半连续式与序批式餐厨垃圾与猪粪混合厌氧消化试验研究
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摘要
本论文选取餐饮场所的餐厨垃圾为对象,接种物猪粪取自成都市郊区一养殖户,在不同有机负荷条件下,将餐厨垃圾与猪粪混合进行中温厌氧消化,分别采用半连续与序批式进料方式。
在中温35℃条件下,对厨余垃圾与猪粪进行混合厌氧消化试验,采用半连续式进料方式,逐渐提高加入物料的有机负荷率。结果表明：在0.5gVS/L.d和0.75gVS/L.d有机负荷条件下,混合厌氧消化系统所产生的VFA与氨氮,能够使系统的酸碱度(pH值)维持在有利于产甲烷细菌的生长和繁殖的范围内。甲烷含量可稳定在48%-57%范围内,甲烷含量最大值可达60.28%。甲烷产率与日产气量表现趋势一致,甲烷产率最高可达483 mL.VSg-1.d-1。整个厌氧消化系统产酸到产甲烷阶段的微生物的消长与生化反应均能达到动态平衡。
在中温35℃条件下,对厨余垃圾与猪粪进行混合厌氧消化试验,按照有机负荷为0.5 gVS/L.d,采用序批式填料方式,总共运行61天。结果表明：序批式厌氧消化试验过程中pH由最初的7.1下降到6.5,然后又逐渐回升至7.0；VFA含量最高达到8160mg/L,随着反应的进行,VFA逐渐被转化成CH4和CO2等物质排出,使系统内的酸性物质得到降解,系统产气恢复正常,日产气量在试验的第45天达再次达到峰值5570mL/d,最高甲烷含量为68.9245%；甲烷产率为323mL/gVS,累计产气量为116366 mL由此可见,在0.5 gVS/L.d有机负荷条件下,序批式混合厌氧消化反应经过水解酸化阶段后,能够顺利进入到产甲烷阶段,使消化系统运行稳定。
In this thesis, studies semi-continous and sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃. Selected targeted inoculum pig waste from the outskirts of Chengdu.
A semi-continous anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃to The test was gradually increased on the organic loading rate. The results show that the VFA and ammonia produced could maintain the pH in a certain range, which could help methanogenic bacteria growth and reproduction with the organic load of 0.5gVS/L.d and 0.75gVS/L.d. The methane content could be stabilized at 48%-57%, and the maximum value could reach 60.28%. The methane production rate and the performance of daily gas production rate were in the consistent, and the maximum methane production rates could be reached by 483 mL.VSg-1.d-1 The process from producing of the organic acid to the methanogenic phase could be reached a dynamic equilibrium.
A sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃with the organic load of 0.5gVS/L.d, running a total of 61 days. The results show that the pH from the initial 7.1 dropped to 6.5, and then gradually rose to 7.0; The VFA content up to 8160mg/L and VFA was gradually transformed into CH4 and CO2 and other substances discharged with the reaction,, so that the acidity of a substance within the system degradation, system gas production back to normal, daily gas production reachde to peak 5570 mL.d-1, the maximum methane content of 68.9245%; the maximum methane production rates could be reached by 323 mL.VSg-1.d-1,and the cumulative gas production for the 116366 mL. Thus, the sequencing batch reaction mixture of anaerobic digestion phase after hydrolysis acidification and smoothly into the methane production phase with the organic load of 0.5gVS/L.d, so that the digestive system running stable.
在中温35℃条件下,对厨余垃圾与猪粪进行混合厌氧消化试验,采用半连续式进料方式,逐渐提高加入物料的有机负荷率。结果表明：在0.5gVS/L.d和0.75gVS/L.d有机负荷条件下,混合厌氧消化系统所产生的VFA与氨氮,能够使系统的酸碱度(pH值)维持在有利于产甲烷细菌的生长和繁殖的范围内。甲烷含量可稳定在48%-57%范围内,甲烷含量最大值可达60.28%。甲烷产率与日产气量表现趋势一致,甲烷产率最高可达483 mL.VSg-1.d-1。整个厌氧消化系统产酸到产甲烷阶段的微生物的消长与生化反应均能达到动态平衡。
在中温35℃条件下,对厨余垃圾与猪粪进行混合厌氧消化试验,按照有机负荷为0.5 gVS/L.d,采用序批式填料方式,总共运行61天。结果表明：序批式厌氧消化试验过程中pH由最初的7.1下降到6.5,然后又逐渐回升至7.0；VFA含量最高达到8160mg/L,随着反应的进行,VFA逐渐被转化成CH4和CO2等物质排出,使系统内的酸性物质得到降解,系统产气恢复正常,日产气量在试验的第45天达再次达到峰值5570mL/d,最高甲烷含量为68.9245%；甲烷产率为323mL/gVS,累计产气量为116366 mL由此可见,在0.5 gVS/L.d有机负荷条件下,序批式混合厌氧消化反应经过水解酸化阶段后,能够顺利进入到产甲烷阶段,使消化系统运行稳定。
In this thesis, studies semi-continous and sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃. Selected targeted inoculum pig waste from the outskirts of Chengdu.
A semi-continous anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃to The test was gradually increased on the organic loading rate. The results show that the VFA and ammonia produced could maintain the pH in a certain range, which could help methanogenic bacteria growth and reproduction with the organic load of 0.5gVS/L.d and 0.75gVS/L.d. The methane content could be stabilized at 48%-57%, and the maximum value could reach 60.28%. The methane production rate and the performance of daily gas production rate were in the consistent, and the maximum methane production rates could be reached by 483 mL.VSg-1.d-1 The process from producing of the organic acid to the methanogenic phase could be reached a dynamic equilibrium.
A sequencing batch anaerobic co-digestion with the kitchen waste and pig waste at the temperature of 35℃with the organic load of 0.5gVS/L.d, running a total of 61 days. The results show that the pH from the initial 7.1 dropped to 6.5, and then gradually rose to 7.0; The VFA content up to 8160mg/L and VFA was gradually transformed into CH4 and CO2 and other substances discharged with the reaction,, so that the acidity of a substance within the system degradation, system gas production back to normal, daily gas production reachde to peak 5570 mL.d-1, the maximum methane content of 68.9245%; the maximum methane production rates could be reached by 323 mL.VSg-1.d-1,and the cumulative gas production for the 116366 mL. Thus, the sequencing batch reaction mixture of anaerobic digestion phase after hydrolysis acidification and smoothly into the methane production phase with the organic load of 0.5gVS/L.d, so that the digestive system running stable.
引文
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