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.

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.

Influence of physico-chemical treatment on the subsequent biological process treating paper industry wastewater

2012 ◽  
Vol 66 (1) ◽  
pp. 217-223 ◽  
Author(s):  
Mouhamed el khames Saad ◽  
Younes Moussaoui ◽  
Asma Zaghbani ◽  
Imen Mosrati ◽  
Elimame Elaloui ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Chemical Treatment ◽  
Biological Treatment ◽  
Biological Process ◽  
Paper Industry ◽  
Oxygen Demand ◽  
Physico Chemical ◽  
Biodegradation Study ◽  
Pre Treatment ◽  
Industry Wastewater

The present paper presents the main results of the biodegradation study of paper industry wastewater through physico-chemical treatment. Indeed, around 60% of chemical oxygen demand (COD) removal can be achieved by electroflocculation treatment. Furthermore, a removal efficiency of the COD of almost 91% has been obtained by biological treatment, with activated amount of sludge for 24 h of culture. Concerning the physico-chemical pre-treatment of the untreated, filtered and electroflocculated rejection effluents, it has been investigated through the degradation curve of COD studies.

scholarly journals Use of Olive Mill Wastewaters as Bio-Insecticides for the Control of Potosia Opaca in Date Palm (Phoenix dactylifera L.)

2020 ◽  
Author(s):  
Abdelilah Meddich ◽  
Abderrahim Boutasknit ◽  
Mohamed Anli ◽  
Meriame Ait Ahmed ◽  
Abdelilah El Abbassi ◽  
...  
Keyword(s):  
Date Palm ◽  
Phenolic Content ◽  
Negative Impact ◽  
Phoenix Dactylifera ◽  
The North ◽  
Palm Trees ◽  
Phoenix Dactylifera L ◽  
Olive Mill Wastewaters ◽  
Pre Treatment ◽  
Olive Mill

The date palm is one of the most economically important perennial plants of the North Africa and in Morocco, where it is extensively cultivated for food and many other commercial purposes. Palm trees are threatened by many pests such as Potosia opaca newly identified in Morocco, especially in Marrakesh and Errachidia regions. In addition, olive mill wastewaters (OMW) are an environmental problem in olive oil producing countries such as Morocco. Generally, these effluents are drained into ecosystems without any pre-treatment. To reduce their negative impact and to get benefits in particular from their high phenolic content, OMW were used as bio-insecticides in crude form. The results showed that crude OMW were effective to control this pest causing a weight loss similar to Cordus insecticide (17% vs. 15%) and mortality almost similar to Kemaban insecticide. OMW’s biocide potential was related principally to their high phenolic content. Based on HPLC analysis, ten phenolic molecules were identified, including two which were revealed as the major monomeric phenolic compounds in OMW, 0.248 g/L of hydroxytyrosol and 0.201 g/L of tyrosol. In this chapter, the potential use of OMW as bio-insecticides for the control of P. opaca in date palm is discussed.

Pilot-plant results of the electro-Fenton treatment of olive mill wastewaters followed by anaerobic digestion

2007 ◽  
Vol 55 (12) ◽  
pp. 259-265 ◽  
Author(s):  
S. Khoufi ◽  
F. Feki ◽  
F. Aloui ◽  
S. Sayadi
Keyword(s):  
Anaerobic Digestion ◽  
High Energy ◽  
Water Recovery ◽  
Combined Process ◽  
Integrated Technology ◽  
Mediterranean Countries ◽  
Olive Mill Wastewaters ◽  
Pre Treatment ◽  
Treatment Step ◽  
Olive Mill

In this work, we investigated an integrated technology for the treatment of the recalcitrant contaminants of olive mill wastewaters (OMW), allowing water recovery and reuse for agricultural purposes. The method involves an electrochemical pre-treatment step of the wastewater using the electro-Fenton reaction followed by an anaerobic bio-treatment. The electro-Fenton pre-treatment process removed 66% of the total polyphenolic compounds and subsequently decreased the OMW toxicity from 100 to 66.9% which resulted in improving the performance of the anaerobic digestion. A continuous lab-scale methanogenic reactor was operated at a loading rate of 10 g COD/L day without any apparent toxicity. Furthermore, in the combined process, a high overall reduction in COD, suspended solids, polyphenols and lipids content was achieved by the two successive stages. Moreover, this combined process which was experimented at a real scale (25 m3 digester), demonstrated its technical feasibility and opens promising perspectives for industrial application in the Mediterranean countries due to its easy conception and its high energy (methane) production.

Pilot-plant results of the electro-Fenton treatment of olive mill wastewaters followed by anaerobic digestion

2007 ◽  
Vol 55 (12) ◽  
pp. 67-73 ◽  
Author(s):  
S. Khoufi ◽  
F. Feki ◽  
F. Aloui ◽  
S. Sayadi
Keyword(s):  
Anaerobic Digestion ◽  
High Energy ◽  
Water Recovery ◽  
Combined Process ◽  
Integrated Technology ◽  
Mediterranean Countries ◽  
Olive Mill Wastewaters ◽  
Pre Treatment ◽  
Treatment Step ◽  
Olive Mill

In this work, we investigated an integrated technology for the treatment of the recalcitrant contaminants of olive mill wastewaters (OMW), allowing water recovery and reuse for agricultural purposes. The method involves an electrochemical pre-treatment step of the wastewater using the electro-Fenton reaction followed by an anaerobic bio-treatment. The electro-Fenton pre-treatment process removed 66% of the total polyphenolic compounds and subsequently decreased the OMW toxicity from 100 to 66.9%, which resulted in improving the performance of the anaerobic digestion. A continuous laboratory-scale methanogenic reactor was operated at a loading rate of 10 g COD/L per day without any apparent toxicity. Furthermore, in the combined process, a high overall reduction in COD, suspended solids, polyphenols and lipids content was achieved by the two successive stages. Moreover, this combined process which was experimented at a real scale (25 m3 digester) demonstrated its technical feasibility and opens promising perspectives for industrial application in the Mediterranean countries because of its easy conception and high energy (methane) production.

Ozone pretreatment of olive mill wastewaters (OMW) and its effect on OMW biochemical methane potential (BMP)

2013 ◽  
Vol 68 (12) ◽  
pp. 2712-2717 ◽  
Author(s):  
E. Tsintavi ◽  
N. Pontillo ◽  
M. A. Dareioti ◽  
M. Kornaros
Keyword(s):  
Oxygen Demand ◽  
Biochemical Methane Potential ◽  
Experimental Conditions ◽  
Olive Mill Wastewaters ◽  
Ozone Pretreatment ◽  
Methane Potential ◽  
Total Carbohydrates ◽  
Reactor Temperature ◽  
Glass Bubble ◽  
Olive Mill

The possibility of coupling a physicochemical pretreatment (ozonation) with a biological treatment (anaerobic digestion) was investigated for the case of olive mill wastewaters (OMW). Batch ozonation experiments were performed in a glass bubble reactor. The parameters which were tested included the ozone concentration in the inlet gas stream, the reactor temperature and the composition of the liquid medium in terms of raw or fractionated OMW used. In the sequel, ozone-pretreated OMW samples were tested for their biochemical methane potential (BMP) under mesophilic conditions and these results were compared to the BMP of untreated OMW. The ozonation process alone resulted in a 57–76% decrease of total phenols and a 5–18% decrease of total carbohydrates contained in OMW, depending on the experimental conditions. Nevertheless, the ozone-pretreated OMW exhibited lower chemical oxygen demand removal and methane production during BMP testing compared to the untreated OMW.

scholarly journals Sequencing batch reactor process for the removal of nitrogen from anaerobically treated domestic wastewater

2018 ◽  
Vol 77 (6) ◽  
pp. 1581-1590 ◽  
Author(s):  
L. Pelaz ◽  
A. Gómez ◽  
A. Letona ◽  
G. Garralón ◽  
M. Fdz-Polanco
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Anaerobic Treatment ◽  
Cycle Times ◽  
Working Volume ◽  
Nitrogen Ratio ◽  
Pre Treatment ◽  
Kjeldahl Nitrogen

Abstract This work presents the performance of a sequencing batch reactor (SBR) system used as a means of removing nitrogen from domestic wastewater containing a low chemical oxygen demand (COD) to nitrogen ratio due to pre-treatment with an anaerobic reactor. The aim of the work was to determine the feasibility of this system for the removal of nitrogen from the domestic wastewater. An SBR with a working volume of 5 L was investigated at different cycle times of 12, 8 and 6 h, at 18 °C. The efficiency of the SBR varied together with the duration of the cycle, where the optimum performance was seen in the 6 h cycle with the anoxic–aerobic–anoxic sequence. Due to the low quantity of organic matter present in the domestic wastewater after the anaerobic treatment, an additional supply of external carbon was necessary before the second anoxic stage. The removal efficiencies obtained were: 98% for total Kjeldahl nitrogen, 84% for total nitrogen and 77% for soluble COD. The reactor was thus shown to be viable, and it was concluded that this process may be successfully applied as a post-treatment for the removal of nitrogen from anaerobically treated domestic wastewater.

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.

scholarly journals Eco-friendly approach for elimination of olive mill wastewaters (OMW) toxicity using cactus prickly pears juice as a coagulant

2020 ◽  
Vol 15 (4) ◽  
pp. 1050-1067
Author(s):  
M. Neffa ◽  
M. Taourirte ◽  
N. Ouazzani ◽  
H. Hanine
Keyword(s):  
Low Cost ◽  
Mixing Time ◽  
Oxygen Demand ◽  
Physicochemical Analysis ◽  
Jar Test ◽  
Coagulation Mechanism ◽  
Olive Mill Wastewaters ◽  
Series Of Experiments ◽  
Prickly Pears ◽  
Olive Mill

Abstract Currently, research focuses on the application of newer biocoagulant products in wastewater treatment. In this study, the performance of cactus juice to clarify Olive Mill Wastewater (OMW) was investigated by using Jar-test experimentation and assessed by physicochemical analysis of the obtained supernatant: turbidity, total suspended solids (TSS), (λ465; λ395) absorbance, polyphenols (pp), chemical oxygen demand (COD) and Fourier-Transform-Infrared spectroscopy (FTIR) on lyophilized sludge. A series of experiments were conducted to estimate the influence of various experimental parameters, such as the amounts of biocoagulants used, time, stirring speed, and pH. The study showed the optimal coagulation conditions were as follows: sample pH10; cactus juice dose, 10% (v/v); rapid mixing time, 30 s at a speed of 150 rp/min. Under these conditions, the overall removals of 74% for COD, 93% for turbidity and 51% for polyphenols were achieved. As referring to the FTIR analysis, the cactus juice of Opuntia spp. operates predominantly through an adsorption interparticle bridging coagulation mechanism. These results are encouraging in the context of developing a low-cost technology and eco-friendly approach for the effective management of OMW.

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