scholarly journals Parametric Study to Analyze the Performance of a Solar Greenhouse Dryer for the Drying of Olive Mill Wastewater

2021 ◽  
Vol 16 ◽  
pp. 18-22
Author(s):  
Bouraoui Chaima ◽  
Ben Nejma Fayçal
Keyword(s):  
Climatic Conditions ◽  
Olive Mill Wastewater ◽  
Design Parameters ◽  
Comsol Multiphysics ◽  
Drying Process ◽  
Solar Greenhouse ◽  
Drying Efficiency ◽  
Mass Transfers ◽  
Installation Cost ◽  
Olive Mill

The objective of this paper is to improve the design of an even-span greenhouse by analyzing the effect of some climatic and design parameters on its performance of drying Olive Mill wastewater. A mathematical model describing the coupled heat and mass transfers inside the dryer was developed and simulated under different condition using COMSOL Multiphysics. An analysis of the dryer performance was conducted in terms of the obtained overall drying efficiency. The findings indicated that the use of a shallow and large pond dyer under hot climatic conditions can improve significantly the drying process. The dryer high and the extension added to the configuration had not achieved any enhancement to the drying efficiency, but can affect the calculations time and installation cost. The developed model was thus used as an effective tool to optimize the drying process.

scholarly journals Numerical study of the greenhouse solar drying of olive mill wastewater under different conditions

2020 ◽  
Vol 12 (4) ◽  
pp. 168781401988974 ◽  
Author(s):  
Chaima Bouraoui ◽  
Fayçal Ben Nejma
Keyword(s):  
Mass Fraction ◽  
Numerical Study ◽  
Meteorological Conditions ◽  
Olive Mill Wastewater ◽  
Comsol Multiphysics ◽  
Solar Drying ◽  
Drying Process ◽  
After Hours ◽  
Vapor Mass ◽  
Olive Mill

The aim of this work is to develop thermal modeling of the olive mill wastewater drying process in a greenhouse solar dryer. A configuration was thus proposed and simulated using the commercial software COMSOL Multiphysics in order to solve the conservation equations governing our problem. The resulting simulations are used to evaluate the temperature, velocity, and vapor mass fraction distributions after hours of sunshine and to provide a quantification of the drying process. The influence of the greenhouse effect on the drying kinetics is highlighted by comparing to open sun-drying results. The effect of some greenhouse geometric characteristics and external meteorological conditions are studied.

Production of organic fertilizer from olive mill wastewater by combining solar greenhouse drying and composting

2018 ◽  
Vol 75 ◽  
pp. 305-311 ◽  
Author(s):  
F. Galliou ◽  
N. Markakis ◽  
M.S. Fountoulakis ◽  
N. Nikolaidis ◽  
T. Manios
Keyword(s):  
Organic Fertilizer ◽  
Olive Mill Wastewater ◽  
Solar Greenhouse ◽  
Olive Mill

scholarly journals Anaerobic Co-Digestion of Pig and Cow Manure with a Solar Dried Mixture of Food Waste and Olive Mill Wastewater

Proceedings ◽  
2020 ◽  
Vol 30 (1) ◽  
pp. 91
Author(s):  
Nikolaos Papastefanakis ◽  
Chryssa Bouki ◽  
Michail S. Fountoulakis ◽  
Christos Tsompanidis ◽  
Theofanis Lolos ◽  
...  
Keyword(s):  
Food Waste ◽  
Biogas Production ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Olive Mill Wastewater ◽  
Anaerobic Sludge ◽  
Cow Manure ◽  
Drying Process ◽  
Working Volume ◽  
Olive Mill

Biogas production through anaerobic digestion is a well-established practice worldwide combining waste treatment and energy production at the same time. One of the challenges of this technology is to increase the yield of biogas production and secure the disposal of the effluent of anaerobic reactors. It is well known that various organic residues such as cheese whey, olive mill wastewater, as well as food waste from hotel units, could be combined with other materials (animal manures, sewage sludge, etc.) in order to increase biogas production through co-digestion. However, their high seasonal variation and high transport costs is a barrier for their use. Solar drying process can be a very attractive technology for volume reduction in order to decrease the storage and the transportation cost. Moreover using solar energy may well be an alternative solution for reduction of drying process costs. In this study, co-digestion of pig manure (PM) and cow manure (CM) with solar dried mixture of food waste (FW) and olive mill wastewater (OMW), named as biobooster, was studied in an attempt to improve biogas production of existing on—farms plants which co-digest manure with other farm waste. The effect of biobooster in biogas production was investigated using three lab-scale continuous stirred-tank reactors (CSTR) (3 L working volume) (D1–D3) under mesophilic conditions (37 ± 2 °C) with a hydraulic retention time of 20 days. Initially, all reactors were inoculated with anaerobic sludge originating from sewage treatment plant of the city of Heraklion, and contained 19.6 g/L TS, 10.8 g/L VS and 17.5 g/L COD. Three types of influent feedstock were utilized: D1: PM (95%) + CM (5%) (VSin = 33.58 ± 4.51 g/L), D2: PM (95%) + CM (5%) + Biobooster (1%) (VSin = 41.07 ± 7.16 g/L), D3: PM (100%) + Biobooster (1%) (VSin = 8.48 ± 0.87 g/L). The experiments showed that the addition of biobooster to pig and cow manure significantly increased biogas production by nearly 65% as value of 662.75 ± 172.50 mL/l/d compared to that with pig and cow manure alone (402.60 ± 131.89 mL/l/d). The biogas production in D3 reactor was 242.50 ± 56.82 mL/l/d. This work suggests that methane can be improved very efficiently by adding a small portion (20% increase of VS) of dried agro-industrial by-products in the inlet of digesters of existing on—farms plants.

Konsumsi Energi Pada Alat Pengering Surya dan Tipe Bak Untuk Pengeringan Biji Kakao

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Lamhot P. Manalu
Keyword(s):  
Specific Energy ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Solar Irradiation ◽  
Drying Process ◽  
Food Industries ◽  
Solar Dryer ◽  
Agricultural Applications ◽  
Drying System ◽  
Drying Efficiency

Crop drying is essential for preservation in agricultural applications. It is performed either using fossil fuels in an artificial mechanical drying process or by placing the crop under the open sun. The first method is costly and has a negative impact on the environment, while the second method is totally dependent on the weather. The drying process requires a lot of energy in relation to the amount of water that must be evaporated from the product. It is estimated that 12% of the total energy used by the food industries and agriculture absorbed in this process. Due to the limitation of energy resources, it is important to keep researching and developing of diversification and optimization of energy This study aims to assess the use of energy for cocoa drying using solar energy dryer and bin-type dryer, as well as to determine the drying efficiency of each type of dryer. The results showed that the efficiency of the solar dryer drying system ranges between 36% to 46%, while the tub-type dryers between 21.7% to 33.1%. The specific energy of solar dryer ranged from 6.17-7.87 MJ / kg, while the tub-type dryers 8.58-13.63 MJ / kg. Dryer efficiency is influenced by the level of solar irradiation and the amount of drying load, the higher the irradiation received and more cocoa beans are dried, the drying efficiency is also higher and the specific energy further down.Proses pengeringan memerlukan banyak energi sehubungan dengan banyaknya air yang harus diuapkan dari bahan yang dikeringkan. Pengeringan dapat dilakukan dengan menggunakan pengering mekanis berbahan bakar fosil atau dengan menempatkan produk di bawah matahari terbuka. Metode pertama adalah mahal dan memiliki dampak negatif pada lingkungan, sedangkan metode kedua sangat tergantung pada cuaca. Diperkirakan bahwa 12% dari total energi yang dipergunakan oleh industri pangan dan pertanian diserap untuk proses ini. Mengingat semakin terbatasnya sumber energi bahan bakar minyak maka usaha diversifikasi dan optimasi energi untuk pengeringan perlu terus diteliti dan dikembangkan. Salah satunya adalah pemanfaatan energi surya sebagai sumber energi terbarukan. Penelitian ini bertujuan untuk mengkaji penggunaan energi untuk pengeringan kakao dengan memakai pengering energi surya dan pengering tipe bak, serta untuk mengetahui efisiensi pengeringan dari masing-masing tipe pengering. Hasil kajian menunjukkan bahwa efisiensi total sistem pengeringan alat pengering surya berkisar antara 36% dan 46%, sedangkan pengering tipe bak antara 21.7% dan 33.1%. Kebutuhan energi spesifik alat pengering surya berkisar antara 6.17-7.87 MJ/kg, sedangkan alat pengering tipe bak 8.58-13.63 MJ/kg. Efisiensi alat pengering dipengaruhi oleh tingkat iradiasi surya dan jumlah beban pengeringan, semakin tinggi iradiasi yang diterima pengering serta semakin banyak biji kakao yang dikeringkan, maka efisiensi pengeringan juga semakin tinggi dan kebutuhan energi spesifik semakin turun.Keywords: energy, efficiency, cocoa, solar dryer, bin-type dryer.

scholarly journals Technoeconomic Analysis of the Recovery of Phenols from Olive Mill Wastewater through Membrane Filtration and Resin Adsorption/Desorption

2021 ◽  
Vol 13 (4) ◽  
pp. 2376
Author(s):  
Dimitris P. Zagklis ◽  
Costas S. Papageorgiou ◽  
Christakis A. Paraskeva
Keyword(s):  
Capital Investment ◽  
Membrane Filtration ◽  
Hot Spot ◽  
Treatment Method ◽  
Olive Mill Wastewater ◽  
Operational Cost ◽  
Equipment Cost ◽  
Fixed Capital Investment ◽  
Adsorption Desorption ◽  
Olive Mill

Olive mill wastewater is an important agro-industrial waste with no established treatment method. The authors have developed a phenol separation method that could potentially cover the treatment cost of the waste. The purpose of this study was to identify any economic hotspots in the process, the operational cost and examine the margin of profit for such a process. The equipment cost was scaled for different treatment capacities and then used to estimate the fixed capital investment and the yearly operational cost. The highest purchased equipment cost was identified for the membrane filtration system, while the cost for resin replacement was identified as the highest operational cost. The lifespan of the resin used in the adsorption step was identified as an economic hot spot for the process, with the phenols separation cost ranging from 0.84 to 13.6 €/g of phenols for a resin lifespan of 5–100 adsorption/desorption cycles. The lifespan of the resin proved to be the single most important aspect that determines the phenols separation cost. The price range that was calculated for the product of the process is very promising because of the typical value of antioxidants and the low concentration of phenols that are needed for food supplements and cosmetics.

Biocomposite spheres based on aluminum oxide dispersed with orange-peel powder for adsorption of phenol from batch membrane fraction of olive mill wastewater

2021 ◽  
Vol 42 ◽  
pp. 100402
Author(s):  
Jacques Romain Njimou ◽  
John Godwin ◽  
Hugues Pahimi ◽  
S. Andrada Maicaneanu ◽  
Fridolin Kouatchie-Njeutcha ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Membrane Fraction ◽  
Orange Peel ◽  
Olive Mill Wastewater ◽  
Olive Mill

scholarly journals Antioxidant Properties of Olive Mill Wastewater Polyphenolic Extracts on Human Endothelial and Vascular Smooth Muscle Cells

Foods ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 800
Author(s):  
Anna Maria Posadino ◽  
Annalisa Cossu ◽  
Roberta Giordo ◽  
Amalia Piscopo ◽  
Wael M Abdel-Rahman ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Cell Death ◽  
Smooth Muscle ◽  
Vascular Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Olive Oil ◽  
Vascular Smooth Muscle Cells ◽  
Muscle Cells ◽  
Olive Mill Wastewater ◽  
Olive Mill

This work aims to analyze the chemical and biological evaluation of two extracts obtained by olive mill wastewater (OMW), an olive oil processing byproduct. The exploitation of OMW is becoming an important aspect of development of the sustainable olive oil industry. Here we chemically and biologically evaluated one liquid (L) and one solid (S) extract obtained by liquid–liquid extraction followed by acidic hydrolysis (LLAC). Chemical characterization of the two extracts indicated that S has higher phenol content than L. Hydroxytyrosol and tyrosol were the more abundant phenols in both OMW extracts, with hydroxytyrosol significantly higher in S as compared to L. Both extracts failed to induce cell death when challenged with endothelial cells and vascular smooth muscle cells in cell viability experiments. On the contrary, the higher extract dosages employed significantly affected cell metabolic activity, as indicated by the MTT tests. Their ability to counteract H2O2-induced oxidative stress and cell death was assessed to investigate potential antioxidant activities of the extracts. Fluorescence measurements obtained with the reactive oxygen species (ROS) probe H2DCF-DA indicated strong antioxidant activity of the two OMW extracts in both cell models, as indicated by the inhibition of H2O2-induced ROS generation and the counteraction of the oxidative-induced cell death. Our results indicate LLAC-obtained OMW extracts as a safe and useful source of valuable compounds harboring antioxidant activity.

scholarly journals Olive mill wastewater effects on durum wheat crop attributes and soil microbial activities: A pilot study in Syria

2021 ◽  
Author(s):  
Jehan Khalil ◽  
Hasan Habib ◽  
Michael Alabboud ◽  
Safwan Mohammed
Keyword(s):  
Durum Wheat ◽  
Germination Rate ◽  
Soil Samples ◽  
Olive Mill Wastewater ◽  
The Other ◽  
Wheat Crop ◽  
Microbial Activities ◽  
Soil Microbial ◽  
Growing Seasons ◽  
Olive Mill

AbstractOlive mill wastewater is one of the environmental problems in semiarid regions. The main goals of this study were to investigate the impacts of different olive mill wastewater levels on durum wheat (Triticum aestivum var. Douma1) production and soil microbial activities (i.e., bacteria and fungi). A pot experiment was conducted during the growing seasons 2015/2017 to evaluate the effect of three levels of olive mill wastewater on both growth and productivity attributes of wheat. Vertisol soil samples were collected from southern Syria. Two months before wheat cultivation, three levels of olive mill wastewater: T5 (5 L/m 2), T10 (10 L/m2) and T15 (15 L/m 2) were added to pots filled with the collected soil samples. Also, a control (T0) free of olive mill wastewater was considered as a reference. Results showed a significant increase (p < 0.05) in germination rate (%), plant height (cm), ear length (cm), kernels number, kernels weight per ear (g) and grain yield (g/m2) compared to control. However, T5 treatment did not induce a significant increase in terms of ear length, kernels weight per ear or yield (in the second season). On the other hand, T10 treatment had recorded the best results compared with the other two treatments (T5, T15). Similarly, the results showed a significant increase in the number of bacterial and fungi cells by increasing olive mill wastewater concentration. This research provides promising results toward using olive mill wastewater in an eco-friendly way under Syrian conditions.

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