Removal of organic load and phenolic compounds from olive mill wastewater by Fenton oxidation with zero-valent iron

2009 ◽  
Vol 150 (2-3) ◽  
pp. 391-395 ◽  
Author(s):  
M. Kallel ◽  
C. Belaid ◽  
T. Mechichi ◽  
M. Ksibi ◽  
B. Elleuch
Keyword(s):  
Phenolic Compounds ◽  
Olive Mill Wastewater ◽  
Fenton Oxidation ◽  
Zero Valent Iron ◽  
Organic Load ◽  
Olive Mill

Application of electro-Fenton oxidation for the detoxification of olive mill wastewater phenolic compounds

2004 ◽  
Vol 49 (4) ◽  
pp. 97-102 ◽  
Author(s):  
S. Khoufi ◽  
H. Aouissaoui ◽  
M. Penninckx ◽  
S. Sayadi
Keyword(s):  
Phenolic Compounds ◽  
Olive Mill Wastewater ◽  
Fenton Oxidation ◽  
Efficient Procedure ◽  
Olive Mill Wastewaters ◽  
Molecular Masses ◽  
Low Mass ◽  
Pre Treatment ◽  
High Concentrations ◽  
Olive Mill

Olive mill wastewaters are powerful pollutants that are difficult to treat as they contain high concentrations of recalcitrant and toxic polyphenolics of different molecular masses. We report in this paper that pre-treatment of phenolic fractions extracted from olive mill wastewaters as well as a synthetic phenolic mixture by the electro-Fenton method is a highly efficient procedure in which low mass phenolics are polymerised to polyphenolics and removed by precipitation. This decreases the toxicity load by 78% and makes the waste amenable to further anaerobic post-treatment.

Olive mill wastewater degradation by Fenton oxidation with zero-valent iron and hydrogen peroxide

2009 ◽  
Vol 163 (2-3) ◽  
pp. 550-554 ◽  
Author(s):  
Monem Kallel ◽  
Chokri Belaid ◽  
Rachdi Boussahel ◽  
Mohamed Ksibi ◽  
Antoine Montiel ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Olive Mill Wastewater ◽  
Fenton Oxidation ◽  
Zero Valent Iron ◽  
Olive Mill

scholarly journals Candida tropicalis as a Promising Oleaginous Yeast for Olive Mill Wastewater Bioconversion

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 640
Author(s):  
Bruna Dias ◽  
Marlene Lopes ◽  
Renata Ramôa ◽  
Ana S. Pereira ◽  
Isabel Belo
Keyword(s):  
Phenolic Compounds ◽  
Candida Tropicalis ◽  
Oxygen Demand ◽  
Olive Mill Wastewater ◽  
Cellular Growth ◽  
Added Value ◽  
Organic Load ◽  
Batch Cultures ◽  
Intracellular Lipids ◽  
Olive Mill

Olive mill wastewater (OMW), which is generated during olive oil production, has detrimental effects on the environment due to its high organic load and phenolic compounds content. OMW is difficult to biodegrade, but represents a valuable resource of nutrients for microbial growth. In this study, yeast strains were screened for their growth on phenolic compounds usually found in OMW and responsible for antimicrobial effects. Candida tropicalis ATCC 750 demonstrated an extraordinary capacity to grow in phenolics and was chosen for further experiments with OMW-based medium. The effects of nitrogen supplementation, the pH, and the stirring rate on cellular growth, OMW-components consumption, and added-value compounds production were studied in batch cultures in Erlenmeyer flasks and in a bioreactor. Candida tropicalis was able to reduce 68% of the organic load (chemical oxygen demand) and 39% of the total phenols of OMW in optimized conditions in bioreactor experiments, producing lipase (203 U·L−1) and protease (1105 U·L−1). Moreover, intracellular lipids were accumulated, most significantly under nitrogen-limited conditions, which is common in this type of wastewater. The high potential of C. tropicalis to detoxify OMW and produce added-value compounds from it makes this process an alternative approach to other conventional processes of OMW treatment.

scholarly journals Structure of Microbial Communities When Complementary Effluents Are Anaerobically Digested

2021 ◽  
Vol 11 (3) ◽  
pp. 1293
Author(s):  
Ana Eusébio ◽  
André Neves ◽  
Isabel Paula Marques
Keyword(s):  
Anaerobic Digestion ◽  
Microbial Communities ◽  
Volatile Fatty Acids ◽  
Olive Mill Wastewater ◽  
Organic Load ◽  
Rrna Gene ◽  
Bacterial Populations ◽  
Next Generation Sequencing Ngs ◽  
Generation Sequencing ◽  
Olive Mill

Olive oil and pig productions are important industries in Portugal that generate large volumes of wastewater with high organic load and toxicity, raising environmental concerns. The principal objective of this study is to energetically valorize these organic effluents—piggery effluent and olive mill wastewater—through the anaerobic digestion to the biogas/methane production, by means of the effluent complementarity concept. Several mixtures of piggery effluent were tested, with an increasing percentage of olive mill wastewater. The best performance was obtained for samples of piggery effluent alone and in admixture with 30% of OMW, which provided the same volume of biogas (0.8 L, 70% CH4), 63/75% COD removal, and 434/489 L CH4/kg SVin, respectively. The validation of the process was assessed by molecular evaluation through Next Generation Sequencing (NGS) of the 16S rRNA gene. The structure of the microbial communities for both samples, throughout the anaerobic process, was characterized by the predominance of bacterial populations belonging to the phylum Firmicutes, mainly Clostridiales, with Bacteroidetes being the subdominant populations. Archaea populations belonging to the genus Methanosarcina became predominant throughout anaerobic digestion, confirming the formation of methane mainly from acetate, in line with the greatest removal of volatile fatty acids (VFAs) in these samples.

Panus tigrinus efficiently removes phenols, color and organic load from olive-mill wastewater

2004 ◽  
Vol 155 (7) ◽  
pp. 596-603 ◽  
Author(s):  
Alessandro D'Annibale ◽  
Marika Ricci ◽  
Daniele Quaratino ◽  
Federico Federici ◽  
Massimiliano Fenice
Keyword(s):  
Olive Mill Wastewater ◽  
Organic Load ◽  
Panus Tigrinus ◽  
Olive Mill

scholarly journals Biodegradation of Olive Mill Wastewater by Trichosporon Cutaneum and Geotrichum Candidum

2010 ◽  
Vol 61 (4) ◽  
pp. 399-405 ◽  
Author(s):  
Tibela Dragičević ◽  
Marijana Hren ◽  
Margareta Gmajnić ◽  
Sanja Pelko ◽  
Dzoko Kungulovski ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Oxygen Demand ◽  
Geotrichum Candidum ◽  
Olive Mill Wastewater ◽  
Trichosporon Cutaneum ◽  
Aerobic Conditions ◽  
Wide Range ◽  
Dark Colour ◽  
Static Conditions ◽  
Olive Mill

Biodegradation of Olive Mill Wastewater by Trichosporon Cutaneum and Geotrichum CandidumOlive oil production generates large volumes of wastewater. These wastewaters are characterised by high chemical oxygen demand (COD), high content of microbial growth-inhibiting compounds such as phenolic compounds and tannins, and dark colour. The aim of this study was to investigate biodegradation of olive mill wastewater (OMW) by yeasts Trichosporon cutaneum and Geotrichum candidum. The yeast Trichosporon cutaneum was used because it has a high potential to biodegrade phenolic compounds and a wide range of toxic compounds. The yeast Geotrichum candidum was used to see how successful it is in biodegrading compounds that give the dark colour to the wastewater. Under aerobic conditions, Trichosporon cutaneum removed 88 % of COD and 64 % of phenolic compounds, while the dark colour remained. Geotrichum candidum grown in static conditions reduced COD and colour further by 77 % and 47 %, respectively. This investigation has shown that Trichosporon cutaneum under aerobic conditions and Geotrichum candidum under facultative anaerobic conditions could be used successfully in a two-step biodegradation process. Further investigation of OMW treatment by selected yeasts should contribute to better understanding of biodegradation and decolourisation and should include ecotoxicological evaluation of the treated OMW.

scholarly journals Enrichment of Phenolic Compounds from Olive Mill Wastewater and In Vitro Evaluation of Their Antimicrobial Activities

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Saleh Abu-Lafi ◽  
Mahmoud Sami Al-Natsheh ◽  
Reem Yaghmoor ◽  
Fuad Al-Rimawi
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Olive Oil ◽  
Acid Value ◽  
Antimicrobial Activities ◽  
Olive Mill Wastewater ◽  
Total Phenolic ◽  
The Stability ◽  
Olive Mill

The production of olive oil generates massive quantities of by-product called olive mill wastewater (OMWW). The uncontrolled disposal of OMWW poses serious environmental problems. The OMWW effluent is rich in several polyphenolic compounds. Liquid-liquid extraction of OMWW using ethyl acetate solvent was used to enrich phenolic compounds under investigation. Total phenolic and flavonoid content and antioxidant activity of the extract were determined. HPLC coupled to photodiode array (PDA) detector was used to analyze the main three phenolic compounds of OMWW, namely, hydroxytyrosol, tyrosol, and oleuropein. The antimicrobial activity of the extract was also investigated. Additionally, the OMWW extract was used as natural preservative and antioxidants for olive oil. Results showed that OMWW is very rich in phenolic compounds and has strong antioxidant activity. HPLC analysis showed that the extract contains mainly hydroxytyrosol and tyrosol but no oleuropein. The OMWW extract showed also positive activities as antibacterial (gram positive and gram negative) and antifungal as well as activities against yeast. The addition of OMWW extract to olive oil samples has an effect on the stability of olive oil as reflected by its acid value, peroxide value, K232 and K270, and total phenolic content.

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