Benefits of supplementing an industrial waste anaerobic digester with energy crops for increased biogas production.

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Benefits of supplementing an industrial waste anaerobic digester with energy crops for increased biogas production. / Ivo Achu, Nges; Escobar, Federico; Fu, Xinmei; Björnsson, Lovisa.

I: Waste Management: international journal of integrated waste management, science and technology , Vol. 32, Nr. 1, 2012, s. 53-59.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Benefits of supplementing an industrial waste anaerobic digester with energy crops for increased biogas production.

AU - Ivo Achu, Nges

AU - Escobar, Federico

AU - Fu, Xinmei

AU - Björnsson, Lovisa

PY - 2012

Y1 - 2012

N2 - Currently, there is increasing competition for waste as feedstock for the growing number of biogas plants. This has led to fluctuation in feedstock supply and biogas plants being operated below maximum capacity. The feasibility of supplementing a protein/lipid-rich industrial waste (pig manure, slaughterhouse waste, food processing and poultry waste) mesophilic anaerobic digester with carbohydrate-rich energy crops (hemp, maize and triticale) was therefore studied in laboratory scale batch and continuous stirred tank reactors (CSTR) with a view to scale-up to a commercial biogas process. Co-digesting industrial waste and crops led to significant improvement in methane yield per ton of feedstock and carbon-to-nitrogen ratio as compared to digestion of the industrial waste alone. Biogas production from crops in combination with industrial waste also avoids the need for micronutrients normally required in crop digestion. The batch co-digestion methane yields were used to predict co-digestion methane yield in full scale operation. This was done based on the ratio of methane yields observed for laboratory batch and CSTR experiments compared to full scale CSTR digestion of industrial waste. The economy of crop-based biogas production is limited under Swedish conditions; therefore, adding crops to existing industrial waste digestion could be a viable alternative to ensure a constant/reliable supply of feedstock to the anaerobic digester.

AB - Currently, there is increasing competition for waste as feedstock for the growing number of biogas plants. This has led to fluctuation in feedstock supply and biogas plants being operated below maximum capacity. The feasibility of supplementing a protein/lipid-rich industrial waste (pig manure, slaughterhouse waste, food processing and poultry waste) mesophilic anaerobic digester with carbohydrate-rich energy crops (hemp, maize and triticale) was therefore studied in laboratory scale batch and continuous stirred tank reactors (CSTR) with a view to scale-up to a commercial biogas process. Co-digesting industrial waste and crops led to significant improvement in methane yield per ton of feedstock and carbon-to-nitrogen ratio as compared to digestion of the industrial waste alone. Biogas production from crops in combination with industrial waste also avoids the need for micronutrients normally required in crop digestion. The batch co-digestion methane yields were used to predict co-digestion methane yield in full scale operation. This was done based on the ratio of methane yields observed for laboratory batch and CSTR experiments compared to full scale CSTR digestion of industrial waste. The economy of crop-based biogas production is limited under Swedish conditions; therefore, adding crops to existing industrial waste digestion could be a viable alternative to ensure a constant/reliable supply of feedstock to the anaerobic digester.

KW - Co-digestion

KW - Anaerobic digestion

KW - Energy crops

KW - Industrial waste

KW - Micronutrients

KW - Methane yield

KW - C:N ratio

U2 - 10.1016/j.wasman.2011.09.009

DO - 10.1016/j.wasman.2011.09.009

M3 - Article

VL - 32

SP - 53

EP - 59

JO - Waste Management: international journal of integrated waste management, science and technology

T2 - Waste Management: international journal of integrated waste management, science and technology

JF - Waste Management: international journal of integrated waste management, science and technology

SN - 0956-053X

IS - 1

ER -