【作者】 蒋琼华；

【导师】 张文阳；

【作者基本信息】 西南交通大学 ， 环境工程， 2013， 硕士

【摘要】 泔脚废油脂再生能源化是目前国内外较少涉足的研究领域。本试验选取泔脚废油脂作为实验材料,利用猪粪作为接种物在中温(35℃)条件下进行不同有机负荷厌氧消化试验。试验将废油脂与猪粪混合于CSTR反应器中,采用半连续运行方式。本试验通过监测分析系统的pH值、挥发性脂肪酸(VFA)、氨氮、碱度、产气量以及气体组分等参数,研究了泔脚废油脂的厌氧消化规律,寻求废油脂厌氧消化的极限负荷。试验表明：(1)先将猪粪添加到自制的CSTR反应器中进行驯化,驯化成功后再将泔脚废油脂加入系统中进行厌氧消化试验,细菌很快适应环境,系统水解酸化和产甲烷过程能有序进行,并表现出良好的运行状况,废油脂能得到有效降解。(2)随着有机负荷逐步从0.5gVS/(L.d).0.75gVS/(L.d)、1.0gVS/(L.d)升高到1.25gVS/(L.d)时,pH值、VFA浓度、碱度和氨氮分别保持在7.3、450mg／L、9500mg／L和1100mg／L左右。累计产气量和产气率不断增加,产气量分别为90.21L、136.24L、196、64L,平均产气率分别为1.36L/gVS、1.4L/gVS、1.5L/gVS。各项指标表明,低有机负荷环境适合微生物的生长代谢,系统处于稳定状态。在有机负荷为1.25gVS/(L.d)时条件下运行效果最佳,产气量稳定,最大日产气量为17.6L,平均产气率最大为1.78L/gVS,甲烷百分含量为60%。(3)当系统在高有机负荷条件下运行时,pH值不断下降,在有机负荷为1.5gVS/(L.d)时,pH值下降到7.1左右,当有机负荷达到1.75gVS/(L.d)时,pH值从7.0下降到了6.6,VFA浓度从809mg／L升高到3697mg／L,产气量减少到167.6L,系统甲烷化受到抑制,甲烷百分含量降低到10%,甚至更低。(4)泔脚废油脂的产甲烷能力比一般泔脚垃圾强,但是废油脂的厌氧消化更易产生酸抑制,因此,试验要求的厌氧消化系统应该有更高的耐废油脂类有机负荷能力。更多还原

【Abstract】 Hogwash waste grease renewable energy technology was less involved at home and abroad.The anaerobic digestion experiment was processed with different organic loading at35℃.The test selected waste grease of the hogwash as the experimental materials and pig manure as inoculum,which mixed in a CSTR reactor with an adopted semi-continuous operation mode. The experiment studied the anaerobic digestion regularity and the limiting organic load of hogwash waste grease, by monitoring and analyzing the pH value, volatile fatty acid (VFA), ammonia nitrogen, alkalinity, gas production and gas composition. The results indicated that:(1) The bacterial got high adaptability to the reacting environment when adding the pig manure to the self-made CSTR reactor for acclimatization,and then putting the hogwash waste grease to the system affter a succesfully domestication.The hydrolysis acidification and methanogenic process run orderly.The whole system went well, and the grease could be degraded effectively.(2) When the organic load gradually increased from0.5gVS/(L.d),0.75gVS/(L.d),1gVS/(L.d) to1.25gVS/(L.d),the pH, VFA concentration, alkalinity and ammonia nitrogen kept at7.3,450mg/L,9500mg/L and1100mg/L,respectively. The cumulative gas production and gas production rate increased constantly.The gas productions were90.21L,136.24L,196.64L,and the average production rate were1.36L/gVS,1.4L/gVS,1.5L/gVS, respectively. The results showed that low organic loading environment was suitable for microorganism growing and the system remained steady. When the organic load was1.25gVS/(L.d), the system run best and the gas production was stable.The maximum gas production per day was17.6L, the average gas production ratecould reach1.78L/gVS and the content of methane occupied60%of the gas.(3) When the system ran at high organic load,the pH was falling.When the organic load was1.5gVS/(L.d), the pH dropped to7.1, when the organic load reached1.75gVS/(L.d), the pH decreased from7.0to6.6, the VFA concentration increased from809mg/L to3697mg/L,gas production reduced to167.6L, the methanation of the system is inhibited, the content of methane fell to10%or even lower.(4) The methane generating ability of hogwash waste grease is better than the common food residue.However the anaerobic digestion of waste grease was more likely to appear acid inhibition, therefore, the anaerobic digestion system of this test required a higher organic load resistance to the waste grease.更多还原