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.

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.

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 Aloe steudneri gel as natural flocculant for textile wastewater treatment

2018 ◽  
Vol 13 (3) ◽  
pp. 495-504 ◽  
Author(s):  
Amare Tiruneh Adugna ◽  
Nahom Mankir Gebresilasie
Keyword(s):  
Mixing Time ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Physicochemical Characteristics ◽  
Optimum Conditions ◽  
Turbidity Removal ◽  
Jar Test ◽  
Swelling Capacity ◽  
Removal Efficiencies ◽  
Textile Wastewater Treatment

Abstract This study focused on the evaluation of Aloe steudneri gel for textile wastewater clarification with identification of major phytochemical groups and physicochemical characteristics of Aloe steudneri. Optimization of pH, flocculant dose, mixing speed and time were studied for Aloe steudneri gel and synthetic polyacrylamide. A jar test was used to perform the flocculation at optimum conditions (pH 7.3, flocculant dose 33 ml, mixing time 20 minutes and speed 61 rpm). Phytochemical groups like tannins, flavonoids and saponins were identified and the gel showed a good result of 1.9 g H2O/dry polymer for swelling capacity and 6.2 g oil/weight for fat adsorption capacity. At the optimum conditions, the turbidity removal was 92.3% for Aloe steudneri gel and 92.7% for polyacrylamide. Moreover, the removal efficiencies for chemical oxygen demand, 5-day biological oxygen demand, total suspended solids and lead were 76.8%, 83.5%, 57.9% and 77% for Aloe steudneri gel and 78%, 89%, 51% and 72% for polyacrylamide, respectively. Therefore, it is possible to conclude that Aloe steudneri gel can substitute the polyacrylamide as there are no significant differences in their removal efficiencies.

scholarly journals Novel Submerged Photocatalytic Membrane Reactor for Treatment of Olive Mill Wastewaters

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 769 ◽  
Author(s):  
Maria C. Fraga ◽  
Rosa M. Huertas ◽  
João G. Crespo ◽  
Vanessa J. Pereira
Keyword(s):  
Membrane Reactor ◽  
Suspended Solids ◽  
Sol Gel ◽  
Oxygen Demand ◽  
Treatment Technology ◽  
Olive Mill Wastewaters ◽  
Water And Wastewater ◽  
Gel Technique ◽  
Olive Mill ◽  
Photocatalytic Membrane Reactor

A new hybrid photocatalytic membrane reactor that can easily be scaled-up was designed, assembled and used to test photocatalytic membranes developed using the sol–gel technique. Extremely high removals of total suspended solids, chemical oxygen demand, total organic carbon, phenolic and volatile compounds were obtained when the hybrid photocatalytic membrane reactor was used to treat olive mill wastewaters. The submerged photocatalytic membrane reactor proposed and the modified membranes represent a step forward towards the development of new advanced treatment technology able to cope with several water and wastewater contaminants.

scholarly journals Olive Mill Wastewater: From a Pollutant to Green Fuels, Agricultural Water Source, and Bio-Fertilizer. Part 2: Water Recovery

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 768 ◽  
Author(s):  
Patrick Dutournié ◽  
Mejdi Jeguirim ◽  
Besma Khiari ◽  
Mary-Lorène Goddard ◽  
Salah Jellali
Keyword(s):  
Low Cost ◽  
Oxygen Demand ◽  
Water Source ◽  
Water Shortage ◽  
Convective Drying ◽  
Water Yield ◽  
Phase System ◽  
Water Recovery ◽  
Agriculture Sector ◽  
Olive Mill

Water shortage is a very concerning issue in the Mediterranean region, menacing the viability of the agriculture sector and in some countries, population wellbeing. At the same time, liquid effluent volumes generated from agro-food industries in general and olive oil industry in particular, are quite huge. Thus, the main aim of this work is to suggest a sustainable solution for the management of olive mill wastewaters (OMWW) with possible reuse in irrigation. This work is a part of a series of papers valorizing all the outputs of a three-phase system of oil mills. It deals with recovery, by condensation, of water from both OMWW and OMWW-impregnated biomasses (sawdust and wood chips), during a convective drying operation (air velocity: 1 m/s and air temperature: 50 °C). The experimental results showed that the water yield recovery reaches about 95%. The condensate waters have low electrical conductivity and salinities but also acidic pH values and slightly high chemical oxygen demand (COD) values. However, they could be returned suitable for reuse in agriculture after additional low-cost treatment.

scholarly journals Low-Cost Catalysts To Enhance Ozone Action on the Depuration of Olive Mill Wastewaters

2014 ◽  
Vol 53 (40) ◽  
pp. 15357-15368 ◽  
Author(s):  
Rui C. Martins ◽  
Carina M. Ramos ◽  
Rosa M. Quinta-Ferreira
Keyword(s):  
Low Cost ◽  
Olive Mill Wastewaters ◽  
Olive Mill

scholarly journals Treatment of Wastewaters Olive Mill by Electrocoagulation and Biological Process

2017 ◽  
pp. 295-304
Author(s):  
M. Neffa ◽  
H. Hanine ◽  
B. Lekhlif ◽  
M. Taourirt ◽  
K. Habbari
Keyword(s):  
Chemical Oxygen Demand ◽  
Tap Water ◽  
Oxygen Demand ◽  
Olive Mill Wastewater ◽  
Small Scale ◽  
Olive Mill Wastewaters ◽  
Initial Ph ◽  
Environmental Pollution Problem ◽  
High Chemical Oxygen Demand ◽  
Olive Mill

Olive mill wastewaters (OMWW) cause a recurrent environmental pollution problem. Treatment and reuse of olive mill wastewater (OMWW) presents significant challenges both due to the nature of olive oil production (seasonal and small scale) and due to the characteristics of the wastewater (high chemical oxygen demand (COD) and high phenolic content in the organic fraction of OMWW principally responsible for the phytotoxicity and microbial growth inhibitory effects of the effluent). In the present work the combined pretreatment of actual olive mill wastewaters by electrocoagulation and coagulation with natural organic coagulant, such as TNN and Kim 2212, and the biological purification, was investigated. Tests were conducted with raw OMWW and diluted with tap water at pH neuter adjusted by adding lime coagulant with chemical oxygen demand (COD) contents of 178 g d'O2.l-1, total suspended solids (TSS) of 6,4 g/L, Conductivity (mS.cm-1) of 29, pH of 4,8 and turbidity of 50 NTK. The optimum removal of COD, turbidity and total polyphenolic was respectively 38,39 % , 74,45 % and 60%. This results was obtained with TNN coagulation at pH (7) and 20 mg/l of the coagulant . The maximum organic matter removals by electrocoagulation (56.76%) processes was achieved after 90 min, by using 15V/m² voltage kept constant for each run at initial pH of the OMWW (4,4). Olive mill wastewater (OMWW) was then treated aerobically with fungi. The results show that the fungus is capable of reducing chemical oxygen demand 68% and 75% for the diluted OMWW at 50 % treated by lime and lime/KIM 2120 respectively, after only 5 days of growth. Neutral pH seems supported aerobic treatment.

Advanced Treatment of Coking Wastewater by Oxidation Process Using Pyrite and Hydrogen Peroxide

2013 ◽  
Vol 726-731 ◽  
pp. 2521-2525
Author(s):  
Zhi Yong Zhang ◽  
De Li Wu
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidation Process ◽  
Low Cost ◽  
Oxygen Demand ◽  
Utilization Efficiency ◽  
Advanced Treatment ◽  
Coking Wastewater ◽  
Second Stage ◽  
Potential Alternative ◽  
High Utilization

Coking wastewater is a kind of recalcitrant wastewater including complicate compositions. Advanced treatment of coking wastewater by Fenton-Like reaction using pyrite as catalyst was investigated in this paper. The results show that the chemical oxygen demand (COD) of coking wastewater decreased significantly by method of coagulation combined with two-stage oxidation reaction. COD of wastewater can decrease from 250mg/l to 45mg/l after treatment, when 2g/L pyrite was used in each stage oxidation and the dosage of hydrogen peroxide (H2O2) is 0.2ml/l for first stage treatment, 0.1ml/l for second stage treatment respectively. The pyrite is effective to promote Fenton-Like reaction with low cost due to high utilization efficiency of H2O2, moreover, catalyst could be easily recovered and reused. The Fenton-Like reaction might be used as a potential alternative to advanced treatment of recalcitrant wastewater.

scholarly journals Burkholderia thailandensis E264 as a promising safe rhamnolipids’ producer towards a sustainable valorization of grape marcs and olive mill pomace

2021 ◽  
Author(s):  
Alif Chebbi ◽  
Massimiliano Tazzari ◽  
Cristiana Rizzi ◽  
Franco Hernan Gomez Tovar ◽  
Sara Villa ◽  
...  
Keyword(s):  
Energy Source ◽  
Olive Oil ◽  
Low Cost ◽  
Carbon Sources ◽  
Burkholderia Thailandensis ◽  
Rhamnolipid Production ◽  
Key Points ◽  
Wide Range ◽  
Long Chain ◽  
Olive Mill

Abstract Within the circular economy framework, our study aims to assess the rhamnolipid production from winery and olive oil residues as low-cost carbon sources by nonpathogenic strains. After evaluating various agricultural residues from those two sectors, Burkholderia thailandensis E264 was found to use the raw soluble fraction of nonfermented (white) grape marcs (NF), as the sole carbon and energy source, and simultaneously, reducing the surface tension to around 35 mN/m. Interestingly, this strain showed a rhamnolipid production up to 1070 mg/L (13.37 mg/g of NF), with a higher purity, on those grape marcs, predominately Rha-Rha C14-C14, in MSM medium. On olive oil residues, the rhamnolipid yield of using olive mill pomace (OMP) at 2% (w/v) was around 300 mg/L (15 mg/g of OMP) with a similar CMC of 500 mg/L. To the best of our knowledge, our study indicated for the first time that a nonpathogenic bacterium is able to produce long-chain rhamnolipids in MSM medium supplemented with winery residues, as sole carbon and energy source. Key points • Winery and olive oil residues are used for producing long-chain rhamnolipids (RLs). • Both higher RL yields and purity were obtained on nonfermented grape marcs as substrates. • Long-chain RLs revealed stabilities over a wide range of pH, temperatures, and salinities

scholarly journals A Cyanobacteria-Based Biofilm System for Advanced Brewery Wastewater Treatment

2020 ◽  
Vol 11 (1) ◽  
pp. 174
Author(s):  
Konstantinos P. Papadopoulos ◽  
Christina N. Economou ◽  
Athanasia G. Tekerlekopoulou ◽  
Dimitris V. Vayenas
Keyword(s):  
Wastewater Treatment ◽  
Biomass Production ◽  
Low Cost ◽  
Oxygen Demand ◽  
Dry Weight ◽  
Surface Hydrophobicity ◽  
Reactor Performance ◽  
Brewery Wastewater ◽  
Kjeldahl Nitrogen ◽  
Supporting Materials

Algal/cyanobacterial biofilm photobioreactors provide an alternative technology to conventional photosynthetic systems for wastewater treatment based on high biomass production and easy biomass harvesting at low cost. This study introduces a novel cyanobacteria-based biofilm photobioreactor and assesses its performance in post-treatment of brewery wastewater and biomass production. Two different supporting materials (glass/polyurethane) were tested to investigate the effect of surface hydrophobicity on biomass attachment and overall reactor performance. The reactor exhibited high removal efficiency (over 65%) of the wastewater’s pollutants (chemical oxygen demand, nitrate, nitrite, ammonium, orthophosphate, and total Kjeldahl nitrogen), while biomass per reactor surface reached 13.1 and 12.8 g·m−2 corresponding to 406 and 392 mg·L−1 for glass and polyurethane, respectively, after 15 days of cultivation. The hydrophilic glass surface favored initial biomass adhesion, although eventually both materials yielded complete biomass attachment, highlighting that cell-to-cell interactions are the dominant adhesion mechanism in mature biofilms. It was also found that the biofilm accumulated up to 61% of its dry weight in carbohydrates at the end of cultivation, thus making the produced biomass a suitable feedstock for bioethanol production.

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