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Abstract
The objective of this research was to develop an integrated process to produce biogas
and high-quality particleboard using saline creeping wild ryegrass (CWR), Leymus triticoides
through anaerobic digestion (AD). Besides producing biogas, AD also serves as a pretreatment
method to remove the wax layer of CWR for improving binding capability and then the
residue is used to produce high-quality particleboard. CWR was digested for three
time periods, 15, 22, and 33 days with the volatile solid (VS) loading of 10 g-VS/L-sludge
and the food to microorganism (F/M) ratio of 1.41. The highest biogas yield after
digestion for 33 days was 251 mL/g-VS, which is corresponded to energy of 8419BTU/kg-dry
CWR. The highest methane content of biogas was 63%. Compared with particleboards manufactured
from urea formaldehyde (UF) and untreated CWR, the mechanical and long-term (24 h)
water resistance properties of particleboards made from UF and 33-day AD CWR residue
were statistically significantly improved, except for modulus of elasticity (MOE).
For example, the modulus of rupture (MOR) was increased by 39%. The results indicated
that the integrated process could be a cost-effective and environmentally friendly
method for producing bioenergy and particleboard with agricultural residues.