Two-stage biological treatment of olive mill wastewater with whey as co-substrate

Martinez-Garcia, G.; Johnson, Anbu Clemensis; Bachmann, Robert Thomas; Williams, Colin H.; Burgoyne, Andrea; Edyvean, R.G.J.

doi:10.1016/j.ibiod.2007.03.008

Cited by 59 publications

(16 citation statements)

References 25 publications

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“…This is probably owing to the elevated phenolic content, which can exert an inhibitory effect on the fungi [12,19]. Indeed, the G. candidum growth and the decolorization proved possible in diluted OMW supplemented with nitrogen source (such as ammonium sulfate, ammonium nitrate) as investigated by Asses et al [5,6] and by Fadil et al [12].…”

Section: Discussionmentioning

confidence: 98%

“…In a recent study, it was shown that decolorization and the total phenolic reduction of OMW by lactic bacteria Lactobacillus paracasei was improved by CW addition [7]. Martinez-Garcia et al [19] also used CW as a co-substrate for the aerobic pretreatment of OMW by the yeast Candida tropicalis followed by anaerobic co-digestion. Anaerobic co-digestion of OMW has also been investigated with abattoir wastewaters [13] leading to a simultaneous enhancement of biogas production and bioremediation of effluents.…”

Section: Discussionmentioning

confidence: 99%

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Use of cheese whey to enhance Geotrichum candidum biomass production in olive mill wastewater

Aouidi

Khelifi

Asses

et al. 2010

J Ind Microbiol Biotechnol

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Geotrichum candidum is a yeast-like filamentous fungus that has attracted industrial interest. The present work investigated G. candidum biomass production in agro-industrial wastewaters (olive mill wastewater (OMW) and cheese whey (CW)) as the only substrate. Different solid media (Sabouraud dextrose agar (SDA), CW, OMW, and OMW/CW mixtures in different proportions) were tested. OMW/CW mixtures proved to be suitable for optimal mycelia growth of G. candidum with a very high hyphae density. The highest fungal and expansion rate growth of 83 +/- 1 mm and 12.4 day(-1), respectively, were obtained on a 20:80 mixture of OMW/CW, which was incubated for 7 days. This optimal mixture was used to study the biomass production and the OMW decolorization ability of G. candidum in the presence of CW in liquid medium. Liquid cultures were also conducted in OMW and CW separately. After 5 days of incubation, fungal biomass reached 9.26 g l(-1) in the OMW/CW mixture and only 2.83 g l(-1) in CW, while no biomass production was observed in OMW alone. OMW decolorization and dephenolization by G. candidum also improved in the presence of CW with a decolorization efficiency of 54.5% and a total phenolic reduction of 55.3%, compared with the control which yielded values of about 10% and 15%, respectively. These results suggested that OMW/CW--as the only substrate--could be used as a cost-effective medium to produce G. candidum biomass, without the need for water dilution or supplementation with other nutriments.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Use of cheese whey to enhance Geotrichum candidum biomass production in olive mill wastewater

Aouidi

Khelifi

Asses

et al. 2010

J Ind Microbiol Biotechnol

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“…In other studies, anaerobic digestion after pretreatment with A. niger removed over 60% of COD and resulted in high methane yields (Hamdi et al, 1992;Hamdi and Ellouz, 1993). Similarly, studies using A. terreus have demonstrated that aerobic pre-treatment greatly reduced the concentration of phenolics and significantly increased methane production (up to 23%, Borja, 1995a;Martinez-Garcia et al, 2007) used the yeast C. tropicalis to aerobically pretreated OMW prior to anaerobic digestion. The combined system resulted in a 93% reduction in COD and degradation of 54% of the phenolic content of the OMW.…”

Section: Introductionmentioning

confidence: 93%

Anaerobic digestion of olive mill wastewater

Stamatelatou¹,

Kornaros

Lyberatos

2013

Issue 3

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Anaerobic digestion of olive-mill wastewater (OMW) was carried out in a continuously fed mode bioreactor. The bioreactor was operated at different hydraulic retention times (HRTs), using OMW, either raw or pre-treated with white-rot fungi. Two different kinds of feed were tested in this process, one which was thermally treated and subjected to sedimentation, in order to remove the solids contained and the other without any physicochemical treatment (raw OMW). Thermally pretreated OMW did not allow a stable operation even at an HRT of 30d. Further pretreatment of the OMW with a white-rot fungus for removal of the contained phenolics, allowed a stable operation at an HRT of 30 d. On the other hand, simple dilution of the raw wastewater, without any solids removal, lead to a stable operation at an HRT of 30d and was accompanied by higher production of biogas. The presence of the solids in the OMW proved to be a determining factor for the stability of the process and could be attributed to a possible adsorption on the solids of hydrophobic compounds, such as long-chain fatty acids that are toxic to methanogens.

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“…Do oczyszczania tego typu ście-ków stosowane są procesy biologiczne [3] prowadzone w warunkach tlenowych [8, 9, 10,] lub beztlenowych [2,7]. Największe zastosowanie mają jednak układy dwustopniowe beztlenowe lub beztlenowo -tlenowe [11,12]. Zatem istnieje potrzeba oceny w jakim stopniu związki organiczne zawarte w ściekach z produkcji olejów jadalnych i margaryny ulegają przemianom podczas procesów biochemicznych.…”

Section: Wstępunclassified

Analysis of Organic Matter Transformations During Wastewater Anaerobic Treatment From Production of Edible Fats

Przywara¹

2015

Inż. Ekolog.

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STRESZCZENIEW artykule analizowano przemiany materii organicznej podczas beztlenowego oczyszczania ścieków z produkcji olejów i tłuszczów pochodzenia roślinnego. W artykule opisano charakterystykę zanieczyszczeń organicznych, uwzględniającą ich podział na związki biodegradowalne oraz nie podatne na biologiczny rozkład. W celu dokonania oznaczeń fizykochemicznych zastały pobrane próbki ścieków nieoczyszczonych (przemysłowych) oraz ście-ków oczyszczonych. Metodyka oznaczeń frakcji ChZT została opracowana na podstawie wytycznych ATV-131. Efektem beztlenowego oczyszczania ścieków tłuszczowych było obniżenie udziału substancji biodegradowalnych z 64,1% do 44,2% i wzrost udziału związków niebiodegradowlnych z 35,9% do 55,8%.Słowa kluczowe: ścieki z produkcji tłuszczów jadalnych, frakcje ChZT, substancje organiczne biodegradowalne. ANALYSIS OF ORGANIC MATTER TRANSFORMATIONS DURING WASTEWATER ANAEROBIC TREATMENT FROM PRODUCTION OF EDIBLE FATS ABSTRACTIn this paper, transformations of organic matter during anaerobic treatment of wastewater from the production of edible fats were analyzed. The paper describes a method for characterization of organic pollutants, taking into account their division into biodegradable compounds and not susceptible to biological degradation. In order to make physicochemical determinations, the following types of wastewater samples were collected: non-treated and treated. Methodology for COD fractions determination was developed on the basis of the guidelines ATV-131. The effect of anaerobic treatment of wastewater from production of edible fats was to decrease the proportion of biodegradable compounds from 64.1% to 44.2% and increase the proportion of non-biodegradable compounds from 35.9% to 55.8%.

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Two-stage biological treatment of olive mill wastewater with whey as co-substrate

Cited by 59 publications

References 25 publications

Use of cheese whey to enhance Geotrichum candidum biomass production in olive mill wastewater

Use of cheese whey to enhance Geotrichum candidum biomass production in olive mill wastewater

Anaerobic digestion of olive mill wastewater

Analysis of Organic Matter Transformations During Wastewater Anaerobic Treatment From Production of Edible Fats

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