Mature Landfill Leachate as a Medium for Hydrodynamic Cavitation of Brewery Spent Grain

Magdalena Lebiocka, Agnieszka Montusiewicz, Sylwia Pasieczna-Patkowska and Sławomir Gułkowski
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Magdalena Lebiocka: Faculty of Environmental Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland
Agnieszka Montusiewicz: Faculty of Environmental Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland
Sylwia Pasieczna-Patkowska: Faculty of Chemistry, Institute of Chemical Sciences, Department of Chemical Technology, Maria Curie Skłodowska University, Pl. Marii Curie-Skłodowskiej 3, 20-031 Lublin, Poland
Sławomir Gułkowski: Faculty of Environmental Engineering, Lublin University of Technology, Nadbystrzycka 40B, 20-618 Lublin, Poland

Energies, 2021, vol. 14, issue 4, 1-14

Abstract: In this study, we evaluate the usefulness of mature landfill leachate (MLL) as a carrier allowing hydrodynamic cavitation (HD) of brewery spent grain (BSG). The HD experiments were conducted using an orifice plate with a conical concentric hole of 3/10 mm (inlet/outlet diameter) as a constriction in the cavitation device. The initial pressure was 7 bar and the number of recirculation passes through the cavitation zone reached 30. The results showed that complex organic matter was degraded and solubilized when cavitating the MLL and BSG mixture. The biochemical oxygen demand (BOD 5 ) increased by 45% and the BOD 5 /total chemical oxygen demand (COD) ratio increased by 69%, whereas the COD, total solids, and nutrient concentration dropped noticeably. However, Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) revealed the generation of possibly toxic HD byproducts such as aromatic compounds. This seems to indicate that MLL could not be regarded as a suitable carrier for BSG cavitation.

Keywords: hydrodynamic cavitation; brewery spent grain; mature landfill leachate; SEM analysis; FTIR-PAS (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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