Photo-Fenton Treatment of Olive Mill Wastewater Applying a Combined Fenton/Flocculation Pretreatment

2005 ◽  
Vol 129 (1) ◽  
pp. 53-59 ◽  
Author(s):  
W. Gernjak ◽  
T. Krutzler ◽  
R. Bauer
Keyword(s):  
Hordeum Vulgare ◽  
Reaction Rate ◽  
Suspended Solids ◽  
Olive Mill Wastewater ◽  
Solar Irradiation ◽  
Initial Value ◽  
Hordeum Vulgare L ◽  
Phenolic Substances ◽  
Parabolic Collector ◽  
Olive Mill

In this work, a pretreatment involving a combination of acidification, the Fenton method, and flocculation with polyelectrolytes was successfully applied to remove the suspended solids of Olive mill wastewater (OMW). This pretreatment strongly augmented the reaction rate in the following photo-Fenton treatment under solar irradiation in a Compound Parabolic Collector pilot-plant at Plataforma Solar de Almería. The content in phenolic substances could be degraded down to zero, while DOC was degraded down to about 25% of the initial value. In the work we describe different aspects concerning the process parameters of the pretreatment and the photo-Fenton treatment. Furthermore, decrease in phytotoxicity in the course of the treatment was monitored by germination tests with barley (hordeum vulgare L.). The results indicate that acute phytotoxicity can be substantially reduced by the application of the above mentioned pretreatment, enabling OMW to be used for ferti-irrigation in agriculture.

Treatment of olive mill wastewater by chemical processes: effect of acid cracking pretreatment

2014 ◽  
Vol 69 (7) ◽  
pp. 1453-1461 ◽  
Author(s):  
B. Hande Gursoy-Haksevenler ◽  
Idil Arslan-Alaton
Keyword(s):  
Acute Toxicity ◽  
Chemical Treatment ◽  
Suspended Solids ◽  
Olive Mill Wastewater ◽  
Wastewater Sample ◽  
Fenton’S Reagent ◽  
Total Phenols ◽  
Fenton's Reagent ◽  
Treatment Processes ◽  
Olive Mill

The effect of acid cracking (pH 2.0; T 70 °C) and filtration as a pretreatment step on the chemical treatability of olive mill wastewater (chemical oxygen demand (COD) 150,000 m/L; total organic carbon (TOC) 36,000 mg/L; oil–grease 8,200 mg/L; total phenols 3,800 mg/L) was investigated. FeCl3 coagulation, Ca(OH)2 precipitation, electrocoagulation using stainless steel electrodes and the Fenton's reagent were applied as chemical treatment methods. Removal performances were examined in terms of COD, TOC, oil–grease, total phenols, colour, suspended solids and acute toxicity with the photobacterium Vibrio fischeri. Significant oil–grease (95%) and suspended solids (96%) accompanied with 58% COD, 43% TOC, 39% total phenols and 80% colour removals were obtained by acid cracking-filtration pretreatment. Among the investigated chemical treatment processes, electrocoagulation and the Fenton's reagent were found more effective after pretreatment, especially in terms of total phenols removal. Total phenols removal increased from 39 to 72% when pretreatment was applied, while no significant additional (≈10–15%) COD and TOC removals were obtained when acid cracking was coupled with chemical treatment. The acute toxicity of the original olive mill wastewater sample increased considerably after pretreatment from 75 to 89% (measured for the 10-fold diluted wastewater sample). An operating cost analysis was also performed for the selected chemical treatment processes.

scholarly journals Precipitation of Solid Waste in Olive Mill Wastewater by Coagulation using Calcium Carbonate (CaCO3)

2021 ◽  
Vol 4 (3) ◽  
pp. 78-85
Author(s):  
Khaled Rawajfeh
Keyword(s):  
Calcium Carbonate ◽  
Solid Waste ◽  
Suspended Solids ◽  
Animal Feed ◽  
Electrical Conductance ◽  
Solid Material ◽  
Olive Mill Wastewater ◽  
Heating Value ◽  
Study Results ◽  
Olive Mill

This study aimed to use a chemical coagulant to treat Olive Mill Wastewater (OMW) in such a way as to improve and expedite the process of precipitating the solid waste material present in the wastewater. This process is of extreme importance in harvesting the solid material that can be used as domestic or industrial fuel material and as a supplement to animal feed. The chemical coagulant used in this study was calcium carbonate (CaCO3). The effect of the addition of this coagulant on some physical properties of olive mill wastewater (OMW) such as pH, electrical conductance (EC), the precipitated amount of the total suspended solids (TSS), and the higher heating value (HHV) of the precipitated solids was studied. It was found that small amounts of CaCO3 need to be added to affect the operation. The study results showed that the optimum value to be used was around three wt/wt %.

Ultrastructure and Senescence in an Achloroplastic Mutant of Hordeum vulgare L. cv. Dyan

1992 ◽  
Vol 50 (1) ◽  
pp. 844-845
Author(s):  
R.H.M. Cross ◽  
C.E.J. Botha ◽  
A.K. Cowan ◽  
B.J. Hartley
Keyword(s):  
Cell Wall ◽  
Hordeum Vulgare ◽  
Leaf Tissue ◽  
Ultrastructural Changes ◽  
Hordeum Vulgare L ◽  
Mesophyll Cells ◽  
Lethal Mutant ◽  
Cytoplasmic Matrix ◽  
Close Proximity ◽  
Pinocytotic Vesicles

Senescence is an ordered degenerative process leading to death of individual cells, organs and organisms. The detection of a conditional lethal mutant (achloroplastic) of Hordeum vulgare has enabled us to investigate ultrastructural changes occurring in leaf tissue during foliar senescence.Examination of the tonoplast structure in six and 14 day-old mutant tissue revealed a progressive degeneration and disappearance of the membrane, apparently starting by day six in the vicinity of the mitochondria associated with the degenerating proplastid (Fig. 1.) where neither of the plastid membrane leaflets is evident (arrows, Fig. 1.). At this stage there was evidence that the mitochondrial membranes were undergoing retrogressive changes, coupled with disorganization of cristae (Fig. 2.). Proplastids (P) lack definitive prolamellar bodies. The cytoplasmic matrix is largely agranular, with few endoplasmic reticulum (ER) cisternae or polyribosomal aggregates. Interestingly, large numbers of actively-budding dictysomes, associated with pinocytotic vesicles, were observed in close proximity to the plasmalemma of mesophyll cells (Fig. 3.). By day 14 however, mesophyll cells showed almost complete breakdown of subcellular organelle structure (Fig. 4.), and further evidence for the breakdown of the tonoplast. The final stage of senescence is characterized by the solubilization of the cell wall due to expression and activity of polygalacturonase and/or cellulose. The presence of dictyosomes with associated pinocytotic vesicles formed from the mature face, in close proximity to both the plasmalemma and the cell wall, would appear to support the model proposed by Christopherson for the secretion of cellulase. This pathway of synthesis is typical for secretory glycoproteins.

ИЗМЕНЧИВОСТЬ ЯЧМЕНЯ (Hordeum vulgare L.) РАЗНОГО ГЕОГРАФИЧЕСКОГО ПРОИСХОЖДЕНИЯ ПО ЭЛЕМЕНТАМ СТРУКТУРЫ УРОЖАЯ

2012 ◽  
pp. 33-40
Author(s):  
А.В. ЖЕЛЕЗНОВ ◽  
◽  
Н.Б. ЖЕЛЕЗНОВА ◽  
Т.В. КУКОЕВА ◽  
Н.В. БУРМАКИНА ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Hordeum Vulgare L

ВНУТРИВИДОВОЙ ПОЛИМОРФИЗМ ЯРОВОГО ЯЧМЕНЯ (Hordeum vulgare L.) ПО УСТОЙЧИВОСТИ К ДЕЙСТВИЮ СВИНЦА

2014 ◽  
pp. 78-87 ◽  
Author(s):  
А.В. ДИКАРЕВ ◽  
◽  
В.Г. ДИКАРЕВ ◽  
Н.С. ДИКАРЕВА ◽  
С.А. ГЕРАСЬКИН ◽  
...  
Keyword(s):  
Hordeum Vulgare ◽  
Hordeum Vulgare L
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