Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, China.
Bioresour Technol. 2010 Jun;101(12):4343-8. doi: 10.1016/j.biortech.2010.01.083. Epub 2010 Feb 11.
Rice straw particles were directly used as substrate for anaerobic digestion with acclimated sludge under room temperature and different levels of phosphate. Two obvious biogas production peaks were observed for all reactors, with biogas or methane yields of (0.33-0.35)m(3)/kg-VS loaded or (0.27-0.29)m(3) CH(4)/kg-VS loaded and average methane contents of 75.9-78.2%. A separated two-stage first-order kinetic model was developed in this study and showed a good fit to the experimental data when this complicated process was divided into two stages. The average biogas and methane production rate constants were (0.027-0.031)d(-1) and (0.028-0.033)d(-1), respectively, increased by 2-3 times in the second stages than those in the first. The results indicated that an adequate level of phosphate addition (465 mg-P/L) could accelerate the biogasification process: 7-13 days earlier appearance of the two peaks and shorter time needed for complete biogasification of rice straw.
稻草颗粒在室温条件下，用驯化的污泥作为底物进行厌氧消化，并添加不同水平的磷酸盐。所有反应器都观察到了两个明显的沼气产生高峰，沼气或甲烷产率为（0.33-0.35）m3/kg-VS 加载或（0.27-0.29）m3 CH4/kg-VS 加载，平均甲烷含量为 75.9-78.2%。本研究建立了一个分离的两段式一级动力学模型，当将这个复杂的过程分为两个阶段时，该模型与实验数据拟合得很好。平均沼气和甲烷产率常数分别为（0.027-0.031）d-1 和（0.028-0.033）d-1，第二阶段的产率常数比第一阶段增加了 2-3 倍。结果表明，适量的磷酸盐添加（465mg-P/L）可以加速沼气化过程：两个高峰的出现提前了 7-13 天，完成稻草沼气化所需的时间也缩短了。
