Sequential treatment of diluted olive pomace leachate by digestion in a pilot scale UASB reactor and BDD electrochemical oxidation

Katsoni, Αthanasia; Mantzavinos, Dionissios; Diamadopoulos, Evan

doi:10.1016/j.watres.2014.03.010

Cited by 42 publications

(20 citation statements)

References 30 publications

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“…Pure deep eutectic solvents (choline chloride with urea or ethylene glycol) coupled with an electrochemical process was investigated to dissolve and process electrochemical oxidative depolymerization of kraft lignin (Di Marino et al, 2016 ) wherein guaiacol and vanillin were detected as the most abundant products. Electrochemical technology has been deployed to enhance biogas formation via aerobic digestion (Song et al, 2010 ; Katsoni et al, 2014 ). Electrochemical process for pretreatment of waste activated sludge showed relatively low specific energy input with improved methane production when compared to other pretreatment methods involving microwave, ultrasound, thermal, Fenton, and ozone (Ye et al, 2016 ).…”

Section: Greener Oxidative Processes For Biomass Conversion-selectivimentioning

confidence: 99%

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

et al. 2018

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Anthropogenic climate change, principally induced by the large volume of carbon dioxide emission from the global economy driven by fossil fuels, has been observed and scientifically proven as a major threat to civilization. Meanwhile, fossil fuel depletion has been identified as a future challenge. Lignocellulosic biomass in the form of organic residues appears to be the most promising option as renewable feedstock for the generation of energy and platform chemicals. As of today, relatively little bioenergy comes from lignocellulosic biomass as compared to feedstock such as starch and sugarcane, primarily due to high cost of production involving pretreatment steps required to fragment biomass components via disruption of the natural recalcitrant structure of these rigid polymers; low efficiency of enzymatic hydrolysis of refractory feedstock presents a major challenge. The valorization of lignin and cellulose into energy products or chemical products is contingent on the effectiveness of selective depolymerization of the pretreatment regime which typically involve harsh pyrolytic and solvothermal processes assisted by corrosive acids or alkaline reagents. These unselective methods decompose lignin into many products that may not be energetically or chemically valuable, or even biologically inhibitory. Exploring milder, selective and greener processes, therefore, has become a critical subject of study for the valorization of these materials in the last decade. Efficient alternative activation processes such as microwave- and ultrasound irradiation are being explored as replacements for pyrolysis and hydrothermolysis, while milder options such as advanced oxidative and catalytic processes should be considered as choices to harsher acid and alkaline processes. Herein, we critically abridge the research on chemical oxidative techniques for the pretreatment of lignocellulosics with the explicit aim to rationalize the objectives of the biomass pretreatment step and the problems associated with the conventional processes. The mechanisms of reaction pathways, selectivity and efficiency of end-products obtained using greener processes such as ozonolysis, photocatalysis, oxidative catalysis, electrochemical oxidation, and Fenton or Fenton-like reactions, as applied to depolymerization of lignocellulosic biomass are summarized with deliberation on future prospects of biorefineries with greener pretreatment processes in the context of the life cycle assessment.

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Section: Greener Oxidative Processes For Biomass Conversion-selectivimentioning

confidence: 99%

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

et al. 2018

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“…In the case of agro-industrial effluents that usually contain biodegradable fractions, electrochemical oxidation is used as a post-treatment step to polish the final stream prior to discharge. The efficiency of hybrid systems comprising aerobic/anaerobic biological treatment followed by electrochemical oxidation over boron-doped diamond anodes has been demonstrated for the treatment of cheese whey (Katsoni et al, 2014a), olive pomace leachate (Katsoni et al, 2014b;Grafias et al, 2010) and table olive wastewater .…”

Section: Introductionmentioning

confidence: 99%

Treatment of table olive washing water using trickling filters, constructed wetlands and electrooxidation

Tatoulis

Stefanakis

Frontistis

et al. 2016

Environ Sci Pollut Res

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The production of table olives is a significant economic activity in Mediterranean countries. Table olive processing generates large volumes of rinsing water that are characterized by high organic matter and phenol contents. Due to these characteristics, a combination of more than one technology is imperative to ensure efficient treatment with low operational cost. Previously, biological filters were combined with electrooxidation to treat table olive washing water. Although this combination was successful in reducing pollutant loads, its cost could be further reduced. Constructed wetlands could be an eligible treatment method for integrated table olive washing water treatment as they have proved tolerant to high organic matter and phenol loads. Two pilot-scale horizontal subsurface constructed wetlands, one planted and one unplanted, were combined with a biological filter and electrooxidation over a boron-doped diamond anode to treat table olive washing water. In the biological filter inlet, chemical oxygen demand (COD) concentrations ranged from 5500 to 15,000 mg/L, while mean COD influent concentration in the constructed wetlands was 2800 mg/L. The wetlands proved to be an efficient intermediate treatment stage, since COD removal levels for the planted unit reached 99 % (mean 70 %), while the unplanted unit presented removal rates of around 65 %. Moreover, the concentration of phenols in the effluent was typically below 100 mg/L. The integrated trickling filter-constructed wetland-electrooxidation treatment system examined here could mineralize and decolorize table olive washing water and fully remove its phenolic content.

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“…[4,5]. Except for the conventional anaerobic suspended-growth reactor, UASB reactor is the main process encountered in the literature [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optimization of key factors affecting biogas production from synthetic wastewater by anaerobic granular sludge

Yang

Zhang

Xian

2016

Env Prog and Sustain Energy

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Factors affecting biogas production from synthetic wastewater in upflow anaerobic sludge blanket (UASB) reactor by anaerobic granular sludge were optimized using Response Surface Methodology (RSM) with Box‐Behnken Design. COD, NH4+‐N and sulphate were investigated as the experimental parameters. The experiments were conducted in 500 mL serum bottles with a working volume of 300 mL. The optimum conditions were determined as COD of 5610 mg L−1, NH4+‐N of 100 mg L−1 and sulphate of 1830 mg L−1 according to the experimental design. Under the optimal conditions, a maximum biogas yield of 604.05 mL, COD removal of 95.87%, NH4+‐N removal of 42.94% and sulphate removal of 80.29% were obtained. COD and sulphate showed the greatest individual and interactive effects on biogas yield (P < 0.05). COD had an individual effect on biogas yield (P < 0.0001) and NH4+‐N also had an individual effect on COD removal (P < 0.0001). The confirmation experiments conducted under the optimal conditions resulted in a biogas yield of 589.75 mL, COD removal of 94.09%, NH4+‐N removal of 39.31% and sulphate removal of 74.37%. The differences between predicted values and experimental results were satisfactory. The model had practical directive significance for optimizing key factors affecting biogas production from synthetic wastewater by anaerobic granular sludge. Optimizing COD, NH4+‐N, and sulphate can improve biogas production. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 11–20, 2017

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Sequential treatment of diluted olive pomace leachate by digestion in a pilot scale UASB reactor and BDD electrochemical oxidation

Cited by 42 publications

References 30 publications

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

Lignocellulosic Biomass Transformations via Greener Oxidative Pretreatment Processes: Access to Energy and Value-Added Chemicals

Treatment of table olive washing water using trickling filters, constructed wetlands and electrooxidation

Optimization of key factors affecting biogas production from synthetic wastewater by anaerobic granular sludge

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