4.8 Article

Agricultural wastes co-densification: A solution for seasonal feedstock storage and anaerobic digestion performance improvement

Journal

BIORESOURCE TECHNOLOGY
Volume 346, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126345

Keywords

Pelletization; Storage characteristic; Flexible feedstock; Net biogas yield; Feedstock supply

Funding

  1. Funda-mental Research Funds for Central Non-profit Scientific Institution [1610132020003]
  2. Comprehensive Construction Project on Rural Energy of Ministry of Agriculture and Rural Affairs
  3. Excellent Young Talent Program of IARRP, CAAS
  4. International Clean Energy Talent Program of China Scholarship Council [201902720026]
  5. Agricultural Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences [CAAS-ASTIP-2016-BIOMA]

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Rice straw and pig manure pellets, as well as sorghum straw and pig manure pellets, had minimal changes in characteristics during one-year indoor storage, with relatively high biogas yields. Co-densified biomass digestion improved biodegradability and increased biogas production. Considering volatile matter loss and decline in biogas yield, co-densified rice straw and pig manure pellets had a higher net biogas yield compared to rice straw.
Rice straw and pig manure pellets (RPP) and sorghum straw and pig manure pellets (SPP) were used to identify their competition as the flexible feedstock of anaerobic digestion with one-year indoor storage. The results indicated the effect of time on their characteristic was tiny during storage period, such as density, calorific value, total solid, volatile solid, ratio of carbon and nitrogen, and lignocellulosic components. Biogas yields of stored RPP and SPP were 8.8% and 26.7% lower than that of fresh pig manure (PM), and 45.4% and 56.1% higher than the sum of corresponding straw and PM digestion alone, respectively. Improvements in biodegradability were observed in co-densified biomass anaerobic digestion. Net biogas yield of RPP was 24.2% higher than that of rice straw, considering volatile matter loss and biogas yield decline during densification and storage stage. Priority of manure and supplement of co-densified biomass were proposed for feedstock supply on demand.

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