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Anaerobic Digestion of Cattle Manure Influenced by Swirling Jet Induced Hydrodynamic Cavitation

TitoloAnaerobic Digestion of Cattle Manure Influenced by Swirling Jet Induced Hydrodynamic Cavitation
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2018
AutoriLangone, Michela, Soldano M., Fabbri C., Pirozzi F., and Andreottola G.
RivistaApplied Biochemistry and Biotechnology
Volume184
Paginazione1200-1218
ISSN02732289
Parole chiaveAmmonia, Ammonia stripping, Anaerobic biodegradability, Anaerobic digestion, anaerobic growth, Anaerobiosis, animal, Animals, article, biodegradability, bovine, carbon, Cattle, Cattle manures, Cavitation, chemical phenomena, Energy balance, Fertilizers, hydrodynamic cavitation, Hydrodynamic cavitations, hydrodynamics, Hydrogen-Ion Concentration, manure, Manures, methane, microbiology, Mixing, Nitrogen, nonhuman, Operational practices, organic matter, Organic matter solubilizations, organic nitrogen, particle size, pH, pressure, Refractory compounds, Solubility, solubilization, swirling jet, Total Kjeldahl nitrogens, Viscosity
Abstract

In this work, a modified swirling jet-induced cavitation has been employed for increasing anaerobic digestion efficiency of cattle manure. The hydrodynamic cavitation (HC) treatment improved the organic matter solubilization and the anaerobic biodegradability of cattle manure. The degree of disintegration increased by 5.8, 8.9, and 15.8% after the HC treatment at 6.0, 7.0, and 8.0 bars, respectively. However, the HC treatment at 7.0 bars had better results in terms of methane production. This result may be attributed to the possible formation of toxic and refractory compounds at higher inlet pressures, which could inhibit the methanization process. Further, total Kjeldahl nitrogen content was found to decrease with increasing inlet pressures, as the pH and the turbulent mixing favored the ammonia stripping processes. HC treatment decreased the viscosity of the treated cattle manure, favoring the manure pumping and mixing. Considerations on the energy input due to the HC pre-treatment and the energy output due to the enhanced methane yield have been presented. A positive energy balance can be obtained looking at the improved operational practices in the anaerobic digesters after the implementation of the HC pre-treatment. © 2017, Springer Science+Business Media, LLC.

Note

cited By 7

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85030308987&doi=10.1007%2fs12010-017-2612-3&partnerID=40&md5=ef3a8404098484aa051aef4b01099d69
DOI10.1007/s12010-017-2612-3
Citation KeyLangone20181200