High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

Feki, Emna; Battimelli, Audrey; Sayadi, Sami; Dhouib, Abdelhafidh; Khoufi, Sonia

doi:10.3390/molecules25030626

Cited by 19 publications

(11 citation statements)

References 42 publications

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“…Among different bioconversion techniques of these waste biomass for bioenergy production, the biochemical process was considered to be effective, which includes anaerobic digestion (AD) and fermentation techniques. AD is a biochemical process where the transformation of organic matter to biogas occurs by means of the presence of microorganisms in oxygen-limiting conditions (Feki et al, 2020).…”

Section: Frontiers In Energy Researchmentioning

confidence: 99%

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Preethi

Gunasekaran

2023

Front. Energy Res.

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The growing necessity for energy worldwide has led to the hunt for an interminable solution in the form of sustainable energy generation. To accomplish sustainability, these problems can be resolved using renewable waste biomass, which is readily accessible and low priced. Moreover, the ecological issue due to the disposal of this waste biomass into the environment is also counteracted by the use of this biomass for energy generation along with the substantial solid reduction for disposal. The presence of complex biopolymers in biomass, which hasten the hydrolysis step during energy generation, was enhanced by the application of a pretreatment method. The efficiency of the pretreatment methods was enhanced by maintaining the cost and energy usage since the commercialization of this method is largely limited. The major economic drivers are based on solid concentration and, thus, lead to higher capital costs. This study reveals the wide assortment of current progression in pretreatment techniques for treating waste biomass with special focus on combined and phase-separated pretreatment. Additionally, it converses the advantages and limitations of pretreatment methods. This pivotal investigation brings about the cost- and energy-effective conversion solution that paves the way for a sustainable energy system.

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Section: Frontiers In Energy Researchmentioning

confidence: 99%

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Preethi

Gunasekaran

2023

Front. Energy Res.

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“…That confirms to 66% higher gas production relating to COD removal. A higher concentration of biodegradable organic compounds, especial the volatile fatty acids were generated after Fenton reaction (Feki et al 2020). Through detection by Hach-Lang cuvette LCK365, the organic acid concentration in wastewater was increased from 1.02 to 2.03 g butyric acid equivalents (BAE)/ L after Fenton oxidation.…”

Section: Biogas Productionmentioning

confidence: 99%

Fenton oxidation as pretreatment for biomass gasification condensate: cost and biomass inhibition evaluation

Zhang

Pluschke

Geißen

2022

Water Science and Technology

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Gasification transforming organic compounds into energy-rich pyrolytic gas, is a climate-friendly treatment option for biological solid wastes. The condensates arising from the pyrolytic gas valorization is owing to high concentrations of small molecular phenols, cyanides, nitrogen-heterocyclics, aromatics and ammonium, posing an environmental and health hazard. In this paper, the watery phase of the biomass gasification condensate from spent mushroom compost (SMC), with a chemical oxygen demand (COD) of 16.4 g/L and total nitrogen of 2.3 g/L, was pretreated by Fenton oxidation. The experiments were conducted at room temperature with an initial pH value of 3, 5 and 8.9, hydrogen peroxide (H2O2) dosages between 15 and 100% of the normalized stoichiometric ratio (NSR), and Fe2+ dosages corresponding to molar ratio of H2O2:Fe2+ between 10 and 30. Through respiration inhibition assays, the best operational condition for detoxification was determined at an initial pH 5 with 30% NSR H2O2 dosage and molar ratio of H2O2:Fe2+ at 15:1. The specific operational cost of the Fenton oxidation was calculated at 2.17 €/kg CODelimination. In respiration inhibition assay, the oxygen consumption of wastewater after Fenton oxidation was increased by 316% in three days. In a 20 days’ biogas production test, the biogas production was increased by 81%.

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“…We found that the integration of the anaerobic process with the Fenton process and nanosilica absorbent was very effective in removing heavy metals from aged leachate (Figure 7). Feki et al (2020) found that batch and semi-continuous anaerobic fermentations had a positive effect on the electro-Fenton (EF) pretreatment in enhancing the biogas potential and stability of the anaerobic system. They revealed that the EF process can be a more consistent solution for the improvement of wasteactivated sludge anaerobic treatment.…”

Section: Data Derived From Nanosilica Absorbentmentioning

confidence: 99%

The Removal of Heavy Metals from the Leachate of Aged Landfill: The Application of the Fenton Process and Nanosilica Absorbent

Taghavi¹,

Naghipour²,

Ashrafi³

et al. 2021

Environ. Nat. Resour. J.

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Since leachate is typically composed of numerous constituents, its management requires special attention. After the raw leachate of Saravan in Rasht (Guilan Province, Iran) was transferred to a laboratory and its specifications were determined, it was subjected to experiments by the bench-scale method. The analyses of pH and heavy metals were performed in the main and control anaerobic reactors at time zero, before precipitation, and two hours after precipitation. After the anaerobic process was over and the optimal retention time was identified in the anaerobic reactor, the removal of heavy metals was analyzed by the Fenton process and nanosilica absorbent in leachate treatment. In the primary anaerobic reactor, the highest and lowest removal rates were 59 and 39% for Ni and Cu, respectively. In the Fenton process with optimal H2O2/Fe+2 ratio, Cu and Hg showed the lowest and highest removal rates of 22.4 and 54.54%, respectively. At the optimal rate of nanosilica absorbent and the retention time of 15 min, As was removed maximally with an efficiency of 38% and Cu was removed minimally. The results revealed that the integration of the anaerobic process with the Fenton process and nanosilica absorbent was very effective in removing heavy metals from the aged landfill leachate.

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High-Rate Anaerobic Digestion of Waste Activated Sludge by Integration of Electro-Fenton Process

Cited by 19 publications

References 42 publications

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Fenton oxidation as pretreatment for biomass gasification condensate: cost and biomass inhibition evaluation

The Removal of Heavy Metals from the Leachate of Aged Landfill: The Application of the Fenton Process and Nanosilica Absorbent

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