Enhanced dry anaerobic digestion of swine excreta after organic nitrogen being recovered as soluble proteins and amino acids using hydrothermal technology
2018
Huang, Weiwei | Zhao, Ziwen | Tian, Yuan | Yu, Yang | Huang, Wenli | Lei, Zhongfang | Zhang, Zhenya
This study investigated the feasibility of N recovery from swine excreta (SE) as value-added soluble proteins and amino acids using hydrothermal (HT) technology for improving dry anaerobic digestion (AD) performance. The effect of temperature on characteristics and transformation behaviors of N species in SE subjected to HT pretreatment at different temperatures (110–210 °C for holding 30 min) was investigated. After HT pretreatment at 150 °C, 58% of the total nitrogen (TN) content in SE became soluble, with 19.03%, 1.55% and 0.56% of TN being converted into soluble proteins, amino acids and urea, respectively. Temperatures higher than 170 °C favored the breakdown of these proteinaceous compounds, leading to accelerated formation of ammonia. After soluble proteins and amino acids being separated by water extraction, CH4 yield (322.13 cm3 g−1 of VSfed) from the solid residue pretreated at 150 °C was improved by 51% in comparison to that from raw excreta (213.70 cm3 g−1 of VSfed), achieving 3 days' shorter in effective CH4 production period. HT technology could be an effective pretreatment alternative for the recovery of soluble proteins and amino acids and subsequently enhanced dry AD of SE.
Mostrar más [+] Menos [-]Palabras clave de AGROVOC
Información bibliográfica
Este registro bibliográfico ha sido proporcionado por National Agricultural Library