Anaerobic digestion of saline creeping wild ryegrass for biogas production and pretreatment of particleboard material

• Published in: Bioresource technology Vol. 100; no. 4; pp. 1582 - 1588
• Main Authors: Zheng, Yi, Pan, Zhongli, Zhang, Ruihong, El-Mashad, Hamed M., Pan, Jinming, Jenkins, Bryan M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2009; [New York, NY]: Elsevier Ltd; Elsevier
• Subjects: Anaerobic digestion; Anaerobiosis; Bioelectric Energy Sources; Biofuel production; Biogas; Biological and medical sciences; Biological treatment of sewage sludges and wastes; Biotechnology; carbon dioxide; Creeping wild ryegrass; Energy; Environment and pollution; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Leymus triticoides; lignocellulose; Lolium - metabolism; Mechanical Phenomena; methane; Methane - analysis; organic wastes; Particleboard; particleboards; Saline biomass; Salinity; Sewage; Time Factors; waste treatment; Water - chemistry; Saline biomass; Particleboard; Creeping wild ryegrass; Biogas; Anaerobic digestion; Monocotyledones; Lolium; Biomass; Salinity; Gramineae; Angiospermae; Herbaceous plant; Spermatophyta; Pretreatment
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2008.08.048

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 8419 BTU/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.