Accelerating acidogenic fermentation of sewage sludge with ash addition

Niero, Luisa; Morgan-Sagastume, Fernando; Lagerkvist, Anders

doi:10.1016/j.jece.2021.106564

Cited by 11 publications

(2 citation statements)

References 46 publications

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“…The maximal SCFA concentration obtained is higher than the values reported in the literature for the municipal sludge (primary, secondary, or mixture) [31][32][33][34].…”

Section: Production Of Scfas Over Timecontrasting

confidence: 73%

“…Since the literature is scarcely furnished with data related to SCFAs from tannery sludge, a reasonable comparison can be assessed with municipal sludge-related experiments. Different authors highlighted that SCFA concentration can be higher under mesophilic conditions and with a longer retention time, with an optimal pH for the acidogenic fermentation between 7.0 and 8.0 [31,32]; under the thermophilic condition, the sludge acidogenesis is usually less performing, showing that the available COD SOL remained not converted into SCFAs. Hydrolysis has also been identified as an important step, applied as the hyperthermophilic treatment (70 • C, 24-48 h) for the solubilization of the organics and the increase of their biodegradability [31,32]; in addition, increasing the initial pH had an overall positive effect on the hydrolysis [29].…”

Section: Production Of Scfas Over Timementioning

confidence: 99%

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Microwave-Hydrogen Peroxide Assisted Anaerobic Treatment as an Effective Method for Short-Chain Fatty Acids Production from Tannery Sludge

et al. 2022

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Tannery sludge is disposed of in landfills as it is considered a special residue by the Italian legislation, creating pollution and waste. This paper aims at evaluating the performance of the anaerobic fermentation process to obtain short-chain fatty acids (SCFAs) from this waste. The assessment of the most appropriate conditions, in terms of pH, temperature, initial total solids (TSs) content, and application of oxidizing-thermal pretreatment has been developed. The batch test trials revealed that the combined microwave and hydrogen peroxide (MW-H2O2) pretreatment followed by thermophilic conditions gave the best results, in terms of the acidification yield (0.31 gCODSCFA/gVS0) and maximal SCFA concentration (above 26 g CODSCFA/L). In the tests conducted without pretreatment, the mesophilic temperature should be preferred since the acidification performances were comparable to or even better than their thermophilic counterparts. The SCFA composition analysis showed that in mesophilic fermentation, tannery sludge can generate up to 50% acetic acid (CODAc/CODSCFA), if previously pretreated (MW-H2O2). This research acts as a forerunner for the appropriate handling of this resource, to employ it for the development of a new tannery industry focused on a circular approach, rather than to simply dispose of it in landfills.

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“…The maximal SCFA concentration obtained is higher than the values reported in the literature for the municipal sludge (primary, secondary, or mixture) [31][32][33][34].…”

Section: Production Of Scfas Over Timecontrasting

confidence: 73%