Effect of Fenton pretreatment on anaerobic digestion of olive mill wastewater and olive mill solid waste in mesophilic conditions

Maamir, Wail; Ouahabi, Yasmine Ryma; Poncin, Souhila; Li, Huai Z.; Bensadok, K.

doi:10.1080/15435075.2017.1307201

Cited by 35 publications

(23 citation statements)

References 30 publications

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“…Thus, AD has been proposed for the treatment of OMSW and the results show, at mesophilic temperature, a COD removal efficiency in the range of 96.8% -82.9% [6]. AD is difficult to apply for lignocellulosic residues such as OMSW, the presence of lignin greatly limits hydrolytic step of AD, as well as the crystallinity of cellulose, which limits the surface availability by reducing the biodegradability [7]. To overcome these restrictions and improve its biodigestibility, a pretreatment it is generally required to break the complex lignocellulosic structure.…”

Section: Introductionmentioning

confidence: 99%

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Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Fernández-Rodríguez

Lama-Calvente

Jiménez‐Rodríguez

et al. 2020

Biomass Conv. Bioref.

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The aim of this study was to investigate the effect of a soft-hydrothermal pre-treatment (SHP) on olive mill solid waste (OMSW) and its subsequent anaerobic digestion (AD). OMSW was pre-treated in an autoclave at temperatures of 121 ºC and 133 ºC and excess pressures of 1.1 and 2.1 bars, respectively at heating times of 15, 20 and 30 minutes. The digestibility of pre-treated and untreated OMSW was determined in terms of methane potential through using biochemical methane potentials tests (BMP). An important solubilisation of high valuable compounds such us hydroxytyrosol, and 3,4dihydroxyphenylglycol was observed after pre-treatments. SHP showed a significant reduction on fiber length and width (p < 0.05). A higher polysaccharides solubilisation was observed in treatment at 121 ºC comparing with that observed at 133 ºC. SHP carried out at 121 ºC, 1.1 bar (30 min) (pre-treatment A1), allowed obtaining the highest methane yield (380 ± 5 mL CH 4 /g VS), which was 12.3% higher than that obtained for untreated OMSW. Pearson correlation (PEC) and Principal Component Analysis (PCA) were carried out. PEC showed a positive correlation with phenol vanillic acid and PCA grouped pre-treatment A1 with polysaccharides solubilization. The influence of the SHP conditions on the AD of OMSW was assessed through the monitoring of process performance and calculation of kinetic parameters by using the Transference Function model.

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Section: Introductionmentioning

confidence: 99%

“…To overcome these restrictions and improve its biodigestibility, a pretreatment it is generally required to break the complex lignocellulosic structure. Various pretreatment methods previously assayed for OMSW were Fenton [7], ultrasonic and thermal [8][9].…”

Section: Introductionmentioning

confidence: 99%

Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Fernández-Rodríguez

Lama-Calvente

Jiménez‐Rodríguez

et al. 2020

Biomass Conv. Bioref.

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“…The maximum methane production rate was enhanced, although only a 5% methane yield increase was obtained [19]. Fenton reagent addition and steam explosion pretreatments had a negative impact on methane production, achieving 50% of reduction for steam explosion [19,30]. Indeed, high temperature and pressure conditions can lead to the formation of recalcitrant compounds, which affect the anaerobic digestion process [31].…”

Section: Resultsmentioning

confidence: 99%

Combination of Dry Milling and Separation Processes with Anaerobic Digestion of Olive Mill Solid Waste: Methane Production and Energy Efficiency

et al. 2018

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This experimental work aims at investigating the effects of milling; sieving; and electrostatic separation on the biochemical methane potential of two olive pomaces from traditional olive oil extraction (M) and from a three-phase system (T). Sieving proved to be efficient for increasing the soluble chemical oxygen demand in the smallest fractions of the sieve of both M (62%) and T (78%) samples. The positive fraction following electrostatic separation also enhanced chemical oxygen demand (COD) solubilisation by 94%, in comparison to sample T milled at 4 mm. Sieve fractions with a size greater than 0.9 mm contained 33% and 47% less lipids for the M and T biomasses; respectively. Dry fractionation modified sample properties as well as lipid and fiber distribution. Concomitantly; milling increased the accessibility and facilitated the release of organic matter. The energy balance was positive after knife milling and sieving; while ball milling and ultrafine milling proved to be inefficient.

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“…Therefore, some form of pretreatment and post treatment to eliminate phenolic compounds from OMW, apart from simple dilution, is usually necessary in order to reduce its toxicity and to permit the occurrence of microbial fermentation. In this regard, many authors directed their attention to a more promising alternative such as, co-digestion of OMW with other substrate like agrolivestock (Gonçalves et al, 2012a;2012b;Sampaio et al, 2011;Kougias et al, 2014), physical chemical pretreatment (Filidei et al, 2003;Ginos et al, 2006;Ruggeri et al, 2015) and Fenton's reagent process (Amor et al, 2015;Maamir et al, 2017).…”

Section: Important Strategies For Omw Treatmentmentioning

confidence: 99%

Chemical Coagulation/Flocculation Processes for Removal of Phenolic Compounds from Olive Mill Wastewater: A Comprehensive Review

Achak¹,

Elayadi²,

Boumya³

2019

American Journal of Applied Sciences

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Olive oil extraction processes generate three phases: Olive oil, solid residue (pomace) and aqueous liquor Olive Mill Wastewater (OMW). OMW causes serious environmental deteriorations such as coloring of natural waters, alteration of soil quality, phytotoxicity and odor nuisance. The direct discharge of this effluent into the soil bring various negative effects on the environment, due to its high load of organic matter and phenolic compounds. Coagulation, flocculation and their combination processes are among the most applied processes for wastewater treatment. The application of coagulation technique using mineral and inorganic polymeric coagulants and acid cracking is not always effective to reduce COD and phenolic compounds from OMW except lime. Although direct flocculation is a low treatment cost, use less chemical and produce less sludge, the efficiency of COD and phenolic compounds removal remain very low. Coagulationflocculation process is developed in order to enhance the removal efficiency of organic matter from OMW by optimizing the operating conditions. However, many studies showed that the combination of various cationic organic coagulant and flocculant agents did not show any significant decrease of COD and phenolic compounds except for lime combination. In the present review, recent research studies dealing with the application of coagulation/flocculation for removal of phenolic compounds and COD from OMW are presented and compared. Furthermore, the main factors that influence the selection between coagulation, direct flocculation and coagulation-flocculation are presented and the principal removal mechanisms are discussed.

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Effect of Fenton pretreatment on anaerobic digestion of olive mill wastewater and olive mill solid waste in mesophilic conditions

Cited by 35 publications

References 30 publications

Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Impact of soft hydrothermal pre-treatments on the olive mill solid waste characteristics and its subsequent anaerobic digestion

Combination of Dry Milling and Separation Processes with Anaerobic Digestion of Olive Mill Solid Waste: Methane Production and Energy Efficiency

Chemical Coagulation/Flocculation Processes for Removal of Phenolic Compounds from Olive Mill Wastewater: A Comprehensive Review

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