González-Fernández Cristina, León-Cofreces Cristina, García-Encina Pedro A
Department of Chemical Engineering and Environmental Technology, University of Valladolid, Valladolid, Spain.
Bioresour Technol. 2008 Dec;99(18):8710-4. doi: 10.1016/j.biortech.2008.04.020. Epub 2008 Jun 4.
The effect of three methods (mechanical, chemical, and thermal pretreatment) were tested to improve methane production and anaerobic biodegradability of swine wastes. The first experiment was designed to determine the biodegradability enhancement through the separation of liquid and solid matrix by using a 0.25mm pore size screen (mechanical pretreatment). The second approach was the treatment of swine waste by the addition of a flocculant agent and strong chemicals such as acid (HCl) and alkali (NaOH). The third pretreatment studied was thermal application (170 degrees C provided by vapor). The soluble COD was increased by 57% and 32% during the pretreatment period with alkali and thermal application, respectively. In addition, these two pretreatments gave the highest enhancement on methane production with regard to the untreated sample. Meanwhile, the addition of a flocculant improved the methane production of the liquid fraction but not the solid one. On the other hand, mechanical pretreatment did not show any important enhancement. Biodegradability percentage followed the same trend as methane productivity.
测试了三种预处理方法（机械法、化学法和热预处理法）对提高猪粪甲烷产量和厌氧生物降解性的效果。第一个实验旨在通过使用孔径为0.25毫米的筛网分离液体和固体基质来确定生物降解性的提高（机械预处理）。第二种方法是通过添加絮凝剂以及强酸（盐酸）和强碱（氢氧化钠）来处理猪粪。研究的第三种预处理方法是热应用（由蒸汽提供170摄氏度）。在预处理期间，碱处理和热应用分别使可溶性化学需氧量（COD）提高了57%和32%。此外，与未处理的样品相比，这两种预处理方法对甲烷产量的提高最为显著。同时，添加絮凝剂提高了液体部分的甲烷产量，但对固体部分没有效果。另一方面，机械预处理没有显示出任何显著的提高。生物降解率与甲烷生产率的趋势相同。
