4.5 Article

Biomethane Potential of Selected Organic Waste and Sewage Sludge at Different Temperature Regimes

Journal

ENERGIES
Volume 14, Issue 14, Pages -

Publisher

MDPI
DOI: 10.3390/en14144217

Keywords

co-digestion; sewage sludge; grease trap sludge; organic fraction of municipal sewage waste; specific cumulative methane production; algae biomass; biochemical methane potential assay; anaerobic digestion

Categories

Funding

  1. Czestochowa University of Technology, Faculty of Infrastructure and Environment [BS/PB-400/301/21]
  2. EnviSafeBioC project by Polish National Agency for Academic Exchange NAWA [PPI/APM/2018/1/00029/U/001]

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The co-digestion of sewage sludge with grease trap sludge, organic fraction of municipal sewage waste, and algae biomass can enhance biogas production and performance. Results showed that the mixture containing sewage sludge, grease trap sludge, and algae biomass brought the most noticeable improvements in methane yields compared to other mixtures.
Sewage sludge (SS) generation and its management still pose a problem in many countries. Anaerobic co-digestion (AcD) of SS with grease trap sludge (GTS) and organic fraction of municipal sewage waste (OFMSW), which are two easily biodegradable substrates, may improve biogas production and AcD kinetics. Algae biomass (AB) of the species Undaria pinnatifida can be the third co-digestion component that may also affect the AcD performance. The aim of the study was therefore to evaluate the performance of mesophilic and thermophilic SS batch AcD with OFMSW, GTS as well as AB through biochemical methane potential (BMP) assay in relation to cumulative specific biogas (Y-B) and methane yields (Y-m). Three kinetic models were applied within the scope of the kinetic study. Results of the study showed that the mixture containing SS, GTS and AB brought the most noticeable improvements in Y-m compared to other studied mixtures and in respect to standalone SS digestion, the improvement amounted to 88.37% at mesophilic temperature (260.83 +/- 15.02 N mL CH4/g-VSadd and for standalone SS 138.47 +/- 4.70 N mL CH4/g-VSadd) and 71.09%, respectively, at the thermophilic one (275.66 +/- 4.11 N mL-CH4/g-VSadd and for SS standalone 161.13 +/- 13.11 N mL-CH4/g-VSadd).

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