The management of animal by-products (ABP) is a crucial issue since the relevant economic and environmental consequences that this practice involves. A relevant sector in which AD is currently fully implemented is the wastewater treatment plant (WWTP) in EU and particularly in Italy, however, the organic loading at which these digesters are low due to over-designed digesters. In this study, the addition of ABP as a co-substrate that could complete WWTP capacity and increase the efficiency of biogas production was tested in a batch mode. 4 ratios of 0, 20, 40 and 60% (w/w) of the total stream of ABP to sewage sludge were investigated in 4% TS. The best results were achieved by adding 40% ABP to sewage sludge which led to 70% increase in methane yield whit 736.4 L/kgVS biomethane yield, 71.4% CH4, and 36.7% VS removal. Also, the effective time to produce 90% of methane was approximately 13 days, while this time for SS was 16.2 days. These results proved incorporation of ABP with SS in existing infrastructure of WWTP can improved main challenges of single AD of sewage sludge comprising slow AD and low volatile solid removal and mitigate technical problems and risks of slaughterhouse waste AD.
Anaerobic co-digestion of sewage sludge and animal by-product
Francesco Di Maria
Conceptualization
;
2018
Abstract
The management of animal by-products (ABP) is a crucial issue since the relevant economic and environmental consequences that this practice involves. A relevant sector in which AD is currently fully implemented is the wastewater treatment plant (WWTP) in EU and particularly in Italy, however, the organic loading at which these digesters are low due to over-designed digesters. In this study, the addition of ABP as a co-substrate that could complete WWTP capacity and increase the efficiency of biogas production was tested in a batch mode. 4 ratios of 0, 20, 40 and 60% (w/w) of the total stream of ABP to sewage sludge were investigated in 4% TS. The best results were achieved by adding 40% ABP to sewage sludge which led to 70% increase in methane yield whit 736.4 L/kgVS biomethane yield, 71.4% CH4, and 36.7% VS removal. Also, the effective time to produce 90% of methane was approximately 13 days, while this time for SS was 16.2 days. These results proved incorporation of ABP with SS in existing infrastructure of WWTP can improved main challenges of single AD of sewage sludge comprising slow AD and low volatile solid removal and mitigate technical problems and risks of slaughterhouse waste AD.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
