Bombino

et al. 2012

Environmental Technology

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Citrus processing wastewater was treated in aerated pilot plants in order to evaluate the following: (a) energy efficiency under different air flow rates and times; and (b) limits of spontaneous microflora in adapting to essential oils. In comparison to permanent air flow, night aeration for 12 hours determined an increase of up to 12% of the monthly removal rate of chemical oxygen demand (COD) and a consequent reduction by 10% of energy consumptions per unit of COD removed from 0.63 to 0.57 kWh/kg COD . Lowering night aeration from 14 to 7 l/m 3 /h reduced by only 10% the removal rate of COD; the energy consumption per unit of COD removed (0.32 kWh/kg COD ) was consequently reduced by more than 40%. Dissolved oxygen was maintained at very low level, rarely exceeding 0.2 ppm, with no bad smell. The consequent high oxygen deficit of 98-99% of saturation induced high oxygen transfer efficiency. The microbial population was characterized mainly by aerobic bacteria; only 5-8% of bacteria were strictly anaerobic. In the deep tank layer under the air diffuser a small amount of sludge settled (0.03-0.04 kg of dry matter per kg of COD removed), containing only 3% of total organic matter detected at the end of the depuration process. The fact that the concentration of essential oils could be progressively increased up to 1400 ppm without noticeably slowing down the biological processes demonstrated the remarkable microbial adaptation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Zema

Andiloro

Bombino

et al. 2012

Environmental Technology

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“…Due to the presence of inhibitors such as limonene, the fermentation of these hydrolysates by the yeast Saccharomyces cerevisiae did not give interesting results (53, 54, 70, 98, 105). After removal by filtration, the yeast was shown to ferment well only hexoses such as glucose, fructose and galactose released by enzymatic hydrolysis of the polysaccharides contained in the peel (22), but not pentoses (arabinose and xylose) or galacturonic acid (96).…”

Section: Bioproduction Of Citric Acid From Industrial By-productsmentioning

confidence: 99%

Biotechnological production of citric acid

Max

Salgado

Rodríguez

et al. 2010

Braz. J. Microbiol.

235

142

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This work provides a review about the biotechnological production of citric acid starting from the physicochemical properties and industrial applications, mainly in the food and pharmaceutical sectors. Several factors affecting citric acid fermentation are discussed, including carbon source, nitrogen and phosphate limitations, pH of culture medium, aeration, trace elements and morphology of the fungus. Special attention is paid to the fundamentals of biochemistry and accumulation of citric acid. Technologies employed at industrial scale such as surface or submerged cultures, mainly employing Aspergillus niger, and processes carried out with Yarrowia lipolytica, as well as the technology for recovering the product are also described. Finally, this review summarizes the use of orange peels and other by-products as feedstocks for the bioproduction of citric acid.

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“…Depending on the type of citrus, the orange peel contains approximately 3% limonene. Therefore, it was necessary to separate d-limonene before the cultivation or to protect microorganisms from dlimonene by encapsulation or immobilization [7,8]. Recently, it was reported that Clostridium cellulovorans can degrade orange wastes in the culture including d-limonene and Clostridium beijerinckii can carry out isopropanol-butanol-ethanol (IBE) fermentation, which is a bacterial fermentation process producing isopropanol instead of acetone on acetone-ethanol-butanol (ABE) fermentation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Second-Generation Biomethane from Mandarin Orange Peel under Cocultivation with Methanogens and the Armed Clostridium cellulovorans

Tomita

Tamaru

2019

Fermentation

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This study demonstrates that the consortium, which consists of the microbial flora of methane production (MFMP) and Clostridium cellulovorans grown with cellulose, can perform the direct conversion of cellulosic biomass to methane. The MFMP was taken from a commercial methane fermentation tank and was extremely complicated. Therefore, C. cellulovorans grown with cellobiose could not perform high degradation ability on cellulosic biomass due to competition by various microorganisms in MFMP. Focusing on the fact that C. cellulovorans was cultivated with cellulose, which is armed with cellulosome, so that it is now armed C. cellulovorans; the direct conversion was carried out by the consortium which consisted of MFMP and the armed C. cellulovorans. As a result, the consortium of C. cellulovorans grown with cellobiose and MFMP (CCeM) could not degrade the purified cellulose and mandarin orange peel. However, MFMP and the armed C. cellulovorans reduced 78.4% of the total sugar of the purified cellulose such as MN301, and produced 6.89 mL of methane simultaneously. Furthermore, the consortium consisted of MFMP and the armed C. cellulovorans degraded mandarin orange peel without any pretreatments and produced methane that was accounting for 66.2% of the total produced gas.

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Removal of peel oil from citrus peel press liquors before anaerobic digestion

Cited by 23 publications

References 1 publication

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Depuration in aerated ponds of citrus processing wastewater with a high concentration of essential oils

Biotechnological production of citric acid

The Second-Generation Biomethane from Mandarin Orange Peel under Cocultivation with Methanogens and the Armed Clostridium cellulovorans

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