Rincón B, Bujalance L, Fermoso F G, Martín A, Borja R
Instituto de la Grasa (CSIC), Avenida Padre García Tejero, 4.41012 Sevilla, Spain.
Departamento de Ingeniería Química y Química Inorgánica, Facultad de Ciencias, Universidad de Córdoba, Campus Universitario de Rabanales, Edificio C-3, Carretera Madrid-Cádiz, km 396, 14071 Córdoba, Spain.
ScientificWorldJournal. 2014;2014:648624. doi: 10.1155/2014/648624. Epub 2014 Aug 12.
The effect of ultrasound (US) pretreatment on two-phase olive mil solid waste (OMSW) composition and subsequent anaerobic biodegradation was evaluated by chemical oxygen demand solubilization and biochemical methane potential (BMP) tests. OMSW was ultrasonically pretreated at a power of 200 W and frequency of 24 kHz for time periods of 20, 40, 60, 90, 120, and 180 minutes, corresponding to specific energies of 11367, 21121, 34072, 51284, 68557, and 106003 kJ/kg total solids, respectively. In order to evaluate the US pretreatment, a low, medium, and high exposure time, that is, 20, 90, and 180 min, were selected for BMP tests. Methane yields of 311 ± 15, 393 ± 14, and 370 ± 20 mL CH₄/g VSadded (VS: volatile solids) were obtained for 20, 90, and 180 minutes, respectively, while the untreated OMSW gave 373 ± 4 mL CH₄/g VSadded. From a kinetic point of view, the BMP tests showed a first exponential stage and a second sigmoidal stage. In the first stage, the kinetic constant obtained for US pretreated OMSW at 20 minutes was 46% higher than those achieved for the pretreated OMSW at 90 and 180 minutes and 48% higher than that for untreated OMSW. The maximum methane production rate achieved was 12% higher than that obtained for untreated OMSW.
通过化学需氧量溶解和生化甲烷潜力（BMP）测试，评估了超声（US）预处理对两相橄榄渣固体废弃物（OMSW）成分及后续厌氧生物降解的影响。在功率为200 W、频率为24 kHz的条件下，对OMSW进行超声预处理，处理时间分别为20、40、60、90、120和180分钟，相应的比能量分别为11367、21121、34072、51284、68557和106003 kJ/kg总固体。为了评估超声预处理效果，在BMP测试中选择了低、中、高暴露时间，即20、90和180分钟。20、90和180分钟处理时间的甲烷产量分别为311±15、393±14和370±20 mL CH₄/g添加挥发性固体（VS），而未处理的OMSW的甲烷产量为373±4 mL CH₄/g添加挥发性固体。从动力学角度来看，BMP测试显示出一个第一指数阶段和一个第二S形阶段。在第一阶段，20分钟超声预处理的OMSW获得的动力学常数比90分钟和180分钟预处理的OMSW高46%，比未处理的OMSW高48%。实现的最大甲烷生产率比未处理的OMSW高12%。
