The combination of coagulation, acid cracking and Fenton-like processes for olive oil mill wastewater treatment: phytotoxicity reduction and biodegradability augmentation

2015 ◽  
Vol 71 (7) ◽  
pp. 1097-1105 ◽  
Author(s):  
Ahmadreza Yazdanbakhsh ◽  
Fayyaz Mehdipour ◽  
Akbar Eslami ◽  
Hajar Sharifi Maleksari ◽  
Farshid Ghanbari
Keyword(s):  
Olive Oil ◽  
Ferric Chloride ◽  
Oxygen Demand ◽  
Suitable Condition ◽  
Organic Load ◽  
Olive Oil Mill Wastewater ◽  
Polyaluminum Chloride ◽  
Coagulation Process ◽  
Cracking Process ◽  
Final Effluent

Olive oil mill wastewater (OOMW) is one of the most important industrial wastewaters in the world due to high organic load and phenolic compounds. In this study, an integration of three processes including coagulation, acid cracking and Fenton-like was evaluated to treat OOMW. The performance of alum, ferric chloride and polyaluminum chloride was studied as coagulants. Among coagulants, ferric chloride showed the best results in comparison with the others. Coagulation process with FeCl3 removed 91.2% chemical oxygen demand (COD), 91.3% phenol, 98.9% total suspended solids and 99.2% turbidity at condition of pH = 6 and 3,000 mg/L coagulant dosage. Acid cracking process following the coagulation process with ferric chloride could slightly degrade organic compounds and provided suitable condition for the next process. Fenton-like process with zero valent iron (ZVI) was applied after coagulation and acid cracking. The optimal removal efficiency was achieved by Fenton-like process which was accomplished in condition of 7 g/L ZVI, 1,000 mg/L H2O2 and 180 min reaction time. The biodegradability of final effluent of this integration was improved significantly and biochemical oxygen demand5/COD value increased from 0.14 to 0.83. The results of germination tests revealed that phytotoxicity of the final effluent decreased.

scholarly journals Physico-chemical characterization of olive-oil mill wastewaters of Ben Karrich area (Tetouan province, North of Morocco) and optimization study of their treatment using activated carbon

2018 ◽  
Vol 7 (4) ◽  
pp. 253-258 ◽  
Author(s):  
Dorsaf Bouharat ◽  
Farida EL Yousfi ◽  
Anas Ellaghdach ◽  
Badr Dine Souhail ◽  
Nabila Slimani Alaoui
Keyword(s):  
Activated Carbon ◽  
Phenolic Compounds ◽  
Olive Oil ◽  
Oxygen Demand ◽  
Chemical Characterization ◽  
Operating Conditions ◽  
Organic Load ◽  
Total Phenolic ◽  
Total Phenolic Compounds

A physio-chemical characterization of olive oil mill wastewater (OMW) obtained from a continuous two-phases olive oil extraction process is presented. High organic load of OMW from Ben Karrich region has been registered. The values of chemical oxygen demand (COD) and total phenolic compounds were 84.5 g of O2/L and 3.79 g/L, respectively. In this sense, a treatment using activated carbon as adsorbent was proposed. Results have shown high removal percentages in total phenolic compounds (98%) and COD (90%). The optimal operating conditions were 4 g of activated carbon and adsorbing time equal to 5 minutes.

scholarly journals New Insights on Protein Recovery from Olive Oil Mill Wastewater through Bioconversion with Edible Filamentous Fungi

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1210 ◽  
Author(s):  
Taner Sar ◽  
Murat Ozturk ◽  
Mohammad J. Taherzadeh ◽  
Jorge A. Ferreira
Keyword(s):  
Olive Oil ◽  
Protein Content ◽  
Filamentous Fungi ◽  
Fungal Biomass ◽  
Oxygen Demand ◽  
Nitrogen Addition ◽  
Olive Oil Mill Wastewater ◽  
Untreated Wastewater ◽  
Olive Oil Mills ◽  
Edible Filamentous Fungi

Olive oil mills represent an important sector in the Mediterranean Sea Basin but also an environmental hazard due to untreated wastewater. Recovery of nutrients from olive oil mill wastewater (OMWW) as protein-rich microbial biomass can produce novel feed and reduce its chemical oxygen demand; however, low-protein containing products have been reported. New strategies leading to higher protein-containing fungal biomass could renew the research interest on bioconversion for pollution mitigation of OMWW. In this work, through cultivation of edible filamentous fungi (Aspergillus oryzae, Neurospora intermedia, and Rhizopus delemar), a link between the protein content in the originated fungal biomass, and the addition of nitrogen and medium dilution was established. Addition of nitrogen in the form of NaNO3 reduced the cultivation time from 96 h to 48 h while achieving a similar biomass mass concentration of 8.43 g/L and increased biomass protein content, from w = 15.9% to w = 29.5%. Nitrogen addition and dilution of OMWW, and consequent reduction of suspended solids, led to an increase in the protein content to up to w = 44.9%. To the best of our knowledge, the protein contents achieved are the highest reported to date and can open new research avenues towards bioconversion of OMWW using edible filamentous fungi.

scholarly journals ADSORPTION OF PHENOLS FROM OLIVE OIL MILL WASTEWATER AS WELL AS N AND P FROM A SIMULATED CITY WASTEWATER LIQUID ON ACTIVATED GREEK LIGNITES

2017 ◽  
Vol 43 (5) ◽  
pp. 2294
Author(s):  
C. Papanicolaou ◽  
G. Triantafyllou ◽  
Ν. Pasadakis ◽  
Α,Ε. Foscolos
Keyword(s):  
Olive Oil ◽  
Surface Area ◽  
Oxygen Demand ◽  
Medium Size ◽  
Nitrogen And Phosphorus ◽  
Olive Oil Mill Wastewater ◽  
Cod Reduction ◽  
Economic Exploitation ◽  
Activated Coal ◽  
Adsorption Of Nitrogen

The results show that surface area of activated coal samples increased substantially and in some more than the commercial one. The increase in surface area was higher the higher the carbon content and the lower the ash content. The adsorption capacity of phenols and the decrease of COD (Chemical Oxygen Demand) in olive oil mil wastewater disposals were measured in selected samples as well as the decrease of COD and the adsorption of nitrogen and phosphorus from a solution which simulates city waste disposals were measured in 14 selected Greek lignites and 1 commercially available activated lignite sample (HOK). The maximum recorded adsorption of phenol was 30.6 mg/g of activated lignite while the commercial one (HOK) adsorbed 16 mg/g of activated lignite. The COD reduction was 1262 mg of COD/g of activated lignite while in the commercial one the reduction was 439 mg of COD/g of activated lignite. The maximum adsorption of N and P from the simulated city waste liquid was 6.41 mg/g of activated lignite and 2.52 mg/g of activated lignite, respectively. while the commercial one (HOK) adsorbed 2.84 mg/g and 2.42 mg/g, respectively. Finally, the COD reduction was 50.28 mg/g of activatedlignite and 34.92 mg/g for the commercially one (HOK). The results show that Greek activated lignites can be used successfully for cleaning industrial and city wastes. These findings open the door for the economic exploitation of small to medium size lignite deposits in Greece, which are widespread in Greece.

Olive Oil Mill Wastewater Treatment by the Electro-Fenton Process

2006 ◽  
Vol 3 (5) ◽  
pp. 345 ◽  
Author(s):  
Nizar Bellakhal ◽  
Mehmet A. Oturan ◽  
Nihal Oturan ◽  
Mohamed Dachraoui
Keyword(s):  
Wastewater Treatment ◽  
Olive Oil ◽  
Model Compound ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Fenton Process ◽  
Colour Intensity ◽  
Olive Oil Mill Wastewater ◽  
Chemical Reagents ◽  
Mediterranean Countries

Environmental Context. The combination of the Fenton’s reagent with electrochemistry (the electro-Fenton process) represents an efficient method for wastewater treatment. This study describes the use of this process to clean olive oil mill wastewater, which is a real environmental problem in Mediterranean countries. Contrary to the conventional methods which reduce the pollution by removing the pollutants from the wastewater, the electro-Fenton process is shown to fully destroy (mineralize) olive oil mill wastes in water without previous extraction and without addition of chemical reagents. Abstract. Treatment of olive oil mill wastewater is one of the most important environmental problems for Mediterranean countries. This wastewater contains many organic compounds like polyphenols, which are very difficult to treat by classical techniques. An advanced electrochemical oxidation process, the electro-Fenton process, has been used as a way of removing chemical oxygen demand and colour intensity from olive oil mill wastewater. Vanillic acid, which has been selected as a model compound, and olive oil mill wastewater have been completely mineralized by the electro-Fenton process with a carbon felt cathode, using Fe2+ ions as the catalyst.

Experimental Analysis of Floc Formation Time and Order in Coagulation Process

2010 ◽  
Vol 113-116 ◽  
pp. 1058-1062 ◽  
Author(s):  
Jian Hai Zhao ◽  
Yan Ping Lai
Keyword(s):  
Ferric Chloride ◽  
Experimental Analysis ◽  
Aluminum Sulfate ◽  
Formation Time ◽  
Polyaluminum Chloride ◽  
Laser Method ◽  
Minimum Dose ◽  
Coagulation Process ◽  
Ph Conditions

The floc formation time and order were identified with the laser method while three kinds of coagulants such as polyaluminum chloride, ferric chloride, and aluminum sulfate were tested for comparison of their coagulation process. Floc formation time of three coagulants tended to decrease with the increase of coagulant dose and turbidity. When the pH was 7, floc formation time of PAC、Al2(SO4)3 were smaller than that of other pH conditions. The minimum formation time of FeCl3 occurred when the pH was 6. The minimum dose for floc formation was 0.68, 0.88, and 1.04 mg/L for PAC, FeCl3, and Al2(SO4)3, respectively. It was also found that the floc formation order of PAC was the largest among three coagulants.

Treatment of a complex landfill leachate with peat

1978 ◽  
Vol 5 (1) ◽  
pp. 83-97 ◽  
Author(s):  
Robert D. Cameron
Keyword(s):  
Chemical Oxygen Demand ◽  
Ferric Chloride ◽  
Landfill Leachate ◽  
Metal Removal ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Manganese Concentration ◽  
Chemical Pretreatment ◽  
Iron Manganese

The use of cheap, locally available peat as a treatment method for landfill leachate was investigated by passing leachate through plexiglass columns filled with an amorphous-granular peat. Preliminary adjustment of pH showed that reducing pH to 4.8 dramatically reduced adsorption. Increasing the pH to 8.4, metal removal was increased owing to filtration of precipitated metals. The best adsorption of metals occurred at the 'natural' pH of 7.1. Manganese was found to be the limiting pollutant. At the 0.05 mg/ℓ maximum acceptable manganese concentration 94% of the total metals were removed, requiring 159 kg of peat per 1000 ℓ of leachate.Resting the peat for 1 month did significantly increase removal capacity.Desorption of some contaminants occurred when water was percolated through the peat. The desorption test effluent was not toxic to fish although iron, lead and COD (chemical oxygen demand) exceeded acceptable values.Chemical pretreatment using lime and ferric chloride achieved significant iron, manganese and calcium removals. Chemical pretreatment followed by peat adsorption offered no advantage other than reducing toxicity to fish.Peat treatment alone was effective in reducing concentrations to a level that was non-toxic to fish.

scholarly journals The Start-Up of Continuous Biohydrogen Production from Cheese Whey: Comparison of Inoculum Pretreatment Methods and Reactors with Moving and Fixed Polyurethane Carriers

2021 ◽  
Vol 11 (2) ◽  
pp. 510
Author(s):  
Elza R. Mikheeva ◽  
Inna V. Katraeva ◽  
Andrey A. Kovalev ◽  
Dmitriy A. Kovalev ◽  
Alla N. Nozhevnikova ◽  
...  
Keyword(s):  
Cheese Whey ◽  
Hydraulic Retention Time ◽  
Continuous Production ◽  
Oxygen Demand ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Acid Pretreatment ◽  
Methanogenic Activity ◽  
Start Up ◽  
Load Rate

This article presents the results of the start-up of continuous production of biohydrogen from cheese whey (CW) in an anaerobic filter (AF) and anaerobic fluidized bed (AFB) with a polyurethane carrier. Heat and acid pretreatments were used for the inactivation of hydrogen-scavengers in the inoculum (mesophilic and thermophilic anaerobic sludge). Acid pretreatment was effective for thermophilic anaerobic sludge to suppress methanogenic activity, and heat treatment was effective for mesophilic anaerobic sludge. Maximum specific yields of hydrogen, namely 178 mL/g chemical oxygen demand (COD) and 149 mL/g COD for AFB and AF, respectively, were obtained at the hydraulic retention time (HRT) of 4.5 days and organic load rate (OLR) of 6.61 kg COD/(m3 day). At the same time, the maximum hydrogen production rates of 1.28 and 1.9 NL/(L day) for AF and AFB, respectively, were obtained at the HRT of 2.02 days and OLR of 14.88 kg COD/(m3 day). At the phylum level, the dominant taxa were Firmicutes (65% in AF and 60% in AFB), and at the genus level, Lactobacillus (40% in AF and 43% in AFB) and Bifidobacterium (24% in AF and 30% in AFB).

Potential of Olive Oil Mill Wastewater as a Source of Polyphenols for the Treatment of Skin Disorders: A Review

2021 ◽  
Author(s):  
Morgane Carrara ◽  
Mary T. Kelly ◽  
Florence Roso ◽  
Michel Larroque ◽  
Delphine Margout
Keyword(s):  
Olive Oil ◽  
Skin Disorders ◽  
Olive Oil Mill Wastewater

scholarly journals Boat Pressure Washing Wastewater Treatment with Calcium Oxide and/or Ferric Chloride

2012 ◽  
Vol 63 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Višnja Oreščanin ◽  
Robert Kollar ◽  
Karlo Nađ ◽  
Ivanka Mikelić ◽  
Nenad Mikulić
Keyword(s):  
Wastewater Treatment ◽  
Calcium Oxide ◽  
Ferric Chloride ◽  
Combined Treatment ◽  
Cost Effective ◽  
Chemical Precipitation ◽  
Total Dissolved Solids ◽  
Washing Wastewater ◽  
User Friendly ◽  
Final Effluent

Boat Pressure Washing Wastewater Treatment with Calcium Oxide and/or Ferric ChlorideThe aim of this study was to investigate the efficiency of (1) chemical precipitation by calcium oxide, (2) coagulation/flocculation by ferric chloride (FC), and (3) the combination these two methods in reducing the toxicity of wastewater generated by boat pressure washing. All three methods gave satisfactory results in the removal of colour, turbidity, Cr, Fe, Cu, Zn, and Pb. The concentrations of heavy metals were lowered below national limits with 1 g of CaO, 2.54 mg of Fe3+ in the form of FeCl3x6H2O, and the combination of 0.25 g of CaO and 5.08 mg of Fe3+ per 50 mL of wastewater. Both CaO (1.50 g per 50 mL of wastewater) and FC proved efficient, but their combination yielded a significantly better performance: 99.41 %, 100.00 %, 97.87 %, 99.09 %, 99.90 %, 99.46 % and 98.33 % for colour, turbidity, Cr, Fe, Cu, Zn, and Pb respectively. For colour, Cr, Cu, Zn, and Pb removal efficiencies increased in the following order: FC<CaO<CaO+FC, while this order for turbidity and Fe was as follows: CaO<FC<CaO+FC. As expected, all three methods increased the concentration of total dissolved solids in the final effluent. Our results suggest that the combined treatment of marina wastewaters with calcium oxide followed by ferric chloride is efficient, cost-effective, and user-friendly.

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