Olive mill wastewater biological treatment by fungi biomass

2007 ◽  
Vol 55 (10) ◽  
pp. 89-97 ◽  
Author(s):  
S. Caffaz ◽  
C. Caretti ◽  
M. Morelli ◽  
C. Lubello ◽  
E. Azzari
Keyword(s):  
Phenolic Compounds ◽  
Olive Oil ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Food Industries ◽  
Olive Mill Wastewaters ◽  
Biomass Activity ◽  
The One ◽  
By Products ◽  
Olive Mill

Olive oil extraction is one of the most important traditional food industries in the Mediterranean region, especially in Italy. In addition to olive oil, this industry produces by-products, in particular olive mill wastewaters (OMWs) and olive husks, which represent a serious environmental problem. OMWs can be rarely treated in a municipal WWTP, using conventional wastewater treatments. A novel biological process has to be considered in order to treat OMWs. Literature data show that yeasts and different kinds of fungi are able to reduce both the organic and the phenolic content of the OMW. The present work is aimed at investigating the growth of a biomass rich in fungi in a batch reactor filled with OMW and its capacity to degrade the organic and phenolic load. The aerobic OMW degradation obtained using this biomass reached a COD and TP removal efficiency of 86 and 70%, respectively. Respirometric tests have been carried out in order to measure the biomass activity on different substrates: OMW and phenolic compounds (gallic and p-coumaric acids). The polyphenolic biodegradation efficiency of fungi biomass was higher than the one of a non-acclimated activated sludge biomass. Fungi biomass was able to completely degrade pure phenolic compounds.

Olive mill wastewater treatment: an experimental study

2006 ◽  
Vol 54 (8) ◽  
pp. 17-25 ◽  
Author(s):  
E. Bettazzi ◽  
M. Morelli ◽  
S. Caffaz ◽  
C. Caretti ◽  
E. Azzari ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Organic Load ◽  
Toxic Substances ◽  
Mediterranean Countries ◽  
Three Phase ◽  
Olive Mill Wastewaters ◽  
Biological Treatability ◽  
Olive Mill

Olive oil production, one of the main agro-industries in Mediterranean countries, generates significant amounts of olive mill wastewaters (OMWs), which represent a serious environmental problem, because of their high organic load, the acidic pH and the presence of recalcitrant and toxic substances such as phenolic and lipidic compounds (up to several grams per litre). In Italy, traditional disposal on the soil is the most common way to discharge OMWs. This work is aimed at investigating the efficiency and feasibility of AOPs and biological processes for OMW treatment. Trials have been carried out on wastewaters taken from one of the largest three-phase mills of Italy, located in Quarrata (Tuscany), as well as on synthetic solutions. Ozone and Fenton's reagents applied both on OMWs and on phenolic synthetic solutions guaranteed polyphenol removal efficiency up to 95%. Aerobic biological treatment was performed in a batch reactor filled with raw OMWs (pH =4.5, T=30 °C) without biomass inoculum. A biomass rich of fungi, developed after about 30 days, was able to biodegrade phenolic compounds reaching a removal efficiency of 70%. Pretreatment of OMWs by means of oxidation increased their biological treatability.

scholarly journals Olive Mill Wastewater as Renewable Raw Materials to Generate High Added-Value Ingredients for Agro-Food Industries

2021 ◽  
Vol 11 (16) ◽  
pp. 7511
Author(s):  
Paola Foti ◽  
Flora V. Romeo ◽  
Nunziatina Russo ◽  
Alessandra Pino ◽  
Amanda Vaccalluzzo ◽  
...  
Keyword(s):  
Olive Oil ◽  
Raw Materials ◽  
Olive Mill Wastewater ◽  
Added Value ◽  
Future Research ◽  
Food Industries ◽  
Functional Additives ◽  
Mediterranean Countries ◽  
By Products ◽  
Olive Mill

Olive oil production represents an agro-industrial activity of vital economic importance for many Mediterranean countries. However, it is associated with the generation of a huge amount of by-products, both in solid and liquid forms, mainly constituted by olive mill wastewater, olive pomace, wood, leaves, and stones. Although for many years olive by-products have only been considered as a relevant environmental issue, in the last decades, numerous studies have deeply described their antioxidant, anti-inflammatory, immunomodulatory, analgesic, antimicrobial, antihypertensive, anticancer, anti-hyperglycemic activities. Therefore, the increasing interest in natural bioactive compounds represents a new challenge for olive mills. Studies have focused on optimizing methods to extract phenols from olive oil by-products for pharmaceutical or cosmetic applications and attempts have been made to describe microorganisms and metabolic activity involved in the treatment of such complex and variable by-products. However, few studies have investigated olive oil by-products in order to produce added-value ingredients and/or preservatives for food industries. This review provides an overview of the prospective of liquid olive oil by-products as a source of high nutritional value compounds to produce new functional additives or ingredients and to explore potential and future research opportunities.

scholarly journals The Valorisation of Olive Mill Wastewater from Slovenian Istria by Fe3O4 Particles to Recover Polyphenolic Compounds for the Chemical Specialties Sector

Molecules ◽  
2021 ◽  
Vol 26 (22) ◽  
pp. 6946
Author(s):  
Kelly Peeters ◽  
Ana Miklavčič Višnjevec ◽  
Esakkiammal Esakkimuthu ◽  
Matthew Schwarzkopf ◽  
Črtomir Tavzes
Keyword(s):  
Phenolic Compounds ◽  
Olive Oil ◽  
Extraction Methods ◽  
High Reactivity ◽  
Polyphenolic Compounds ◽  
Olive Mill Wastewater ◽  
Beneficial Effects ◽  
Two Phases ◽  
By Products ◽  
Olive Mill

Olive oil production using three-phase decanter systems creates olive oil and two by-products: olive mill wastewater (OMWW) and pomace. These by-products contain the highest share of polyphenolic compounds that are known to be associated with beneficial effects on human health. Therefore, they are an attractive source of phenolic compounds for further industrial use in the cosmetic, pharmaceutical and food industries. The use of these phenolics is limited due to difficulties in recovery, high reactivity, complexity of the OMWW matrix and different physiochemical properties of phenolic compounds. This research, focused on OMWW, was performed in two phases. First, different polyphenol extraction methods were compared to obtain the method that yields the highest polyphenol concentration. Twenty-five phenolic compounds and their isomers were determined. Acidifying OMWW, followed by five minutes of ultrasonication, resulted in the highest measured polyphenol content of 27 mg/L. Second, the collection of polyphenolic compounds from OMWW via adsorption on unmodified iron (II, III) oxide particles was investigated. Although low yields were obtained for removed polyphenolic compounds in one removal cycle, the process has a high capability to be repeated.

SBR treatment of olive mill wastewaters: dilution or pre-treatment?

2012 ◽  
Vol 65 (9) ◽  
pp. 1684-1691 ◽  
Author(s):  
G. Farabegoli ◽  
A. Chiavola ◽  
E. Rolle
Keyword(s):  
Biological Process ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Adequate Treatment ◽  
Olive Mill Wastewaters ◽  
Other Substances ◽  
Removal Efficiencies ◽  
Pre Treatment ◽  
Olive Mill ◽  
Gac Adsorption

The olive-oil extraction industry is an economically important activity for many countries of the Mediterranean Sea area, with Spain, Greece and Italy being the major producers. This activity, however, may represent a serious environmental problem due to the discharge of highly polluted effluents, usually referred to as ‘olive mill wastewaters’ (OMWs). They are characterized by high values of chemical oxygen demand (COD) (80–300 g/L), lipids, total polyphenols (TPP), tannins and other substances difficult to degrade. An adequate treatment before discharging is therefore required to reduce the pollutant load. The aim of the present paper was to evaluate performances of a biological process in a sequencing batch reactor (SBR) fed with pre-treated OMWs. Pre-treatment consisted of a combined acid cracking (AC) and granular activated carbon (GAC) adsorption process. The efficiency of the system was compared with that of an identical SBR fed with the raw wastewater only diluted. Combined AC and GAC adsorption was chosen to be used prior to the following biological process due to its capability of providing high removal efficiencies of COD and TPP and also appreciable improvement of biodegradability. Comparing results obtained with different influents showed that best performances of the SBR were obtained by feeding it with raw diluted OMWs (dOMWs) and at the lowest dilution ratio (1:25): in this case, the removal efficiencies were 90 and 76%, as average, for COD and TPP, respectively. Feeding the SBR with either the pre-treated or the raw dOMWs at 1:50 gave very similar values of COD reduction (74%); however, an improvement of the TPP removal was observed in the former case.

scholarly journals Biogas Potential of the Side Streams Obtained in a Novel Phenolic Extraction System from Olive Mill Solid Waste

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5438
Author(s):  
África Fernández-Prior ◽  
Ángeles Trujillo-Reyes ◽  
Antonio Serrano ◽  
Guillermo Rodríguez-Gutiérrez ◽  
Claudio Reinhard ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Phenolic Compounds ◽  
Olive Oil ◽  
Solid Waste ◽  
Suspended Solids ◽  
Extraction Process ◽  
Methane Yield ◽  
Yield Coefficient ◽  
Olive Mill Solid Waste ◽  
Olive Mill

The olive oil production is an important industrial sector in many Mediterranean areas, but it is currently struggled by the necessity of a proper valorisation of the olive mill solid waste or alperujo. The alperujo is the main by-product generated during the two-phase olive oil extraction, accounting for up to 80% of the initial olive mass. The alperujo is a source of valuable compounds, such as the pomace olive oil or highly interesting phenolic compounds. In the present research, a novel biorefinery approach has been used for phenolic compounds recovery. However, the extraction of these valuables compounds generates different exhausted phases with high organic matter content that are required to be managed. This study consists of the evaluation of the anaerobic biodegradability of the different fractions obtained in a novel biorefinery approach for the integral valorisation of alperujo. The results show that the different phases obtained during the biorefinery of the alperujo can be effectively subjected to anaerobic digestion and no inhibition processes were detected. The highest methane yield coefficients were obtained for the phases obtained after a two-months storages, i.e., suspended solids and liquid phase free of suspended solids, which generated 366 ± 7 mL CH4/g VS and 358 ± 6 mL CH4/g VS, respectively. The phenol extraction process reduced the methane yield coefficient around 25% due to the retention of biodegradable compounds during the extraction process. Regardless of this drop, the anaerobic digestion is a suitable technology for the stabilization of the different generated residual phases, whereas the high market price of the extracted phenols can largely compensate the slight decrease in the methane generation.

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.

Valorisation of agro-industrial by-products, effluents and waste: concept, opportunities and the case of olive mill wastewaters

2009 ◽  
Vol 84 (6) ◽  
pp. 895-900 ◽  
Author(s):  
Federico Federici ◽  
Fabio Fava ◽  
Nicolas Kalogerakis ◽  
Dionissios Mantzavinos
Keyword(s):  
Olive Mill Wastewaters ◽  
By Products ◽  
Olive Mill

scholarly journals Industrial-Scale Study of the Chemical Composition of Olive Oil Process-Derived Matrices

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 701
Author(s):  
Haifa Jebabli ◽  
Houda Nsir ◽  
Amani Taamalli ◽  
Ibrahim Abu-Reidah ◽  
Francisco Javier Álvarez-Martínez ◽  
...  
Keyword(s):  
Olive Oil ◽  
Industrial Process ◽  
Extraction Process ◽  
Quality Indices ◽  
Total Polyphenols ◽  
Before And After ◽  
Remarkable Result ◽  
Wastewater Samples ◽  
By Products ◽  
Olive Mill

The effect of the industrial process and collecting period on produced olive oil and by-products was evaluated. Obtained results showed significant variations for the majority of quality indices before and after vertical centrifugation between all samples from the three collecting periods. All samples were rich in monounsaturated fatty acid: Oleic acid (C18:1) with a maximum of 69.95%. The total polyphenols and individual phenolic compounds varied significantly through the extraction process, with a significant variation between olive oil and by-products. Notably, the percentage of secoiridoids and their derivatives was significant in paste and olive oil, highlighting the activity of many enzymes released during the different extraction steps. Regarding antioxidant capacity, the most remarkable result was detected in olive oil and olive mill wastewater samples.

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