物料比对木薯渣与污泥干式厌氧共发酵产沼气的影响

EFFECT OF MIXING RATIO ON BIOGAS PRODUCED BY DRY ANAEROBIC CO-DIGESTION OF CASSAVA DREGS AND SEWAGE SLUDGE

干式厌氧发酵处理固体有机物废弃物技术具有沼气产率高、无沼液处理和运行成本低的优势,但目前关于木薯渣的干式厌氧发酵工艺条件的研究较少。在0.5 L反应器内,分别在TS 15%、TS 20%条件下,进行物料配比为0、10%、20%、40%、100%的木薯渣与污泥的干式厌氧共发酵实验,持续时间42 d,研究总固体和物料比对木薯渣与污泥共发酵产沼气过程的影响。与TS 15%处理相比,TS 20%处理具有较高的日产气量。随着木薯渣比例的增加,TS 15%和TS20%处理中,甲烷含量最大值分别为56.14%和65.86%,木薯渣的甲烷比产率均先增加后降低。对于木薯渣和污泥干式厌氧共发酵,TS 15%适宜的物料比为20%~40%,木薯渣所贡献的甲烷比产率为0.245,0.318,0.303,0.097 m3/kg(VS);TS 20%适宜的物料比为10%~40%,木薯渣所贡献的甲烷比产率为0.334,0.434,0.329,0.271 m3/kg(VS)。

Dry anaerobic fermentation of solid organic waste technology has advantages of high methane yield,low operating costs and no biogas fluid processing,but there are few reports of dry anaerobic digestion using cassava dregs as the raw materials. In this study,a 0. 5 liter bioreator ran for 42 d to investigate the effect of total solid（ 15%,20%） and mixing ratio（ 0,10%,20%,40%,100%） on biogas production process of dry anaerobic co-digestion of cassava dregs and sewage sludge.The results showed that： The daily gas production of TS 20% was higher than that of TS 15%; with the increase of the proportion of cassava dregs,the specific methane production yields（ SMP） based on cassava dregs increased and then gradually decreased; the highest methane contents of TS 15% and TS 20% were 56. 14% and 65. 86%,respectively; the optimum mixing ratio range of TS 15% was 20% ~ 40% and SMP were 0. 245,0. 318,0. 303,0. 097 m^3/kg（ VS）; the optimum mixing ratio range of TS 20% was 10% ~ 40% and SMP were 0. 334,0. 434,0. 329,0. 271 m^3/kg（ VS）.