摘要
采用经热(80℃,15 min)预处理的城市生活垃圾厌氧消化污泥为接种物,考察了在600 W、4 min微波预处理条件下,餐厨垃圾中温批式发酵产氢中比产氢率与pH值的关系。结果表明:餐厨垃圾发酵产氢的延迟时间λ、最大比产氢率、产氢率、生物气中氢气的最高体积分数分别为4.03 h、18.58 mL/(gVS.h)、254.89 mL/gVS、54.6%,具有较高的产氢能力;在餐厨垃圾的发酵产氢体系中,pH值与比产氢率之间存在着非常密切的关系。随着餐厨垃圾发酵酸化的进行(pH值降低),同一时刻与之相对应的比产氢率先增大,而后逐渐变小。根据发酵过程中比产氢率与pH值的变化及pH模型,求得动力学常数Rmax、KH、KOH的值分别为21.9 mL/(gVS.h)、1.63×10-5mo1/L和1.45×10-6mol/L(回归系数为0.773 0),并求得餐厨垃圾连续发酵产氢的最佳pH值为5.31。
The batch fermentative hydrogen production at 36℃ from food residues with preheated anaerobic digested sludge at 80℃ was studied, and the relation between specific hydrogen rate（SHR） and pH value of hydrogen production with microwave pretreatment time of 4 minutes at 600W was investigated. The results show that： The lag-phase time（A） , the maximal specific hydrogen rate, the specific hydrogen potential and the hydrogen contents of biogas for FR were 4.03 h, 18.58 mL/（gVS · h） , 254.89 mL/gVS, and 54.6% v/v respectively, which exceed literature results; In the system of fermentative hydrogen production, there are extraordinary connection between the SHR and pH value. According to the transformation of the SHR and pH value, the kinetic constants of pH model by regression are respectively Rmax（21.9 mL/（gVS · h））, Kn （1.63 × 10-5 moL/L） and KOH （1. 45 × 10-6 mol/L）. Therefore, pH value at 5.31 is the optimal pH value of continuous fermentative hydro-gen production for food residue.
出处
《重庆理工大学学报（自然科学）》
CAS
2013年第6期48-52,共5页
Journal of Chongqing University of Technology：Natural Science
关键词
厌氧消化污泥
餐厨垃圾
批式发酵产氢
比产氢率
PH值
anaerobic digested sludge
food residues
batch fermentative hydrogen production
specific hydrogen rate
pH value
